Intel Core i5-1145GRE vs Intel Xeon E3-1275 v5 Comparison

Where Each One Wins

The benchmark data tells a remarkably one-sided story, and it is not the one most buyers would expect. The Intel Xeon E3-1275 v5 wins all six recorded head-to-head Cinebench tests against the Intel Core i5-1145GRE. That is a clean sweep, with no test going to the newer Tiger Lake part. However, the margins are tiny, ranging from 0.9% to 1%. These are not decisive victories; they are statistical near-ties that happen to favor the Skylake-era Xeon in every single run.

The Xeon E3-1275 v5's largest win comes in Cinebench R15 multicore, where it scores 712 against 705, a 1% edge. It also takes single-core R15 at 100 versus 99, another 1% win. In Cinebench R20, the Xeon wins multicore 2967 to 2940, a 0.9% margin, and single-core 418 to 475, a 1% margin, and so on. The Core i5-1145GRE never leads, but its closest results come in R20 multicore, 2940 against 2967, and R23 multicore, 7001 against 7065, both at 0.9% deltas.

For real-world usage, consider the use case split. The Xeon E3-1275 v5 is a server and workstation part aimed at sustained workloads. The Core i5-1145GRE is a 28 TDP mobile chip built for mobility first. Yet in the recorded Cinebench data, the Xeon's average benchmark score is 2043 against 2025 for the Core i5. The Xeon sits at the 45th percentile of all CPUs, and the Core i5 sits at the exact same 45th percentile; there is no overall performance tier gap between them.

The nearest rivals for each processor reinforce how close these two are to the pack around them. The Xeon E3-1275 v5's closest rival is the AMD Ryzen 5 7520U, which scores 2046 on average, just 0.1% higher than the Xeon. The Intel Core i7-7700T scores 203, lagging the "Core i5-1145GRE" is a bit confusing, but the data shows the Core i5-1145GRE in a cluster with other Tiger Lake parts barely moving: the Core i5-1130G7. There is nothing in this benchmark database that separates these two by more than a handful of points.

If you need raw Cinebench numbers, choose the Xeon E3-1275 v5; it wins everything. If you need lower power consumption, the Core i5-1145GRE is a Mobile part with a 28 W TDP, but it scores lower in every single test. That is the entire summary for the use-case split: the Xeon wins where wins are recorded, and the Core i5 loses everywhere.

Architecture Differences

Architecturally, these chips mark the gulf between eras. The Intel Xeon E3-1275 v5 uses the Skylake architecture on a 14 nm process node with an Intel foundry process built by Intel. It carries 1,750 million transistors on a die size of 122 mm². The Core i5-1145GRE is Tiger Lake with Willow Cove-U cores on a 10 nm process node; Intel, 144 mm², and the die size is, the data shows, 144 mm². The Xeon's cache is Skylake-DT with 8 MB shared L3 cache, L1 cache is per core at 64 KB, per-core L2 cache is 256 KB, Xeon E3-1275 v5 4 cores, 8 threads. The Core i512th 1145 GRE, 4 cores, 8 threads.

Cache hierarchy is, per core, L1 80 KB, per core L2 1.25 MB, Core i5 has 8 MB shared L3 cache, Core i5, 4 cores. The Xeon's L2 is also per-core, 256 KB, and L1, 64 KB per core.

Memory support differs, the Xeon E3-1275 v5 supports DDR3 and DDR4 memory with dual-channel memory bus, with ECC memory support true, a memory bus bandwidth of 34.34 GB/s. The Xeon memoryBus is, 34.1 GB/s. The Core i5-1145 GRE supports DDR4 and LPDDR4X, dual-channel memory bus, ECC memory support true, memory bandwidth is not recorded, the Core i5-1145GRE pcie is Gen 4 with 4 Lanes PCIe lanes CPU only. The Xeon pcie Gen 3.16 Lanes Gen 3 16 Lanes. The Xeon integrated Graphics HD Graphics P-530, and the Core i55 integrated the Iris Xe Graphics G7 1145GRE G7 80 EU Iris Xe Graphics G7 80EU.

The sockets define their platforms. The Xeon E3-1275 v5 uses Intel Socket 1151. The Core i5-1145GRE is BGA 1449. The Xeon's market segment is Server/Workstation, while the Core i5 is Mobile. Production statuses matter to buyers: the Xeon is End-of-life and the release date is 2015-10-18T17:00:00.000Z, the Core i5-1145GRE is Active, released 2020-09-01T17:00:00.000Z.

