Intel Xeon D-1581 vs Intel Xeon E5-2676 v3 Comparison

Head-to-Head Benchmarks

The recorded data shows a clean sweep for the Intel Xeon D-1581 across all six Cinebench comparisons. In multi-core workloads, the D-1581 leads by 2.4% in both Cinebench R15 (1128 vs 1102) and Cinebench R20 (4702 vs 4592), while the R23 multi-core test shows a 2.4% advantage as well (11197 vs 10935). These are consistent margins, suggesting the D-1581's advantage scales uniformly across rendering workloads.

Single-core results follow the same pattern. The D-1581 wins Cinebench R15 single-core by 2.6% (159 vs 155), R20 single-core by 2.3% (663 vs 648), and R23 single-core by 2.4% (1580 vs 1543). The single-core deltas are nearly identical to the multi-core deltas, which is notable because it indicates the D-1581's lead is not purely a core-count effect. The Xeon E5-2676 v3 has a higher base clock (2.40 GHz vs 1.80 GHz) and a higher boost clock (3.00 GHz vs 2.40 GHz), yet it still trails in every single-threaded test.

The overall average benchmark score places the D-1581 at 3238 against 3163 for the E5-2676 v3, a difference of roughly 2.4%. Both CPUs sit at the 53rd percentile among all recorded processors, meaning they occupy the same performance tier in the database. The D-1581's nearest rivals include the AMD Ryzen 5 1600X (3249, delta -0.3%), the AMD Ryzen 7 4800U (3218, delta 0.6%), and the AMD Ryzen 3 PRO 5350GE (3218, delta 0.6%). The E5-2676 v3, by contrast, sits alongside the AMD Ryzen 5 5560U (3162, delta 0%), the AMD Ryzen 3 5300GE (3160, delta 0.1%), and the AMD Ryzen 7 PRO 5850U (3159, delta 0.1%). The D-1581's rival cluster is marginally faster on average, but the deltas among all nearest rivals are small, within 1%.

In the head-to-head table, the D-1581 wins all six tests. The smallest margin is 2.3% in R20 single-core; the largest is 2.6% in R15 single-core. There is no test where the E5-2676 v3 overtakes the D-1581. The data does not show any workload type where the E5-2676 v3's higher clocks or larger shared cache translate into a benchmark win.

Architecture Differences

The two processors come from different Intel microarchitectures and are built for different sockets. The D-1581 is a Broadwell-DE part, fabricated on a 14 nm process, and uses the Intel BGA 1667 socket. The E5-2676 v3 is a Haswell-EP part, fabricated on a 22 nm process, and uses the Intel Socket 2011-3. The process node difference is significant: 14 nm versus 22 nm, which helps explain why the D-1581 achieves competitive performance at a much lower power envelope.

Core and thread counts differ. The D-1581 has 16 cores and 32 threads, while the E5-2676 v3 has 12 cores and 24 threads. That is a 4-core, 8-thread advantage for the D-1581. Yet the multi-core benchmark deltas are only around 2.4%, not the 33% core-count advantage one might expect. This is where the clock speeds matter. The E5-2676 v3 runs at 2.40 GHz base and 3.00 GHz boost, versus 1.80 GHz base and 2.40 GHz boost for the D-1581. The E5-2676 v3's higher clocks partially offset its fewer cores, compressing the multi-core performance gap.

Cache configurations are markedly different. The D-1581 has 64 KB of L1 per core, 256 KB of L2 per core, and 1.5 MB of L3 per core, which for 16 cores implies a distributed L3 layout. The E5-2676 v3 has the same per-core L1 and L2 sizes but a shared 30 MB L3 pool. The shared pool on the E5-2676 v3 is a classic server design that can benefit workloads with shared data access patterns, though the benchmark results do not show a decisive advantage in the Cinebench suite.

Memory support is another differentiator. Both support DDR3 and DDR4, and both support ECC memory. The D-1581 uses a dual-channel memory bus, while the E5-2676 v3 uses a quad-channel bus with a recorded memory bandwidth of 68.3 GB/s. The E5-2676 v3's memory subsystem is clearly wider, but Cinebench is not memory-bandwidth sensitive enough to reflect this in the scores. PCIe lane counts also differ: the D-1581 provides 24 PCIe Gen 3 lanes, while the E5-2676 v3 provides 40 PCIe Gen 3 lanes. For I/O-heavy server workloads, the E5-2676 v3 has more expansion headroom.

Transistor counts and die sizes reflect the different process generations. The D-1581 packs 3,200 million transistors into a 246 mm² die. The E5-2676 v3 has 2,600 million transistors on a 356 mm² die. The D-1581 achieves higher transistor density on the newer process, which contributes to its lower 65 W TDP versus the E5-2676 v3's 120 W TDP. The production status also differs: the D-1581 is listed as Active, while the E5-2676 v3 is End-of-life. The D-1581's release date is recorded as 2016-02-23; no release date is recorded for the E5-2676 v3.

