Intel Core i5-6600 vs Intel Xeon E3-1241 v3 Comparison

The Intel Xeon E3-1241 v3 is the outright performance winner in this comparison, taking all six head-to-head benchmark contests against the Intel Core i5-6600. The data shows a consistent 17.7% advantage for the Xeon across both single-core and multi-core Cinebench tests, a margin that stems from its Hyper-Threading support and higher base clock. However, the Core i5-6600 counters with a dramatically lower 35W TDP, a newer 14nm process node, and support for both DDR3 and DDR4 memory, making it the more modern and power-efficient platform despite its lower raw scores.

Where Each One Wins

The Xeon E3-1241 v3 wins every single benchmark in the head-to-head comparison, but the nature of those wins splits into two distinct categories. In multi-threaded workloads, the Xeon's 8 threads versus the i5's 4 threads deliver a clear advantage: Cinebench R23 multi-core shows 6072 points versus 5161, a 17.7% lead. This makes the Xeon the choice for rendering, video encoding, and any heavily parallel task where extra threads translate directly into shorter completion times.

In single-threaded tests, the Xeon also wins, but the margin is identical at 17.7% across all Cinebench versions (R15, R20, R23). This is notable because both CPUs have the same 3.90 GHz boost clock; the Xeon's edge comes from its higher 3.50 GHz base clock and older Haswell architecture, which still outperforms the Skylake i5 in these specific tests. For users whose software relies on single-core performance, the Xeon remains the faster part.

The Core i5-6600's wins are not in benchmarks but in platform characteristics. It is the only one of the two with integrated graphics (UHD Graphics 530), enabling a build without a discrete GPU. Its 35W TDP is less than half the Xeon's 80W, which translates to lower cooling requirements and potentially quieter operation. The i5 also supports DDR4 memory alongside DDR3, offering access to newer memory technology and a higher theoretical memory bandwidth of 34.1 GB/s compared to the Xeon's 25.6 GB/s.

Architecture Differences

The two processors come from different Intel generations and are built on different process nodes. The Xeon E3-1241 v3 uses the Haswell architecture on a 22 nm process with a die size of 160 mm² and 1,400 million transistors. The Core i5-6600 uses the newer Skylake architecture on a 14 nm process with a slightly larger die at 177 mm²; transistor count is not listed for the i5. This process shrink is the primary reason the i5 achieves its much lower 35W TDP while still reaching the same 3.90 GHz boost clock.

Core and thread counts differ significantly. The Xeon has 4 cores and 8 threads, while the i5 has 4 cores and 4 threads. The Xeon's Hyper-Threading effectively doubles its thread count, which is the dominant factor in its multi-core benchmark wins. Cache configurations also differ: the Xeon has 8 MB of shared L3 cache, while the i5 has 6 MB. Both have identical L1 (64 KB per core) and L2 (256 KB per core) caches.

Memory support is a major divergence. The Xeon supports only DDR3 with a dual-channel bus and 25.6 GB/s bandwidth, and it supports ECC memory. The i5 supports both DDR3 and DDR4, also dual-channel, but with a higher 34.1 GB/s bandwidth and no ECC support. The Xeon is socketed for Intel Socket 1150, while the i5 uses Intel Socket 1151, meaning they are not interchangeable on the same motherboard.

The Xeon is a server/workstation part with no integrated graphics, while the i5 is a desktop part with UHD Graphics 530. Both have PCIe Gen 3 with 16 lanes (CPU only). Neither has an unlocked multiplier. The Xeon was released in May 2014 with a launch MSRP of $273; the i5 was released in June 2015 with a launch MSRP of $224.

Head-to-Head Benchmarks

The head-to-head data is remarkably consistent: the Xeon E3-1241 v3 wins every test by exactly 17.7%, with one exception. In Cinebench R15 multi-core, the Xeon scores 612 against the i5's 520, a 17.7% delta. In R15 single-core, it's 86 versus 73, also 17.7%. This pattern holds for R20 (2550 vs 2167 multi-core; 359 vs 305 single-core) and R23 (6072 vs 5161 multi-core; 857 vs 728 single-core).

The consistency of the 17.7% delta across both single-core and multi-core tests suggests that the Xeon's advantage is not solely from its extra threads. If the win were purely thread-count-driven, the multi-core delta would be larger than the single-core delta. Instead, the Xeon's higher base clock (3.50 GHz vs 3.30 GHz) and architectural efficiency appear to give it a per-core performance lead that is then amplified by Hyper-Threading in multi-core tests, yet the measured delta remains uniform at 17.7%.

