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Ask the Experts Question: Does using the 8x slot for SLI effect performance at all?

Question asked by Ovidiu from Romania | | Motherboards Content | Posted:
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Hello,

 

I have a system with the following setup : AMD 955BE CPU, 4GB RAM, 850W PSU and an ASRock M3A785GXH/128M motherboard that has 3 PCIe slots.

 

One is 16x, the other is 8x and the last is 4x.

 

If I were to do a 2-way SLI setup with a GTX 660 (using the x16 and x8 slots), would the 8x slot impact performance?

 

For the moment I'm using a 1680x1050 monitor and in the future I am not planning on going any higher than 1920x1080.

Hi Ovidiu,

 

There are some benefits to using 16x slots on the motherboard for multi-GPU setups, but the difference is only a couple of percent. You might see a 2-3% increase in performance using 16x/16x, but it's not going to noticeable for multiple reasons.

 

TweakTown image asktheexperts/1/1/111_03_does_using_the_8x_slot_for_sli_effect_performance_at_all.jpg

 

First, 1680x1050 is going to be a huge limitation for any multi-GPU setup, and secondly, your CPU will be a limitation in any multi-GPU setup. I would go ahead with the 8x/8x SLI solution and not worry about it, you'll be fine.

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