Intel Core i5-8365UE vs Intel Xeon E3-1226 v3 Comparison

The Intel Core i5-8365UE and Intel Xeon E3-1226 v3 are remarkably close in raw benchmark output despite representing two very different eras and market segments of Intel’s lineup. The i5-8365UE is a 15-watt mobile part built on a 14 nm process, while the Xeon E3-1226 v3 is an 84-watt server/workstation chip built on 22 nm. The benchmark data shows the mobile chip winning all six head-to-head Cinebench comparisons, but the margins are so narrow that the results effectively place them as peers in single-threaded and lightly-threaded workloads. This is a classic case where architectural efficiency and newer process technology offset a massive difference in power envelope and clock speed.

Head-to-Head Benchmarks

The head-to-head results are defined by extremely tight margins. In Cinebench R15 multi-core, the i5-8365UE scores 474 against the Xeon’s 472, a delta of just 0.4%. The single-core R15 test is a dead heat at 66 points for both chips, with a delta of 0%. Moving to Cinebench R20, the i5-8365UE again takes the multi-core test at 1978 versus 1970, another 0.4% margin. The R20 single-core result is 279 for the i5-8365UE and 278 for the Xeon, a 0.4% delta. In the newest Cinebench R23 test, the i5-8365UE scores 4710 multi-core and 665 single-core, while the Xeon E3-1226 v3 scores 4692 and 662 respectively. The multi-core delta is 0.4%, and the single-core delta widens slightly to 0.5%.

What makes these numbers striking is the context. The Xeon E3-1226 v3 runs at a 3.30 GHz base clock and 3.70 GHz boost clock, while the i5-8365UE has a 1.60 GHz base clock but boosts to 4.10 GHz. The Xeon has four physical cores and four threads, while the i5-8365UE has four cores and eight threads thanks to Hyper-Threading. The average benchmark scores tell the same story: the i5-8365UE averages 1362, and the Xeon averages 1357, a 0.4% difference that places the i5-8365UE ahead in the nearestRivals list. Both CPUs sit at the 36th percentile of all CPUs, confirming they are statistical twins in overall performance. The i5-8365UE wins all six head-to-head comparisons, but the largest victory is a 0.5% margin — a result that would be imperceptible in real-world use.

Architecture Differences

The two processors come from fundamentally different architectural generations. The Intel Core i5-8365UE is built on Whiskey Lake, specifically the Whiskey Lake-U codename, using a 14 nm process node. The Intel Xeon E3-1226 v3 is a Haswell part, codenamed Haswell-WS, manufactured on a 22 nm process. This process difference is significant: the 14 nm node allows the i5-8365UE to achieve higher boost clocks (4.10 GHz versus 3.70 GHz) while consuming dramatically less power (15 W TDP versus 84 W TDP).

The Xeon E3-1226 v3 has a larger L3 cache at 8 MB shared, compared to the i5-8365UE’s 6 MB shared. Both chips have identical L1 and L2 cache configurations at 64 KB per core and 256 KB per core respectively. The Xeon also has a documented transistor count of 1,400 million and a die size of 160 mm², while the i5-8365UE does not list these figures in the data. The memory architecture differs completely: the i5-8365UE supports DDR4 with dual-channel memory and a bandwidth of 38.4 GB/s, while the Xeon supports DDR3 with dual-channel memory and a bandwidth of 25.6 GB/s. This gives the mobile chip a 50% memory bandwidth advantage, which helps explain how it can match the Xeon despite a much lower base clock.

The integrated graphics also differ: the i5-8365UE features UHD Graphics 620, while the Xeon E3-1226 v3 has Intel HD P4600. Neither chip supports ECC memory in the i5-8365UE’s case, but the Xeon does support ECC memory, which is a key differentiator for server workloads. The sockets are entirely incompatible: the i5-8365UE uses Intel BGA 1528, while the Xeon uses Intel Socket 1150. Both support PCIe Gen 3 with 16 lanes from the CPU.

Where Each One Wins

The benchmark results show the i5-8365UE winning every single head-to-head comparison, but the margins are so small that the practical takeaway is more nuanced. The i5-8365UE wins in multi-core tests consistently, which is likely attributable to its eight threads versus the Xeon’s four. In Cinebench R23 multi-core, the i5-8365UE’s 4710 score versus 4692 for the Xeon represents a 0.4% advantage that comes directly from the extra threads allowing better utilization of the workload. However, the Xeon’s higher base clock of 3.30 GHz means it is not far behind in these multi-threaded tests despite having half the thread count.

