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Up Topic The Rybka Lounge / Computer Chess / The Overclocking Thread II
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- - By Uly (Gold) [mx] Date 2010-03-07 12:12 Edited 2010-03-07 12:14
To avoid people "bumping" old thread branches from 3 years ago, please make all your posts related to overclocking here.

Link to old thread:

http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=1871
Parent - By titanium cranium (***) [us] Date 2013-01-12 16:55
Have anyone gotten an i-7 to run at 5.0ghz reliably?
- - By BOARDSCRATCHER (*) [gb] Date 2010-04-05 09:48
New to overclocking is this OK for a 1st try?

Intel core i7 860
Xtremgear HDT 120 CPU cooler
Gigabyte P55M-UD2
4GB Corsair PC1066 XMS3
Corsair 650w power supply
Antec 300 case plus 2 front fans
Kingston 64GB SDD
Powercolour HD5670 512MB

I have increased the BCLK to 150 x 21 = 3150 do you think this is safe?

Boardscratcher.
Parent - - By BrandonSi (***) [us] Date 2010-04-05 14:03
Sure, if that's the only change you made it should be safe as long as your temperatures aren't very high, and you don't notice any system instability.

You can obviously go much higher (for example my 860 is at 3.9GHz), but do your research first. You can very easily kill a hardware component if you are not careful.
Parent - - By BOARDSCRATCHER (*) [gb] Date 2010-04-05 21:58
Thanks Brandon, Temps are 40C on full load.

I had also turned turbo and hyperthreading off.

3.9GHz wow, I think I need more experience. Thanks once again.
Parent - - By SchachProfi (****) [de] Date 2010-04-18 21:29
@BOARDSCRATCHER: Just google for "overclocking guide i7" and you will find several useful inspirations.
Overclocking of the 1156 sockets is a little bit more difficult than of the 1366 sockets because of the
integrated PCIe-controller on the chip and a few other challengers, but nearly every one should touch
the 4,0GHz on a good board, and your Gigabyte seems good enough for an overclocking, but there are
fur sure better suited boards out there...

Good luck,

Alex
Parent - - By Geomusic (*****) Date 2010-05-04 07:00 Edited 2010-05-04 07:06
I wanna overclock my laptop :)

I've been good though I haven't opened the insides of it yet :)
Parent - By Bobby C (****) Date 2010-05-06 03:42

> I wanna overclock my laptop


Haha, good luck with that. You most likely will need a new bios that supports an overclock and also a new heatsink/thermal paste to support the increased heat. Most laptops come with bios that will not support overclocking.
- - By Hurnavich (*****) Date 2010-05-05 21:55
Hi, I have the following computer system:

1. Antec 900 Gaming Case
2. Asus Rampage II Extreme Motherboard
3. 12Gb Corsair Ram DDR3 (6 x 2)
4. i7-950 CPU
5. 2 x 1Tb Hard Drive
6. Asus 1Gb Grafix Card
7. Coolermaster V8 CPU Cooler
8. 750 watt Power Supply

At some point in the near future I intend to change the existing 750 watt power supply to a minimum 1000 watt supply, however I would like to overclock using the existing 750 watt power supply for the time being. Can any of you suggest what sort of safe overclock can be achieved and the bios settings needed to do this. I am new to overclocking so would appreciate it if any settings suggested be relatively simple to follow and apply.
Being that the stock speed is 3.07ghz how many ghz can be safely achieved without changing the power supply and what difference can be safely achieved with the 1000 watt plus supply?

Many thanks

Hurnavich
Parent - - By ppipper (*****) [es] Date 2010-05-05 22:26
AFAIK you won't need those extra 250 watt for normal overclocking (something like 4.2 ghz).

I understand overclocking is considered safe when you have core temperatures under control with a good cooling at full load. I don't know 950 but I am pretty sure it will be able to run under 75-80º at full being safe.
Parent - By Hurnavich (*****) Date 2010-05-11 08:53 Edited 2010-05-11 08:59
Hi, thanks for reply,

My core temps are running at 74 C at full 100% load
my cpu temp reads  42 c

4.2 ghz overclock

Is the cpu temp ok with the above core temps, as i read somewhere that there should not be a huge difference between the two.

