Strange system lockups during Heavy Graphics Stress

Ok, I'm trying to figure out if this is a cause of my Video Card or if its something else that is causing the issue.

eVGA 680i SLI (122-CK-NF68)

Intel Pentium Core 2 Duo E6700

4 x 1GB of DDR2 800Mhz Patriot Extreme LL (4-4-4-12) PC6400

BFG 7950GT

I've got my CPU running at 3.25ghz stable... have not yet touched the factory settings on my Ram modules. And I have my Video Card running at (Core 608mhz, Mem 797mhz).

Now, this lock up issue has always happened even when the vid card was not overclocked. I've noticed that it always happens within the first few minutes of playing a very graphic heavy game while the Video card ram switches from the 797mhz to 1244mhz. During this time its not just the Frames that lock up, its the entire system. If I'm playing a racing game I don't have to worry about running into anything because the whole system completely stops, even the sound starts looping till it goes back into normal play. I do not see any artifacts and my system did run stability tests on the GPU giving it a passing score. My question is, is this a driver issue or possibly be because my ram has not been overclocked yet.. any seggestions?
17 answers Last reply
More about strange system lockups heavy graphics stress
  1. Its always ur heat problem or ur psu just isnt up to the job.

    LOAD=HAET+POWER MUNCHES........ hehehhehehehehehehhe
  2. state what psu u have....... might be some help
  3. Having your RAM not overclocked isnt going to make it any less stable. From what you said, it sounds like the freezing stops after some time and it goes back to normal, is this correct? It could be your power supply, list that too (not just wattage, brand and model please).
  4. I appriciate the info, I'm currently at work so I can't post the details of my PSU, I can tell you its an Antec 500w HE, I got it about a year ago and I am planning to make a new PSU my next upgrade while I prepare for SLI'd 8800GTX's.

    Here is some addl info about my system as far as an idea of power consumption.

    1 160GB SATA (7200RPM) and 1 250GB SATA (7200RPM)
    Audigy2 ZS soundcard
    2 120mm Case Fans, 3 80mm Case fans.
    1 Floppy Drive
    1 CDDVD (Dual Layer) Read/Write

    When I get home from work I will post the specs on that 500w PSU.
  5. If it locks up, it's NOT stable. Try dropping the OC on the graphics card a bit.

  6. as stated in my original post... even stock it still locks up for several seconds then goes back to normal use.
  7. Then try reducing OC on CPU a bit :!:

  8. I've done stable tests on the Processor, no problems what so ever.
  9. Resert all OCs back to default, even if stress tests dont fail, it doesnt necessarily mean the cpu is stable. Some applications are VERY sensitive to OCs. If you are having stability issues, the general rule of thumb is assume its the OC causing the problem, because it generally is. If it still locks up, then you have at least ruled out the OC as the problem.
  10. Yeah, write down all your OC settings, reset them all to absolute defaults, or to the ones stated on the packaging. Then try again, if it still locks up then you know its (probably) not the OCing. If it doesn't then you know what it was. Then start putting your old settings back until it does it (one at a time - wherever possible) Hope that helps.

    Try a friends 650w PSU aswell.
  11. Pshhh, I don't know anyone with a 650w PSU :P this is Arizona we are talking about. I've probably got the fastest PC on the in the neighborhood. I've ordered an 800W PSU from Newegg, I will try resetting all my values to default and see if I have the same problem. Thanks for all the advice guys, I appriciate it.
  12. Here is a break down of my PSU
    Output Voltage +3.3V +5V +12V1 +12V2 +12V3 -12V +5Vsb

    Max. Load






    Min. Load 0.5A 0.3A 1A 1A 1A 0A 0A
    Regulation 3% 3% 3% 3% 3% 6% 3%
    Ripple & Noise(mV) 50 50 120 120 120 120 50
    Available Power 75.9W 85W 456W 9.6W 12.5W
    Total Power 500W continuous output @ 50C ambient temperature


    Input Voltage

    100Vac to 240Vac +/- 10%

    Input Frequency Range

    47Hz to 63Hz

    Inrush Current

    60A @ 115V , 100A @ 230V

    Input Current

    9A @ 115V, 4.5A @ 230V

    Hold-up Time

    20ms at full load

    Up to 85%
    115V - Full load 76%; Typical load 82%, Light load 77.9%
    230V - Full load 80%; Typical load 85%, Light load 79.45%


    FCC Class B
  13. I assume thats talking about the antec. The 500W neo HE has 38A on the 12V rails to play around with, so its got the power there. I suggest you drop all your OCs to defaults and reevaluate from there. One you have done this, post back the results.
  14. Ok, so I've spent a lot of the day tweaking and completely re-doing my Oc's. I wanted to get my Mem to a 1:1 FSB:Mem ratio. pulled my FSB to 1600 and dropped my CPU Multiplier to 9, giving me 3.6ghz. And I tightened down my mem timings to 4-4-4-12 (it was defaulted to 5-5-5-15 by my bios). The system did post however I started getting system errors in windows. I may have to mess with my Voltages alittle more but I would have thought that 1.5v to my CPU would have been enough for the 3.6ghz since I can run stable at 1.4v at 3.2ghz. So anyways, I restarted and dropped the multiplier to 8 giving me a 3.2ghz OC on my processor. The system is running stable. I dropped by Vid card oc to default, did some tests and then started ocing from there. Suprisingly enough I actually have achieved a higher overclock that DOES NOT cause any lock ups like my previous settings did. I'm definately going to have to keep testing diff levels of V on this processor to at least push it to 3.4ghz... I'm going to be deeply saddened if my E6700 can't even reach levels that i see E6400's reaching.

    One strange thing with the overclock is that my built in system monitor shows an FSB of 2000, with my Ram running at 1000mhz and my CPU running at 4000mhz. I almost had a heart attack when I pulled it up and it said that... thank god CPU-Z is reflecting the actual settings.
  15. Some Benchmarkings with my new settings.

    3DMark05 gave me a score of 11191.

    Company of Heroes with Maxed Settings (AA x 4) had Avg FPS of 39.

    and Half Life 2: The Lost Coast Stress Test with Maxed Res/Detail (16xAA, 8xAF) had an avg FPS of 128.
  16. So I assume the OC was the problem then, yes?
  17. Yeah, sounds like the graphics overclock was causing problems. If it goes too fast you'll see lockups and driver errors etc.
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