AMD Athlon PRO 3045B vs Intel Xeon X5550 Comparison

Where Each One Wins

The benchmark data splits cleanly along workload type, with the Intel Xeon X5550 taking every recorded Cinebench victory. Across five head-to-head tests, the Xeon wins all of them, posting margins between 9.3% and 9.6% depending on the test. The AMD Athlon PRO 3045B does not win a single recorded benchmark, yet its overall standing in the database is nearly identical to the Xeon’s, which suggests the Athlon’s strengths lie outside the Cinebench suite or in efficiency rather than raw rendering throughput.

For multi-threaded workloads, the Xeon X5550 is the clear choice. Its four cores and eight threads give it a structural advantage in Cinebench R15, R20, and R23 multi-core tests, where it leads by 9.3% to 9.6%. The R23 multi-core result of 2580 against the Athlon’s 2354 represents a 9.6% gap, the largest margin recorded in the head-to-head set. Single-core results tell a similar story: the Xeon leads in Cinebench R20 single-core by 9.4% (152 vs. 139) and in R23 single-core by 9.6% (364 vs. 332). This means the Xeon is not just winning on thread count; it is also faster per thread in these specific tests.

The Athlon PRO 3045B, however, is not without its own case. It is a 15 W part versus the Xeon’s 95 W, and it is built on a much newer 14 nm process from GlobalFoundries. The database shows the Athlon holding a 23rd percentile ranking across all CPUs, nearly tied with the Xeon’s 24th percentile. In Geekbench, which the Xeon lacks recorded data for, the Athlon scores 1287 multi-core and 766 single-core. Those numbers place it in the same competitive band as the Xeon’s Cinebench rivals, meaning the Athlon’s overall average benchmark score of 872 is only 1.8% behind the Xeon’s 888. For users prioritizing power efficiency, integrated graphics, or a modern platform, the Athlon wins in ways the Cinebench suite does not capture.

The practical split: the Xeon X5550 is for legacy server or workstation builds where multi-threaded rendering matters and power draw is not a constraint. The Athlon PRO 3045B is for compact, low-power, or mobile systems where the 15 W envelope and Radeon Vega graphics (2 compute units) make it a more versatile package, despite losing every recorded head-to-head benchmark.

Architecture Differences

The two processors come from different eras and design philosophies. The Intel Xeon X5550 uses the Nehalem architecture, specifically the Gainestown codename, built on Intel’s 45 nm process. It packs 731 million transistors into a 263 mm² die. The AMD Athlon PRO 3045B uses the Zen architecture under the Dali codename, fabricated by GlobalFoundries on a 14 nm process, with 3,500 million transistors on a 148 mm² die. The transistor count difference is stark: AMD crams nearly five times as many transistors into a much smaller die, a direct result of the newer process node.

Core counts diverge significantly. The Xeon offers 4 cores and 8 threads, while the Athlon offers 2 cores and 4 threads. Cache layouts also differ. The Xeon has 64 KB of L1 per core, 256 KB of L2 per core, and 8 MB of shared L3. The Athlon has 96 KB of L1 per core, 512 KB of L2 per core, and 4 MB of shared L3. The Athlon gives each core more private cache, but the Xeon doubles the shared L3 pool.

Memory support reflects their respective generations. The Xeon uses DDR3 with a triple-channel memory bus, while the Athlon uses DDR4 with a dual-channel bus and a recorded bandwidth of 38.4 GB/s. The Xeon has no recorded memory bandwidth figure. Both support ECC memory, which makes sense given their server and workstation heritage. The Xeon is Socket 1366, the Athlon is Socket FP5.

PCIe generations differ too. The Xeon supports PCIe Gen 2, while the Athlon supports PCIe Gen 3 with 12 lanes from the CPU. The Athlon also integrates Radeon Vega graphics with 2 compute units, a feature the Xeon lacks entirely. The Xeon is marked end-of-life and released in March 2009, while the Athlon is listed as active production with no release date recorded. The Xeon has a part number of SLBF5; the Athlon is YM3045C4T2OFG. Neither chip has an unlocked multiplier.

Head-to-Head Benchmarks

The recorded head-to-head data covers five Cinebench tests, and the Intel Xeon X5550 wins all of them. The narrowest margin is in Cinebench R15 multi-core, where the Xeon scores 259 against the Athlon’s 237, a 9.3% advantage. The widest margins, 9.6%, appear in three tests: Cinebench R20 multi-core (1083 vs. 988), Cinebench R23 multi-core (2580 vs. 2354), and Cinebench R23 single-core (364 vs. 332). Cinebench R20 single-core sits between those, with the Xeon at 152 versus the Athlon’s 139, a 9.4% edge.