Many thanks

i'm a newbie and have very little knowledge on overclocking.
Parent - - By Phil Harris (***) [gb] Date 2010-05-05 22:31
750 watts is easily powerful enough. I have 920 at 4.3gHz on a 620 watt and two 6 core 980s over 4gHz, both on 650 watt PSUs.

The first thing I would say is that not all power supplies are the same. I would rather have a 600w from a decent maker than a 1000w from an unknown source. The other thing that can be relevant is what sort of graphics card(s) you intend using.

The spec you list could easily be driven up to 4.5gHz (obviously with appropriate cooling) with a good quality 620w PSU, so save your money.

As far as the over clocking is concerned, there many sources of good information out there. I would suggest starting with a couple of hours google searching on "i7 Overclocking". Read the guides carefully and if you have any specific questions there are many here who can answer then for you.

You will probably be limited to between 3.8 and 4gHz with that air cooler, depending on the ambient room temperature of course.
Parent - - By Hurnavich (*****) Date 2010-05-10 06:48
Hi, many thanks Phil and all,i have now joined the 4.2 ghz club.Yippee, so how much life shortage will my chip have now if any? many thanks

Hurnavich
Parent - - By Bobby C (****) Date 2010-05-10 07:11

> so how much life shortage will my chip have now if any?


Heat is the only thing that will shorten the lifespan of your chip. As long as you keep your temps low your chip will last as long as it would at a slower speed. General rule of thumb is that higher speed requires highers volts which in turn create more heat and heat is what degrades the silicon inside your chip. Eliminate the extra heat and you can run higher volts and more speed.
Parent - By Hurnavich (*****) Date 2010-05-10 07:48
Hi,many thanks for sound advise,

hurnavich.
Parent - - By ppipper (*****) [es] Date 2010-05-11 13:01

> heat is what degrades the silicon inside your chip.


How do I know if my chip is reaching its end? I mean, is it a progressive deterioration that can be easily noticed or suddenly it will not work anymore?

Thanks
Parent - - By Bobby C (****) Date 2010-05-11 17:51
It will start to require more voltage to run at certain speeds.
Parent - By BigBen (****) Date 2010-05-16 10:06
Asus Rampage III Extreme + 980X and some cooling :)
Parent - By Ozymandias (****) [es] Date 2011-06-09 10:46
That's EM kicking in, and upping the voltage only solves the problem temporarily, but worsens it in the long run.
Parent - By Ozymandias (****) [es] Date 2011-06-09 10:43
High voltage would result in EM even if using an adequate cooling solution. See this example of EM in D9 chips:
http://www.xtremesystems.org/forums/showthread.php?t=140870
Which means that maintaining good temps is essential, but not the only thing to look closely when Overclocking.
- - By BigBen (****) Date 2010-05-24 16:18
Hi,
   I was offered a Gigabyte-GA-X58A-UD9 this morning and searching around I have actually been shocked at the price of this single cpu mobo .... Will it be better than the Asus Extreme 3 that I have at the moment? well for the price it should be
Parent - - By Bobby C (****) Date 2010-05-27 23:37 Edited 2010-05-27 23:43
Yeah that beast runs about $700 here in the states. It shouldn't overclock better then the Rampage III but their probably about the same. It's a big motherboard and I've heard it needs a good size full tower to hold it.
Parent - - By BigBen (****) Date 2010-05-28 08:59

>It's a big motherboard and I've heard it needs a good size full tower to hold it.


Hi Bobby,
             `TOWER!!!` ... what is that? lmao :) you have not seen my computer room it is like Frankensteins labratory ..... I will not get the Gigabyte board simply because I only use 1 pci slot so it is a bit OTT for my needs

Regards
Parent - - By Bobby C (****) Date 2010-05-28 18:12
Yeah and if your cat jumped on this one while it was running......... :)
Parent - By BigBen (****) Date 2010-05-29 10:09

>Yeah and if your cat jumped on this one while it was running.........


