AMD Ryzen Embedded R1305G vs Intel Xeon W3540 Comparison

The AMD Ryzen Embedded R1305G and the Intel Xeon W3540 represent two very different eras and design philosophies in desktop computing. The R1305G is a modern, ultra-low-power mobile part built on a 14 nm process, while the W3540 is a legacy, high-TDP workstation processor from the 45 nm Nehalem generation. Despite their stark contrasts in age, power, and architecture, the benchmark data reveals a surprisingly close performance contest, with the modern AMD chip narrowly edging out the older Intel part across every single test.

Head-to-Head Benchmarks

The head-to-head data presents a clean sweep for the AMD Ryzen Embedded R1305G, which wins all five Cinebench comparisons. However, the margins are exceptionally tight, making this a far more competitive matchup than the generational gap might suggest. The largest single-core advantage for the R1305G comes in the Cinebench R23 single-core test, where it scores 377 against the Xeon W3540's 374. This 3-point difference translates to a delta of 0.8%, which is the biggest percentage win for AMD in the entire comparison. In the R20 single-core test, the R1305G again leads, posting 158 points to the W3540's 157, a 0.6% advantage.

The multicore results follow the same pattern. In Cinebench R15 multicore, the R1305G scores 269, narrowly beating the Xeon's 267, a 0.7% delta. The R20 multicore test shows a similar story, with the AMD part scoring 1121 versus the Intel's 1113, also a 0.7% lead. The R23 multicore benchmark, which is more demanding, sees the R1305G score 2670 compared to the W3540's 2652, again a 0.7% advantage for the AMD chip. These results are striking because the Xeon W3540 has double the cores and threads (4 cores/8 threads vs. 2 cores/4 threads) and significantly higher base and boost clock speeds (2.93 GHz base/3.20 GHz boost vs. 1.50 GHz base/2.80 GHz boost). The fact that the 2-core AMD part can match and slightly surpass the 4-core Intel part in heavily threaded workloads underscores the massive instruction-per-clock (IPC) advancements made in the decade separating these two architectures.

Looking at the overall average benchmark scores, the R1305G holds a 919 average compared to the W3540's 913. Both processors sit at the 24th percentile of all CPUs in the database, indicating they are entry-level performers in the grand scheme of modern computing. The nearest rivals for the AMD chip include the AMD PRO A10-9700E (matching at 919, 0% delta), the AMD Athlon Silver 3050U (917, 0.2% slower), and the Intel Pentium Gold G6405T (915, 0.5% slower). The Xeon W3540's closest competitor is that same Pentium Gold G6405T, which is 0.2% faster, alongside the AMD PRO A12-9800E (910, 0.3% faster) and the AMD Ryzen 3 3250U (908, 0.5% faster). This data places both chips in a very tight performance cluster, where a few points separate them from their direct contemporaries.

FAQ

Q: Which processor is faster in multi-core Cinebench R20 benchmarks?

A: The AMD Ryzen Embedded R1305G is the winner, scoring 1121 points compared to the Intel Xeon W3540's 1113 points. This represents a 0.7% performance advantage for the AMD chip.

Q: How do the single-core scores compare between these two CPUs?

A: The AMD Ryzen Embedded R1305G leads in both available single-core tests. In Cinebench R20 single-core, it scores 158 versus the Xeon's 157 (a 0.6% lead), and in R23 single-core, it scores 377 versus 374 (a 0.8% lead).

Q: Does the Intel Xeon W3540 have more cores than the AMD R1305G?

A: Yes. The Intel Xeon W3540 has 4 cores and 8 threads, while the AMD Ryzen Embedded R1305G has 2 cores and 4 threads. Despite this, the AMD chip still manages to win all multicore benchmarks in this comparison.

Q: What are the TDP (Thermal Design Power) specifications for each processor?

A: The AMD Ryzen Embedded R1305G has a very low TDP of 10 watts, making it suitable for fanless or passively cooled systems. In contrast, the Intel Xeon W3540 has a significantly higher TDP of 130 watts, requiring robust active cooling solutions.

Q: Which processor supports ECC memory?

