PCIe x16 gen 3 vs gen 2 for RX 580 CrossfireX

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Stumpy122

Stumpy122

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Mar 26, 2017
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Hi guys!

I was wondering if PCIe gen 3/gen 2 would affect crossfire performance.
If the "primary" graphics card would be in the first PCIe x16 (gen 3) slot, and the "secondary" graphics card is in a PCIe x16 (gen 2) slot, will it perform worse than a CrossfireX setup where all the PCIe slots are gen 3?

In my opinion, it would logical if it would, because an RX 580 needs a gen 3 slot. But hey, multi GPU setups are weird, and have surprised me before.

Also, I was wondering how much PCIe lanes a Ryzen 5 1600 supports.

If it helps, these are my two motherboard options:
1. MSI B350 Tomahawk https://pcpartpicker.com/product/Y4kwrH/msi-b350-tomahawk-atx-am4-motherboard-b350-tomahawk
2. MSI X370 SLI Plus https://pcpartpicker.com/product/vwvZxr/msi-x370-sli-plus-atx-am4-motherboard-x370-sli-plus

If you have an answer, let me know.
 
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TheMacke
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TheMacke

TheMacke

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Jun 2, 2017
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Heyo

No, PCIe bandwidth won't be a problem when it comes to graphics cards. Even a 1080TI won't be bottlenecked by a PCIe 2.0 16x slot. Crossfiring the RX 580's shouldn't be a problem. I would however recommend that you buy the best single GPU instead of two weaker ones. This is because not all games support crossfire/SLI, and you'll generally encounter less problems with only one GPU.

And to answer your second question; a Ryzen 5 1600 has 24 PCIe 3.0 lanes. All Ryzen processors (this far at least) have the same amount of PCIe lanes.

(Just a side comment: PCIe 2.0 16x is the same speed as PCIe 3.0 8x. As I said, neither of these will bottleneck any GPU currently on the market)
 
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J

jaslion

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No worry's about bottlenecking however do not do crossfire or sli as support is being dropped hard and a lot of games don't support it or even perform worse with 2 gpu's get a single better gpu for the price of the 2.
 
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Stumpy122

Stumpy122

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Mar 26, 2017
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Hi!

Thanks for replying! I know what I need to know now.

By the way, I understand why you would recommend a single faster graphics card over two slower ones, but I'm doing this in terms of upgrading. I'm starting off with just one RX 580, and then I will (as soon as I get enough money) add another. But looking at the games that support multi GPU setups (or rather, the lack of them), I will probably just stick to a single GPU. I'm only gaming at 1080p anyway and one RX 580 is already pretty good a 1440p, so just one will last me more than long enough.
 
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