AMD Opteron 6378 vs Intel Xeon E3-1505L v5 Comparison

The AMD Opteron 6378 and Intel Xeon E3-1505L v5 are separated by a decade of design philosophy, yet the benchmark data places them in a statistical dead heat. The Opteron is a 16-core server monster from the Piledriver era, while the Xeon is a low-power 4-core Skylake part for compact workstations. Their average benchmark scores are nearly identical (1447 vs 1446), and the data shows that the Opteron wins all six head-to-head Cinebench tests by margins of 0.0% to 0.2%. The real story is not who wins, but how each chip achieves the same result through fundamentally different means.

Head-to-Head Benchmarks

The Cinebench results are remarkably tight across every test. In Cinebench R15 multi-core, the Opteron 6378 scores 504 against the Xeon's 503, a 0.2% advantage. Single-core in R15 is a perfect tie at 71 points each, with a 0% delta. Moving to Cinebench R20, the Opteron leads 2102 to 2099 in multi-core (0.1% delta) and ties again in single-core at 296. The R23 results follow the same pattern: the Opteron scores 5005 multi-core versus 4999 for the Xeon (0.1% delta), and 706 single-core versus 705 (0.1% delta).

These margins are within run-to-run noise, but the direction is consistent. The Opteron wins all six tests, though never by more than 0.2%. The Xeon's 4 cores and 8 threads manage to keep pace with the Opteron's 16 cores and 16 threads across every workload. This reflects the massive IPC advantage of Skylake over Piledriver. The Opteron's boost clock of 3.30 GHz is higher than the Xeon's 2.80 GHz, but the Xeon's per-core efficiency closes the gap entirely.

The average benchmark score places both processors at the 38th percentile among all CPUs. The Opteron averages 1447, and the Xeon averages 1446. Their nearest rival, the Intel Core i5-7300HQ, scores 1448, which is 0.1% higher than the Opteron. The AMD Ryzen 3 2200GE sits at 1444 (0.2% behind the Opteron), and the AMD Ryzen 5 2400G at 1439 (0.6% behind). These figures show both chips landing in a dense cluster of mid-range processors from different generations.

The Verdict

From the data alone, there is no winner on raw performance. The Opteron 6378 edges ahead in every single benchmark, but the largest margin is 0.2%, which is negligible in real-world use. The decision comes down to platform requirements and power constraints.

The Xeon E3-1505L v5 is the clear choice for compact, power-sensitive systems. Its 25W TDP is dramatically lower than the Opteron's 115W, and it includes integrated HD Graphics P530, which the Opteron lacks entirely. The Xeon also supports both DDR3 and DDR4 memory, offers PCIe Gen 3 with 16 CPU lanes, and comes in a BGA 1440 package that is soldered to the board. This is a chip designed for laptops, mini-PCs, and embedded workstations where space and thermals dominate.

The Opteron 6378 is for legacy server platforms that need raw multi-threaded throughput and have the infrastructure to handle it. Its 16 cores provide the same Cinebench scores as the Xeon, but it consumes 4.6 times the power to do so. The Opteron requires an AMD Socket G34 motherboard with quad-channel DDR3 memory, delivering 59.7 GB/s of bandwidth versus the Xeon's 34.1 GB/s. If you already own a G34 platform, the Opteron makes sense. If you are building new, the Xeon's efficiency and modern feature set are more practical.

Architecture Differences

The Opteron 6378 is built on AMD's Piledriver architecture, codenamed Abu Dhabi, using a 32nm process from GlobalFoundries. It packs 2,400 million transistors across a dual-die design with a total die size of 2x 315 mm². The cache hierarchy is module-based: 768 KB of L1, 2 MB of L2 per module, and 8 MB of L3 per die. This is a multi-chip module design where each die has its own memory controller and cache.

The Xeon E3-1505L v5 uses Intel's Skylake architecture, specifically the Skylake-H variant, on a 14nm process from Intel. It integrates 2,300 million transistors on a single 122 mm² die. The cache layout is per-core: 64 KB of L1 per core, 256 KB of L2 per core, and 8 MB of shared L3. This monolithic design is far more power-efficient and delivers significantly higher instructions per clock.

The process node difference is stark: 32nm versus 14nm. This explains the TDP gap of 115W versus 25W. The Opteron uses a dual-die approach to reach 16 cores, while the Xeon achieves comparable multi-threaded results with just 4 cores and 8 threads. The Opteron supports quad-channel DDR3 memory only, while the Xeon supports both DDR3 and DDR4 in dual-channel configuration. The Xeon also includes PCIe Gen 3, whereas the Opteron is limited to Gen 2.

