AMD Athlon X4 850 vs Intel Xeon X3440 Comparison

The Intel Xeon X3440 and AMD Athlon X4 850 are two end-of-life processors from different eras and market segments, yet benchmark results place them remarkably close in Cinebench workloads. The Xeon, a 2009 server/workstation part built on Intel’s 45nm Nehalem architecture, faces the AMD Athlon X4 850, a 28nm Steamroller desktop chip with a higher clock speed but fewer threads. Across five Cinebench tests, the Intel part wins every round, but the margins are consistently narrow, ranging from 1.1% to 1.4%. This parity is striking given the architectural and temporal gaps, and the data suggests that raw thread count and memory bandwidth play decisive roles.

Head-to-Head Benchmarks

The Intel Xeon X3440 takes a clean sweep of the head-to-head Cinebench suite, but none of the victories are decisive. In Cinebench R15 multi-core, the Xeon scores 238 against the Athlon’s 235, a 1.3% lead. Moving to Cinebench R20 multi-core, the Xeon posts 994 versus 983, a 1.1% advantage. The single-core tests tell the same story: in Cinebench R20 single-core, the Xeon scores 140 to the Athlon’s 138 (1.4% delta), and in R23 single-core, the Xeon’s 334 edges out the Athlon’s 330 (1.2% delta). The largest multi-core gap appears in Cinebench R23 multi-core, where the Xeon’s 2368 beats the Athlon’s 2342 by 1.1%.

The consistency of these margins is notable. Every delta falls between 1.1% and 1.4%, indicating that the two CPUs are effectively matched in Cinebench’s rendering workloads. The Xeon’s advantage likely stems from its 8 threads versus the Athlon’s 4, allowing better utilization of multi-threaded rendering tasks. However, the Athlon’s higher base clock (3.20 GHz versus 2.53 GHz) and boost clock (3.90 GHz versus 2.93 GHz) help it close the gap in single-core tests, where the Xeon still wins by just over 1%. The average benchmark scores reinforce this picture: the Xeon averages 815, while the Athlon averages 806, a difference of only 9 points. Both processors sit at the 22nd percentile of all CPUs, meaning they occupy nearly identical positions in the overall performance distribution.

In the context of their nearest rivals, both chips cluster tightly. The Xeon’s closest competitor is the Intel Core i5-L16G7 with an average score of 816 (a -0.1% delta), followed by the Intel Core 2 Extreme QX9775 and Core i7-5550U, both at 813 (0.2% deltas). The Athlon’s nearest rivals include the Intel Xeon X5482 and AMD Ryzen 3 2200U, both at 805 (0.1% deltas), and the Intel Core i7-870S at 809 (-0.3%). This data shows that neither chip is an outlier; both sit in a crowded mid-range tier where a few points separate many products.

Architecture Differences

The architectural divide between these two processors is substantial. The Intel Xeon X3440 uses the Nehalem architecture on the Lynnfield codename, fabricated on a 45nm process by Intel. It packs 774 million transistors on a 296 mm² die. The AMD Athlon X4 850 uses the Steamroller architecture on the Godaveri codename, built on a 28nm process by GlobalFoundries. Despite the smaller process node, the AMD chip contains 2,411 million transistors on a 245 mm² die, reflecting a denser but more complex design.

Core and thread configurations differ significantly. The Xeon offers 4 cores and 8 threads, enabling simultaneous multi-threading (SMT). The Athlon also has 4 cores but only 4 threads, lacking SMT. This is the most impactful difference for multi-threaded workloads, as the Xeon can process twice as many threads in parallel. Cache hierarchies also diverge. The Xeon has a per-core L1 cache of 64 KB and per-core L2 of 256 KB, plus a shared 8 MB L3 cache. The Athlon’s cache is listed as 256 KB L1 and 4 MB L2, with no L3 cache at all. The Xeon’s larger shared L3 provides a buffer for frequently accessed data across all cores, while the Athlon relies on its L2 alone.

Memory support shows both chips use DDR3 with dual-channel buses, but the bandwidth figures differ sharply. The Xeon delivers 21.3 GB/s, while the Athlon achieves 34.1 GB/s. This 60% higher bandwidth on the AMD part is a significant architectural advantage, potentially improving performance in memory-bound tasks. The Xeon supports ECC memory, a server-oriented feature, while the Athlon does not. PCIe connectivity also differs: the Xeon uses Gen 2 with 16 lanes (CPU only), while the Athlon uses Gen 3 with 16 lanes (CPU only), giving the latter a newer and faster interface.

