AMD EPYC 4585PX vs Intel Xeon 6521P Comparison

The AMD EPYC 4585PX and Intel Xeon 6521P are both 97th-percentile server/workstation processors, but they achieve that ranking through entirely different strategies. The data shows the AMD EPYC 4585PX wins 11 of 17 head-to-head benchmarks, while the Intel Xeon 6521P takes 6, yet the Intel part counters with massive wins in specialized throughput workloads. The AMD chip leads in raw CPU compute, single-thread performance, and multi-threaded rendering, while the Intel chip dominates in floating-point math, data compression, and encryption. This is not a simple "one is better" comparison—it is a split decision based on workload type, with the AMD EPYC 4585PX taking the overall benchmark count but the Intel Xeon 6521P winning the workloads that often matter most in enterprise databases and scientific computing.

Head-to-Head Benchmarks

The AMD EPYC 4585PX's most decisive victory comes in single-threaded performance, where it scores 4538 in PassMark's single-thread test versus the Intel Xeon 6521P's 3238—a 28.6% advantage. This gap is consistent across Cinebench single-core tests: the AMD chip leads by 6.3% in Cinebench R15, R20, and R23 single-core, scoring 860, 3584, and 8534 respectively, against Intel's 806, 3359, and 7998. The AMD chip also wins multi-core Cinebench across the board, again by 6.3% in every version: R15 multicore is 6093 versus 5711, R20 multicore is 25389 versus 23796, and R23 multicore is 60451 versus 56658. In PassMark's multithread test, the AMD EPYC 4585PX scores 68908 against Intel's 66657, a 3.3% lead, and it extends that edge to 9.7% in PassMark physics, scoring 6612 versus 5972. The AMD chip also edges out Intel in integer math, 248563 versus 246263, though only by 0.9%.

The Intel Xeon 6521P's counterattack is led by floating-point math, where it scores 178828 against AMD's 153219—a commanding 16.7% lead. Intel also wins data compression by 9.4% (967721 versus 884774) and random string sorting by 9.8% (104517 versus 95210). Data encryption goes to Intel by 8.5% (51221 versus 47224), and extended instructions by 4.8% (72820 versus 69457). Intel's narrowest win is in find prime numbers, 560 versus 547, a 2.4% margin. Notably, Intel's six wins are concentrated in workloads that stress memory bandwidth and vectorized math, while AMD's eleven wins span general compute, rendering, and single-thread responsiveness. The overall average benchmark scores reflect this split: Intel's average is 105845, while AMD's is 99324, putting Intel 6.6% higher on average despite losing the majority of individual tests. This is because Intel's wins in data compression and floating-point math are large in absolute terms, while AMD's wins in Cinebench are consistent but smaller in percentage.

FAQ

Q: Which processor has a higher single-core score?

A: The AMD EPYC 4585PX wins all single-core benchmarks. It scores 4538 in PassMark single-thread versus Intel's 3238, a 28.6% lead. In Cinebench R23 single-core, AMD scores 8534 against Intel's 7998, a 6.3% advantage.

Q: How do the two compare in multi-threaded rendering?

A: The AMD EPYC 4585PX leads in every Cinebench multi-core test. It scores 60451 in Cinebench R23 multi-core versus Intel's 56658, a 6.3% win. The margin is identical in R15 (6093 versus 5711) and R20 (25389 versus 23796).

Q: Which chip wins in data compression?

A: The Intel Xeon 6521P dominates data compression, scoring 967721 versus AMD's 884774, a 9.4% advantage. Intel also wins random string sorting by 9.8%, suggesting a strong memory subsystem advantage.

Q: What about encryption workloads?

A: Intel leads encryption by 8.5%, scoring 51221 versus AMD's 47224. This is one of Intel's six head-to-head wins, alongside floating-point math, data compression, and extended instructions.

Q: Is there a big difference in floating-point performance?

A: Yes, Intel wins floating-point math by 16.7% (178828 versus 153219). This is Intel's largest margin of victory in any benchmark, while AMD's largest win is single-thread performance at 28.6%.

Q: Which processor has the higher average benchmark score?

A: The Intel Xeon 6521P has a higher average benchmark score of 105845, compared to AMD's 99324. This is despite AMD winning 11 of 17 head-to-head tests, because Intel's wins are in high-magnitude scores like data compression and floating-point math.

Where Each One Wins

The AMD EPYC 4585PX wins in scenarios that demand high clock speeds and responsive single-thread execution. Its PassMark single-thread score of 4538 is 28.6% higher than Intel's, and it carries that advantage into Cinebench R23 single-core (8534 versus 7998). For multi-threaded rendering, AMD's Cinebench R23 multi-core score of 60451 beats Intel's 56658 by 6.3%, making it the better choice for 3D rendering and video encoding that scales across cores. AMD also wins in physics simulations (6612 versus 5972, a 9.7% lead) and integer math (248563 versus 246263), which are common in general-purpose server workloads and database operations. The AMD chip's PassMark multithread score of 68908 also tops Intel's 66657, reinforcing its strength in heavily threaded applications.

