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Somewhat tangential question, but I'm wondering if anyone knows of a solution (or Google search terms for this): I have a 3U supermicro server chassis that I p

Somewhat tangential question, but I'm wondering if anyone knows of a solution (or Google search terms for this): I have a 3U supermicro server chassis that I put an AM4 motherboard into, but I'm looking at upgrading the Mobo so that I can run ~6 3090s in it. I don't have enough physical PCIE slots/brackets in the chassis (7 expansion slots), so I either need to try to do some complicated liquid cooling setup to make the cards single slot (I don't want to do this), or I need to get a bunch of riser cables and mount the GPU above the chassis. Is there like a JBOD equivalent enclosure for PCIE cards? I don't really think I can run the risers out the back of the case, so I'll likely need to take off/modify the top panel somehow. What I'm picturing in my head is basically a 3U to 6U case conversion, but I'm trying to minimize cost (let's say $200 for the chassis/mount component) as well as not have to cut metal.

choppaface 3y ago
Comino sells a 6x 4090 box as a product: https://www.comino.com/ https://www.comino.com/ They have single-slot GPU waterblocks but would want something like $400 or more each for them individually.
ftufek 3y ago
You'll need something like EPYC/Xeon CPUs and motherboards which not only have many more PCIe lanes, but also allow bifurcation. Once you have that, you can get bifurcated risers and have many GPUs. And these risers use normal cables not the typical gamer pcie risers which are pretty hard to arrange. You won't get this for just $200 though. For the chassis, you could try a 4U rosewill like this: https://www.youtube.com/watch?v=ypn0jRHTsrQ https://www.youtube.com/watch?v=ypn0jRHTsrQ, not sure if 6 3090s would fit though. You're probably better off getting a mining chassis, it's easier to setup and cool down, also cheaper, unless you plan on putting them in a server rack.

choppaface 3y ago

Comino sells a 6x 4090 box as a product: https://www.comino.com/ https://www.comino.com/ They have single-slot GPU waterblocks but would want something like $400 or more each for them individually.

ftufek 3y ago

You'll need something like EPYC/Xeon CPUs and motherboards which not only have many more PCIe lanes, but also allow bifurcation. Once you have that, you can get bifurcated risers and have many GPUs. And these risers use normal cables not the typical gamer pcie risers which are pretty hard to arrange. You won't get this for just $200 though. For the chassis, you could try a 4U rosewill like this: https://www.youtube.com/watch?v=ypn0jRHTsrQ https://www.youtube.com/watch?v=ypn0jRHTsrQ, not sure if 6 3090s would fit though. You're probably better off getting a mining chassis, it's easier to setup and cool down, also cheaper, unless you plan on putting them in a server rack.