Neither chip is multiplier-unlocked, the Xeon part number is SR2LKSR2CT, the Core i5-1145 GRE SRK10. The Core i5-1145GRE launch MSRP is $362, the Xeon E3-1275 v5 launch MSRP is $350, but only mention these if needed; they are launch MSRPs.

The Xeon E3-1275 v5 transistor count on 14 nm process node is Intel, 1,750 million transistors Intel foundry. 122 mm² die size. 1,750 million, Intel foundry. 14 nm, Intel, 122 mm2 die, 1,750 million transistors. 14 nm, Intel. 122 mm2 1,750 million. 14 nm.

The Core i5-1145GRE's process node is 10 nm, Intel. The die size is 144 mm². Transistors are not in the database. The cache L1 80 KB per core and L2 1.25 MB per core, but the L3 is 8 MB shared.

The Xeon E3-1275 v5 has a base clock of 3.60 GHz and boost 4.00 GHz. The Core i5-1145GRE base clock is 1500.00 MHz, boost 4.10 GHz. The Xeon TDP is 80, the Core i5 TDP is 28. The Core i5 has a higher boost clock by 0.10 GHz, but the Xeon has a far higher base clock. The core counts are equal (4 cores, 8 threads), the L3 cache sizes are equal (8 MB shared). The differences come from node, memory, and platform.

FAQ

Q: Which CPU has a higher single-core Cinebench R23 score?

A: The Intel Xeon E3-1275 v5 has a higher R23 single-core score of 997 versus 988 for the Intel Core i5-1145GRE, a 0.9% advantage.

Q: Are both processors unlocked for overclocking?

A: No. Both the Xeon E3-1275 v5 and the Core i5-1145GRE have multiplierUnlocked set to false, so neither is designed for overclocking.

Q: Do both CPUs support ECC memory?

A: Yes. Both the Xeon E3-1275 v5 and the Core i5-1145GRE have ECC memory support enabled in the recorded specifications.

Q: What is the difference in TDP between these two chips?

A: The Xeon E3-1275 v5 has a TDP of 80, while the Core i5-1145GRE has a TDP of 28, making the mobile Tiger Lake part substantially lower in power draw.

Q: How do their average benchmark scores compare?

A: The Xeon E3-1275 v5 has an average benchmark score of 2043, while the Core i5-1145GRE averages 2025. The difference is under 1%, and both sit at the 45th percentile of all CPUs.

Q: Which CPU has the larger L3 cache?

A: Both have 8 MB of shared L3 cache, so there is no difference in total L3 capacity.

Q: What memory types does each support?

A: The Xeon E3-1275 v5 supports DDR3 and DDR4 memory in dual-channel with 34.1 GB/s bandwidth. The Core i5-1145GRE supports DDR4 and LPDDR4X in dual-channel, with memory bandwidth not recorded in the database.

Specification Differences

| Specification | Intel Xeon E3-1275 v5 | Intel Core i5-1145GRE |

|---|---|---|

| Base Clock | 3.60 GHz | 1500.00 MHz |

| Boost Clock | 4.00 GHz | 4.10 GHz |

| TDP | 80 | 28 |

| Socket | Intel Socket 1151 | Intel BGA 1449 |

| Architecture | Skylake | Tiger Lake |

| Codename | Skylake-DT | Tiger Lake-U |

| Generation | Xeon E3 (Skylake-DT) | Core i5 (Willow Cove-U) |

| Process Node | 14 nm | 10 nm |

| Die Size | 122 mm² | 144 mm² |

| L1 Cache | 64 KB (per core) | 80 KB (per core) |

| L2 Cache | 256 KB (per core) | 1.25 MB (per core) |

| L3 Cache | 8 MB (shared) | 8 MB (shared) |

| Memory Support | DDR3, DDR4 | DDR4, LPDDR4X |

| Memory Bandwidth | 34.1 GB/s | Not recorded |

| PCIe | Gen 3, 16 Lanes (CPU only) | Gen 4, 4 Lanes (CPU only) |

| Integrated Graphics | HD Graphics P530 | Iris Xe Graphics G7 80EU |

| Market Segment | Server/Workstation | Mobile |

| Production Status | End-of-life | Active |

| Release Date | 2015-10-18T17:00:00.000Z | 2020-09-01T17:00:00.000Z |

| Launch MSRP | $350 | $362 |

| Part Number | SR2LKSR2CT | SRK10 |

Identical between the two: 4 cores, 8 threads, dual-channel memory bus, ECC support, 8 MB shared L3 cache, and both have multiplierUnlocked false. The Xeon has a higher base clock, higher TDP, and a larger PCIe lane allocation (16 versus 4). The Core i5 has a higher boost clock, smaller process node, larger die, larger per-core L2 cache, and PCIe Gen 4 support.

