AMD Ryzen Threadripper PRO 3975WX vs Intel Xeon 6756E Comparison

Intel Xeon 6756E and AMD Ryzen Threadripper PRO 3975WX target different corners of the high-core-count market, and the benchmark data in our database reflects that split clearly. The Intel part is a 128-core server monster built for dense scale-out workloads, while the AMD chip is a 32-core workstation-class processor that leans on higher clocks and mature software ecosystems. Across every shared test in our database, the Threadripper PRO 3975WX wins decisively, but the story is more nuanced when you consider what each processor is designed to do.

Head-to-Head Benchmarks

The six direct comparisons in our database all go the same way: AMD Ryzen Threadripper PRO 3975WX wins every single test, and it wins by a massive, uniform margin. In Cinebench R15 multi-core, the Threadripper scores 5331 against the Xeon’s 980, a difference of 81.6 percent in AMD’s favor. The single-core R15 test tells the same tale: 752 versus 138, again an 81.6 percent gap. That consistent delta across both single- and multi-threaded workloads is striking because it suggests the performance difference is not about core count scaling but about fundamental per-thread throughput.

Moving to Cinebench R20, the pattern holds. The Threadripper PRO 3975WX posts 22215 in multi-core, while the Xeon 6756E manages only 4085. Single-core R20 shows 3136 against 576. The delta remains exactly 81.6 percent, indicating that the relative advantage is identical regardless of workload type. Cinebench R23 repeats the same story: multi-core 52895 for AMD versus 9728 for Intel, single-core 7467 versus 1373. Every single comparison in the database carries the same 81.6 percent deficit for the Xeon. That uniformity is unusual; most rivalries show different margins for different tests, but here the gap is locked in.

What does that mean in practical terms? The Threadripper PRO 3975WX is not just faster; it is faster by the same proportion whether you are rendering a frame or running a single-threaded script. This points to a per-core performance advantage that is roughly constant, which is consistent with the architectural differences (detailed later). The Xeon 6756E’s 128 cores do not help it in these tests because the software is not able to leverage that many threads effectively, or because each of its cores is significantly slower. The recorded data shows no test where the Xeon wins, and the win count is 0 versus 6.

Given that the Xeon has four times the cores of the Threadripper (128 versus 32), you might expect multi-core tests to be closer. Instead, the AMD chip’s 81.6 percent lead in multi-core Cinebench tests suggests that its higher base and boost clocks (3.50 GHz and 4.20 GHz versus 1.80 GHz and 2.60 GHz) plus more capable per-core architecture overwhelm the raw core count. The Xeon’s 128 threads are simply not translating into render performance here.

Where Each One Wins

Based on the benchmark data, the AMD Ryzen Threadripper PRO 3975WX wins everywhere that both chips were tested. That includes all six Cinebench variants, which cover both single-core and multi-core workloads. For any user running rendering, simulation, or single-threaded applications that rely on high clock speeds, the Threadripper is the clear choice from this dataset.

The Intel Xeon 6756E does have a domain where it can claim superiority, but it is not in the benchmark suite we have: the database shows no wins for the Xeon in any recorded test. However, the Xeon’s specifications point to strengths that the benchmarks do not capture. It has 128 cores and 128 threads, which is four times the core count of the Threadripper. In highly parallel, throughput-oriented workloads that can scale to dozens or hundreds of threads, the Xeon’s core density could be an advantage, even if our current benchmark set does not show it. The Xeon also supports DDR5 memory with a bandwidth of 409.6 GB/s, exactly double the Threadripper’s 204.8 GB/s. Memory-bandwidth-bound tasks, such as large database scans or in-memory analytics, could favor the Xeon despite its per-core deficit.

The Threadripper PRO 3975WX, by contrast, wins on any workload that is sensitive to single-thread speed or modest thread counts. Its 3.50 GHz base and 4.20 GHz boost clocks are nearly double the Xeon’s, and its Zen 2 architecture delivers far better instructions per clock in most applications. For desktop workstation use, video editing, 3D modeling, and software compilation, the data clearly favors AMD.