Hey that has happened in the past when the damn thing was a kitten and cats just love wires!! .... Actually it still has a thing for SATA cables :) but who knows what goes through a cats mind bit like women lmao

Regards
- By mad max (***) [us] Date 2010-06-20 00:50
the other day i noticed that the hoses on the water coolent system were considerably warm, not hot, but very warm is this natural?
- By macalimlim [ph] Date 2010-07-18 20:22
Anyone got a good overclock settings for:
Asus P5QL Pro
Intel X3220 (similar to Q6600)
Team Xtreem Dark DDRII 1066 4GB

Thanks
- - By cma6 (****) Date 2010-10-04 01:28
I would appreciate from you experts a starting point for parameters in the BIOS of a new MB. (My previous MB was the Gigabyte X38-DQ6.)

My upgraded system:  MB       ASUS P6T Deluxe V2

                                   CPU     Int3el i7 930 2.8 GHz stock

                                   RAM     Kingston HyperX DDR3 12 GB 1600
                              
                                   watercooling

                                    HD       Intel X25-M SSD SATA  160 GB

                                                       Thanks in advance.
Parent - - By cma6 (****) Date 2010-10-04 19:02
The toughest issues are whether to enable or disable certain CPU settings: C1E Support, Hardware Prefetcher, Adjacent Cache Line Prefetch,
Intel Virtualization (I disabled that one), CPU TM Function, Execute-Disable Bit, Intel HT technology, Intel Speedstep.
                             Thanks, CMA
Parent - - By Phil Harris (***) [gb] Date 2010-10-05 06:03
I would suggest you disable all of those except hardware prefetch and adjacent cache line prefetch, which I think are mildly beneficial.
Parent - - By Banned for Life (Gold) Date 2010-10-05 13:57
Have you ever tested adjacent cache line prefetch on/off? I would be very surprised if this were beneficial as it is a complete waste of memory bandwidth for hash table accesses which are dominant for chess engines. I would guess that turning this off would improve performance by a percent or two due to reduced memory bandwidth leading to slightly lower average memory latency.
Parent - - By Phil Harris (***) [gb] Date 2010-10-05 17:54
I can't say that I have tested with both settings. I left it enabled on the advice of someone whose knowledge was not specific to computer chess.

Your understanding of how Rybka uses RAM is far greater than mine, so I don't doubt your advice at all, I shall try it.

It's been months since I even entered the BIOS on any of my computers, I tend to devote summers to golf and work in roughly equal measure. It's amazing how quickly I have forgotten what it all means.
Parent - - By Banned for Life (Gold) Date 2010-10-05 19:59
It would be an interesting experiment. It's not a sure thing. You'll gain a little bit with every hash access, but lose a lot every time there is an instruction or non-hash table data access that misses because of this. Rybka has a larger executable than other engines, and more non-hash data storage, so turning this off is probably more advantageous for other engines.
Parent - - By Lukas Cimiotti (Bronze) [de] Date 2010-10-18 10:20
I tried it. Switching off prefetches is good for Rybka 3, but not for Rybka 4. For Rybka 4 a different compiler was used - this might have something to do with these results.
Parent - - By Banned for Life (Gold) Date 2010-10-18 14:20
Did the results for R4 stay the same or get worse?
Were you using large pages, or not?