The single-core tests are essentially a tie. The i5-8365UE wins R20 single-core by one point (279 versus 278) and R23 single-core by three points (665 versus 662). This is notable because the Xeon has a 3.70 GHz boost clock, while the i5-8365UE boosts to 4.10 GHz. The newer architecture and higher boost clock of the i5-8365UE allow it to overcome the Xeon’s clock advantage in single-threaded performance. The Xeon’s only real advantage in the data is its ECC memory support, which is absent on the i5-8365UE. For workloads that require error-correcting memory, the Xeon E3-1226 v3 is the only viable option between these two.

The i5-8365UE is clearly the better choice for mobile or low-power applications, given its 15 W TDP versus the Xeon’s 84 W TDP. The Xeon, on the other hand, is a server/workstation part that is now end-of-life, while the i5-8365UE remains active in production. For users with an existing Socket 1150 platform, the Xeon offers a drop-in upgrade path, but the i5-8365UE’s BGA 1528 socket means it is soldered to the motherboard and not upgradeable.

Specification Differences

The key specification differences between the two CPUs are substantial. The i5-8365UE has 4 cores and 8 threads, while the Xeon E3-1226 v3 has 4 cores and 4 threads. The base clock differs by 1.70 GHz: the i5-8365UE runs at 1.60 GHz, while the Xeon runs at 3.30 GHz. The boost clock is closer, with the i5-8365UE at 4.10 GHz and the Xeon at 3.70 GHz, a 0.40 GHz advantage for the mobile part. The TDP is the largest difference: 15 W for the i5-8365UE versus 84 W for the Xeon, a nearly 6x difference.

The process node is 14 nm for the i5-8365UE and 22 nm for the Xeon. The L3 cache is 6 MB shared on the i5-8365UE and 8 MB shared on the Xeon. Memory support is DDR4 for the i5-8365UE and DDR3 for the Xeon, with memory bandwidth of 38.4 GB/s versus 25.6 GB/s respectively. ECC memory support is false on the i5-8365UE and true on the Xeon. The integrated graphics are UHD Graphics 620 on the i5-8365UE and Intel HD P4600 on the Xeon.

The market segments are different: the i5-8365UE is a Mobile part, while the Xeon is a Server/Workstation part. The production status is Active for the i5-8365UE and End-of-life for the Xeon. The release dates are also far apart: the i5-8365UE was released on 2019-04-15, while the Xeon was released on 2014-05-10. The launch MSRP for the i5-8365UE is $297, and the launch MSRP for the Xeon is $213. The part numbers are SRFDU for the i5-8365UE and SR1R0 for the Xeon. Both CPUs have locked multipliers, and both use PCIe Gen 3 with 16 lanes from the CPU.

FAQ

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

A: The Intel Core i5-8365UE scores 4710 in Cinebench R23 multi-core, while the Intel Xeon E3-1226 v3 scores 4692. This gives the i5-8365UE a 0.4% advantage, which is the largest multi-core margin in the head-to-head tests.

Q: Do the two CPUs have the same single-core performance?

A: The single-core scores are nearly identical. In Cinebench R15 both score 66, in R20 the i5-8365UE scores 279 versus 278 for the Xeon, and in R23 the i5-8365UE scores 665 versus 662. The i5-8365UE wins all three, but the margins are 0% to 0.5%.

Q: What is the TDP difference between these two processors?

A: The Intel Core i5-8365UE has a TDP of 15 watts, while the Intel Xeon E3-1226 v3 has a TDP of 84 watts. This makes the i5-8365UE dramatically more power-efficient, which is expected given its mobile market segment.

Q: Does the Xeon E3-1226 v3 support ECC memory?

A: Yes, the Intel Xeon E3-1226 v3 supports ECC memory. The Intel Core i5-8365UE does not support ECC memory, which is a critical distinction for server or workstation reliability requirements.

Q: Which processor has a higher boost clock?

A: The Intel Core i5-8365UE has a boost clock of 4.10 GHz, which is higher than the Intel Xeon E3-1226 v3’s boost clock of 3.70 GHz. However, the Xeon has a much higher base clock at 3.30 GHz compared to 1.60 GHz for the i5-8365UE.

Q: How do these CPUs compare in terms of overall average benchmark score?

A: The Intel Core i5-8365UE has an average benchmark score of 1362, while the Intel Xeon E3-1226 v3 has an average score of 1357. This places the i5-8365UE ahead by 0.4%, and both CPUs sit at the 36th percentile of all CPUs.