Neither chip has integrated graphics, and neither has an unlocked multiplier. Both are aimed at the server and workstation segment. The D-1581's part number is SR2LZ, and the E5-2676 v3's is SR1Y5.

Where Each One Wins

Based strictly on the recorded benchmark data, the Intel Xeon D-1581 wins every single comparison. There is no test in the head-to-head set where the E5-2676 v3 comes out ahead. The D-1581's wins are consistent across both single-core and multi-core Cinebench versions, which suggests it is the stronger processor for CPU-bound rendering and general compute tasks.

The E5-2676 v3 does have structural advantages that are not reflected in Cinebench scores. Its quad-channel memory bus with 68.3 GB/s bandwidth is a clear capability win for memory-intensive server applications, and its 40 PCIe Gen 3 lanes provide more I/O expansion than the D-1581's 24 lanes. For workloads that stress memory bandwidth or need many attached devices, the E5-2676 v3's platform features are more substantial. However, the database does not include benchmark results for those workload types, so these remain qualitative observations.

The D-1581's 65 W TDP is nearly half the E5-2676 v3's 120 W TDP. In dense server deployments where power and cooling are constrained, the D-1581's efficiency profile is a meaningful advantage. The D-1581 also remains in Active production status, whereas the E5-2676 v3 is End-of-life, which can matter for long-term procurement and support planning.

The percentile data places both at the 53rd percentile, so neither is a standout performer in the broader CPU landscape. The D-1581's average benchmark score of 3238 is slightly above its nearest rivals, while the E5-2676 v3's 3163 is essentially tied with its nearest rival, the AMD Ryzen 5 5560U, at a delta of 0%. The E5-2676 v3's rival cluster includes the Intel Xeon E5-2650 v4 at 3154, a delta of 0.3%, which is a same-family alternative.

The Verdict

The data points to the Intel Xeon D-1581 as the faster processor in every measured benchmark. Its 16 cores and 32 threads, combined with the 14 nm process, deliver a 2.4% multi-core lead and a 2.3% to 2.6% single-core lead over the E5-2676 v3 across all Cinebench versions. For workloads that resemble Cinebench, which is to say heavily threaded rendering and compute tasks, the D-1581 is the clear pick.

The E5-2676 v3 is not without merits. Its 12 cores run at higher clocks, its shared 30 MB L3 cache is larger in absolute terms than the D-1581's per-core arrangement, and its quad-channel memory bus with 68.3 GB/s bandwidth is a platform-level advantage. Its 40 PCIe Gen 3 lanes also support more expansion. For server roles that involve high memory throughput or many I/O devices, the E5-2676 v3's architecture remains competitive despite losing the compute benchmarks.

That said, the E5-2676 v3 is End-of-life, consumes 120 W, and sits on a 22 nm process. The D-1581 is Active, consumes 65 W, and uses the newer 14 nm node. The D-1581 wins on performance, efficiency, and production status. The only scenario where the E5-2676 v3 makes sense is one where its quad-channel memory bandwidth and 40 PCIe lanes are essential, but the database does not provide benchmark evidence that those features translate into higher scores.

For a buyer choosing between these two for general server compute, the D-1581 is the better choice. For a buyer with specific memory-bandwidth or I/O-expansion needs, the E5-2676 v3's platform capabilities warrant consideration, but the recorded compute benchmarks all favor the D-1581.

FAQ

Q: Which processor wins the most benchmarks in the head-to-head comparison?

A: The Intel Xeon D-1581 wins all six head-to-head benchmarks, covering Cinebench R15, R20, and R23 in both single-core and multi-core tests.

Q: What is the largest performance margin between the two CPUs?

A: The largest margin is 2.6% in Cinebench R15 single-core, where the D-1581 scores 159 against 155 for the E5-2676 v3.

Q: How do the core counts and clock speeds compare?

A: The D-1581 has 16 cores and 32 threads with a 1.80 GHz base and 2.40 GHz boost. The E5-2676 v3 has 12 cores and 24 threads with a 2.40 GHz base and 3.00 GHz boost.

Q: Which processor has higher memory bandwidth?

A: The E5-2676 v3 has a quad-channel memory bus with a recorded bandwidth of 68.3 GB/s. The D-1581 uses a dual-channel bus with no bandwidth figure recorded.

Q: Are both CPUs still in production?

A: No. The D-1581 is listed as Active, while the E5-2676 v3 is End-of-life.

Q: How do the two CPUs compare in power consumption?

A: The D-1581 has a TDP of 65 W, while the E5-2676 v3 has a TDP of 120 W, making the D-1581 the lower-power part by a substantial margin.