Bah....random reboot...

First of all, hello everyone!
Brand new to the forum but glad to be here.

Having a wee bit of a problem with my build.

Build info:

i7 920 cpu (stock)
Asus P6T6 WS motherboard
Asus Matrix GTX 285 x2
2G Corsair DDR3 1600 RAM x3
Cooler Master real power pro 1000w power supply

HDDs:
All drives are western digital
500gb 32mb (for OS)
750g 16mb
1t 16mb
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The problem:
When I play games (ie: Crysis, L4D) the computer randomly restarts. There is no BSOD, no warning and completely random. Can happen 2-5 minutes into the game play, can happen 30-40 minutes into the game play.
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What I have tinkered with and tried
The RAM i got is a 1600 (and is on QVL for mobo) and, as the mobo says, it can support it in the OC. Dug through some forums and was suggested to just change the ram to 1600 in BIOS, was fine. Then changed the DRAM voltage to 1.64 ( i did 1.64 as I did not like the warning message at 1.65...although supposedly its fine, but still) and QPI to 1.4
Everything was alright.

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What I did to try and fix it.

I am 99.999999% sure it is not overheating...
I have been monitoring the system as that was my first though and while gaming and doing 3d mark test, CPU hovered around 51-60C while GPUs were never above 71C (on Crysis, everything on ultra high). The case is a HAF 922...so good airflow as well...

Computer worked fine, then while gaming randomly restarted, a messaged popped up saying "overclocking failed" I went into BIOS and everything was back on auto. Did some gaming, random restart. Went back into BIOS, set the ram at 1600, clicked f10 to save and exit, random restart as soon as i pressed it...so i thought (aha...bad ram). Went back into bios again, ram was sitting at 1600...i set it to auto, f10....random restarted again as soon as i pressed it. I thought that was very strange so I decided to test the system, gamed.....restart. I thought maybe something up with bios so I updated it and flashed it and set all to default factory. Gamed some more, restarted....I started to get annoyed. I completely reinstalled my GPU drivers, problem continued. At this point I was about 95% there is something wrong with the ram because maybe my tinkering did something to it and also as soon as I touch it in BIOS and attempt to save it, computer restarts. I made sure to change other minor bios settings and then save and exit, and the restart does not happen. Then I thought that maybe when the RAM goes to high frequency it encounters problems...so I set it to 1333 which is also supported by the board and without any OCing....f10....again, restarted. I went back into bios and it was sitting at 1333...

I did a windows memory test which did not detect any errors.
Also performed a directx test on the system...no problem there either.

I also checked the event viewer in windows and at first, it was giving me the following after the restart:
\SystemRoot\SysWow64\Drivers\ULCDRHlp.sys has been blocked from loading due to incompatibility with this system. Please contact your software vendor for a compatible version of the driver.

I got rid of the program which was dealing with the file (it was a Ulead Burn.Now 4.5 SE) thinking it would help..but no, same problem. Now when I view the even logger all it says is that the system was shutdown unexpectedly. (drivers and bios update was done after I uninstalled the software) but...same thing.


I did a memtest...so far it did 2 pass with 0 errors.


Any help or advice would be very helpful...

 

Quick update:
Alright so ran 3-4 passes on each stick separately, all passed no errors.

I went into BIOS changed the dram to 1600, it shut down again and restarted. I went back and made the voltage 1.65 (changed to 1.66) and QPI to 1.4. Restarted and said Overclocking failed and wanted me to go back to BIOS and change the setting...I turned down the voltage to 1.64, saved, restarted (properly this time no shut down) and booted back up...and here I am right now..

 

Official:
As soon as DRAM frequency is changed(be it 1333, 1600, auto, w/e just as soon as its changed), the shut down thing happens. Everything can be messed around with.

I am gonna try to google it or something and see if that problem is present on other mobos


(p.s. sorry I can not find the edit button...and I am sure it;s somewhere right in front of my face too)
p.p.s lol found it. I guess you cant edit after a certain amount of time.

 

Random reboots can be caused by your PSU being to week or defective. Which PSU do you have?

EDIT: I see you have 1000 Watt which should be plenty. My next guess would be the motherboard or one of the gpu's is bad or failing. Does the system reboot when idle?

 

it says in the first post XD
I have a Cooler Master real power pro 1000w power supply.

here is a link to it
http://www.newegg.ca/Product/Product.aspx?Item=N82E16817171022

 

Does the pc reboot when idle or reboot at random playing games or not?

 

What the hell I could have SWORN i replied...

Anyway, yea it happens when I game.

Did not happen so far with 3d Mark, Prime95 or Memtest.
I tried taking GPUs out and trying each one but still no luck.

The thing is, it does THE EXACT same thing when i touch anything in DRAM frequency. As soon as I change it to something that it wasnt before and then click F10 to save and exit BIOS, it shuts-down, sits for a second and restarts. Doesnt matter if the DRAM is beign set to AUTO, 1600, 1333...

Also no BSOD so I do not think its the drivers...

I dunno >.<

If it IS the GPU (because it makes a weird screeching sound when I game..but I read its ok and doesnt damage the GPU) then what does it have to do with DRAM....

 

When you are messing with stuff in the bios including overclocking for the pc to shut off and then turn back on. My two Asus boards do the same.

 

Hmm...alright...
Then I wonder what does it mean if it shuts down and then restarts...