The practical takeaway is that this is not a fair fight in the traditional sense. The Xeon 6756E is a server part aimed at scale-out deployments, not desktop rendering. The Threadripper is a desktop processor for professionals who need high clocks and strong multi-core performance on a single socket. If you are comparing them on the same benchmarks, the Threadripper wins outright. If you are choosing a CPU for a rack server running many virtual machines, the Xeon’s core count and memory bandwidth may matter more, but that is not visible in our current data.

Architecture Differences

The two processors come from different design philosophies. The Intel Xeon 6756E uses Sierra Forest architecture on a 5 nm process node fabricated by Intel itself. It is part of the Xeon 6 generation (Sierra Forest-SP) and is built for efficiency and density rather than raw per-core speed. The die size is 578 mm², and it packs 128 cores with 128 threads, meaning no hyperthreading. Each core has 96 KB of L1 cache, and each module has 4 MB of L2. The shared L3 cache is 96 MB. The chip runs on Intel Socket 4710 and uses DDR5 memory across an eight-channel bus, achieving 409.6 GB/s of bandwidth. It has 88 PCIe Gen 5 lanes from the CPU.

The AMD Ryzen Threadripper PRO 3975WX is a Zen 2 part, codenamed Castle Peak, built on a 7 nm process at TSMC. It has 32 cores and 64 threads, so it does use simultaneous multithreading. The die is composed of four chiplets, each 74 mm², totaling about 296 mm² of active silicon, with 15,200 million transistors across the package. L1 cache is 64 KB per core, L2 is 512 KB per core, and L3 is a large 128 MB. It uses DDR4 memory on an eight-channel bus, providing 204.8 GB/s of bandwidth, and offers 128 PCIe Gen 4 lanes. The socket is AMD Socket WRX8.

The most obvious difference is node and foundry: Intel’s 5 nm versus TSMC’s 7 nm. The Xeon’s smaller node allows it to fit 128 cores onto a single 578 mm² die, while the Threadripper spreads 32 cores across four chiplets. The Xeon has more L2 cache per module (4 MB versus 512 KB per core), but the Threadripper has more L3 (128 MB versus 96 MB). The Xeon’s memory bandwidth is double, but the Threadripper’s per-core cache allocation is larger because it has fewer cores sharing the L3.

Clock speeds are a major differentiator. The Xeon runs at 1.80 GHz base and 2.60 GHz boost, which is low even for a server chip. The Threadripper runs at 3.50 GHz base and 4.20 GHz boost, nearly double. That explains the 81.6 percent benchmark gap. The Xeon’s TDP is 225 watts, while the Threadripper’s is 280 watts, meaning the AMD chip uses more power but delivers far more performance in these tests. The Xeon’s lower power draw per core is a design choice for dense server deployments where cooling and power budgets are tight.

Memory support also differs. The Xeon uses DDR5, which is newer and higher-bandwidth, but the Threadripper is limited to DDR4. In practice, the Xeon’s 409.6 GB/s versus the Threadripper’s 204.8 GB/s means the Intel chip can feed its many cores more data, but that does not overcome the per-core clock disadvantage in the recorded benchmarks. The PCIe generations differ as well: Gen 5 on the Xeon with 88 lanes versus Gen 4 on the Threadripper with 128 lanes. The Threadripper offers more total lanes, which matters for workstation users with multiple GPUs and NVMe drives.

The Xeon has no integrated graphics, and the Threadripper also has none listed, so both require a discrete GPU. The Xeon is marked as a Server/Workstation segment, while the Threadripper is Desktop. The Xeon’s release date is June 2024, while the Threadripper launched in July 2020. That four-year gap explains the architectural differences: the Xeon is a modern efficiency-focused design, while the Threadripper is an older but higher-clocked part.

FAQ

Q: Which CPU has more cores and threads?

A: The Intel Xeon 6756E has 128 cores and 128 threads. The AMD Ryzen Threadripper PRO 3975WX has 32 cores and 64 threads.

Q: Which processor wins in the Cinebench R23 multi-core test?

A: The AMD Ryzen Threadripper PRO 3975WX scores 52895, while the Intel Xeon 6756E scores 9728. AMD wins by 81.6 percent.

