Hello Toms Hardware! (Long time reader, first time poster/account)
Well, I recently purchased a new PC for gaming specific reasons. (Upgraded from a Q6600/HD6670 Combo)
While this new PC should be all lovely and run games quite well... it doesn't!
After about 3 minutes of game play my fps will drop down to near unplayable levels and after about 15 seconds it will shoot right back up; and then the whole process repeats.
For example: Saints Row 3 runs at 55-70 fps on max, and then suddenly drops to around 15.
This has happened ever since I first turned on the PC, and I have no idea whether its the PSU,CPU or Motherboard!
being a student, this has been very costly for me, and I am really frustrated as to why it is doing this.
AMD FX-8150 CPU
HIS ICEQ HD 7850 2Gb TURBO
8Gb DDR3 RAM (Dual Channel)
MSI 760GM-P21 FX Motherboard
750w Powercool PSU
I would get a better power supply, chances are it can't supply the amps (not necessarily the watts) and so the card is throttling itself back.
Get a power supply (500w ish) from a decent manufacturer such as corsair, seasonic etc. You don't need more than that for this build and besides even if it isn't the power supply that thing will explode in a couple of months/weeks and take most of your system with it. That will be much more expensive
Its not overheating then, but something is not stable to cause the prime 95 crash. I suspect its the power supply but it could be the RAM or CPU. Try running prime 95 and the OCCT GPU test at the same time if it is the PSU then this should cause a crash very quickly.