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Effects of x16 GPU in x8 slot

 
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post #1 of 6 (permalink) Old 03-05-2019, 04:47 PM - Thread Starter
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Effects of x16 GPU in x8 slot

I'm trying to consolidate the function of 2 of my computers to one but I'm running into some hassles and wanted to get opinions on a couple things.

My primary computer is an i7-4790k with 16GB of RAM and an R9-390X GPU. I use it for typical things along with some occasional gaming like CS:GO, Doom, Kingdoms of Amalur, etc. I also work from home via a VMware VDI session on this computer.

My second system is a workstation class built around a Xeon E5-2690v2 with 128GB of RAM (10c/[email protected]) and a Supermicro workstation board. I use it primarily for VMs where I test and play with various things that interest me but also for testing upgrades and changes to my "production" VMs that I use for my home network and lab.

I'm hoping the Xeon system can do everything I want if I moved the GPU to it, but then I discovered the R9 is a 2.2 slot card which interferes with other expansion cards I have in that system and also derails my plans to add some other things. My planned additions are an Intel dual port 10g NIC and a 1.2TB Fusion IO PICe SSD.

So, I have a spare Supermicro X9SRL-F server board I can use that has plenty of slots for everything including the other cards I want to add. The catch is it doesn't have any electrically x16 slots. Its two x16 slots are only x8. I know I'll have to add expansion cards for USB3 and a sound card.

My first question is, for my use case, will the Xeon at only 3.3 Ghz be an issue for the games I play?

Second, how much will an x8 slot bottleneck my GPU and will it actually be noticeable?

Last, does any of that change if I upgrade to an Nvidia 2060 or 1660 and try Metro Exodus, Anthem, or other newer games?
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post #2 of 6 (permalink) Old 03-05-2019, 05:09 PM
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In case of 390X you'll lose like 3-7FPS total, checked that on my 290X 4GB, can't remember which title I've tested.

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post #3 of 6 (permalink) Old 03-05-2019, 05:23 PM
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Titan X Performance: PCI-E 3.0 x8 vs x16 https://www.pugetsystems.com/labs/ar...x8-vs-x16-851/

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post #4 of 6 (permalink) Old 03-05-2019, 05:33 PM - Thread Starter
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So, according to that link plus another one I found I don't think the slot will make a difference. https://www.gamersnexus.net/guides/2...impact-on-gpus
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post #5 of 6 (permalink) Old 03-05-2019, 06:04 PM
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No it won't make much difference.

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post #6 of 6 (permalink) Old 03-05-2019, 06:31 PM
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I have a 1080 in an x16 slot that's stuck running 8x, still gets the results you'd expect.
Having a 3Ghz CPU isn't ideal but you have enough cores that in modern games you should be fine, faster would be better but still probably pretty good.
It really depends on how you play games.

If you play 4k with high settings the CPU might give you 1% less performance than a 9900k.
If you play 1440p with higher framerates the CPU's speed will hold you back some but still pretty good.

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