I recently built a computer with the following specs:
Asus Rampage III Gene motherboard
Intel Core i7-930 processor
6 GB ram
650 watt power supply
80 GB Intel X25-M Solid State Drive
Windows 7 64-bit Home Premium
It starts up fine, runs perfectly, EXCEPT and ONLY when I play a game for some period of time. I can leave the computer on, or just browse the web for the whole day and it works fine. It's crashed from Modern Warfare 2, Starcraft 2, and Crysis: Warhead. After awhile of gaming, the computer will spontaneously initiate a normal windows shut down (all programs close, logs me off, then shuts down). All examples of PCs shutting down during gaming I've googled have the computer powering down as if someone pulled the cord. This does *not* happen in my case, the computer initiates a regular windows shut down in the middle of my game. I will typically get some warning signals that this is about to happen by some video stuttering and some strange audio sounds (through the speakers, not from the computer itself). I have ruled out:
Video card issue - This problem happens with multiple video cards
CPU issue - I was almost certain it was a CPU overheating problem, until I sent my i7 back to Newegg to be replaced. Got my new one today, same exact problem after about 30 minutes of starcraft. Temperature monitors are also reporting within a normal range.
This is frustrating me to no end. I've researched this extensively, and I can't find a single other case like mine. No blue screen, no error message, and a *normal* windows shutdown in the middle of gaming. Also, the computer can power back on immediately afterwards. I tried my best to research and solve this on my own, but I really have no idea what to do at this point. I would greatly greatly appreciate some more knowledgeable people weighing in here.
What is the brand of your PSU? Perhaps also how old?
What are the temps of your GPU and proc during gaming? (post them just to be sure)
My first suspects are :
1. not enough power. 650 should be enough, but if you have cheap PSUs, hmmm...that could be different...
2. over heat
Let clear those two suspects first, if they are clean, we will help you to find other suspects.
My GPU is reaching about 70 degrees C, and my CPU is between 60-70 degrees. My PSU is from Corsair, which I was under the impression was a reputable brand. That's not to say it couldn't be defective though, but what do you think?
70'C for GPU is normal, but the proc...60-70'C?
My Q6600 on 3GHz (2.4 GHz stock speed) has never been hotter than 55'C with Zalman CNPS9700LED with full load.
I think the proc temp could be the problem. After you played for some time, the proc is under load during games (perhaps full load) and it is getting hot, and...buff....shut down...
Given that you have a 5870, it could be an "immature" AMD/ATI driver problem.
When playing Gears of War, Modern Warfare 2, and CoD: World at War, and even with the gpu fan running at 85% to mitigate heat issues, my machine would reboot when I would go to load a new mission or quit out of the game. But as AMD.ATI released newer driver version the problem went away and all games ran stable.
Have since started running Win7 64bit and playing the heck out Starcraft2 and now I have the same issues with the machine rebooting when loading new missions or quitting out; but only when playing SC2, all other games run fine with no issues. Due to previous gaming experience, I am chalking it up to "immature" drivers. The game patches have helped to lessen the reboot problems but they still happen, occasionally.
CPU/GPU temps are/were not the problem, again chalking it up to an "immature" driver issue.