A: The Intel Xeon W3540 supports ECC memory, while the AMD Ryzen Embedded R1305G does not. This makes the Intel part more suitable for error-critical workstation or server applications.

Q: What is the production status of each chip?

A: The AMD Ryzen Embedded R1305G is listed as "Active" in production, while the Intel Xeon W3540 is marked as "End-of-life." The AMD chip is a current product, whereas the Intel chip is a legacy part.

Where Each One Wins

The AMD Ryzen Embedded R1305G wins in every single benchmark category where both processors were tested. It takes the crown in Cinebench R15 multicore (269 vs 267), R20 multicore (1121 vs 1113), R20 singlecore (158 vs 157), R23 multicore (2670 vs 2652), and R23 singlecore (377 vs 374). This clean sweep makes it the outright performance winner for all compute-intensive tasks, regardless of whether they are single-threaded or multi-threaded workloads. The data indicates that the modern Zen architecture's efficiency and IPC improvements completely offset the Xeon W3540's raw core-count and clock-speed advantages.

The Intel Xeon W3540, despite losing all head-to-head matchups, still has a clear strategic advantage in specific deployment scenarios. Its support for ECC memory is a definitive feature that the AMD chip lacks. For applications where data integrity is paramount—such as financial modeling, scientific computing, or running a home server with ZFS—the W3540 is the only one of the two that can be used. Additionally, its "Server/Workstation" market segment classification, while not a performance metric, indicates it was designed for sustained, always-on operation in a way that the R1305G, classified as "Mobile," was not. The W3540's triple-channel memory bus also provides a wider path for memory bandwidth, although the peak bandwidth figure is not provided in the data for a direct comparison.

Specification Differences

The specification sheet reveals fundamental differences between these two processors. The AMD Ryzen Embedded R1305G has 2 cores and 4 threads, while the Intel Xeon W3540 doubles that with 4 cores and 8 threads. Clock speeds also differ significantly: the R1305G has a base clock of 1.50 GHz and a boost clock of 2.80 GHz, whereas the W3540 runs at a much higher base of 2.93 GHz and boosts to 3.20 GHz. The TDP disparity is enormous, with the R1305G drawing a mere 10 watts compared to the W3540's 130 watts. They use different sockets (AMD Socket FP5 vs. Intel Socket 1366) and support different memory types (DDR4 dual-channel vs. DDR3 triple-channel). The AMD chip provides a memory bandwidth of 38.4 GB/s, while the Intel part's bandwidth is not listed. ECC memory support is exclusive to the Intel Xeon. They also differ in PCIe generation: the R1305G supports PCIe Gen 3 with 8 lanes (CPU only), while the W3540 supports the older PCIe Gen 2 standard. Finally, the R1305G includes integrated Radeon Vega 3 graphics, whereas the W3540 has no integrated graphics at all.

Architecture Differences

The architectural gap between these two CPUs is vast, reflecting over a decade of semiconductor evolution. The AMD Ryzen Embedded R1305G is built on the "Zen" architecture (codenamed "Banded Kestrel") using a 14 nm process node at GlobalFoundries. It contains 3,500 million transistors on a 148 mm² die. Its cache hierarchy consists of 96 KB of L1 cache per core, 512 KB of L2 cache per core, and 4 MB of shared L3 cache. It was released in 2020 and is part of the Ryzen Embedded 1000 series.

In contrast, the Intel Xeon W3540 is based on the Nehalem architecture (codenamed "Bloomfield"), manufactured on Intel's 45 nm process. This older processor has 731 million transistors on a much larger 263 mm² die. Its cache configuration is different: 64 KB of L1 cache per core, 256 KB of L2 cache per core, and a larger 8 MB of shared L3 cache. It was released in 2009, making it over a decade older than the AMD part. The R1305G's smaller, denser 14 nm process allows it to achieve comparable performance with far fewer cores and a dramatically lower power draw. The Xeon's larger L3 cache (8 MB vs 4 MB) is a point in its favor, but the AMD part's superior Zen microarchitecture appears to compensate for this deficit in the benchmark results.