The consistency of these margins is notable. Across all five tests, the Xeon’s advantage never drops below 9.3% and never exceeds 9.6%. This uniformity suggests the performance gap is not workload-specific within Cinebench; it is a general per-core and multi-core deficit for the Athlon in this rendering engine. The Xeon’s higher base clock of 2.67 GHz versus 2.30 GHz, and its boost clock of 3.07 GHz versus 3.20 GHz, tells part of the story. The Xeon has a lower peak boost but a higher base, and it still wins even in single-core tests where the Athlon’s boost clock is higher by 0.13 GHz.

The Athlon’s only recorded non-Cinebench results come from Geekbench, where it scores 1287 multi-core and 766 single-core. There is no equivalent Geekbench data for the Xeon, so cross-comparison is limited. The database’s nearest rivals for the Xeon include the Intel Core i3-6100 at an identical average score of 888 (0% delta), the Intel Pentium G4560T at 887 (0.1% ahead of the Xeon), and the AMD PRO A8-8650B at 887 (0.2% ahead). For the Athlon, the nearest rivals are the Intel Atom C5315 at 871 (0.1% ahead of the Athlon), the Intel Core i3-5157U at 877 (0.5% behind the Athlon), and the Intel Core i7-3540M at 867 (0.6% behind). Both chips sit in a dense cluster of similarly performing processors.

Specification Differences

The two processors differ in nearly every major specification category. The Xeon has 4 cores and 8 threads; the Athlon has 2 cores and 4 threads. Base clocks are 2.67 GHz for the Xeon and 2.30 GHz for the Athlon, while boost clocks are 3.07 GHz and 3.20 GHz respectively. Thermal design power is a major differentiator: the Xeon is rated at 95 W, the Athlon at just 15 W.

Process technology separates them by two generations. The Xeon is on Intel’s 45 nm node; the Athlon is on GlobalFoundries’ 14 nm node. Transistor counts are 731 million for the Xeon and 3,500 million for the Athlon. Die size is 263 mm² for the Xeon and 148 mm² for the Athlon.

Cache hierarchies differ in both size and organization. The Xeon has 64 KB L1 per core, 256 KB L2 per core, and 8 MB shared L3. The Athlon has 96 KB L1 per core, 512 KB L2 per core, and 4 MB shared L3. Memory support is DDR3 for the Xeon with triple-channel access, and DDR4 for the Athlon with dual-channel access. The Athlon has a recorded memory bandwidth of 38.4 GB/s; the Xeon has none recorded. Both support ECC memory.

Platform features also split them. The Xeon uses Socket 1366 and PCIe Gen 2 lanes. The Athlon uses Socket FP5 and PCIe Gen 3 with 12 CPU lanes. The Athlon integrates Radeon Vega graphics with 2 compute units; the Xeon has no integrated graphics. The Xeon is end-of-life with a March 2009 release date and part number SLBF5. The Athlon is active production status with no release date recorded and part number YM3045C4T2OFG. Both are multiplier-locked, and neither has a launch MSRP in the database.

FAQ

Q: Which processor has more cores and threads?

A: The Intel Xeon X5550 has 4 cores and 8 threads. The AMD Athlon PRO 3045B has 2 cores and 4 threads.

Q: What is the TDP difference between the two chips?

A: The Xeon X5550 is rated at 95 W, while the Athlon PRO 3045B is rated at 15 W. The Athlon uses 15 W total, making it 80 W lower than the Xeon.

Q: How much L3 cache does each processor have?

A: The Xeon X5550 has 8 MB of shared L3 cache, split as 64 KB L1 and 256 KB L2 per core. The Athlon PRO 3045B has 4 MB of shared L3 cache, split as 96 KB L1 and 512 KB L2 per core.

Q: Does either processor support ECC memory and integrated graphics?

A: Both the Xeon X5550 and the Athlon PRO 3045B support ECC memory. Only the Athlon PRO 3045B includes integrated Radeon Vega graphics with 2 compute units; the Xeon has no integrated graphics.

Q: Which processor wins the recorded Cinebench R23 multi-core test, and by how much?

A: The Intel Xeon X5550 wins Cinebench R23 multi-core with a score of 2580 versus the Athlon PRO 3045B’s 2354, a 9.6% difference.

Q: How does the base clock of the Xeon compare to the Athlon’s boost clock?

A: The Xeon X5550 has a base clock of 2.67 GHz and a boost clock of 3.07 GHz. The Athlon PRO 3045B has a base clock of 2.30 GHz and a boost clock of 3.20 GHz.