Haven't bought anything yet. Idea is to pull graphics card, insert one x8 dulce systems host adapter and one x8 small tree 10Gbe card. Then manage server and RAID remotely. Any body run a a mac pro server headless with two x8 cards, or used riser cards with the two x4 slots? I called apple and they have yet to get back to me.
in my server, i have 2 ATTO R380 cards in slots 1 and 2, and 2 4port Small Tree ethernet cards in slots 3 and 4. i use a Newertech USB to DVI adapter to connect to a 24" Dell monitor. no real issues. it can't do anything graphics intensive, but it's a server, so it works fine.
if you ever need to do a OS reinstall, which i just did last week, you have to put the original GFX card back in. after it's setup again, you can pull the GFX card.