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- - By Pia (****) [ru] Date 2011-12-03 09:36
Help!
I have Intel Core Q6600 @ 2400 CPU and G31/33 motherboard (ASRock).
How to overclock it? I heard it can be (easily) overclocked to 4 GHz!
I can't change CPU multiplier (9x) and if try to overclock higher than @ 2600 it all hang up!
Suggestions?
Parent - By BigBen (****) Date 2011-12-04 08:08
Hi,
   This can be a problem with multiplier locked CPUs because once at your maximum multiplier you can only use what I still call the FSB (front side bus) which means you speed up the motherboard, memory and even the chipsets.

Now either your motherboard or memory cannot take the speed increase, there may be an option in the BIOS to alter the memory speed if that is the problem, once that is slowed down you may be able to increase the motherboard speed (it speeds up the cpu as well) further but note that this once agin tends to start an increase in memory speed.

I would start with keeping the memory at its normal speed all the time until you can establish the fastest speed for your motherboard, then you will know what the bottle neck is .... In the BIOS there maybe some multipliers that alters more things but I do not know your motherboard and of course you will have to increase voltages as you crank up the OC.

You may also be able to use this http://www.asrock.com/feature/OCTuner/

Regards
Tony
Parent - By Ray (****) Date 2011-12-04 08:31
A Q6600 cannot be "easily" overclocked to 4GHz. Most top out around 3.6Ghz if you have a good chip, and you want to keep voltages and heat down for long term use.

3Ghz is a nice overclock. FSB increase to 333 from 266, and memory multiplier reduced to keep it in spec. You may or may not need a CPU voltage increase.
Parent - By Sciolto (**) [nl] Date 2012-01-26 23:51
Yes, upgrade
the Q6600 does not have an easy overclock to 4,0 contrary to what you write.
This first generation quad is almost legacy.
A smart investment for a low budget would be a an i5-2500k at this point in time.
Exchanging the mobo + cpu + memory + cooler shouldn't cost you much more than 400 euro and this one can easily be overclocked to above 4,0
I did this upgrade for the slowest computer I had and got 4,7 without any hassle at all. Maybe lucky with the chip running at 58 degrees celcius running prime95 but on average 50% of these chips reach 4,5 without extreme cooling solutions.
- - By cma6 (****) Date 2011-12-12 03:05
I lost my O/C on my ASUS P6T Delux MB using i7-930 chip.
  I was wondering if anyone is familiar with this board for O/C, e.g., how to retrieve store BIOS settings and how to go into Advance mode and set the Vcore, etc.
         Thanks, CMA
Parent - - By cma6 (****) Date 2011-12-12 03:33 Edited 2011-12-12 03:41
Mocha, thanks for the very useful link.
Parent - By mocha1961 (***) [us] Date 2011-12-12 11:59
ur welcome.:cool:
Parent - - By cma6 (****) Date 2011-12-12 16:12 Edited 2011-12-12 18:48
On a preliminary basis, I have achieved an O/C on this MB of 22 X 185 = 4.07 GHz, using Bclk = 185; QPI/DRAM = 1.30625;  Dram Bus (Vdimm) = 1.64;  Vcore = 1.325
   Infinite analysis in various engines does not get about 55 C. My red line is  60 C.
  So heat is not even close to being an issue.
   But unfortunately I've found that when I push Blck (bus speed) to 190 with a needed increase in Vcore, then problems arise quickly (BSOD or reboots, etc.)
   I have never determined if the ASUS P6T Deluxe V2 MB simply cannot achieve an O/C much above 4.07 Ghz; or if I never found the right combination of O/C parameters.
It seems clear that heat is not the issue in limiting my O/C.
Parent - - By CSullivan (**) [us] Date 2011-12-12 19:19 Edited 2011-12-12 19:50
Since the BCLK affects both the cpu and memory [I think], raising the BCLK will eventually fail because your memory is not capable of handling the speed.
Parent - - By cma6 (****) Date 2011-12-12 20:18
An interesting point, Charles. However, since the Multiplier is maxed out at 22 X, raising BCLK is the only way to O/C.
  And aren't there ways to change memory settings to give more leeway for a higher BCLK?
Parent - - By CSullivan (**) [us] Date 2011-12-12 23:59
I think maybe you have reached the limits of your chip's QPI.

