2U Server with Full Size PCI Express x16 Graphics Card

I need to build a 2U Server with a full size PCI Express x16 graphics card. I would assume this would mean the x16 slot needs to be on a riser card so that it can sit horizontal in the slot. I am having a very hard time finding a combination which offers this. Could anyone point me in the right direction? I had hoped to order everything through NewEgg so if you could find a compatible system through them that would be ideal! I fear my ignorance is making this more difficult than it needs to be :)
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Rear view shows slots are sideways.  The pictures only show screws, standoffs, PSU, and power cable.  So, you'll need to call to see if they have one available separately for the slot you need.

The OEM's description is rather sparse also:  http://www.athenapower.us/products/rackmount/rm_2u2042l.htm
shawnlehnerAuthor Commented:
I have found a few cases with horizontal expansion card slots but I am having trouble finding a motherboard that has a PCI Express x16 slot on a riser which will work with those cases....
The slots aren't "on a riser".  You plug a riser adapter into a standard slot.

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Search for an PCI-E 16x riser card shows plenty of hits:

Maybe times have changed, but unless cards were already installed at the factory, I had to plug in the riser and cards myself.
shawnlehnerAuthor Commented:
But what I am saying is depending on which slot you are putting the riser in isn't that going to screw with how it sits in the case? IE if the slot you are putting the riser in isn't at the base of where the horizontal cards start isn't that going to not mount correctly? For example we have a pre-built Supermicro server that we got years ago... it has horizontal card slots (PCI) and it came with a special riser which rose all the cards up and to the side... since you would be covering the other slots if you didn't... I dont see how this could match up with the case if you just through a riser into an arbitrary slot...

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I see what you're saying.  When I was making DIY, they were 1U pizzz boxes, so only 1 riser, 1 card.
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