Intel Core i3-1125G4 vs Intel Xeon E5-2643 v3 Comparison

The Intel Xeon E5-2643 v3 and the Intel Core i3-1125G4 are two processors that, on paper, should not be comparable at all. One is a 135-watt server and workstation chip from the Haswell-EP generation, built on a 22 nm process and designed for socket 2011-3 platforms. The other is a 15-watt mobile processor from the Tiger Lake-U family, fabricated on a 10 nm process and soldered into laptops via the BGA 1449 package. Yet the recorded benchmark data tells a curious story: despite a seven-year gap in release dates and radically different design targets, the two land within striking distance of each other in the database rankings, separated by only 60 points in average benchmark score. The Xeon averages 2511 and sits in the 49th percentile against all CPUs; the Core i3 averages 2451 and sits in the 48th percentile. That near-identical standing is exactly what makes this pairing worth investigating, because the per-test results reveal a much more one-sided contest than the aggregate numbers suggest.

Head-to-Head Benchmarks

Every direct comparison in the database was won by the Xeon E5-2643 v3, and by a remarkably consistent margin. In Cinebench R15 multi-core, the Xeon scored 875 against the Core i3's 792, a lead of 10.5 percent. Cinebench R15 single-core went the same way: 123 versus 111, again 10.8 percent in the Xeon's favor. The pattern holds across every Cinebench generation in the dataset. In R20 multi-core the scores were 3646 against 3301, and in R20 single-core 514 against 465, both exactly a 10.5 percent gap. Cinebench R23 repeats the story: 8682 against 7860 in multi-core and 1225 against 1109 in single-core, a 10.5 percent Xeon advantage each time.

That consistency is the most interesting finding here. Normally, a many-core server chip beating a thin-and-light mobile chip would be expected to widen its lead in multi-threaded tests while losing ground in single-threaded workloads, where newer architectures typically shine with superior instructions-per-clock. The data shows no such crossover. The Core i3-1125G4 trails by roughly the same tenth-of-a-gap whether the workload is serialized across one thread or spread across all of them. Its Willow Cove cores, running at a 3.70 boost clock that matches the Xeon's boost exactly, do not convert their architectural youth into a single-thread victory in any Cinebench test recorded.

The database also holds Geekbench results for the Core i3 that have no Xeon counterpart: 4509 in multi-core and 1461 in single-core. Those numbers cannot be compared head-to-head here, but they confirm the chip's positioning as a mid-pack mobile performer. Against its own nearest rivals, the Core i3 sits essentially dead level: the Intel Core i5-8600 averages 2454 against its 2451, the Intel Xeon D-1541 averages 2447, and the Intel Core i5-10500 averages 2446. The Xeon E5-2643 v3's rival list is similarly tight, with the Intel Xeon E-2144G at 2514, the Intel Xeon E5-2630 v3 at 2507, the Intel Core i5-1155G7 at 2496, and the Intel Xeon E-2244G at 2527. In other words, both processors anchor dense clusters of near-equal performers, yet the Xeon wins every shared test between them.

FAQ

Q: Which CPU is faster in the recorded benchmarks?

A: The Xeon E5-2643 v3 won all six head-to-head tests, with leads of 10.5 percent in five of them and 10.8 percent in Cinebench R15 single-core.

Q: Does the newer Core i3 win any single-core test?

A: No. Its best single-core results were 111 in R15, 465 in R20, and 1109 in R23, versus the Xeon's 123, 514, and 1225. Despite a 2021 release date and a 10 nm process, it trails in every single-threaded measurement in the database.

Q: How do the two compare in overall database standing?

A: They are nearly tied. The Xeon averages 2511 and ranks in the 49th percentile of all CPUs; the Core i3 averages 2451 and ranks in the 48th percentile.

Q: Which chip supports error-correcting memory?

A: Only the Xeon. It supports DDR4 on a quad-channel bus with 68.3 GB/s of memory bandwidth and ECC support. The Core i3 supports DDR4 and LPDDR4X on a dual-channel bus with no ECC.

Q: Do either of these chips have integrated graphics?

A: The Xeon has none listed. The Core i3 includes Iris Xe-LP Graphics G4, which matters for any build without a discrete GPU.

Q: Are either of these chips multiplier unlocked?

A: Neither. Both are locked, so performance headroom beyond stock behavior is limited.

Architecture Differences

The architectural gulf between these two processors is wide. The Xeon E5-2643 v3 is a Haswell-EP design with 6 cores and 12 threads, fabricated by Intel on a 22 nm process. It packs 2,600 million transistors into a 356 mm² die, reflecting its origins as a big server silicon. Its cache hierarchy is built for capacity: 64 KB of L1 per core, 256 KB of L2 per core, and a large 20 MB shared L3. Memory support is DDR4 only, but on a quad-channel bus delivering 68.3 GB/s of bandwidth, with ECC enabled for data integrity in server and workstation environments. PCIe connectivity is generous at Gen 3 with 40 CPU lanes.