Q: What is the memory bandwidth difference?

A: The Intel Xeon 6756E supports DDR5 with 409.6 GB/s of bandwidth. The AMD Ryzen Threadripper PRO 3975WX supports DDR4 with 204.8 GB/s. Intel has double the bandwidth.

Q: Do both CPUs support ECC memory?

A: Yes, both the Intel Xeon 6756E and the AMD Ryzen Threadripper PRO 3975WX have ECC memory support.

Q: Which chip has a higher boost clock?

A: The AMD Ryzen Threadripper PRO 3975WX has a boost clock of 4.20 GHz. The Intel Xeon 6756E has a boost clock of 2.60 GHz.

Q: How many PCIe lanes does each CPU provide from the CPU itself?

A: The Intel Xeon 6756E provides 88 PCIe Gen 5 lanes. The AMD Ryzen Threadripper PRO 3975WX provides 128 PCIe Gen 4 lanes.

Specification Differences

The two processors differ across nearly every major specification. Core count is the biggest gap: 128 cores and 128 threads on the Xeon versus 32 cores and 64 threads on the Threadripper. Clock speeds are opposite: the Xeon runs at 1.80 GHz base and 2.60 GHz boost, while the Threadripper runs at 3.50 GHz base and 4.20 GHz boost. TDP also differs, with the Xeon rated at 225 watts and the Threadripper at 280 watts.

The process nodes are different: Intel’s 5 nm for the Xeon versus TSMC’s 7 nm for the Threadripper. The foundry is Intel for the Xeon and TSMC for the AMD part. Die size is 578 mm² for the Xeon, while the Threadripper uses four chiplets of 74 mm² each. The Threadripper lists 15,200 million transistors, while the Xeon does not have a transistor count in our data.

Cache configurations are distinct. The Xeon has 96 KB of L1 per core, 4 MB of L2 per module, and 96 MB of shared L3. The Threadripper has 64 KB of L1 per core, 512 KB of L2 per core, and 128 MB of L3. Memory support differs: DDR5 for the Xeon, DDR4 for the Threadripper. Memory bandwidth is 409.6 GB/s for Intel and 204.8 GB/s for AMD. Both use an eight-channel memory bus.

PCIe support varies: the Xeon has Gen 5 with 88 lanes, while the Threadripper has Gen 4 with 128 lanes. The sockets are different: Intel Socket 4710 versus AMD Socket WRX8. The market segment is Server/Workstation for the Xeon and Desktop for the Threadripper. Release dates are June 2024 for the Xeon and July 2020 for the Threadripper.

The launch MSRP is $8428 for the Intel Xeon 6756E and $2749 for the AMD Ryzen Threadripper PRO 3975WX. Both are listed as Active in production status. Neither has an unlocked multiplier. The Xeon’s part number is SRPFX, while the Threadripper’s is 100-000000086100-100000086WOF. The Xeon’s architecture is Sierra Forest, and the Threadripper’s is Zen 2 (Castle Peak).

The benchmark averages in the database are 14163 for the Xeon and 13786 for the Threadripper, both sitting at the 68th percentile among all CPUs. The Xeon’s nearest rivals by average score include the Intel Core i5-10400F, AMD EPYC 7552, Intel Core 7 160UL, and AMD Ryzen 3 7320C. The Threadripper’s nearest rivals include the Intel Core 3 304, Intel Core i7-8750H, AMD EPYC 7443, and Intel Core 5 120UL. The Xeon’s average score is 0.2 percent below the Core i5-10400F and 0.3 percent above the EPYC 7552. The Threadripper’s average score is 0.3 percent above the Core 3 304 and 1.4 percent above the Core 5 120UL.

In summary, the data shows a clear performance hierarchy for the tested workloads, but the specification sheets reveal two very different design targets. The Xeon 6756E is a high-density server chip with modest clocks and massive core count, while the Threadripper PRO 3975WX is a high-clock workstation processor with fewer cores but far better per-thread performance. The benchmark results favor AMD overwhelmingly, but the Intel part’s strengths in memory bandwidth and core density are not captured in the current test suite.