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PCI-E 2.0 running 3.0 card

Quick question, I have a 7870, which is PCI-E 3, but my motherboard (ASUS P7P55D EVO) is only PCI-E 2. Will this be affecting the performance of my card?
Click to expand...

Less than 1% difference
 
Kaapstad said:
Less than 1% difference
Click to expand...

Not even less than 1%. ;) I would say zero difference with that card you have, check below with the top end cards.


Ivy Bridge PCI-Express Scaling with HD 7970 and GTX 680

In this review, we test the impact of running the AMD Radeon HD 7970 and the GeForce GTX 680 on Intel Ivy Bridge PCI-Express slots that are electrically PCI-Express x16, x8 and x4. We tested all three generations of the PCI-Express interface: 1.1, 2.0 and 3.0.

http://www.techpowerup.com/reviews/Intel/Ivy_Bridge_PCI-Express_Scaling/
 
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Before you would see a difference you would have to saturate the PCIE2 lane which is impossible using any single card solutions available today.

I think this is right, someone else here might know better, but:

1x16 PCIE2 lane is 8GB up and 8GB down.

So to saturate it and create a bottleneck, a graphics card would need more than 8GB of onboard RAM.
 
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