The Intel Xeon 6521P wins in workloads that leverage its larger L3 cache and memory bandwidth. Its 144 MB shared L3 cache and eight-channel memory bus (409.6 GB/s) drive a 16.7% win in floating-point math (178828 versus 153219) and a 9.4% win in data compression (967721 versus 884774). Random string sorting, which is sensitive to memory latency and bandwidth, goes to Intel by 9.8% (104517 versus 95210). Encryption is another Intel stronghold, with a 51221 score versus AMD's 47224 (8.5% lead). Extended instructions also favor Intel (72820 versus 69457, a 4.8% margin). For scientific computing, financial modeling, and large-scale data analytics that rely on floating-point throughput and memory bandwidth, the Intel Xeon 6521P is the clear winner despite losing the Cinebench suite.

Specification Differences

The core counts diverge sharply: the Intel Xeon 6521P has 24 cores and 48 threads, while the AMD EPYC 4585PX has 16 cores and 32 threads. Clock speeds favor AMD dramatically—its base clock is 4.30 GHz and boost clock is 5.70 GHz, versus Intel's 2.60 GHz base and 4.10 GHz boost. Thermal design power differs by 55 watts, with Intel at 225W and AMD at 170W. The memory architecture is where Intel's bandwidth advantage originates: Intel uses eight-channel memory with 409.6 GB/s bandwidth, while AMD uses dual-channel memory with 89.6 GB/s. PCIe lane counts also diverge wildly: Intel provides 136 Gen 5 lanes (CPU only), while AMD provides 24 Gen 5 lanes (CPU only). The socket types are incompatible—Intel Socket 4710 versus AMD Socket AM5. The Intel part has no integrated graphics, while the AMD part includes Radeon Graphics. Launch MSRP is $1250 for Intel and $699 for AMD. The Intel die size is 598 mm², while AMD uses two dies of 70.6 mm² each, totaling 141.2 mm².

Architecture Differences

The two processors come from fundamentally different design philosophies. Intel's Granite Rapids architecture is built on a 5 nm process by Intel, while AMD's Zen 5 (Grado) architecture uses a 4 nm process from TSMC. Intel's cache hierarchy is larger in aggregate: 112 KB L1 per core, 2 MB L2 per core, and 144 MB shared L3. AMD's cache is smaller per core—80 KB L1 and 1 MB L2—but its 128 MB L3 is shared across the chip. Intel's higher core count (24 versus 16) and thread count (48 versus 32) are offset by AMD's much higher clock speeds, which explains why AMD wins most compute benchmarks despite having fewer cores. The process node difference (Intel 5 nm versus TSMC 4 nm) contributes to AMD's higher clock ceiling, while Intel's larger die size (598 mm² versus 2x 70.6 mm²) allows for more cores and cache. Intel's memory bandwidth advantage is architectural: eight-channel DDR5 versus AMD's dual-channel DDR5, resulting in a 4.6x bandwidth difference (409.6 GB/s versus 89.6 GB/s). Both support ECC memory and have active production status, but Intel's release date is earlier (2025-02-23) versus AMD's (2025-05-12).

The Verdict

The choice between these two processors depends entirely on the workload profile. For general-purpose compute, rendering, and single-thread-sensitive applications, the AMD EPYC 4585PX is the superior part. Its 28.6% single-thread lead and consistent 6.3% Cinebench wins across all versions make it the obvious pick for workstation tasks, software compilation, and interactive workloads. The AMD chip also wins in physics and integer math, which are common in engineering simulations and general server tasks. Its lower TDP (170W versus 225W) and smaller die size (2x 70.6 mm² versus 598 mm²) suggest it will also be easier to cool and more power-efficient per core, though the data does not include power measurements.

For data-intensive workloads that stress memory bandwidth and floating-point throughput, the Intel Xeon 6521P is the clear winner. Its 16.7% lead in floating-point math, 9.4% in data compression, and 9.8% in random string sorting are decisive. The eight-channel memory bus (409.6 GB/s) gives it a massive bandwidth advantage that directly translates to wins in these benchmarks. The Intel part also wins in encryption and extended instructions, making it the better choice for secure data processing and scientific computing. Its higher average benchmark score (105845 versus 99324) is driven by these large-magnitude wins, despite losing more individual tests. The Intel Xeon 6521P is also the better choice for heavily threaded workloads that can use its 24 cores and 48 threads, provided the workload is not memory-bandwidth limited—but the data shows AMD wins multi-threaded Cinebench, so core count alone does not guarantee victory.

In summary, benchmark results indicate the AMD EPYC 4585PX is the more versatile processor for general compute and rendering, while the Intel Xeon 6521P is specialized for memory-bandwidth and floating-point-heavy tasks. The AMD chip wins 11 of 17 head-to-head tests, but Intel's six wins are in workloads where performance differences are larger in absolute terms. Users prioritizing single-thread speed and Cinebench rendering should choose the AMD EPYC 4585PX. Users prioritizing data compression, encryption, and floating-point math should choose the Intel Xeon 6521P. The data does not support a single "best" processor—it supports two distinct best choices based on workload.