Which is better for 3D rendering and video export?

The 7960X. It has 24 Zen 4 cores against 16 Zen 2 cores, plus a 5.3 GHz boost and 152 MB cache, so it wins on multi-threaded renders by a wide margin.

Is the 3955WX worth it if it is much cheaper?

Only for an existing sWRX8 system or a memory-bandwidth-bound job. For a new build, the 7960X's platform cost buys far more CPU performance.

Which uses less power?

The 3955WX at 280 W TDP versus 350 W for the 7960X. Under full load the 7960X will draw more, so plan cooling and PSU headroom accordingly.

Do either have integrated graphics?

No. Both need a discrete graphics card.

Which supports more memory?

The 7960X, with DDR5 up to 1 TB across four channels. The 3955WX uses DDR4 and is listed at 32 GB maximum here.

Can I move a 3955WX into a 7960X board?

No. The 3955WX uses sWRX8 and the 7960X uses sTR5, so they need different motherboards.

AMD Ryzen Threadripper 7960X vs AMD Ryzen Threadripper PRO 3955WX

Buy the Threadripper 7960X if you want the fastest current platform: 24 Zen 4 cores, DDR5, PCIe 5.0 and a 1 TB memory ceiling. The PRO 3955WX is a 2020 Zen 2 part with 16 cores and DDR4, and only makes sense at a steep discount for an existing sWRX8 workstation. No prices were given for either chip, so compare live store prices on this page before deciding.

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