The Core i3-1125G4 inverts nearly every one of those design choices. It is a Tiger Lake-U part built on Intel's 10 nm process, with 4 cores and 8 threads on a much smaller 144 mm² die. Where the Xeon emphasizes raw cache capacity, the Core i3 uses a deeper per-core cache structure: 80 KB of L1 per core and 1.25 MB of L2 per core, but only 8 MB of shared L3, less than half the Xeon's. Its memory controller supports both DDR4 and LPDDR4X on a dual-channel bus, with no ECC. PCIe is newer but narrower: Gen 4 with 16 CPU lanes, versus the Xeon's older but far wider Gen 3 with 40 lanes. Both chips boost to the same 3.70 figure at the top end, but their base clocks are recorded differently: the Xeon lists 3.40 while the Core i3 lists 2000.00, a database unit quirk that reflects its low mobile baseline.

The market segmentation explains the divergence. The Xeon belongs to the Server/Workstation segment and launched with a $1552 MSRP; the Core i3 belongs to the Mobile segment with a $281 launch MSRP. Both are now end-of-life parts, and both carry locked multipliers.

The Verdict

Strictly on the benchmark evidence, the Xeon E5-2643 v3 is the faster processor, full stop. Six wins from six tests, all by margins of 10.5 to 10.8 percent, leave no ambiguity about raw Cinebench performance. The data also suggests the Xeon's 6 cores and 12 threads, backed by 20 MB of L3 and 68.3 GB/s of quad-channel bandwidth, give it the edge in sustained multi-threaded rendering.

But the aggregate database picture complicates a simple verdict. The two chips occupy effectively the same percentile band, 49 versus 48, because the Core i3 competes in a different ecosystem entirely: a 15-watt mobile envelope with integrated Iris Xe-LP Graphics G4, LPDDR4X support, and PCIe Gen 4. For a laptop-class workload where the Xeon simply cannot exist, the Core i3 is the only option of the two. For a workstation or server role requiring ECC memory, wide PCIe lane counts, or maximum rendering throughput, the Xeon's sweep of every shared benchmark makes it the clear pick from this dataset.

Specification Differences

The differing fields, side by side:

• Cores/Threads: Xeon 6/12, Core i3 4/8
• Base clock: Xeon 3.40, Core i3 2000.00 (as recorded)
• Boost clock: both 3.70
• TDP: Xeon 135 W, Core i3 15 W
• Socket: Xeon Socket 2011-3, Core i3 BGA 1449
• Architecture: Haswell (Haswell-EP) versus Tiger Lake (Tiger Lake-U, Willow Cove-U cores)
• Process node: 22 nm versus 10 nm
• Die size: 356 mm² versus 144 mm²
• L1/L2 cache: Xeon 64 KB and 256 KB per core, Core i3 80 KB and 1.25 MB per core
• L3 cache: Xeon 20 MB shared, Core i3 8 MB shared
• Memory: Xeon DDR4 quad-channel at 68.3 GB/s with ECC; Core i3 DDR4/LPDDR4X dual-channel, no ECC
• PCIe: Xeon Gen 3 with 40 lanes, Core i3 Gen 4 with 16 lanes
• Graphics: Xeon none listed, Core i3 Iris Xe-LP Graphics G4
• Segment and status: Server/Workstation versus Mobile; both end-of-life
• Release: Xeon 2014-09-07, Core i3 2021-03-30
• Launch MSRP: Xeon $1552, Core i3 $281

Where Each One Wins

The Xeon's territory is defined entirely by its benchmark sweep. It wins Cinebench R15, R20, and R23 in both multi-core and single-core configurations, meaning it takes rendering, simulation, and any thread-count-sensitive workload measured in this database. Its 20 MB L3, quad-channel memory, 40 PCIe lanes, and ECC support point it at workstation and server duty where throughput and reliability dominate.

The Core i3's wins are structural rather than score-based. It is the only one of the two that fits a mobile platform, the only one with integrated graphics in the form of Iris Xe-LP Graphics G4, the only one supporting LPDDR4X for power-efficient memory, and the only one offering PCIe Gen 4 connectivity. Its nearest-rival cluster, including the Core i5-8600 and Core i5-10500, confirms it holds its own against desktop parts far outside its power class. For a portable system, that is a victory the Xeon cannot contest, no matter how many benchmarks it takes.