CPU Comparison

The Intel Atom C5315 and Intel Xeon X3460 are two server-oriented processors separated by over a decade of silicon evolution, yet their benchmark scores land them in the same performance class. The Atom edges out the older Xeon in every measured Cinebench test, though the margins are razor-thin. The verdict is straightforward: the Atom C5315 is the better performer in purely synthetic workloads, but the Xeon X3460 retains relevance through its higher thread count and larger shared cache. The data shows a statistical tie in average benchmark score, with the Atom at 871 and the Xeon at 866. For new deployments requiring low power and modern platform features, the Atom wins; for legacy socket compatibility or threaded workloads that scale with eight threads, the Xeon remains a viable option.

The Verdict

The benchmark results are unambiguous: the Intel Atom C5315 wins all five head-to-head Cinebench comparisons against the Intel Xeon X3460. The largest margin is a 0.8% win in Cinebench R15 multicore (255 vs 253), while the other four tests show either 0.6% or 0.0% deltas. This is not a decisive victory in raw performance terms, the average benchmark scores are 871 for the Atom and 866 for the Xeon, a difference of only 0.5%. The Atom's percentile ranking sits at 23, identical to the Xeon's 23, placing both in the same tier of all CPUs tracked.

Who should pick which? The Atom C5315 is the clear choice for anyone prioritizing a modern, active production part with a 38W TDP versus the Xeon's 95W. The Atom also offers a 10nm process node, DDR4 memory support with 38.4 GB/s bandwidth, and PCIe Gen 3 connectivity. The Xeon X3460, while end-of-life, brings 8 threads (double the Atom's 4), a 3.47 GHz boost clock, and 8 MB of shared L3 cache. If the workload is heavily multithreaded and can exploit more than four threads, the Xeon's architecture may compensate for its lower per-core efficiency, but the Cinebench multicore scores suggest otherwise, with the Atom leading by 0.6% to 0.8% even in those tests. The data favors the Atom for nearly every scenario, except for those specifically requiring the Xeon's Socket 1156 platform or its larger L3 cache.

Architecture Differences

The architectural gap between these two chips is vast. The Intel Atom C5315 is built on a 10nm process under the Parker Ridge codename, part of the Atom (Tremont) generation. It has 4 cores and 4 threads, with no boost clock, a fixed 2.40 GHz base frequency. Its cache hierarchy is unusual: 64 KB of L1 per core and 4.5 MB of L2 per module, with no L3 cache. The Xeon X3460, by contrast, is a 45nm Nehalem part codenamed Lynnfield, featuring 4 cores and 8 threads via Hyper-Threading. It runs at a 2.80 GHz base clock with a 3.47 GHz boost, and packs 774 million transistors on a 296 mm² die. Its cache layout is more conventional: 64 KB L1 per core, 256 KB L2 per core, and 8 MB of shared L3.

Memory support differs significantly. The Atom uses dual-channel DDR4 with a theoretical bandwidth of 38.4 GB/s, while the Xeon uses dual-channel DDR3 at 21.3 GB/s, an 80% bandwidth advantage for the Atom. Both support ECC memory, a key feature for server workloads. PCIe capabilities also diverge: the Atom provides Gen 3 with 8 lanes (CPU only), whereas the Xeon offers Gen 2 with 16 lanes. The Atom has no integrated graphics, and the Xeon's integrated graphics field is null, neither relies on an iGPU. The Atom's TDP is a modest 38W, while the Xeon draws 95W, a significant efficiency gap given their similar performance levels. The Xeon's production status is end-of-life, released in September 2009, while the Atom is active, released in June 2022.

Head-to-Head Benchmarks

The Cinebench suite reveals a consistent but narrow pattern of Atom superiority. In Cinebench R15 multicore, the Atom scores 255 against the Xeon's 253, a 0.8% delta, the largest gap in either direction. Moving to Cinebench R20 multicore, the Atom posts 1063 versus 1057, a 0.6% advantage. The single-core R20 test is a dead heat: both chips score exactly 149, a 0% delta. In Cinebench R23 multicore, the Atom leads 2533 to 2518, again by 0.6%. The R23 single-core test shows the Atom at 357 and the Xeon at 355, a 0.6% edge. Across all five tests, the Atom wins five and the Xeon wins zero.

