How many GPU's fit in a HP 820?

[Paul J Steinberg]

I'm interested in getting a HP 820 and am spending a lot of time on the websites looking at available slots. For Resolve I'd like to drop in a Quadro 4000 for GUI (also used by ScratchLAB and Adobe CS6) and then 2x GTX580 cards for rendering. In theory there are 3x 16 lane slots for the GPU's and an 8 lane slot for the Red Rocket but the 580's are double thick cards and I can't find a photo of the motherboard anywhere to see if they'll fit.

Can anyone with an 820 confirm if I'd be able to wedge all those cards in there?

Cheers!

[Jonathan S Strauss]

This is a bit off topic but just wondering why you chose the PC route over mac now that you can use the GTX 570 and 580 series in the mac? I setup resolve units (both pc/mac) and have found that the mac units, even slower processors, run the program quite a bit better with the same graphics card. With the GTX 570 2.5GB we get 4k playback without a problem on a 2.93GHZ 8 core. I would even suggest the cubix route if you are looking for serious ray trace rendering with 3-4 GTX 580 OC's and a good mac pro.

2nd. Why the Quadro 4000? When I mix a quadro and a gtx series card I tend to get worse performance. For a GUI card just get the cheapest card available. Resolve 9 also does not require a GUI card anymore as you can go directly from your processing card.

[Paul J Steinberg]

I think I found the answer in the Resolve build configuration guide. Looks like the Z820 motherboard's x16 PCI slots are only single spaced so only two GPU's will fit in there. Might go with a Supermicro workstation instead, they have double spaced x16 slots so 3 GPU's fit in the case without any problem, no need for PCI extender.