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Sapphire HD 7850 2Gb CrossFire Configuration Showing No Increase In FPS.

Last response: in Graphics & Displays
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April 15, 2014 12:48:16 PM

Hi,

So i've been having some problems getting my Sapphire HD 7850 2Gb CrossFire configuration working.

Specs:

Windows 7 Home Premium 64bit.
AMD FX-8350 Black Edition @ 4.0Ghz (Stock).
ASRock 970 Extreme 3 R2.0 Motherboard.
Sapphire HD 7850 2Gb CrossFire.
16Gb G-Skill RipjawsX 1600 DDR3.
Recom 600W Power Supply.

About 6 months ago i got my second GPU and when turning ON CrossFire i got no increase in FPS.
At the time I was using a Gigabyte motherboad and a AMD FX-8120 and thinking it was a CPU bottleneck issue (that and I was really dissapointed with the performance it provided) I Decided to upgrade to a AMD FX-8350 with a ASRock 970 Extreme 3 R2.0 Motherboard.
After the installation everything was running fine, But still no increase in FPS what so ever.
I tried to overclock the GPU's, nothing happend. i tried to underclock the GPU's, nothing happend and i even tried increasing the power limit to the GPU's (all done in CCC) and what a suprise... Nothing happend.

Please, I really need some help/advice getting this problem sorted.

Best solution

April 15, 2014 1:05:37 PM

Some games won't show much if any improvement with multiple cards over a single one.

Make sure you enabled crossfire in the CCC and have a crossfire bridge connecting the cards.

The best way to know if the second card is working is by running something like 3dmark. Run it with crossfire and without. Then compare the GPU or graphics scores. The score should be about 85+% higher when both cards are enabled vs just the single card.
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April 15, 2014 2:17:47 PM

ish416 said:
Some games won't show much if any improvement with multiple cards over a single one.

Make sure you enabled crossfire in the CCC and have a crossfire bridge connecting the cards.

The best way to know if the second card is working is by running something like 3dmark. Run it with crossfire and without. Then compare the GPU or graphics scores. The score should be about 85+% higher when both cards are enabled vs just the single card.


Thanks, this did actually help, but the increase was only 39%.
On my next build i'll go for a higher end single GPU, shame i had to learn about this the hard way.

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April 15, 2014 5:53:34 PM

That's odd for only 39%. On my system with 2 - R9 290's, I get 83% scaling in 3dmark firestrike.

Even my old 7770's crossfired were getting around 85% scaling.

Sounds like you might have a bottleneck or something else.

You could pull up the activity manager for Windows. Press control + shift + escape on the keyboard, then select the performance tab. Then fire up MSI afterburner. With both of these open, you can launch a game or benchmark and monitor your CPU and GPU usage. On something like 3dmark firestrike, both GPU and the CPU should be at or near 100% usage.
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