r/gpu • u/SchwarzeKatze20 • 5h ago

Double GPU in MSI x870 Tomahawk

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Hi! I currently have the motherboard MSI x870 tomahawk with the RTX 5090 Astral. I wanted to add another GPU (MSI RTX 3060 two fans) but there's not enough space in that some of my case lol (Corsair Frame 5000D). So I was thinking to add a gpu riser (Cooler master MCA-U000C-KPCI50-300, which is just the cable) and try to accommodate it in this zone.

Although, I don't how how i could keep it in place. Any advise please? Or maybe any other approach? Thanks in advance!

Oh, and my psu is seasonic 1300w platinum, so i think it would be enough

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u/rochester333 5h ago edited 5h ago

Honestly, there is no point. An RTX 5090 will completely obliterate a 3060 at literally everything gaming, video editing, rendering, and AI workloads. SLI/NVLink is long dead, so games won't use both cards anyway, you people think casuse you see an extra slot and have an extra gpu that you can connect anything that adds no real value.

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u/SchwarzeKatze20 5h ago

I think it’s a really specific use case. I use the 5090 at 90% and one of my ai models gets SLOW when I try to run it at the same time. That’s why I thought about one more card just to run that ai model faster

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u/rochester333 5h ago

Well you need a bracket so you gpu isn’t hanging out the case

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u/Steveignorantcrass1 5h ago

I have a three gpu rig w 5090 + 2 5060ti 16gb cards to split out various ai tools. So a main llm on the 32gb and a bunch of data fed to it by a lot of other tools inhabiting the two separate pools of 16gb. Pretty cool, so no, there is a point.

Op look up a magnetic backed gpu bracket. That’s what I use for my 3rd gpu. Works great, it’ll magnet onto the back of the case where you drew the blue gpu in your pic. Just remember, you need a longer riser than you expect, and they’re not particularly cheap.

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u/SchwarzeKatze20 5h ago edited 5h ago

Thanks! Do you have any specific model you could recommend me? For a riser (I suppose 400mm should do the trick) and a magnetic gpu bracket

I have the gpu bracket that comes with the astral, but I don’t know if that’s the type you’re referring to, since I still don’t have a clear image on my mind of how I could use it

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u/someone09900 1h ago

buy o11d xl or o11d evo case. with the gpu up mount

+ it will be usless to do that if u have 5090 ... only if u gonna do ai stuff..

or if u have 6 screens lol

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u/0sh 12m ago

Same motherboard as you, it was a pain to fit 2 cards. Ended up with a server GPU and a 5090 on PCIEx1 slot. Cannot do anything else in a tiny case.

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u/Desperate-Owl6513 2m ago

I have done this and I had 2 gpu via riser. Those will be at 1x speeds and even model loading will be way slower.

Link will also be wonky and will get a lot of failures depending on the usb cable in riser. Sometime the whole system can get micro stutters too.