Is the 5975WX worth the extra over the 3975WX?

Yes if the price gap is small. You get Zen 3 IPC gains plus 300 MHz more boost on the same 32-core, 128 MB cache platform. If the 3975WX is much cheaper and your workload is purely multi-threaded, the gap narrows.

Do they use the same motherboard?

Yes. Both are Socket sWRX8 parts with 8-channel DDR4-3200 and registered ECC support, so a WRX80 board works with either. A BIOS update may be needed for the 5975WX on older boards.

Which is better for rendering and simulation?

Both have 32 cores and 64 threads, so multi-threaded rendering is close. The 5975WX still wins on average thanks to Zen 3's higher per-core performance and 4.5 GHz boost.

Neither is cool at 280 W TDP. The 3975WX has a lower 90 °C max temperature, but both need a serious sWRX8 cooler; the 5975WX allows up to 95 °C.

Do either have integrated graphics?

No. Both need a discrete graphics card, which matters for workstation builds used for CAD or content creation.

AMD Ryzen Threadripper PRO 5975WX vs AMD Ryzen Threadripper PRO 3975WX

Both are 32-core, 64-thread sWRX8 workstation chips with 128 MB L3 cache and 280 W TDP. The 5975WX is the newer Zen 3 part and is faster per core: 3.6 GHz base and 4.5 GHz boost versus 3.5 GHz and 4.2 GHz on the Zen 2 3975WX. Buy the 5975WX unless the 3975WX is clearly cheaper, since the platform, memory support and core count are identical.

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