Possible CPU Bottleneck?

Jordan141 · Oct 11, 2014

Ok, so I recently purchased + installed an addition R9 290X in my rig in order to crossfire it with my other 290x however I've noticed little/no performance increase when crossfiring it, despite knowing 100% that the crossfire is working due to the icon pop-up when I load the games I play. So after being faced with this incredibly frustrating problem I began looking around to see why and was told that what was causing my second card to barely make any difference was due to my CPU possibly bottlenecking my GPUs. So before I think about buying a new CPU I was just wondering if anybody here could help me out by confirming whether or not it is my problem.

My CPU/GPU is:
i5 2500k 3.3ghz (quad core)

two R9 290x's (4gb ddr5 vram)

Thanks!

Dunlop0078 · Oct 11, 2014

What games are you playing? Most games have very bad (or none at all) crossfire support.

ifreestylin · Oct 11, 2014

First of all what games you play? Overclock that CPU! why do you even have it at stock? Whats you GPU's and CPU usage like when playing games?

Jordan141 · Oct 11, 2014

Dunlop0078 :

Well I've tried a few games, both of the Metro games, pretty heavily modded Fallout 3, Far cry 3, all of them seem to have crossfire running in them but with no performance gain.

Jordan141 · Oct 11, 2014

ifreestylin :

I've tried a bunch of games, all of them appear to have crossfire running( Both Metro games, heavily modded Fallout 3, Farcry 3), even when I'm using crossfire both GPU usage is ~70-100% and when I drop one of them I don't drop any frames and CPU core usage is around 40-70% but each core varies a little.

ifreestylin · Oct 11, 2014

Jordan141 :

Try to disable ULPS

http://www.tomshardware.com/faq/id-1904869/disable-ulps-amd-crossfire-setups.html

Dunlop0078 · Oct 11, 2014

Jordan141 :

Yah i dont think any of those games have very good crossfire support i doubt fallout 3 has any. But i would think there should be some performance gain in far cry 3 and metro if only a little. A game like bf4 is where it really makes a difference.

Jordan141 · Oct 11, 2014

ifreestylin :

Jordan141 :

Try to disable ULPS

http://www.tomshardware.com/faq/id-1904869/disable-ulps-amd-crossfire-setups.html

That actually gave me a slight performance boost ( around 4-5 frames ) so thanks, but I've just tested FC3/Metro and I'm still unable to reach 60fps on high

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