AMD EPYC 4545P vs AMD Ryzen 9 9950X3D Comparison

The AMD Ryzen 9 9950X3D and AMD EPYC 4545P share the same Zen 5 architecture, the same 16 cores and 32 threads, and even the same 4nm TSMC process node. Yet their benchmark results tell two very different stories. The Ryzen 9 wins 12 of the 15 shared head-to-head comparisons, while the EPYC takes three decisive victories. This is a contest where the silicon is nearly identical, but the tuning and intended use cases pull the two processors in opposite directions.

Head-to-Head Benchmarks

The most dramatic split in the data appears in the Cinebench results. In Cinebench R15 multi-core, the Ryzen 9 9950X3D posts a score of 6536 against the EPYC’s 4745, a 37.7% advantage. That is the widest multi-core margin in the entire comparison. But flip to Cinebench R23 multi-core, and the tables turn: the EPYC 4545P scores 47079 versus the Ryzen’s 42018, a 10.8% lead for the server chip. The pattern repeats in single-core tests, where the EPYC dominates. In Cinebench R15 single-core, the EPYC scores 669 against the Ryzen’s 350, a 47.7% gap. In Cinebench R23 single-core, the EPYC’s 6646 crushes the Ryzen’s 2259 by 66%. These are not marginal differences; they indicate fundamentally different performance scaling between the two chips.

Outside of Cinebench, the Ryzen 9 9950X3D sweeps the PassMark suite. The largest win comes in PassMark find prime numbers, where the Ryzen scores 613 versus the EPYC’s 292, a staggering 109.9% delta. PassMark extended instructions shows a 57.9% advantage for the Ryzen (73011 vs 46231), and PassMark physics delivers a 73.9% lead (5670 vs 3260). The Ryzen also wins PassMark data compression by 42.8% (908421 vs 636279), floating point math by 26.3% (159724 vs 126505), and multithread by 31.3% (70255 vs 53504). Even in single-threaded PassMark, where the EPYC’s Cinebench single-core wins might suggest a different outcome, the Ryzen leads 4737 to 4318, a 9.7% margin. The only PassMark category where the EPYC comes close is integer math, where the Ryzen still wins 243209 to 213485, a 13.9% gap. The EPYC’s three wins are all in Cinebench, and they are decisive, but they represent a narrow slice of the overall benchmark picture.

Aggregate scores reinforce the Ryzen’s overall edge. The Ryzen 9 9950X3D has an average benchmark score of 75779, while the EPYC 4545P sits at 75373. Both chips land in the 95th percentile of all CPUs, so neither is a slouch. The Ryzen’s nearest rivals include the AMD Ryzen 7 PRO 9755 (75738, 0.1% behind) and the AMD Ryzen 7 PRO 9755X3D (75716, 0.1% behind), while the EPYC’s closest competitor is the Intel Core Ultra 9 285 (75488, 0.2% ahead). The data shows both processors clustered tightly among top-tier hardware, but the Ryzen consistently pulls ahead in real-world compute workloads.

Architecture Differences

Both CPUs are built on Zen 5 architecture, but they belong to different product families. The Ryzen 9 9950X3D is part of the 9000 series, codenamed Granite Ridge, while the EPYC 4545P comes from the EPYC 4005 series, codenamed Grado. Both use the same 4nm TSMC process node, with 16,630 million transistors spread across two 70.6 mm² dies. The underlying silicon is effectively the same; the differences emerge in how AMD configures it.

The most significant architectural divergence is cache. The Ryzen 9 9950X3D carries 128 MB of L3 cache, while the EPYC 4545P has 64 MB. That 64 MB difference likely explains the Ryzen’s dominance in cache-sensitive workloads like PassMark data compression and extended instructions. Both chips feature 80 KB of L1 cache per core and 1 MB of L2 cache per core, so the L3 allocation is the primary differentiator.

Clock speeds also differ substantially. The Ryzen 9 9950X3D has a base clock of 4.30 GHz and a boost clock of 5.70 GHz, while the EPYC 4545P runs at 3.00 GHz base and 5.40 GHz boost. The Ryzen’s higher boost clock gives it an edge in bursty, single-threaded tasks, which shows up in its PassMark single-thread win. The EPYC’s lower clocks are paired with a much lower TDP: 65 watts versus the Ryzen’s 170 watts. That power envelope is a major architectural statement—the EPYC is designed for sustained, efficient operation, not peak throughput.

