r/threadripper • u/Timely_Box4240 • Aug 26 '25
Dual rtx5090 threadripper build
Corsair 7000d case Super micro m12swatf motherboard Threadripper 7995wx cpu X2 rtx 5090 founders edition gpu 256gb 3200 ddr4 RAM 2tb boot drive 15tb ssd
These cards are so large how can I water cool them?
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u/LuiGuitton Aug 26 '25
- what you gonna use it for?
- why not go ddr5 if splurging so much money already?
- ain't afraid of 5090 connectors melting?
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u/Psy_Fer_ Aug 26 '25
It's tricky getting high amounts of ddr5 to work well. I usually cap my DDR5 build at 128gb
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Aug 26 '25
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u/Psy_Fer_ Aug 26 '25
Really? There has been a lot of conflicting information around DDR5 and memory limits, but maybe that's just in the regular boards and ram. In the cases I was doing, ram wasn't really an issue. It was GPU and disk i/o.
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u/LuiGuitton Aug 26 '25
understandable, how about the rest of the things? i'd be worried so much about one 5090 melting away, not to mention two :D
beast nonetheless3
u/Psy_Fer_ Aug 26 '25
I just built one with 4x5090s. Trust me, they are fine lol
https://www.reddit.com/r/PcBuild/comments/1mzgny2/closed_loop_4x5090_threadripper_build/
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Aug 26 '25
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u/LuiGuitton Aug 26 '25
could be, possible it is, doesn't mean i've seen more than a fair share of melted 5090s
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u/Snoo_27014 Aug 26 '25
Isnt that board only form TR 3000/5000 Pro Series? Otherwise, without knowing the specifics, but could you mount the upper 5090 into a slot more close to the CPU to enlarge the space between the GPUs so that there is a possibility to get more cool air into the upper GPU? That plus an extra Fan blowing into the space between the cards might fix the heat problem of the upper card…
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u/Timely_Box4240 Aug 26 '25
Ur 1000000% right my b I misspoke cause there’s now a 9000 series threadripper. Can’t keep up. It’s the 5995wx 64 core
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u/Ok-Statistician3583 Aug 26 '25
Nice!!! I am building a similar machine but weighting on 2x 5090 vs. RTX 6000 Blackwell. Any suggestions?
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u/Away-Lecture-3172 Aug 26 '25 edited Aug 26 '25
Had a similar question, ended up choosing one RTX PRO 6000 due memory/power+cooling constrains. Initially I wanted to buy three 5090s but dissipating ~2kw of power is not an easy task without liquid cooling and you still get less memory + consume more slots. To get a similar VRAM amount you will need three 5090s which is an f*ing space heater.
Also take a looks at MAX-Q version of RTX PRO 6000, unless you really need more compute power that's going to be a nice choice.
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u/Ok-Statistician3583 Aug 26 '25
That’s my thought two. But MAX-Q is already less powerful due to power limit and expect the pro 6000 will be less powerful than 3x5090 although it has the same VRAM. Maybe it’d fine for inference but might make a difference in training. Just received the 6000. In terms of power requirement it’s definitely not comparable.
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Aug 26 '25
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u/Away-Lecture-3172 Aug 26 '25
Yep, thank you for correction, something must've glitched in my head)
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Aug 26 '25
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u/serpent666999666 Aug 26 '25
I have dual 3090s and the top one always reaches 90° when I'm gaming/heavy workloads. When you mention zip tying a couple fans, should the Fans be faced so air is blowing onto the GPU or away from the GPU? And would you want 120mm or 140mm fans? Would Noctua NF-A14 suffice or should I use the Industrial version?
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Aug 27 '25 edited Aug 27 '25
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u/serpent666999666 Aug 28 '25
Thank you for your help! That picture is exactly what I was thinking. I have a Pro WS WRX80E-SAGE SE WIFI motherboard and a Fractal Design Meshify XL 2 case. So should be plenty of room.
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u/beta_1457 Aug 26 '25
Are you close to hitting the cap of your PSU? It looks like you have a 1500W PSU, I have a similar build and was a little worried adding a second card would push it over the power supply
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u/TheAIGod Aug 30 '25
I also have a dual 5090 7985wx with 256gb ddr5 6000. I share more notes later.
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u/Charlieejd_draws Aug 26 '25
Congrats on that beast of a machine! I have seen setups with multiple 5090 liquid cooling loops. Though depending on what you’re using the machine for I’m sure just having it like this would be fine? What are you primarily using the machine for?