AMD Ryzen Threadripper PRO 3975WX vs AMD Ryzen Threadripper PRO 7965WX
Buy the 7965WX for a new workstation: it is faster per core, uses DDR5, and runs on the current sTR5 platform. Buy the 3975WX only if you already own an sWRX8 board and need 32 cores and 128 MB of L3 cache on a budget. The 3975WX is the older 2020 part on DDR4; the 7965WX is the 2023 part with 24 cores but much higher clocks.
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AMD Ryzen Threadripper PRO 3975WX
AMD Ryzen Threadripper PRO 3975WX Processor
Choose the Ryzen Threadripper PRO 3975WX if you need 32 cores and 128 MB of L3 cache and already have an sWRX8 motherboard and DDR4 registered memory.
- 32 cores and 64 threads for heavily multithreaded rendering and simulation
- 128 MB L3 cache helps large working sets
- 280 W TDP is easier to cool than the 350 W part
- Runs on cheaper DDR4 registered ECC memory
What separates them
| AMD Ryzen Threadripper PRO 3975WX | AMD Ryzen Threadripper PRO 7965WX | |
|---|---|---|
| Cores and threads | 32 cores, 64 threads | 24 cores, 48 threads |
| Base and boost clock | 3.5 GHz base, 4.2 GHz boost | 4.2 GHz base, 5.3 GHz boost |
| L3 cache | 128 MB | Not listed in the specs given |
| Socket and platform | Socket sWRX8, WRX80 chipset boards | Socket sTR5, TRX50 and WRX90 boards |
| Memory | 8-channel DDR4-3200, registered ECC | 8-channel DDR5 up to 5200 MT/s, ECC, 1 TB max |
| PCI Express | PCIe 4.0 | PCIe 5.0 on sTR5 |
| Power draw | 280 W TDP | 350 W TDP |
Price history
- AMD Ryzen Threadripper PRO 3975WX: lowest $547.95 on Nov 3 at Amazon.
- AMD Ryzen Threadripper PRO 7965WX: lowest $2,585.71 on Nov 3 at Amazon.
Prices at every store
AMD Ryzen Threadripper PRO 3975WX
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AMD Ryzen Threadripper PRO 7965WX
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Specs compared
| Spec | AMD Ryzen Threadripper PRO 3975WX | AMD Ryzen Threadripper PRO 7965WX |
|---|---|---|
| Clock Speed | 3.5 GHz | 4.2 GHz |
| Number of Cores | 32-core | 24 |
| Number of Threads | 64 threads | 48 |
| Socket Type | Socket sWRX8 | Socket sTR5 |
| Integrated Graphics | No | No |
| Manufacturer | AMD | AMD |
| Boost Clock Speed | 4.2 GHz | 5.3 GHz |
| Thermal Design Power (TDP) | 280 W | 350 W |
| Supports Overclocking | Yes | Yes |
| RAM Type | DDR4 | DDR5 |
What reviewers say
AMD Ryzen Threadripper PRO 3975WX
Owners of the 3975WX generally describe it as a rendering and simulation workhorse, with the memory bandwidth and PCIe lane count doing as much work as the core count. Complaints center on heat, power draw and the price of the WRX80 platform rather than on the chip's throughput.
- Multi-core performancePraisedOwners report large gains in rendering, encoding and simulation versus consumer chips.
- Memory bandwidthPraisedThe 8-channel DDR4 with ECC is cited as a real advantage for large datasets.
- Heat and powerCriticisedThe 280W TDP means big coolers and strong power supplies are mandatory.
Questions and answers
- Which is better for 3D rendering?
- The 3975WX has 32 cores against 24, so it wins in renders that scale across all threads. The 7965WX closes much of the gap with Zen 4's higher per-core throughput, so check benchmarks for your specific renderer.
- Which is better for CAD and single-threaded work?
- The 7965WX. Its 5.3 GHz boost is well above the 3975WX's 4.2 GHz, and Zen 4 does more work per clock.
- Do they use the same motherboard?
- No. The 3975WX needs an sWRX8 board, and the 7965WX needs an sTR5 board. They are not interchangeable.
- Can I reuse my DDR4 memory with the 7965WX?
- No. The 7965WX uses DDR5; the 3975WX uses DDR4. Moving to the newer chip means new memory.
- Is the 7965WX worth it over the 3975WX?
- For a new build, yes. You get faster cores, DDR5, PCIe 5.0 and a current platform. If you already own an sWRX8 system, the 3975WX is the cheaper drop-in upgrade.
- Which runs cooler?
- The 3975WX at 280 W TDP is easier to cool than the 7965WX at 350 W. Both need a large Threadripper-class cooler.