Memory support is identical: both support DDR5 with a dual-channel bus and 89.6 GB/s bandwidth, and both support ECC memory. PCIe connectivity matches too, with Gen 5 and 24 lanes from the CPU. Both chips include Radeon Graphics integrated, and both use AMD Socket AM5. The Ryzen has an unlocked multiplier, while the EPYC does not. The Ryzen launched on 2025-01-05 with a launch MSRP of $699, while the EPYC launched on 2025-05-12 with a launch MSRP of $549.

Where Each One Wins

The Ryzen 9 9950X3D is the clear winner for compute-heavy, multi-threaded workloads that benefit from large cache and high clocks. Its 109.9% lead in prime number finding and 57.9% lead in extended instructions point to workloads involving cryptography, scientific computation, and complex mathematical operations. The 73.9% physics win suggests strong performance in simulation and physics-based rendering. Data compression and encryption workloads also favor the Ryzen, with 42.8% and 18.5% leads respectively. For anyone running PassMark-style workloads—which include integer math, floating point math, and random string sorting—the Ryzen wins every category.

The EPYC 4545P wins specifically in Cinebench, which is a rendering workload. Its 66% single-core lead in Cinebench R23 is remarkable, and its 10.8% multi-core win in the same test shows that it scales efficiently when all cores are engaged. The EPYC also wins Cinebench R15 single-core by 47.7%, though it loses multi-core in that older test. This suggests the EPYC is optimized for sustained, all-core rendering tasks where its lower power draw and efficient design shine. The 65-watt TDP makes it far easier to cool and run in dense server environments, even if the benchmark data doesn’t directly measure power efficiency.

The Ryzen’s wins are broader and more consistent. It wins 12 of 15 head-to-head benchmarks, including every PassMark test. The EPYC’s wins are concentrated in Cinebench, which is a popular benchmark but not representative of all compute workloads. For general-purpose processing, the Ryzen’s higher clock speeds and larger cache deliver superior results across the board. The EPYC’s advantage is narrower, but it is real in rendering-specific scenarios.

The Verdict

The data points to a straightforward conclusion: the AMD Ryzen 9 9950X3D is the better all-around processor. It wins the majority of benchmarks, holds a higher average score (75779 vs 75373), and offers double the L3 cache. Its 109.9% lead in prime number finding and 73.9% lead in physics are the kind of margins that translate into real-world performance differences for scientific and simulation tasks. For a desktop user running varied workloads, the Ryzen is the obvious pick.

The AMD EPYC 4545P is not a bad chip—it sits in the same 95th percentile and beats the Ryzen decisively in Cinebench. But its wins are confined to rendering benchmarks. The 66% single-core lead in Cinebench R23 is impressive, and the 10.8% multi-core win shows it can sustain high throughput. Yet with half the L3 cache and lower clock speeds, it cannot match the Ryzen in most other tests. The EPYC is the choice for server or workstation deployments where Cinebench-style rendering is the primary workload and the 65-watt TDP is a critical constraint. For everything else, the Ryzen 9 9950X3D’s data speaks louder.

FAQ

Q: Which CPU has more L3 cache?

A: The AMD Ryzen 9 9950X3D has 128 MB of L3 cache, while the AMD EPYC 4545P has 64 MB.

Q: What are the clock speed differences between the two?

A: The Ryzen 9 9950X3D has a base clock of 4.30 GHz and a boost clock of 5.70 GHz. The EPYC 4545P has a base clock of 3.00 GHz and a boost clock of 5.40 GHz.

Q: How do they compare in Cinebench R23 multi-core?

A: The EPYC 4545P wins with a score of 47079, which is 10.8% higher than the Ryzen 9 9950X3D’s 42018.

Q: Which CPU wins in PassMark data compression?

A: The Ryzen 9 9950X3D scores 908421, which is 42.8% higher than the EPYC 4545P’s 636279.

Q: Are both CPUs built on the same process node?

A: Yes, both use the 4 nm TSMC process node and feature 16,630 million transistors across 2x 70.6 mm² dies.

Q: What is the TDP of each processor?

A: The Ryzen 9 9950X3D has a TDP of 170 watts, while the EPYC 4545P has a TDP of 65 watts.