CPU Comparison

# The Verdict

The data presents a striking outcome: the Intel Xeon E5530, a server processor from 2009, wins all five head-to-head benchmark comparisons against the AMD A6-9400, a desktop part released a decade later. The margins are narrow, ranging from 0.6% to 0.9%, but they are consistent across every Cinebench test. Neither chip can claim meaningful dominance; the average benchmark scores are 801 for the Xeon and 794 for the A6, a difference of less than 1%.

The percentiles tell the same story: both processors sit at the 21st percentile among all CPUs, placing them in the lower tier of performance. The nearest rivals for the Xeon include the AMD A10-7700K and Intel Pentium Silver J5040, both with identical average scores of 801. The A6-9400's closest competition includes the AMD A10-5800B at 794 and the Intel Core 2 Extreme QX9770 at 790. These are budget-era parts, and neither chip escapes that classification.

Who should pick which? The Xeon E5530 offers eight threads, ECC memory support, and triple-channel DDR3, features that suit legacy server or workstation builds where stability and memory integrity matter. The A6-9400 counters with DDR4 support, a dual-channel memory bus with higher bandwidth (38.4 GB/s vs 25.6 GB/s), and an integrated Radeon R5 GPU, making it more suitable for a basic desktop that needs graphics without a discrete card. The data does not favor either for raw compute; it favors the Xeon by a hair in every test, but the A6's platform advantages (newer socket, active production status, integrated graphics) may outweigh a 0.6% benchmark gap for many users.

# Architecture Differences

The two processors come from fundamentally different eras and design philosophies. The Intel Xeon E5530 uses the Nehalem architecture, specifically the Gainestown codename, built on a 45 nm process at Intel's foundry. It packs 731 million transistors into a 263 mm² die. The core configuration is 4 cores with 8 threads via Hyper-Threading, running at a base clock of 2.40 GHz and a boost of 2.67 GHz. The cache hierarchy is per-core: 64 KB L1 and 256 KB L2 per core, plus 8 MB of shared L3. It supports DDR3 memory over a triple-channel bus, yielding 25.6 GB/s of bandwidth. ECC memory is supported, and the PCIe interface is Gen 2. The socket is Intel Socket 1366, and the part is end-of-life.

The AMD A6-9400 uses the Excavator architecture, codenamed Bristol Ridge, built on a 28 nm process at GlobalFoundries. Despite having only 2 cores and 2 threads, it packs 3,100 million transistors into a 250 mm² die, more than four times the transistor count of the Xeon on a larger node. The base clock is 3.40 GHz, boosting to 3.70 GHz, which is substantially higher than the Xeon's clocks. Cache is organized differently: 160 KB of L1 and 1 MB of shared L2, with no L3 at all. It supports DDR4 over a dual-channel bus, achieving 38.4 GB/s bandwidth, 50% higher than the Xeon. ECC is not supported, and PCIe is Gen 3 with 8 lanes from the CPU. The socket is AMD Socket AM4, and the part is still in active production. It also includes integrated Radeon R5 graphics, a feature entirely absent from the Xeon.

The transistor count difference is striking: 3,100 million vs 731 million. Yet the benchmark scores are nearly identical. This suggests that the Xeon's older, larger-core design and higher thread count compensate for the A6's higher clocks and newer memory interface. The absence of L3 cache on the A6 may also explain why its higher clock speed does not translate into a decisive win.

# Where Each One Wins

Based strictly on the benchmark data, the Intel Xeon E5530 wins everywhere, but the margins are so small that the practical significance is limited. In Cinebench R15 multicore, the Xeon scores 234 vs 232 for the A6, a 0.9% edge. In R20 multicore, it's 977 vs 969 (0.8%). In R23 multicore, 2328 vs 2309 (0.8%). The single-core tests are even tighter: R20 single-core shows 137 vs 136 (0.7%), and R23 single-core shows 328 vs 326 (0.6%).

The pattern suggests that the Xeon's 8 threads give it a slight edge in multi-threaded workloads, while the A6's higher clock speed (3.40 GHz base vs 2.40 GHz) should favor single-threaded performance, yet the Xeon still wins those tests. This implies that the Excavator architecture's efficiency per clock is not sufficient to overcome the Xeon's architectural advantages, or that the Cinebench workload is not sensitive to the A6's strengths.

For use cases, the Xeon's ECC memory support and server-grade pedigree make it a candidate for legacy workstation builds where data integrity is paramount, even if performance is modest. The A6's integrated Radeon R5 GPU and DDR4 support make it a more modern option for a basic desktop, home theater PC, or office machine that does not require discrete graphics. The A6 also has a lower TDP (65 W vs 80 W), which may appeal to power-conscious builds. However, the data does not show the A6 winning any benchmark, so any recommendation for the A6 must rest on platform features rather than compute performance.

