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Using dedicated physx card on pci-e 2.0 x1?

Last response: in Graphics & Displays
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July 8, 2013 4:34:41 AM

Hi what are the potential bottlenecks of using a gt640 as dedicated physx card in pci-e 2.0 with x1 bandwidth? Would you recommend it?

My motherboard is a asus p8h61-m pro and i would be using a gtx 770 as my main gpu in the pci-e 2.0 x16 slot.

Thank you
July 8, 2013 4:47:55 AM

you need a 4x port to run i never see anyone using a graphic card on 1x pci-e
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July 8, 2013 5:03:00 AM

So will it work? If so what would be the bottleneck if used only as a dedicated physx card?
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a b U Graphics card
July 8, 2013 5:17:58 AM

Erhmm it's a good question. I found this old benchmark showing that dedicated physX on a PCIe isn't that bad in performance drop



Have no idea how that would look like in a up to date benchmark.
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a c 595 U Graphics card
a b V Motherboard
a c 388 Î Nvidia
July 8, 2013 11:21:14 AM

You might be able to draw some conclusions from this chart. There isn't a lot of information on the topic. You will lose out on some performance with the x1 PCIe slot, but it's hard to say how much.

http://www.tomshardware.com/reviews/nvidia-physx-hack-a...
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a c 595 U Graphics card
a b V Motherboard
a c 388 Î Nvidia
July 8, 2013 11:25:02 AM

A link to the page with the chart shown above by Mahisse. It looks like there isn't any real major drawback to using the x1 slot. Be sure you actually play some GPU-accelerated PhysX games before you even attempt to set it up.
http://physxinfo.com/news/880/dedicated-physx-gpu-perfo...
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