Which is better for rendering and encoding?

The 5965WX usually wins in heavily multithreaded renders thanks to 24 cores and 128 MB L3. The 9955WX closes much of the gap with faster Zen 5 cores, so check benchmarks for your specific app.

Which is better for CAD and single-threaded work?

The 9955WX. Its 5.4 GHz boost and Zen 5 IPC give it a clear lead in modeling, simulation setup and other lightly threaded tasks.

Do they use the same motherboard?

No. The 9955WX needs an sTR5 board; the 5965WX needs a WRX80 board with an sWRX8 socket. Neither fits the other's platform.

Which needs the bigger power supply and cooler?

The 9955WX at 350W TDP draws more and needs a stronger cooler and PSU. The 5965WX at 280W is easier to cool.

Is the 9955WX worth it over the 5965WX?

For a new build, yes: PCIe 5.0, DDR5 and faster cores matter more than the extra 8 cores for most workstation work. For pure multi-threaded throughput on an existing WRX80 system, the 5965WX is the better value.

Which supports more PCIe lanes?

The 9955WX, with up to 148 PCIe 5.0 lanes. The 5965WX sits on the older PCIe 4.0 platform.

AMD Ryzen Threadripper PRO 9955WX vs AMD Ryzen Threadripper PRO 5965WX

Pick the 9955WX for a new workstation build: it has newer Zen 5 cores, PCIe 5.0, DDR5-6400 across 8 channels, and a 148-lane budget on sTR5. Pick the 5965WX only if you already own a WRX80/sWRX8 board and DDR4, where its 24 cores and 128 MB L3 still win on multi-threaded throughput. The 9955WX has fewer cores (16 vs 24) but far faster ones and a much newer platform. No prices were provided for either part, so compare live store prices on this page before deciding.

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