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I currently have a GeForce GTS 250 in my computer, I am replacing it with a GTX 770 (it's a big upgrade). Is there any reason to keep the GTS 250 in my computer in the second PCI Express 16x slot?

I was thinking to use it as a dedicated PhysX card (You can set that up in the Nvidia Control Pannel, the new card is still in the mail so I don't have it hooked up yet) but I did not know if there is any kind of "as slow as its slowest componet" thing I should be aware of that could cause my GTX 770 to slow down.

Will keeping my GTS 250 has a PhysX card help me, hurt me, or do nothing at all?

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    It will keep dust from getting into the slot.
    – EBGreen
    Jan 13, 2014 at 15:48
  • What are you running that's using PhysX?
    – ernie
    Jan 13, 2014 at 15:50
  • @ernie I thought it was common for modern games to use that for their particle effects.
    – Scott Chamberlain
    Jan 13, 2014 at 15:50
  • I'm not 100% positive, but I would guess the settings in the Nvidia Control Panel allow to use PhysX for other types of computing (i.e. mining bitcoin), not necessarily video rendering.
    – ernie
    Jan 13, 2014 at 15:52
  • PhysX is for Physics (notice the play on words) simulations in games. What you are thinking of is OpenCL.
    – Scott Chamberlain
    Jan 13, 2014 at 15:57

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There's no "technical" limitation to this as Windows will ask which card is the primary one and will use that for all intents and purposes unless you tell it otherwise through Nvidia's control panel.

However, I don't see the point of keeping an old card that will just contribute to heat and power draw of your system. Dust can be reduced by covering the hole in the case (if you have one), but even older GTS cards do produce quite a bit of heat. Also, there's no purpose (as noted in the comments) to having a "dedicated" PhysX card since the high-end cards nowadays will out-perform them while being more energy and heat efficient.

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  • I think the question is more "Willl using it as a Phsyx only card will increase performances by reducing the mainc ard's load, or will it reduce them because it's slower?" which you don't answer imho.
    – mveroone
    Jan 13, 2014 at 16:39
  • @Kwaio Ah yes...modified my answer
    – Nathan C
    Jan 13, 2014 at 16:41
  • Good enough explanation for me. I am just going to leave the old card out.
    – Scott Chamberlain
    Jan 13, 2014 at 16:44
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    Waste of power, can tip the balance if your PSU is on the edge.
    – Fiasco Labs
    Jan 13, 2014 at 16:59
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Your new GPU will handle everything, rendering your old GPU pretty much useless. In addition to extra power usage, not to mention which will generate heat, there is another issue regarding PCI-Express x16: If your motherboard have shared PCIe x16, when you install two GPUs, each will use 8 lanes instead of 16, which will reduce the performance of your primary GPU. There is not much point in keeping the old GPU in the system.

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In fact it could be useful to have two GPU in system but only if you are interested in GPGPU. With one card it's impossible to debug CUDA kernels because when you create break point in graphic computation you will hang your UI (although latest NVidia cards support debugging on one device)

I used to have 2 GPUs in the system and I use one for computation and second for display UI. This allow me to use all avaliable memory and create proper benchmark results.

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