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PCIE 2.0 x16/x4 crossfire

post #1 of 15
Thread Starter 
My board has an x16 pcie2.0 and an x4 pcie2.0

would crossfiring two 6850s on this configuration yield terrible results?
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post #2 of 15
They wouldn't be terrible but they definitely would be a bit of a disappointment.

I say wait until BD hits, then get a BD cpu and a new board with 8x or 16x CF support.
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post #3 of 15
While not Crossfire, [H] tested SLI @ x4 2.0.

Quote:
Therefore, if you are on an aging PCIe 1.X system at x8/x8 mode (equivalent to PCIe 2.0 x4/x4) on a single display fear not, you are not holding back the performance of GTX 480 SLI or we guess with any CrossFireX or SLI configuration.
post #4 of 15
A ASRock 890GX PRO 3 from your sig has only one PCIe X16 slot and is not CF capable..


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post #5 of 15
Thread Starter 
Quote:
Originally Posted by KingT View Post
A ASRock 890GX PRO 3 from your sig has only one PCIe X16 slot and is not CF capable..


CHEERS..
http://www.asrock.com/mb/overview.as...Specifications

it has bro

So an x4 slot pcie2.0 slot is okay with crossfire performance?

This is my first time with this bandwidth thing
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post #6 of 15
You're fine for bandwidth.
Edited by That Guy - 8/4/11 at 7:59pm
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post #7 of 15
Thread Starter 
Quote:
Originally Posted by That Guy View Post
Your fine for bandwidth.
I've heard that the scaling for the 6xxx cards can go up to 90% so with this kind of configuration how much should I expect and is it worth the extra heat and power consumption?
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post #8 of 15
Quote:
Originally Posted by duhurrmien View Post
http://www.asrock.com/mb/overview.as...Specifications

it has bro

So an x4 slot pcie2.0 slot is okay with crossfire performance?

This is my first time with this bandwidth thing
Sorry dude, I was talking about 890GM Pro 3 model.


Yes it would work without any significant performance hit..

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post #9 of 15
I've ALWAYS had problems with crossfire in an x16/x4 configuration when I was on my old 1156 build using a P7P55D. In many games I had to turn crossfire off otherwise it would lag/stutter a bit.

I have never had problems since upgrading to my RIIIF.
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post #10 of 15
It should be fine for dual crossfire scaling, albeit with some loss. It's triple GPU configurations that suffer from a device on 4 lanes. The 1156 benchmarks come to mind, where the gpu to gpu bandwidth wasn't expanded with an nf200 controller. I remember near across-the-board negative scaling under such configurations.
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