The i5-6600 does have additional benchmark data not available for the Xeon: Geekbench multi-core scores 3755 and single-core scores 1239. These scores cannot be directly compared to the Xeon because no Geekbench results are listed for the Xeon in this dataset. The overall average benchmark scores are close: the Xeon averages 1756 points, while the i5 averages 1744 points, a difference of just 0.7%. Both processors sit at the 41st percentile among all CPUs, indicating they are in the same performance tier overall despite the Xeon's Cinebench dominance.

FAQ

Q: Does the Intel Xeon E3-1241 v3 beat the Core i5-6600 in every benchmark?

A: Yes. The Xeon wins all six head-to-head Cinebench tests (R15, R20, R23, each with multi-core and single-core variants) with a 17.7% advantage in each one. The i5-6600 has zero wins in the head-to-head dataset.

Q: Why does the Xeon have such a large multi-core advantage?

A: The Xeon has 8 threads versus the i5's 4 threads, thanks to Hyper-Threading on its 4 cores. This directly boosts multi-threaded Cinebench scores. Additionally, the Xeon has a higher base clock of 3.50 GHz versus 3.30 GHz for the i5.

Q: The i5-6600 has a much lower TDP. What does that mean in practice?

A: The i5's 35W TDP is less than half the Xeon's 80W TDP. This means the i5 generates less heat and requires less substantial cooling, making it suitable for compact or low-noise desktop builds. The Xeon will need a more capable cooler despite its older process node.

Q: Can I use DDR4 memory with the Xeon?

A: No. The Xeon E3-1241 v3 supports only DDR3 memory with a dual-channel bus and 25.6 GB/s bandwidth. The Core i5-6600 supports both DDR3 and DDR4, with a higher 34.1 GB/s bandwidth.

Q: Which CPU supports ECC memory?

A: Only the Xeon E3-1241 v3 supports ECC memory. The Core i5-6600 does not. This makes the Xeon suitable for workstations or servers where data integrity is critical, while the i5 is aimed at standard desktop use.

Q: Are the two CPUs compatible with the same motherboards?

A: No. The Xeon uses Intel Socket 1150, while the i5 uses Intel Socket 1151. They are physically incompatible and require different motherboards.

Specification Differences

The following fields differ between the two processors:

• Threads: Xeon has 8; i5 has 4.
• Base Clock: Xeon is 3.50 GHz; i5 is 3.30 GHz.
• TDP: Xeon is 80W; i5 is 35W.
• Socket: Xeon is Intel Socket 1150; i5 is Intel Socket 1151.
• Architecture: Xeon is Haswell; i5 is Skylake.
• Process Node: Xeon is 22 nm; i5 is 14 nm.
• Transistors: Xeon has 1,400 million; i5 has no listed value.
• Die Size: Xeon is 160 mm²; i5 is 177 mm².
• L3 Cache: Xeon has 8 MB shared; i5 has 6 MB shared.
• Memory Support: Xeon is DDR3 only; i5 is DDR3 and DDR4.
• Memory Bandwidth: Xeon is 25.6 GB/s; i5 is 34.1 GB/s.
• ECC Memory: Xeon supports it; i5 does not.
• Integrated Graphics: Xeon has none; i5 has UHD Graphics 530.
• Market Segment: Xeon is Server/Workstation; i5 is Desktop.
• Release Date: Xeon is 2014-05-10; i5 is 2015-06-30.
• Launch MSRP: Xeon is $273; i5 is $224.
• Part Number: Xeon is SR1R4; i5 is SR2BWSR2L5.

The Verdict

The data supports a clear split based on workload and platform requirements. For users who prioritize raw compute performance, particularly in multi-threaded applications, the Intel Xeon E3-1241 v3 is the definitive choice. It leads by 17.7% in every Cinebench test, offers double the thread count, and includes ECC memory support. Its higher 80W TDP is the trade-off for that performance, but for rendering, scientific computing, or any threaded workload, the benchmark results are unambiguous.

For users who prioritize efficiency and modern platform features, the Intel Core i5-6600 is the better fit. Its 35W TDP enables quieter and cooler systems, and its support for DDR4 memory provides a path to newer memory technology with 34.1 GB/s bandwidth. The integrated UHD Graphics 530 eliminates the need for a separate GPU in basic desktop use. The i5 is also based on the newer 14nm Skylake architecture, which is more power-efficient.

The choice is essentially between performance and efficiency. The Xeon wins every benchmark but consumes more power and uses older DDR3 memory. The i5 loses every benchmark but offers lower power draw, DDR4 support, and integrated graphics. The 41st percentile ranking for both CPUs confirms they are in the same overall performance class, but the Xeon's consistent 17.7% lead in Cinebench means it is the faster processor in every measured compute scenario. Users who can accommodate its power and cooling requirements should opt for the Xeon; those who need a low-power, feature-rich desktop platform should select the i5.