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Up Topic Rybka Support & Discussion / Rybka Discussion / Is Rybka4 Engine Power Hungry?
- - By mocha1961 (***) Date 2010-10-02 16:35
my friend's pc has 1200w psu. he is running his 980x at 4.5ghz. water cooling with 2 chillers. temp isnt the issue. evga mobo with 12 gig rams at 1900mhz. small gpu. 2 radiators(double fans), if he is just browsing the net, everything is fine. but once he run rybka4 engine on infinite analysis, his pc stops. no blue screen of death. is this PSU issue?
Parent - By Banned for Life (Gold) Date 2010-10-02 17:41
R4 is a real stress test for PCs. Browsing the net is a walk in the park. What stress testing has been done (aside from failing with Rybka)?.
Parent - - By M ANSARI (*****) Date 2010-10-02 17:50
More likely this is an overclocking issue.  Actually Rybka does not stress the engine as much as other engines.  For example Zappa Mexico II heats up more than Rybka and puts more stress on your system.  Try running Prime 95 for a few hours, most probably it will fail.  Browsing the internet is equivalent to almost doing nothing on your PC, so it will not stress your system.  Chess engines however, will use almost 100% of CPU capabilities.
Parent - - By mocha1961 (***) Date 2010-10-02 18:23
he did run prime95 and also the pc turned off by itself, and not even 1 min yet. but again no BSOD. if it is an overclocking issue, BSOD should appear, isnt it? he was wondering that the 1200w PSU maybe not be enough when he runs R4 at 100% load. maybe just enough if he is just browsing the net?
Parent - - By M ANSARI (*****) Date 2010-10-02 18:39
You don't need a BSOD to get an overclocking crash.  It could be simply that everything freezes, or maybe the computer reboots, or the audio goes into a repeating audio signal, or sometimes only the application will crash or even only one core of the many cores being tested will give an exception fault.  In some cases your system will be absolutely stable with an engine tourney going full blast for hours ... yet as soon as you move your mouse it will crash.  This has nothing to do with the power supply and is simply pushing the envelope a little too hard with the overclocking setup available.  Try going back to default speeds and then see if you have the same problem.  If so then you have something to worry about, otherwise you might simply have to tone down that overclock.
Parent - - By mocha1961 (***) Date 2010-10-02 21:09
i will tell him to run his pc at defaults. i will keep you guys posted with results. i really appreciate your responses. ty.:smile::smile::smile:
Parent - - By mocha1961 (***) Date 2010-10-03 00:37
he did run prime95 on defaults and still his pc stops without BSOD after just seconds running P95. kinda weird scenario.
Parent - By Labyrinth (*****) Date 2010-10-03 03:10
Check the temps, what are they at idle/load?

Sounds like whatever cooling system in use is malfunctioning.
Parent - By M ANSARI (*****) Date 2010-10-03 06:54
The it looks like he has a problem.  The first thing I would check is that there is adequate contact between the heat sink and the CPU with proper thermal compound in there.  A lot of times when you put a HS you think you have it on flat but it is actually touching only part of the CPU.  I would check all cores on idle and then on load and see that all core temps are OK.  You have to eliminate any possible problem with the obvious memory, then VGA card, then PSU.  It is very possible that your PSU has lost its ability to hold the required amps on some rails.  That is one of the main reasons that I invest in very high quality PS like Thermaltake ... but even then they can go bad.  You just have to try many different things and rule out the items one by one.  It is also possible that you simply have a faulty motherboard ... look at the motherboard and see if you have any swollen capacitors.
Parent - - By Lukas Cimiotti (Bronze) Date 2010-10-03 07:29
Sounds like a RAM or mainboard problem. In this situation I'd try to start with only one memory module. But if it's a problem of compatibility this won't work.
Parent - By mocha1961 (***) Date 2010-10-03 18:53
i found his problem. he sent me a pic of his pc in his room. guess what. his pc was located where back of his pc is too close to the wall. and the left side of his pc is too close to his cabinet where 2 fans from the radiator is blowing out. in other words, heat that was being expelled from the pc is being push back in the pc . thus auto shutting from the PSU. all is well now. thx guys. :cool::cool::cool:
Parent - By Phil Harris (***) Date 2010-10-02 19:58
1200w is far more than you need for that setup, unless you have multiple high end video cards.

Personally I would use a 750w or 850w PSU from a good manufacturer to run that, so his problem is elsewhere.
- By Rubén Cómes (****) Date 2010-10-03 03:29
I am using 1250 wats for SR-2 x5650 @4.2 ghz * 12 cores 24 threads.
700 w is ok for your config.
What vcore are using?
Up Topic Rybka Support & Discussion / Rybka Discussion / Is Rybka4 Engine Power Hungry?

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