Other distinctions include socket compatibility (Intel Socket 1156 for the Xeon versus AMD Socket FM2+ for the Athlon), market segment (Server/Workstation versus Desktop), and multiplier unlocking. The Athlon has an unlocked multiplier, allowing overclocking, while the Xeon is locked. The Xeon’s TDP is 95W, whereas the Athlon draws only 65W, making the AMD chip more power-efficient per the data. The Athlon’s process node advantage (28nm versus 45nm) likely contributes to this lower thermal envelope.

Where Each One Wins

The Intel Xeon X3440 wins all five Cinebench tests in the head-to-head comparison, making it the stronger choice for multi-threaded rendering workloads. Its 8 threads provide a clear advantage in Cinebench R15, R20, and R23 multi-core tests, even if the margins are slim. For users running heavily threaded applications like video encoding, 3D rendering, or scientific simulations, the Xeon’s thread count is the decisive factor. The Xeon also holds a narrow edge in single-core tests, suggesting that its older but more efficient core design compensates for the Athlon’s higher clocks in lightly threaded tasks. Its ECC memory support and server market segment make it suitable for workstation reliability scenarios, though its higher TDP (95W versus 65W) means it demands more cooling.

The AMD Athlon X4 850, despite losing every head-to-head test, has clear advantages in specific areas. Its 34.1 GB/s memory bandwidth is substantially higher than the Xeon’s 21.3 GB/s, which could translate to wins in memory-intensive workloads not captured by Cinebench, such as database operations or large data-set processing. The Athlon’s 65W TDP makes it a more efficient choice for compact or thermally constrained builds, and its unlocked multiplier offers overclocking headroom that the locked Xeon lacks. The newer PCIe Gen 3 interface provides faster connectivity for modern GPUs and NVMe drives. For desktop users prioritizing power efficiency, overclocking flexibility, or memory bandwidth over raw multi-threaded CPU performance, the Athlon is the better fit. Its 28nm process also suggests better thermal behavior under sustained loads, even if the benchmark data does not quantify this directly.

FAQ

Q: Which processor has more threads?

A: The Intel Xeon X3440 has 8 threads, while the AMD Athlon X4 850 has only 4 threads. Both have 4 cores.

Q: What is the benchmark score difference in Cinebench R23 multi-core?

A: The Xeon scores 2368, and the Athlon scores 2342, giving the Xeon a 1.1% lead.

Q: Does the AMD Athlon X4 850 support ECC memory?

A: No. The Athlon does not support ECC memory, while the Intel Xeon X3440 does.

Q: Which CPU has a higher memory bandwidth?

A: The AMD Athlon X4 850 has a memory bandwidth of 34.1 GB/s, compared to 21.3 GB/s for the Intel Xeon X3440.

Q: Are the processors unlocked for overclocking?

A: The AMD Athlon X4 850 has an unlocked multiplier, while the Intel Xeon X3440 is locked.

Q: How do their average benchmark scores compare?

A: The Xeon has an average benchmark score of 815, and the Athlon has 806, a difference of 9 points. Both sit at the 22nd percentile of all CPUs.

Specification Differences

| Specification | Intel Xeon X3440 | AMD Athlon X4 850 |

|----------------|------------------|-------------------|

| Threads | 8 | 4 |

| Base Clock | 2.53 GHz | 3.20 GHz |

| Boost Clock | 2.93 GHz | 3.90 GHz |

| TDP | 95W | 65W |

| Socket | Intel Socket 1156 | AMD Socket FM2+ |

| Architecture | Nehalem | Steamroller |

| Codename | Lynnfield | Godaveri |

| Process Node | 45 nm | 28 nm |

| Foundry | Intel | GlobalFoundries |

| Transistors | 774 million | 2,411 million |

| Die Size | 296 mm² | 245 mm² |

| L1 Cache | 64 KB (per core) | 256 KB |

| L2 Cache | 256 KB (per core) | 4 MB |

| L3 Cache | 8 MB (shared) | None |

| Memory Bandwidth | 21.3 GB/s | 34.1 GB/s |

| ECC Memory | Yes | No |

| PCIe | Gen 2, 16 Lanes (CPU only) | Gen 3, 16 Lanes (CPU only) |

| Market Segment | Server/Workstation | Desktop |

| Multiplier Unlocked | No | Yes |

| Launch MSRP | $215 | Not available |

The specification table highlights the fundamental differences: the Xeon trades clock speed and bandwidth for more threads and a shared L3 cache, while the Athlon compensates with higher clocks and superior memory throughput. The Xeon’s launch MSRP was $215, a figure the Athlon lacks in the data. Both processors are end-of-life, but their benchmark parity ensures they remain relevant comparisons for legacy builds.