# FAQ

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

A: The Intel Xeon E5530 wins both single-core tests. In Cinebench R20 single-core, it scores 137 vs 136 for the AMD A6-9400 (0.7% higher). In R23 single-core, it scores 328 vs 326 (0.6% higher).

Q: Does the AMD A6-9400 win any benchmark?

A: No. The head-to-head data shows the Xeon E5530 winning all five Cinebench tests, with the A6-9400 trailing by margins between 0.6% and 0.9%.

Q: What memory types do these processors support?

A: The Intel Xeon E5530 supports DDR3 over a triple-channel bus with 25.6 GB/s bandwidth. The AMD A6-9400 supports DDR4 over a dual-channel bus with 38.4 GB/s bandwidth.

Q: Which processor has integrated graphics?

A: Only the AMD A6-9400 has integrated graphics, a Radeon R5 GPU. The Intel Xeon E5530 has no integrated graphics.

Q: Are these processors still in production?

A: The AMD A6-9400 is listed as active production, while the Intel Xeon E5530 is end-of-life.

Q: How do their average benchmark scores compare?

A: The Xeon E5530 has an average benchmark score of 801, while the A6-9400 has 794. The Xeon's nearest rival at that score is the AMD A10-7700K (801), while the A6's nearest rival is the AMD A10-5800B (794).

# Head-to-Head Benchmarks

The Cinebench suite is the only benchmark data available for direct comparison, and it consistently favors the Intel Xeon E5530. The largest margin is in Cinebench R15 multicore, where the Xeon scores 234 against the A6's 232, a 0.9% advantage. This is the only test where the delta exceeds 0.8%. The R20 multicore test shows 977 vs 969, a 0.8% edge. The R23 multicore test is nearly identical in percentage: 2328 vs 2309, again 0.8%.

Single-core results are even closer. In Cinebench R20 single-core, the Xeon scores 137 and the A6 scores 136, a 0.7% difference. In R23 single-core, the Xeon scores 328 and the A6 scores 326, a 0.6% difference. These sub-1% margins are within the noise of any real-world workload, yet the direction is uniform: the Xeon wins every single test.

What makes this interesting is the architectural context. The A6-9400 has a much higher base clock (3.40 GHz vs 2.40 GHz) and a 50% higher memory bandwidth (38.4 GB/s vs 25.6 GB/s). It also uses a newer process node (28 nm vs 45 nm) and has over four times the transistor count (3,100 million vs 731 million). Despite these advantages, it cannot outperform a processor from 2009. The Xeon's 8 threads vs 2 threads likely explains much of the multicore results, but the single-core wins are harder to explain from the specification sheet alone.

One possible interpretation is that the Excavator architecture's per-core performance is simply not competitive with Nehalem on this workload, despite the clock speed advantage. Another is that the Cinebench test itself does not heavily stress memory bandwidth or GPU capabilities, which are the A6's stronger features. Either way, the data shows a clean sweep for the Xeon, even if the practical differences are negligible.

# Specification Differences

The two processors differ in nearly every major specification category. The core and thread counts are the most obvious: the Intel Xeon E5530 has 4 cores and 8 threads, while the AMD A6-9400 has 2 cores and 2 threads. The Xeon's base clock is 2.40 GHz with a boost of 2.67 GHz; the A6 runs at 3.40 GHz base and 3.70 GHz boost. TDP differs as well: 80 W for the Xeon, 65 W for the A6.

The process technology shows a generational gap: 45 nm for Intel vs 28 nm for AMD. Transistor counts are 731 million for the Xeon and 3,100 million for the A6, with die sizes of 263 mm² and 250 mm² respectively. Cache configurations are entirely different: the Xeon uses per-core L1 (64 KB) and L2 (256 KB) plus 8 MB shared L3; the A6 uses 160 KB L1 and 1 MB shared L2 with no L3.

Memory support diverges completely: DDR3 triple-channel (25.6 GB/s) for the Xeon vs DDR4 dual-channel (38.4 GB/s) for the A6. ECC memory is supported on the Xeon but not the A6. PCIe versions differ: Gen 2 for the Xeon, Gen 3 with 8 lanes for the A6. The A6 includes integrated Radeon R5 graphics; the Xeon has none. Sockets are incompatible: Intel Socket 1366 vs AMD Socket AM4. The release dates are a decade apart: March 2009 for the Xeon, March 2019 for the A6. The Xeon has a launch MSRP of $530; the A6 has no listed launch MSRP. The Xeon's part number is SLBF7, the A6's is AD9400AGABBOX. Neither processor has an unlocked multiplier.