PSU freaking out underload (gaming)

[Lezenko]

Hey guys I recently purchased a Radeon 6850 and along side it a Coolermaster Elite 500.

First day everything was fine up until the evening.

Anytime I run a game (only a game, 3D Applications/Renderings are fine) the PSU fan goes nuts for around a minute, then it slows down.. then after 3 minutes of being calm it does it again. Im just wondering if its safe thats all.. dont want to risk anything.

Specs are as follows:

Radeon 1GB HD XFX 6850
AMD X3 Triple Core at 2.9gz
300Gb HD
4Gb Corsair Ram
3 USB devices
Coolermaster elite 500w PSU Link http://www.cclonline.com/product/58931/RS500-PSARJ3-UK/Power-Supplies/Coolermaster-Elite-500-Power-Supply-OEM/PSU0231/

Cheers for any replies, Luke

 

[EXT64]

You are certain it is the PSU fan, correct (not the GPU)? Strange, as those are usually temperature controlled fans I thought.

 

[Lezenko]

Yeah im more than positive. Ive stopped the GPU fan, the CPU fan underload and they are fine, the only culprit left is the PSU but i cant exactly test it due to its lay out but id bet my life on it

 

[henydiah]

Swapped PSU like good Idea, for healty hardware you need upgrade to PSU pure / true power from brand Seasonic/corsair/XFX/anteq/ etc , Coolermaster elite 500w PSU is bad