Which is faster for rendering and simulation?

The 9975WX, on paper: Zen 5 cores, a 100 MHz higher boost and memory validated to 6400 MT/s versus 5200 MT/s. Expect the gap to be modest in heavily multithreaded work, since both have 32 cores and 64 threads.

Does the 7975WX work in the same motherboard?

Yes. Both use socket sTR5 and PCIe 5.0, so the platform is shared. Check the board's BIOS and QVL for the specific chip and your RDIMM kit.

Is the 9975WX worth the extra over the 7975WX?

Only if the price gap is small or your work is memory-bandwidth or clock sensitive. If the 7975WX is near its $1,899.99 low, the savings are hard to ignore for GPU-bound work.

Do either include a cooler?

No. Both are 350 W parts and the 7975WX listing states the thermal solution is not included. Budget for a sTR5 cooler rated well above 350 W.

How much memory can each take?

Both support up to 2 TB of DDR5 RDIMM with ECC. The 9975WX runs it up to 6400 MT/s; the 7975WX up to 5200 MT/s.

They share a 350 W TDP, so cooling demand is similar. The 7975WX lists a 95°C max operating temperature; the 9975WX listing does not state one.

AMD Ryzen Threadripper PRO 9975WX vs AMD Ryzen Threadripper Pro 7975WX

Both are 32-core, 64-thread sTR5 workstation chips with 350 W TDP and PCIe 5.0, so the choice comes down to memory speed and price. The 9975WX is Zen 5 and officially supports DDR5 RDIMM up to 6400 MT/s; the 7975WX is Zen 4 and tops out at 5200 MT/s. The 7975WX has traded between $1,899.99 and $3,592.99 since November 3, 2026, so check its current price against the 9975WX before deciding.

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