System reboots under heavy graphic load while playing Arma 2

Hey. I recently built a new pc. Have been building my own for many years. So I'm sure its put together correctly.Recently I started playing a new game called ARMA 2 its pretty heavy on the graphics. So after playing for a few hours I get a random reboot no BSOD or anything just shuts right off on me. My system is as follows. Feels like PSU but for a new sys and a 1000 W i hope its driver or something. I cant return the PSU I dont think.

Thermaltake TR2 RX 1000W Modular PSU

i7 960
Asus P65e Deluxe
6 gig OCZ ram
EVGA gtx 470 x 1
2 x WD 500 gig SATA

win 7 ultimate 64 updated
dual monitor display

not the latest drivers for vid card. definitely not a cooling problem its freezing in the room i play in like 3-4 celsius I figure a 1000w should be enough for one 470. Have been playing Blackops for hours no problems. WOW no problems for marathon sessions. Seems to only happen with this new game Im playin.. Any suggestions

Have you run Prime95, memtest and Furmark on your PC? The IC (i.e. CPU) are characterized from -40C to 125C with some even higher. The PSU should be generating enough heat from within. As long as there is no condensation inside the PC hardware and PSU it should be fine.

Record the last temp of the CPU and GPU just before it reset/reboot. The important thing is DIE temp not the outside temp. Part of the game may be driving the GPU to heat up in very short period. Similar to the STARTCRAFT GPU over heating issue. This is just an speculation.

Is there a specific segment of the game that it reboots?

Have you check for a patch on the ARMA 2 game? That is looking at it as software related bug.

1000w would be fine, except that the tt tr2 is trash (ok thats a little bit of a stretch to call it that, but its probably no more than a 850w psu...

but yeah, try testing the memory, and make sure before troubleshooting put everything youre overclocking (if applicable) back to stock speeds...

Also Im not receiving BSOD its just a straight up reboot. Also running dual displays. Going to try turning one off to see if this helps at all.

There is no BSODs. It just straight up reboots. Occured again with dual monitor unplugged.

Problem Im facing is I dont have an optical drive installed or an old floppy to use for memtest.... Is there anyway to use a usb drive to run memtest? Also how do I check the PSU? I used OCCT but it doesnt seem to test my PSU at all.

The one that says Auto installer for usb key.
http://www.memtest.org/#downiso

OCCT has a psu test, one of the options on the left, and a gpu test for some cards.
When you say you used it did you run a full 1 hr test and what temps did your cpu hit.

If it passes OCCT anf 20 hrs of P95 I doubt its the memory, but still try memtest.

Going to take out my PSU and replace it tomorrow. Hoping that solves the problem.

Ran OCCT for a couple hours with no problems..

Ive had about 6 of these random reboots at this point. Is this going to damage my system? How do I know if any damage has been done?

Clean driver install for video drivers. Same problem after running ARMA2 for a few hours. Replacing PSU tomorrow with corsair-ax850 gold series. Hoping this solves my problem. Still finding it hard to believe a brand new 1000 w thermaltake PSU is causing this problem. Crossing fingers.

Hey.. What a helpful forum. Yes I believe its under warranty still. All the main components are about a month old. Got lucky that the place I bought it has extended coverage over the holidays. Im still perturbed that this TR2 1000 w is having these issues. No I have no tested my WD drives. Ive had them for ages and I highly doubt theyre at fault. Ill check when I get back with my new PSU. Had OCCT running for a couple hours. The GPU was at 91 and so I feel its not at fault either.

After running for a couple weeks with no problems at all its safe to say that thermaltake makes garbage. Never buy a thermaltake power supply. My new corsair is amazing. Problem SOLVED thanks for the help everyone

Where did you guys get your info on the TR2 from? JohnnyGuru has not reviewed one and his toughpower reviews are real good.

Do you guys think I did any damage to my system from the 6 random crashes that occured? Or the fact that my gpu was underpowered as well as the rest of my machine???