FAQ

Q: Which processor has more cores?

A: The AMD Opteron 6378 has 16 cores and 16 threads. The Intel Xeon E3-1505L v5 has 4 cores and 8 threads.

Q: Do they perform the same in Cinebench?

A: Yes, nearly identically. The Opteron wins all six Cinebench tests, but the largest margin is 0.2%. In R15 single-core and R20 single-core, they tie exactly at 71 and 296 points, respectively.

Q: Which chip uses less power?

A: The Xeon E3-1505L v5 has a TDP of 25W, while the Opteron 6378 has a TDP of 115W. The Xeon consumes significantly less power.

Q: Do either of these processors have integrated graphics?

A: Only the Intel Xeon E3-1505L v5 has integrated graphics, specifically HD Graphics P530. The AMD Opteron 6378 has no integrated graphics.

Q: What memory types does each support?

A: The Opteron 6378 supports DDR3 only with a quad-channel memory bus (59.7 GB/s bandwidth). The Xeon E3-1505L v5 supports both DDR3 and DDR4 with a dual-channel memory bus (34.1 GB/s bandwidth).

Q: Which processor has a higher boost clock?

A: The AMD Opteron 6378 boosts up to 3.30 GHz, while the Intel Xeon E3-1505L v5 boosts up to 2.80 GHz.

Where Each One Wins

The Opteron 6378 wins in multi-threaded throughput, but only marginally. Its 16 cores deliver 504 in Cinebench R15 multi-core versus 503 for the Xeon, and 2102 in R20 multi-core versus 2099. The Opteron's advantage in memory bandwidth is substantial: 59.7 GB/s from quad-channel DDR3 versus 34.1 GB/s from dual-channel on the Xeon. This makes the Opteron preferable for workloads that are sensitive to memory bandwidth, such as large database operations or virtual machine hosts that need to move data between many cores.

The Xeon E3-1505L v5 wins on efficiency and platform flexibility. Its 25W TDP allows for passive cooling in many chassis, and its BGA 1440 package is designed for compact, integrated systems. The Xeon supports both DDR3 and DDR4, which means it can be dropped into a wider range of existing boards. Its PCIe Gen 3 support provides double the bandwidth of the Opteron's Gen 2, which matters for modern NVMe storage and high-end GPUs. The integrated HD Graphics P530 eliminates the need for a discrete GPU in basic display scenarios.

For single-threaded tasks, the results are effectively tied. Both chips score 71 in Cinebench R15 single-core and 296 in R20 single-core. The Opteron's higher boost clock of 3.30 GHz compensates for the Xeon's superior IPC, resulting in a draw. The Xeon's per-core cache (256 KB L2 per core) provides lower latency for individual threads, while the Opteron's module-based design shares L2 between pairs of cores.

Specification Differences

The core count difference is the most obvious: 16 cores and 16 threads for the Opteron versus 4 cores and 8 threads for the Xeon. The base clocks are 2.40 GHz for the Opteron and 2000.00 MHz for the Xeon, with boost clocks of 3.30 GHz and 2.80 GHz, respectively. The TDP gap is enormous: 115W for the Opteron, 25W for the Xeon.

The sockets are incompatible: AMD Socket G34 for the Opteron, Intel BGA 1440 for the Xeon. The Opteron uses the Piledriver architecture on a 32nm process, while the Xeon uses Skylake on 14nm. The Opteron has a dual-die design (2x 315 mm²) with 2,400 million transistors; the Xeon has a single 122 mm² die with 2,300 million transistors.

Memory support differs: the Opteron is DDR3-only with quad-channel (59.7 GB/s), while the Xeon supports DDR3 and DDR4 with dual-channel (34.1 GB/s). Both support ECC memory. The Opteron uses PCIe Gen 2, while the Xeon uses Gen 3 with 16 CPU lanes. The Xeon includes HD Graphics P530; the Opteron has no integrated graphics.

The release dates are three years apart: the Opteron launched in November 2012, the Xeon in October 2015. The Opteron's launch MSRP was $867, while the Xeon's was $433. Both are now end-of-life products. The Opteron's part number is OS6378WKTGGHK, and the Xeon's is SR2E0. Neither processor has an unlocked multiplier.