1 PCI-Express x16 slot on the A6123W and A6113W, so that video card will fit. If you want to upgrade your power supply, you'd better ask in a more specific forum, if you need an upgrade at all, power supplies are not the weakest link in a HP.
I will get a larger power supply. I will need it. Also another fan. I just hope the Video card will fit well in the case. HP support said it should be no problem. I hope there right.
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