http://www.maximumpc.com/article/features/ultimate_core_i7_overclocking_guide_we_push_nehalem_its_limits

With BCLK = 185, your QPI must be able to handle 185 x 36 [the QPI multiplier] = 6.66 GT/s, but the QPI on your chip is only rated at 4.8 GT/s.  Usually you can go past the 4.8 limit, but eventually you hit the wall.

Charles

From the above article:

More About QPI

Another new element to the Core i7 is the Quick Path Interconnect that we mentioned earlier. This high-speed interface connects the processor (or processors, in a multi-proc machine) to the chipset. Intel currently has two QPI speed iterations. The Core i7-965 Extreme Edition runs at 6.4 gigatransfers per second and the non-Extreme chips, such as the Core i7-920 and Core-i7-940, run at 4.8GT/s.

The QPI is important to watch because ramping it up too far can kill your overclock. For example, pushing the base clock from its stock 133MHz to 200MHz on a Core i7-920 means that the QPI will default to 7.2GT/s. That’s quite bit more speed than the stock 4.8GT/s; however, we successfully tested a Core i7-920 running at 7.2GT/s and believe that’s still within the realm of viability.

The QPI speed of the Core i7-920 and Core i7-940 is derived by multiplying the base clock (133) by 36, which equals 4788 or 4.8GT/s. The Core i7-965 uses a default QPI multiplier of 48, but unlike the non-Extreme chips, the 965’s multiplier is not locked. If you believe your overclock is failing because you’ve cranked the QPI too far, you can try dropping the speed by changing the QPI multiplier. On some overclocking runs with a Core i7-965 Extreme Edition, we had to drop the QPI back from 7.68GT/s to 7.04GT/s to increase reliability. The bad news is that you can’t do this with the budget chips.

...
Parent - By cma6 (****) Date 2011-12-13 00:11
Charles, the was totally on point. I probably could push QPI slightly to get a slightly better O/C but it is not worth the trouble.
- - By Christian Packi (****) [de] Date 2011-12-30 00:53
May I hijack this thread for a random question. A friend of mine has a PC that’s regularly and randomly shutting down, supposedly due to overheating. It’s not a overclocked machine. I would be grateful for advice how he could stop that, maybe by underclocking it.
Parent - - By Phil Harris (***) [gb] Date 2011-12-30 01:39
If the shut downs are caused by heat then the most likely cause is dust in the fans and fins of the CPU cooler, or poor case ventilation.

He should open the case and with a soft brush and a vacuum cleaner he should make sure there is no dust inside, paying special attention to the cooler that sits above the CPU. You can also get blowers or cans of compressed air to blow out the dust, I don't think the cans work especially well to be honest, but anything that provides a good blast of air can be effective. Basically whatever shifts the dust is good.

Then make sure that all the case fans are clear and spinning properly, it's a common mistake to move the computer case too close to a wall or desk and prevent good air circulation. I once fixed a friends computer that had been over heating for months by removing the telephone directory that was sitting on top of the case and blocking the outlet fan...

Under clocking a CPU should never be necessary unless you want to save power or something fundamental is wrong with the way the computer is built.
Parent - - By Christian Packi (****) [de] Date 2011-12-30 16:56
Thanks, he tried all that and it didn’t work.
Parent - - By Phil Harris (***) [gb] Date 2011-12-30 18:06
In that case the next thing is to investigate the individual components starting with the power supply. The simplest way to test is by replacement with a known good PSU, alternatively a multimeter to check the 12v and 5v outputs during a failure will do the job.