It may be that Vas has found a way in R4 to prefetch far enough ahead, especially with use of large pages, that there is no stall for the hash access. He claimed that at one point but it seemed unbelievable at the time...
Parent - By Lukas Cimiotti (Bronze) [de] Date 2010-10-18 16:12
Results got a tiny bit worse - but it was so little it could have been noise. Large pages were off.
Parent - - By mad max (***) [us] Date 2010-10-07 01:58 Edited 2010-10-07 02:00
C1E support: disable
Hardware Prefetcher:enable
Adjacent Cache Line Prefetch:enable
Intel(R) Virtualization Tech:disable
Cpu TM Function:disable
Execute Disable Bit:enable
Intel(R) Ht Technology: A20M: disable
Intel(R) C-STATE Tech: Disable

GL..
Parent - By cma6 (****) Date 2010-10-07 02:19
Phil Harris: I would suggest you disable all of those except hardware prefetch and adjacent cache line prefetch, which I think are mildly beneficial.

Neptune:C1E support: disable
Hardware Prefetcher:enable
Adjacent Cache Line Prefetch:enable
Intel(R) Virtualization Tech:disable
Cpu TM Function:disable
Execute Disable Bit:enable
Intel(R) Ht Technology: A20M: disable
Intel(R) C-STATE Tech: Disable

There is disagreement between the experts on "Execute Disable Bit". Any arguments as to why to enable or disable it?
- - By cma6 (****) Date 2010-10-05 02:00
A follow up to an old Phil Harris post:"Your target over clock is pretty straight forward on the P6T.
Open the BIOS and go to advanced tab, then to CPU Configuration. You will see a list of settings (don't forget to scroll down to  see all). The only ones to change from default are the following.
C1E support (Disabled)
Intel Visualization Tech (Disabled)
CPU TM function (Disabled)
Intel HT Technology (Disabled)  - This is what I recommend for Rybka, though some engines might benefit from HT, Rybka doesn't appear to.
Intel Speedstep Tech (Disabled)
Intel TurboMode Tech (Disabled) -  This is not effective when running 4 cores anyway
Those are the only ones you need to change.

Now go to the AI tweaker menu and Set the AI Overclock tuner to manual.
Set the Bclock frequency to 180.
Leave everything else on Auto except CPU voltage, and there just type in 1.3
Now hit F10 and exit saving changes
That should boot up at 3.6gHz and be very stable. Test the temperatures at full load. Assuming it passes the 1 hour stress test, and the temps remain around or below 65c, you can try the Bclock at 190."

I have a similar system:  MB       ASUS P6T Deluxe V2
                                   CPU     Int3el i7 930 2.8 GHz stock
                                   RAM     Kingston HyperX DDR3 12 GB 1600                             
                                   watercooling
                                    HD       Intel X25-M SSD SATA  160 GB

I was able to get 4 Ghz core speed (3.96 GHz) using Phil's 180 Bclock with a 22 Multiplier, but at Bclock 190 I got a Windows 7 BSOD.
      Would 180 Bclock be my limit or are there other settings to change?
       Thanks, CMA
Parent - - By Phil Harris (***) [gb] Date 2010-10-05 06:33
There are many things to try at this point. Assuming you still have reasonable temperatures you can try the following.

Set the RAM voltage (Vdimm) to 1.64V and the QPI/DRAM core voltage to 1.32v. I found the most likely cause of blue screen problems were memory related, this should help reduce those.

As a very rough guide, CPU crashes tend to cause lock ups or black outs followed by restarts. Those can most often be fixed by a little more Vcore or if temps are high, by reducing Bclock a little.

Blue screens are more likely to be RAM related. There will be a code attached to each blue screen failure that can often provide a clue as to it's cause. It can be hard to pin down exact causes, but will often get you to the right area. Look for the BCCode number, a frequent one is 124, which points to RAM issues.
Parent - - By cma6 (****) Date 2010-10-05 14:40
By RAM voltage, I assume you mean DRAM bus voltage?
  Also, I don't see any VTT in my bus? Could that be "CPU PLL voltage" or some other name on the ASUS  P6T Deluxe V2?
Parent - By Rubén Cómes (****) [ar] Date 2010-10-05 17:49
QPI-Dram voltage = VTT
Parent - - By cma6 (****) Date 2010-10-05 23:16
I have a stable OC of 22X190 = 4.18 Ghz with Vcore = 1.3375 ; VTT = 1.30625 (high nos. freeze the mouse); DRAM Bus volt = 1.64
   So the core speed is 25.5% higher vs. on the Q6600 with Gigabyte X-38 MB at 3.33 Ghz = 9 X 370 FSB.

