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My Motherboard - Gigabyte GA-880GM-USB3. It has onboard graphics ATI Radeon HD 4250.

I have a spare GPU - GeForce 8400GS 512MB DDR2 and I was wondering if I shall add it to my system. The only reason I'd add is when both the cards are processing the graphics. So will it happen?

I am aware that my motherboard has some technology named CrossFireX for using multiple GPUs, but will GeForce's work here?

  • No; Crossfire is not compatible with Nvidia products. – Ramhound Oct 14 '14 at 19:09
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No, they won’t. These features are vendor-locked, for course.

I (personally) think the performance gain (over just having a dedicated graphics card) is rather questionable. I don’t have any benchmarks handy, though. Having a single graphics card still provides the least problems and best compatibility.

  • I can tell you that mixing a built in and GPU and dedecated Nvidia GPU would result in an either situation they won't combine like the author believe – Ramhound Oct 14 '14 at 19:30
  • Both NVIDIA and ATI offer solutions for achieving what the OP wants: Hybrid SLI (semi-discontinued) and Hybrid Graphics (apparently, “Dual Graphics”, now), respectively. Naturally, different vendors don’t combine. – Daniel B Oct 14 '14 at 19:35

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