If the PSU is good, then test by replacement the RAM and graphics card, and if possible the CPU itself. If none of those is responsible then it's possible that he has a faulty component on the motherboard itself, the most likely culprit would be a capacitor somewhere in the VRM circuitry, in which case a replacement motherboard is the only sensible way forward.
Parent - - By Banned for Life (Gold) Date 2011-12-30 18:14
I agreed with your first post 100%, but am a little surprised by this post. If the air paths are all clear, I would remount the heat sink with a good TIM. This is not a trivial operation for a casual user (they won't have TIM lying around), but it's a lot easier than replacing the power supply, and probably has about the same chance of success...
Parent - By Phil Harris (***) [gb] Date 2011-12-30 18:32
Good point, I assumed the CPU temp would have been checked with something like this: http://www.alcpu.com/CoreTemp/

As long as the computer hasn't recently been moved or heavily jolted, it's quite unusual for TIM to fail to such an extent but yes, it should be investigated.
Parent - - By Christian Packi (****) [de] Date 2011-12-30 23:58
He did that. Didn’t work.
Parent - - By BigBen (****) Date 2011-12-31 07:26
Hi,
    Phil has basically said it all but you do need to see what the temps are as there maybe some thermal shut down thingy going on .... Is the computer just shutting off or giving a BSOD first? It maybe that there is something wrong with the OS install or that some drivers are playing up, even installed software can cause problems.

Regards
Parent - - By Christian Packi (****) [de] Date 2011-12-31 14:02
There is no BSOD. It apparently shuts down when the temperature goes above 120°C.
Parent - - By Regularuser (***) [gb] Date 2011-12-31 15:56
120C !   That is spectacularly hot.   BTW what sort of CPU is he running?

Definitely check 1) that the cpu cooler fan is working (is it connected properly, is it rotating?)   
2) check the it is correctly monuted on the CPU, and if need be replace the thermal paste.

Just run it with the case open so you can see the CPU fan in action, and also to ensure case cooling is not part of the problem.

The only other thing to check is that the voltages are reasonable.   Unless he has been trying to overclock the voltages should be within normal bounds but it is worth looking at if the cooling appears to be OK.
Parent - - By Christian Packi (****) [de] Date 2011-12-31 16:03
Has all been checked. How can he check the voltages?
Parent - By mocha1961 (***) [us] Date 2011-12-31 23:58
i guess he has to go back to square 1 by removing the battery from the motherboard for at least 1 min. and putting it back to start over again.
Parent - - By Regularuser (***) [gb] Date 2012-01-01 10:32
He can check what they are meant to be by going into the BIOS set up.

To see what the core voltage is (the most important I think in this context) he can run CPU-Z.

If the processor is a modern one, then if it is idle the core voltage will probably drop because of the power saving features of modern chips.

If the processor is under full or full-ish load then core voltage should be at the voltage set in the BIOS.  In my experience at full load the voltage tends to be a little bit lower than the voltage set in the BIOS, presumably because of the internal resistance of the motherboard and power supply combination.

Anyway, a core voltage of something like 1.35 to 1.4 is normal for most chips.   At 1.5 V expect it to be chucking out a lot of heat and to need extra cooling.

As per previous replies, if the chip is modern, I am surprised that it is not shutting down way before 120 C.   Old chips did not have temperature protection built in and would just over heat until some part of the chip fail or even worse was destroyed.
Parent - - By Christian Packi (****) [de] Date 2012-01-01 15:56
Core voltage is at 1.2375V.
Parent - - By Regularuser (***) [gb] Date 2012-01-01 19:02
Is that voltage under full load?

What does the BIOS say the core voltage should be?

And what CPU is it?
Parent - - By Christian Packi (****) [de] Date 2012-01-02 00:58
No it’s standard load.

See below for CPU. Bios voltage says 1.18V.
Parent - By Regularuser (***) [gb] Date 2012-01-02 10:17
That is quite high for this chip but is within the range for this chip  - according to Intel the core voltage on this processor is 0.850v - 1.3625v

Interesting that the actual voltage is quite a lot higher than the BIOS thinks it should be.   I have never used one of these chips, so there are much better people than me around here to talk about this, but from what I have read there are two voltage settings for this, VID and the actual core voltage.