These margins are small but consistent, suggesting the Atom's newer architecture and higher memory bandwidth provide a slight edge in Cinebench's rendering workloads. The Xeon's advantage in boost clock (3.47 GHz vs 2.40 GHz) and thread count (8 vs 4) does not translate to wins, likely due to the Atom's superior IPC from the Tremont core design and faster memory subsystem. The nearest rival data reinforces this closeness: the Atom's nearest rival list includes the Xeon X3460 at a 0.5% delta, while the Xeon's list includes the Atom at a -0.6% delta. Both chips also cluster near the Intel Core i7-3540M (867 average score) and other mid-range parts, confirming their placement in a tight performance band.

FAQ

Q: Which CPU has higher multi-core performance in Cinebench R23?

A: The Intel Atom C5315 edges out the Intel Xeon X3460 with a score of 2533 versus 2518, a 0.6% difference.

Q: Do these processors support ECC memory?

A: Yes, both the Intel Atom C5315 and the Intel Xeon X3460 support ECC memory, making either suitable for error-correcting server workloads.

Q: What is the TDP difference between the two?

A: The Intel Atom C5315 has a TDP of 38W, while the Intel Xeon X3460 has a TDP of 95W, a substantial 57W gap that favors the Atom in power-constrained environments.

Q: How do they compare on single-core performance?

A: In Cinebench R20 single-core, both score exactly 149, a tie. In R23 single-core, the Atom leads 357 to 355, a 0.6% margin.

Q: Which CPU has more threads?

A: The Intel Xeon X3460 has 8 threads (4 cores with Hyper-Threading), while the Intel Atom C5315 has 4 threads (4 cores without). Despite this, the Atom wins all multicore benchmarks.

Q: Are both CPUs still in production?

A: No. The Intel Atom C5315 is listed as Active, while the Intel Xeon X3460 is End-of-life. The Atom was released in June 2022; the Xeon launched in September 2009.

Where Each One Wins

The Intel Atom C5315 wins in every benchmark category measured, but its victories are narrow. Its most significant strength lies in efficiency: a 38W TDP versus the Xeon's 95W delivers similar performance at less than half the power draw. The Atom also dominates memory bandwidth, offering 38.4 GB/s through DDR4 versus the Xeon's 21.3 GB/s via DDR3. This bandwidth advantage likely explains its consistent, if small, Cinebench wins, rendering tasks often benefit from faster memory access. The Atom's 10nm process and active production status make it the forward-looking choice for new server builds, particularly in dense or low-power environments.

The Intel Xeon X3460's case rests on legacy and specific architectural features. It offers 8 threads, which may provide better responsiveness in workloads that can utilize simultaneous multithreading, even if Cinebench does not reflect this advantage. Its 8 MB shared L3 cache is significantly larger than the Atom's L2-only design (4.5 MB per module), which could benefit datasets that fit within that cache. The Xeon also provides 16 PCIe Gen 2 lanes versus the Atom's 8 Gen 3 lanes, the Xeon's lane count is double, though the Atom's lanes are faster per-lane. For anyone upgrading an existing Socket 1156 system, the Xeon is the only drop-in option. Its $316 launch MSRP versus the Atom's $213 launch MSRP reflects its original high-end positioning, though the Atom's price advantage is now moot given the Xeon's end-of-life status.

In practical terms, the Atom C5315 is the winner for new deployments, edge computing, or any scenario where power efficiency and modern platform features matter. The Xeon X3460 retains value only for legacy socket compatibility or specific workloads that exploit its 8 threads and large L3 cache, though the benchmark data suggests such workloads are rare, given the Atom's multicore victories. The data shows a clear, if narrow, overall victory for the Atom C5315.