Freezes but only with 3D accel

[ceenvee703]

Just made a homebuilt system and have been having the problem described in the thread: the system is nice and stable when I'm not doing anything requiring acceleration, but when I'm playing a 3D game or doing video encoding that uses the GPU, I will get random hard crashes. Not every time, but often enough to be borderline unusable.

System:

Intel DZ68DB motherboard
Intel Core i5-2500K 3.3GHz
Two 4GB(2GBx2) DDR3 1600 Kingston RAM
EVGA GeForce GTX460
500GB boot drive (SATA, don't have make/model handy)
Samsung SATA Blu-ray drive
Windows 7

Things I've tried:
Ran Memtest 86 -- RAM checked fine after 5 passes
Got a replacement motherboard from the vendor: same behavior
Updated motherboard BIOS.
(At first I thought that had fixed it, and it may have decreased the frequency of crashes, but it still crashes.)
First I just used motherboard video and QuickSync for acceleration, but I'd get freezes. Hoping to just work around the problem, I bought the GTX460. Similar crashes.
Added a CoolerMaster Hyper 212 Plus. Runs a lot cooler, but still crashes

Does this ring a bell? What else can I try? About the only thing that I haven't swapped out is the processor, which would be an expensive swap.

Thanks!

 

[mcnels1]

Just made a homebuilt system and have been having the problem described in the thread: the system is nice and stable when I'm not doing anything requiring acceleration, but when I'm playing a 3D game or doing video encoding that uses the GPU, I will get random hard crashes. Not every time, but often enough to be borderline unusable.

System:

Intel DZ68DB motherboard
Intel Core i5-2500K 3.3GHz
Two 4GB(2GBx2) DDR3 1600 Kingston RAM
EVGA GeForce GTX460
500GB boot drive (SATA, don't have make/model handy)
Samsung SATA Blu-ray drive
Windows 7

Things I've tried:
Ran Memtest 86 -- RAM checked fine after 5 passes
Got a replacement motherboard from the vendor: same behavior
Updated motherboard BIOS.
(At first I thought that had fixed it, and it may have decreased the frequency of crashes, but it still crashes.)
First I just used motherboard video and QuickSync for acceleration, but I'd get freezes. Hoping to just work around the problem, I bought the GTX460. Similar crashes.
Added a CoolerMaster Hyper 212 Plus. Runs a lot cooler, but still crashes

Does this ring a bell? What else can I try? About the only thing that I haven't swapped out is the processor, which would be an expensive swap.

Thanks!

Random crashes under load can be due to power supply problems.

 

[ceenvee703]

Random crashes under load can be due to power supply problems.

Thanks for the reply, should have mentioned I got a brand new 750W Corsair 80 Plus power supply to go with the system. Is there any way to know it's the power supply beyond swapping it out for a new one?