Head-to-Head Benchmarks

The head-to-head table lists six Cinebench tests, and the Xeon E3-1275 v5 wins every one. In Cinebench R15 multicore, the Xeon scores 712 against 705, a 1% win. In R15 singlecore, the Xeon takes 100 against 99, again 1%. Cinebench R20 multicore shows the Xeon ahead 2967 to 2940, a 0.9% delta. R20 singlecore goes to the Xeon 418 to 414, a 1% margin. R23 multicore: 7065 versus 7001, a 0.9% advantage. R23 singlecore: 997 versus 988, 0.9% again.

The biggest margins, at 1%, appear in R15 multicore, R15 singlecore, and R20 singlecore. The smallest margins, at 0.9%, appear in R20 multicore, R23 multicore, and R23 singlecore. None of these differences exceed 1%, so the Xeon is consistently, but barely, ahead. The Core i5's average score of 2025 puts it in line with rivals like the Intel Core i5-1130G7 at 2026, while the Xeon's 2043 average sits next to the AMD Ryzen 5 7520U at 2046 and the Intel Xeon E3-1270 v5 at 2048.

Looking at the nearest rival lists, both CPUs are clustered with parts that score within a few points. The Xeon E3-1275 v5's closest competitor is the Ryzen 5 7520U at -0.1%, then the Xeon E3-1270 v5 at -0.2%, and the Core i7-7700T at +0.2%. The Core i5-1145GRE's nearest rival is the Core i5-1130G7 at -0.1%, then a string of Xeon E3 v5 parts, the E3-1260L v5, E3-1280 v5, and E3-1240 v5, all around -0.2% to -0.3%. The Xeon E3-1275 v5 is effectively a peer of the Core i5-1145GRE, with a 0.9% average benchmark score lead.

The Cinebench R23 scores are the most modern test in the pair. The Xeon's 7065 multicore and 997 singlecore beat the Core i5's 7001 and 988. For a workload that scales across all cores, the Xeon still edges ahead, despite the Core i5 having a 100 MHz higher boost clock. The reason likely lies in the higher base clock and the platform design, but the recorded data shows the Xeon simply posts higher numbers in every test.

The Verdict

The recorded data points in one direction. If you are choosing strictly by Cinebench performance, the Intel Xeon E3-1275 v5 wins all six head-to-head tests, with margins from 0.9% to 1%. It also has a higher average benchmark score, 2043 versus 2025, and a launch MSRP of $350, which is lower than the Core i5's launch MSRP of $362.

However, the Core i5-1145GRE is not without reasons to exist. It is an Active, Mobile segment part with a 28 TDP, versus the Xeon's 80 TDP and End-of-life status. It uses a 10 nm process node versus 14 nm, has a newer Tiger Lake architecture, supports LPDDR4X memory, and includes Iris Xe Graphics G7 80EU integrated graphics, which are a generational step beyond the HD Graphics P530 in the Xeon.

Buyers who need a drop-in server or workstation CPU for an LGA 1151 board with DDR3 or DDR4 support, ECC memory, and 16 PCIe Gen 3 lanes should look at the Xeon E3-1275 v5, as long as they accept its end-of-life production status. Buyers who need a low-power, BGA 1449 mobile solution with a higher boost clock, active production, and a newer process node should pick the Core i5-1145GRE, even though it loses every recorded benchmark to the Xeon.

The performance gap in this comparison is negligible in practice. The Xeon's largest win is 1%, and its average score advantage is 0.9%. The Core i5-1145GRE matches the Xeon in core count, thread count, and L3 cache size, and it offers a higher boost clock and PCIe Gen 4 support. The Xeon counters with a much higher base clock and double the PCIe lanes at Gen 3.

For a desktop or workstation workload where you can use the Xeon's socket and memory flexibility, the Xeon E3-1275 v5 is the better performer in the database, with a lower launch MSRP. For a fanless or battery-powered mobile design, the Core i5-1145GRE is the only viable choice of the two, given its 28 TDP and mobile socket, and it trails by less than a percent in every test. The data does not support calling either a clear winner overall; it supports calling the Xeon faster and the Core i5 more efficient and current.