If this were my problem, I would set the core voltage and VID lower in the BIOS and see if the temperature drops.   Not very scientific, but I can't think of anything esle to suggest.   If the cooling is set up right it must either be a CPU or motherboard problem.
Parent - By Banned for Life (Gold) Date 2011-12-31 22:20
120C is well above maximum junction temperature for the CPU. The CPU normally shuts down well before this temperature.
Parent - - By BigBen (****) Date 2012-01-01 08:57 Edited 2012-01-02 08:25

>It apparently shuts down when the temperature goes above 120°C.


:eek::lol::yell: Sounds like it is trying to do its own version of Chernobyl, TBH I am not even sure how it is getting to 120C lmao ... Even if the processor had no heatsink attached and with over volting I think it would prob shut down before 120C. I guess there could be a fault with a sensor?

>i guess he has to go back to square 1 by removing the battery from the motherboard for at least 1 min. and putting it back to start over again.


This will set everything in the BIOS back to default and prob set the date to some strange year or you could go direct to the BIOS and check through each setting.

I know on my motherboard there is an option to allow extreme overvoltage and options to turn off a few safety features but even so I doubt my processors built in survival features would  allow it to 120C lol

Regards
Parent - - By mocha1961 (***) [us] Date 2012-01-01 14:00
guess what. we are trying trying to solve a problem from christian packi and we dont even know what are the specs of that pc his friend have. :confused:
Parent - - By Christian Packi (****) [de] Date 2012-01-01 15:53
Here's what he sent me. He has two gfx cards and runs another monitor and a tv with it.

Intel® Core™2 Quad CPU Q9400 @ 2.66GHz @ 2666MHz ( XFX XFX nForce 780i 3-Way SLI mainboard) 8GB, 5.4GB free 596GB, 113GB free

NVIDIA GeForce 9800 GTX/9800 GTX+ (512MB), 2560x1600x32
Parent - By BigBen (****) Date 2012-01-02 08:45

>He has two gfx cards and runs another monitor and a tv with it


Hi,
    That is a variable that needs to be thought about ( http://www.microsoft.com/athome/organization/twomonitors.aspx ) ...... What power supply is he running? maybe the power being used for the 2 GFX cards is a problem ... Has he got the dual monitor + TV setup configured correctly, it could be down to a refresh rate but still does not explain the temperature problem .... If there is a spare CPU about that can fit the motherboard try fitting that and see if the temps are as bad.

I am assuming the ambient air temp is not that of the sahara desert lol and that the processor fan does not shut itself off for some odd reason ...... Take the sides off the computer case and see if the temperatures are any better.

Post the temps of the processor at idle as they should not be more than say 10-15C higher than the ambient air temp for a air cooled computer .... If they are very high then there is a good chance it is to do with the thermal compound, heatsink and fan which is where we all started lmao

Regards
- - By mad max (***) [us] Date 2012-04-08 15:58
I'm haveing a problem ocing the cpu strap passed 38 cpu ratio.set up currently is as follows:
125 bclk
125cpu strap
38 mult.
1.42.vcore
1600ram
running on xmp.
I have the same problem running maual.Would appreciate any help.
thnx

3930k
W XP. 64 bit
Parent - - By Arrière Pensée (Gold) Date 2012-04-08 17:24
Check this out dude- albeit he's overclocking a 3960 but I would imagine the principles are the same.

Parent - - By Bouddha (****) [ch] Date 2012-04-09 10:53
For chess on the new i7 3930 or 3960 should HT be turned "on" or "off" ?

Also what is the advantage for chess of the 3960 over the 3930 if any ?

Thanks
Regards
Parent - By Arrière Pensée (Gold) Date 2012-04-09 12:20 Edited 2012-04-09 12:28
Not a thing as far as I know- as a matter of fact in some cases 3930 out performs the 3960. Unfortunately, this video was the only one giving an example of someone running through tweaking the bios for an overclock-which happened to be a 3960.  I am not familiar with any new info on the merits of having HT enabled for chess.

