Ryzen 2400: will the GPU part of the APU still be usable for compute if I have a discrete graphics card installed?

Solution 1:

to say these response are BS is an understatement Ryzen 2200/2400 ave available pci-e 3.0 x8 link speed available that can be used for external graphics (if one so chooses) it is not easy to do so by all means, but claiming it is not possible is not at all truthful.

AMD made sure there was a limit so you could basically only pair up with 1 GPU so potential miners would not even bother using as such.

Ryzen 2200/2400g with a x8 link speed is basically enough bandwidth leftover to feed any current single gpu from AMD or Nvidia up to about Titan V or possibly some dual gpu on 1 card configurations.....they really should have given the ability to disable the Vega graphics core to shift between the iGP and dGPU as needed, maybe this will come with BIOS updates, however, like I said and I have been spending quite a few hours researching this for my own information, you ABSOLUTELY can pair up Ryzen 2200/2400G with a discrete graphics card.

there is a limit of 1 gpu however, so if your plan was to use it for mining, likely the cost would just not be worth the attempt, better off to get something like a Ryzen 1200 and a full size x370 or something like that (more pci-e slots)

anyways ^.^

Solution 2:

As of now, Ryzen APUs won't coexist with GTX1080Ti^[1], GTX1050^[2], GTX1050Ti^[3], RX580^[4][5] and Vega 56^[6].

Even if it is fixed with updates from AMD, Ryzen APU only has 8 PCIE3 lanes for dGPU^[7], eg. PCIE3 lanes are split x8/x0 instead of x8/x8 (see detail pane of spec). You'd need an adapter to fit extra dGPUs, as per your intent to run 3 dGPUs in 1 rig.