  Is that a reasonable expectation for my latest rig?
Parent - - By Phil Harris (***) [gb] Date 2010-10-06 09:48
More is certainly possible, but would require quite a bit more fine tuning. I think I would probably stop there unless you really wanted to research further into the dark depths of over clocking...

Remember that although you have a 25.5% increase in core speed over the Q6600, the i7 has substantially improved performance per gHz also. So the true measure of what this upgrade has achieved is what sort of speed increase do you get for the engine. I would hope that's nearer 40/50% overall.
Parent - By cma6 (****) Date 2010-10-06 13:55
Hi Phil:
Yes, I will stop here. Your point is well taken about the improved performance/GHz of the i7 vs. the Q6600. On Ghz, I improved 25%. However, I notice that in similar or the same middlegame positions, I now see 564 Kn/s vs. 363 Kn/s for a 55% pickup in actual speed, instead of the 25% increase from GHz alone. Of course, 64-bit Windows 7 with Large Pages and better, bigger memory might also contribute to the net increase.
                Thanks for all your help.
                            CMA
Parent - - By Rubén Cómes (****) [ar] Date 2010-10-05 13:18
Errors and solutions:
1 - Vcore:

    * BSOD Code 101: raise Vcore.
    * Error in Linpack (LinX or IBT) per minute: up Vcore.
    * Application Linpack (IBT or LinX) causes BSOD: Top Vcore.

2 - CPU VTT Voltage:

    * Maximum recommended by Intel: 1.35v
    * No problems for 24 / 7: 1.45v
    * Generally goes up when the BCLK.
    * BSOD Code 124: Top CPU VTT Voltage.
    * Error in application Linpack (IBT, LinX) from 10 minutes: Upload VTT.
    * Application Linpack (IBT, LinX) freezes: Top VTT.
    * Application Linpack (IBT, LinX) PC reboots without BSOD: Top VTT.

3 - QPI Vcore PLL:

    * Application Linpack (IBT, LinX) without BSOD error occurs: Top QPI Vcore PLL.

In summary:
What to do when you pass ....?

   1. BSOD Code 101? Top Vcore
   2. BSOD Code 124? Top VTT and Vcore
   3. The system freezes, but no BSOD and restarts? VTT improperly adjusted, up or down depending on the case.

NOTE: All other code in the BSOD showing that differs from the previous 2 sacks, depending on the code, it means something for some processing failure, so too are faulty Vcore voltage. So the solution is to increase the Vcore voltage.
Parent - - By cma6 (****) Date 2010-10-05 13:58
Thanks, as always, to Phil for the on-target posts.

  And thank you, Crawley, for the information about Windows 7 BSOD codes. Although I did not understand much of the post, I have printed it out to compare with the Windows error code on the next crash. (There is always a "next crash" for O/Cers.)
Does "Top" mean "increase"?
  VTT?

                              cma6
Parent - - By Rubén Cómes (****) [ar] Date 2010-10-05 14:00
Sorry for my horrible english.

Yes, increase VTT.
Parent - - By cma6 (****) Date 2010-10-05 20:43
Hi Crawly:
"The system freezes, but no BSOD and restarts? VTT improperly adjusted, up or down depending on the case."

  I have a good O/C at 190 X 22 = 4.18 Ghz.   But at 195 Bclk, the system freezes in Aquarium, last time after 90 minutes.
     So how should VTT be adjusted for that: up or down from 1.30625 v?

                                    Thanks, CMA
Parent - By Rubén Cómes (****) [ar] Date 2010-10-05 20:47
The VTT is little.
Up VTT.
I use in all machine 1.35 ore more.
Up Topic The Rybka Lounge / Computer Chess / The Overclocking Thread II
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