Also, what I tend to agree with that this dude does is disable intel SpeedStep- It is my impression that  this makes it easier to get a more stable OC.  I don't fool with too many variables and leave most Ai Tuning on auto-
Parent - - By Arrière Pensée (Gold) Date 2012-04-08 17:28
I'll be joining you sometime next week in attempting to achieve the same experience- right now all I can do is gloat on with anticipation. :smile:
Parent - - By mad max (***) [us] Date 2012-04-09 00:40
thnx bud.Wasn't cpu strap oc,but informative non the less.Gl with your rig.:wink:
Parent - - By Arrière Pensée (Gold) Date 2012-04-09 00:43
He left his on auto-if that is what you mean.
Parent - - By mad max (***) [us] Date 2012-04-09 00:57
yes..
Parent - - By mad max (***) [us] Date 2012-04-09 01:02
1.555,,vcore! i give that chip 6 mo's if playing engine chess.
Parent - By Arrière Pensée (Gold) Date 2012-04-09 01:40
Well, I certainly wouldn't personally be interested in beating any records in overclocking. I don't think you need to stress the chip to get a good performance out of her. If someone whats better -my suggestion would be to go with a new SR-X or buy a used SR-2!
- By bort1964R (*) [ru] Date 2012-10-30 17:37
Where it is possible to buy TXA2E21600GA6001 1.6TB?
- By cma6 (****) Date 2013-09-12 19:38
Intel i7-4930k 
St 1.35V as our absolute voltage ceiling with 24/7 stability being a prerequisite for a successful overclock. Believe it or not though, our Noctua NH-U14S and Corsair H100i returned identical clock speed results, proving that temperature wasn’t a limiting factor with either processor. Results are based on single-source samples and don’t necessarily represent what you will achieve.

4930K provided decent results here as well, though it couldn’t hit the same levels as its little brother. It ended up topping out at 4.65GHz but anything higher and our system simply gave up, refusing to POST until the CMOS was cleared.

Satisfied with the overclocking results posted by these two processors. Neither was able to hit the 5GHz mark but they outpaced the i7-4960K and the i7-4820K may have just made a convincing argument in its favor over an i7-4770K.

9/10/13  http://www.hardwarecanucks.com/forum/hardware-canucks-reviews/63119-intel-i7-4930k-i7-4820k-ivy-bridge-e-review-17.html
- - By cma6 (****) Date 2013-12-15 22:54 Edited 2013-12-16 00:50
I've got a new system: Intel Core i7-4930k @ 3.4 GHz stock/3.9 GHz Turboboost; MB: ASUS X79 Deluxe;
32GB of G.Skill DDr3 (PC3 17000); Coolermaster Eisberg 240L Prestige watercooling.

In BIOS, I set Vcore to 1.25 volts and the 6 cores to 41 ratio.
No problems with bootup in Win x64 GUI and ran H4 in infinite analysis with no problem. After boot, Coretemp initially shows 4.1 GHz core frequency, though it falls back to standard 1.2 GHz.

It is necessary to set threads in the engines to 12 on this 6-core system. If set them at 6, then core speed is capped at 3.4 GHz. If I set threads to "12", then the engines run at 4.1 Ghz. H4 opening position after 60 seconds goes at 13550 kN/s (max. temp. 69C) compared to 3.4 GHz at 9251 kN/s for H4 after 60 seconds.

It is clear that the i7-4930k is a better for chess than the i7-3930k, since the latter produces for me only 12,026 kN/s with an O/C of 4.3 GHz vs. 13,550 kN/s @ 4.1 GHz on the i7-4930k.
Parent - By Pia (****) [ru] Date 2013-12-20 15:33

>If I set threads to "12", then the engines run at 4.1 Ghz.
>H4 opening position after 60 seconds goes at 13550 kN/s


If I set Q6600 to use 12 cores at 4100MHz, H4 32-bit will be at 3488*5.125= 17876 kN/s
Lucky me  :eek:
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