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System shutting down mid-game

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I bought a few new pc parts a few weeks ago for the first time in a few years and have been having it just quit (power shuts off) in the middle of intensive gaming. My second question is this system isn't able to max out the new Call of Duty, not even on a lower resolution like 1280x1024. I sometimes get down to the 20fps and stuttering.

AMD Phenom II X3 720 (not black edition got screwed)
GA-MA790x-DS4
3GB DDR2 (one stick 2gb 800) (other 1gb 400)
ATI HD4850 512mb Crossfire

Right now my solution (which isn't really working) is two PSUs. One is a general 550w that I don't think has the power in it's old age (2-3 years got it from my roommate) and the other is a 350w that I've tried powering both video cards on the 350, just one, just the hdd and two fans, nothing seems to keep it stable.

Here are the stats on the back of the PSU, could this be a different problem, a bottleneck?

CODEGEN 500X
(+3.3v&+5v=235W Max;+12v1 & +12v2=320W Max ALL OUTPUT IS EXTENDED TO 550W)

Rosewill RV350-2

Here some pics for fun:


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CPU never goes over 40c, is usually around 29c idle and 36c when OC'd to 3.3ghz

The most I've seen it climb was 70c under some intense singleplayer Prototype and multiplayer Shattered Horizon I've used GPU-Z logs to show the temps were sometimes around 50-60c on the GPU during shutdown. I've seen it sometimes go to 70c and still be fine and othertimes shutdown.

Then again I've also forgot to load a fan speed profile on startup and the GPU has seen 80c no problem.
Power supply Master

The first thing to do is to get a decent power supply instead of struggling with an inadequate one (the 350 watt) and one piece of junk.

I'd recommend at least a 650 watt Antec or Corsair.

You may have other problems but inadequate power is the first thing to fix.
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Alright, I guess I'm screwed. How many 12v+ rails do I need on this new PSU? I assume 3 because the cpu needs one, and one each for the video card, right? how does that all work. I'm trying to save the most money I can since I don't have any.

I'll be honest when I first saw the price I cringed a bit. And while I would love to have that setup (Since i'm running without a case now and cords look bad) I just can't do 75 upfront.

(In college living off debt with a work paycheck that feels like every other month)

Any suggestions in the 40-50 dollar range? I won't be upgrading ever besides replacing one stick of ddr2 with a high capacity one. The only power drains besides whats posted are the 1 fan (one just broke) and the three usb devices (keyboard, mouse, camera (used a mic)) No burner or anything fancy.

Also, when I try and power both HD4850s with the Rosewill RV350-2, the system works, but when it goes to 3D it hangs, as in the screen just stays at what it was. For example if I'm using ATI auto-tune the system just displays the colors. Everything is running still, I just can't alt tab out or do anything. Any ideas why that's not fixing the problem?

I doubt you will be dissapointed, OCZ is good stuff. To be honest, the one you ordered if it's the same as I looked at, is probably a better unit than what I suggested. I just knew you said 50 bucks would be preferable.
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