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Am I doing something wrong with crossfire?

TheLegendOfMart

TheLegendOfMart

TheLegendOfMart

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Am I doing something wrong with crossfire?

I have 600W PSU, 2x 2GB 7850, core i5 2400 @ 3.6GHz, 16gb ram, 128gb ssd, etc..

Nearly all games I get better performance disabling crossfire and running just a single card and either card runs fine on their own.

Running Windows 8 with 13.8 Beta 2 drivers.
 
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You could be running into a CPU bottleneck. What games are you playing and have you monitored your GPU utilisation? I suspect you'd see with one card you're up at 99% while with two you might be dropping down as low as 60-70%.

If you want to check that crossfire is working correctly try one of the synthetic benchmarks, 3D Mark would be a good choice, and see if your graphics score scales accordingly between one and two cards being used.
 
Although he'll be getting a bottleneck with that i5, it won't be crippling. You're just losing some performance. Are you sure crossfire is enabled in CCC? Have you disabled ULPS? What games are you having problems with?
 
Is a sandybridge at 3.6GHz really a bottleneck?

I have 600W crossfire certified PSU and ULPS is disabled, neither of them are overclocked and are the exact same model

I have uninstalled, cleaned and reinstalled latest 13.8 beta 2 drivers.
 
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TheLegendOfMart said:
Is a sandybridge at 3.6GHz really a bottleneck?

I have 600W crossfire certified PSU and ULPS is disabled, neither of them are overclocked and are the exact same model

I have uninstalled, cleaned and reinstalled latest 13.8 beta 2 drivers.
Click to expand...

What games are you playing and what settings are you using? Is frame pacing enabled in CCC?
 
TheLegendOfMart said:
Is a sandybridge at 3.6GHz really a bottleneck?

I have 600W crossfire certified PSU and ULPS is disabled, neither of them are overclocked and are the exact same model

I have uninstalled, cleaned and reinstalled latest 13.8 beta 2 drivers.
Click to expand...

A sandybridge what? i5, i7? I assume i7..:)

600W is quite low for 2 GPU's.
 
I had the exact same problem as you, do you have identical cards? I did have a ref 7970 and HIS 7970 and had the chance to match the HIS for my ref and then:
I uninstalled everything to do with the GPU (All the drivers, MSI Afterburner, RadeonPro etc) Reseated the crossfire bridge too
Reinstalled everything again starting with the driver

Might not make a difference but it certainly worked for me, i do have bottleneck but now i have crossfire performance

Good luck
 
Yeah they are both the exact same make and model.

I've tried swapping them round, turning the bridge round, uninstalling, cleaning and reinstalling drivers, etc..

What annoys me is that they run great on their own.

It may be a bottleneck or my motherboard is just crap.
 
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Yeah tried 13.6 Beta 2 after the usual uninstall and clean.

Tried both cards again on their own, getting capped 300fps in CS:GO, soon as I enable crossfire the FPS is all over the shop.

I was warned off crossfire but I thought I knew better.....
 
Try 13.4 WHQL drivers?
I had a nightmare too but i got through it.
If it gets too much for you just sell up and go green
I actually enjoy fixing problems even though i wanna pull my own hair out
 
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