The video codec support seems to be better supported and longer lived in AMD cards the same age as nVidia cards. Therefore the HD6450 should be better for video playback. You need a 610 or so in nVidia otherwise.

edit: though if you have not yet acquired the cards to go with these then HD8570 or quadro K620 would be better future proofing for about $20 if you look around and snipe wisely, vs $15 of the other cheapie basics.

editII: actually they're a bit cheaper than when I last looked there's some fleabay HD8570 for sale at 7.99 USD on low pro brackets seller has 6 left.

EditIII also seeing a lot of 10 for $56ish if you need that many.

Don't need many. I have the 8400s already. May buy a few 6450s. I can at least.offer video output if I sell those crap mobos. I tried the msi nx8400gs-td256e cards in a somewhat modern xeon box. It's performance beat the snot out of the onboard Rage XL clone circuitry. Which wasn't saying much. But video playback was certainly acceptable.

The Windows 7 driver worked well under Windows 10. I hope the ATI cards are as convenient. Can't see why not.

Opps hd 3450. 256mb, same as gt 8400gs.

So it doesn't necessarily make a differemce which manufacturer you go with? Was told by some yokel it's best to pair intel w/invidia, and amd w/amd.

It makes sense in some circumstances, when you can match the generation of the AMD graphics to the inbuilt basic graphics in the APU or chipset, then you can get a few extra graphics EUs glommed together to get asymmetric crossfire, but basically all support for that dropped now. Then intel onboard of some generations had better x.264 x.265 decoding than nVidia, so "using up" your nVidia parts on those covered the nVidia deficiencies there. But in some respects there's only a brief year range where you could match "ideally bad" low end bits to other low end bits to make things slightly less bad than if you just guessed.

edit: I mean h.264 h.265 must have been getting brain tangled with modem or network protocols or been reading about VideoLAN's decoder for them named that.