Intel Core i5-1145GRE vs Intel Xeon E3-1280 v5 Comparison

# Head-to-Head Benchmarks

The benchmark data is unambiguous: the Intel Xeon E3-1280 v5 wins all six head-to-head Cinebench comparisons against the Intel Core i5-1145GRE, though the margins are razor-thin. The largest single difference appears in Cinebench R15 multi-core, where the Xeon scores 707 against the Core i5's 705, a 0.3% lead. Every other multi-core test shows a 0.2% advantage for the Xeon — Cinebench R20 multi-core comes in at 2946 versus 2940, and Cinebench R23 multi-core at 7015 versus 7001. Single-core results are even closer: both processors tie at 99 in Cinebench R15 single-core, while the Xeon edges ahead by one point in both R20 (415 vs. 414) and R23 (990 vs. 988), each a 0.2% delta.

What these numbers reveal is a near-total performance parity between a 2015 server-class part and a 2020 mobile processor. The average benchmark scores tell the same story: the Xeon E3-1280 v5 averages 2029 across all tests, while the Core i5-1145GRE averages 2025. That four-point gap places both chips at the 45th percentile of all CPUs in the database, and their nearest-rival lists are almost mirror images. The Xeon's closest competitor is the Xeon E3-1260L v5 at an identical 2029 average score, followed by a 0.1% gap to the Core i5-1130G7. The Core i5-1145GRE's nearest rival is that same Core i5-1130G7 at 2026, with the Xeon E3-1280 v5 itself sitting 0.2% ahead.

The practical interpretation is that generation advantage and process node shrink do not translate into Cinebench wins here. The Core i5-1145GRE's newer architecture closes the gap but does not overcome the Xeon's higher sustained power envelope. In workloads that scale across cores, the Xeon holds a consistent, if small, edge; in single-threaded tasks, the two are effectively indistinguishable. The data does not support a narrative of mobile efficiency triumphing over older desktop-class silicon — it supports one of stalemate.

# Architecture Differences

The architectural chasm between these two processors is vast, even as their benchmark scores converge. The Xeon E3-1280 v5 is built on Intel's 14 nm process with 1,750 million transistors on a 122 mm² die, using the Skylake-DT architecture from the Skylake generation. It was released on 2015-10-18 and is now end-of-life. The Core i5-1145GRE, by contrast, uses the 10 nm Tiger Lake-U architecture with Willow Cove cores, packs a 144 mm² die, and launched on 2020-09-01 as an active product.

Both chips feature 4 cores and 8 threads, and both share 8 MB of shared L3 cache. The differences emerge in the lower cache levels. The Xeon allocates 64 KB of L1 cache per core and 256 KB of L2 per core. The Core i5-1145GRE gives each core 80 KB of L1 — a 25% increase per core — and a substantially larger 1.25 MB of L2 per core, nearly five times the Xeon's allocation. That larger private cache likely explains why the Core i5 can match the Xeon despite a dramatically lower power budget.

Memory support diverges as well. The Xeon supports DDR4 only, while the Core i5-1145GRE supports both DDR4 and LPDDR4X. Both use dual-channel memory buses, and both support ECC memory. PCIe connectivity differs sharply: the Xeon provides Gen 3 with 16 lanes from the CPU, whereas the Core i5 offers Gen 4 with only 4 CPU lanes. The Core i5 also integrates Iris Xe Graphics G7 with 80 execution units; the Xeon has no integrated graphics.

The process node and transistor count differences are stark — 14 nm versus 10 nm, and 1,750 million transistors versus no disclosed figure for the Tiger Lake part. Yet the die size is larger on the newer chip (144 mm² vs. 122 mm²), a reminder that integrated graphics and bigger caches consume silicon area. The power envelopes reflect their market segments: the Xeon carries an 80 W TDP and targets server/workstation use on Intel Socket 1151, while the Core i5 sips 28 W and is a mobile part on Intel BGA 1449.

# FAQ

Q: Which processor is faster in multi-core workloads?

A: The Xeon E3-1280 v5 wins every multi-core Cinebench test, but by tiny margins: 0.3% in R15 (707 vs. 705), 0.2% in R20 (2946 vs. 2940), and 0.2% in R23 (7015 vs. 7001).

Q: Is the Core i5-1145GRE competitive despite its much lower 28 W TDP?

A: Yes. Despite the Xeon's 80 W TDP versus 28 W for the Core i5, average benchmark scores are nearly identical — 2029 for the Xeon and 2025 for the Core i5, a 0.2% difference.

Q: Do both processors support ECC memory?

A: Yes, both the Xeon E3-1280 v5 and the Core i5-1145GRE support ECC memory, a feature that matters for workstation and server reliability.

Q: How do their memory types differ?

A: The Xeon supports only DDR4, while the Core i5-1145GRE supports both DDR4 and LPDDR4X. Both use dual-channel memory buses.

Q: Which chip has the larger L2 cache?

A: The Core i5-1145GRE has 1.25 MB of L2 per core, compared to 256 KB per core on the Xeon E3-1280 v5 — roughly a five-fold advantage per core.

Q: Are these processors in the same performance percentile?

A: Yes, both sit at the 45th percentile of all CPUs in the database, and their average benchmark scores differ by just four points (2029 vs. 2025).

# Specification Differences

• Base clock: 3.70 GHz (Xeon) vs. 1500.00 MHz (Core i5)
• Boost clock: 4.00 GHz (Xeon) vs. 4.10 GHz (Core i5)
• TDP: 80 W (Xeon) vs. 28 W (Core i5)
• Socket: Intel Socket 1151 (Xeon) vs. Intel BGA 1449 (Core i5)
• Architecture: Skylake (Xeon) vs. Tiger Lake (Core i5)
• Process node: 14 nm (Xeon) vs. 10 nm (Core i5)
• Transistors: 1,750 million (Xeon) vs. not disclosed (Core i5)
• Die size: 122 mm² (Xeon) vs. 144 mm² (Core i5)
• L1 cache: 64 KB per core (Xeon) vs. 80 KB per core (Core i5)
• L2 cache: 256 KB per core (Xeon) vs. 1.25 MB per core (Core i5)
• Memory support: DDR4 (Xeon) vs. DDR4 and LPDDR4X (Core i5)
• PCIe: Gen 3, 16 lanes (Xeon) vs. Gen 4, 4 lanes (Core i5)
• Integrated graphics: None (Xeon) vs. Iris Xe Graphics G7 80EU (Core i5)
• Market segment: Server/Workstation (Xeon) vs. Mobile (Core i5)
• Production status: End-of-life (Xeon) vs. Active (Core i5)
• Release date: 2015-10-18 (Xeon) vs. 2020-09-01 (Core i5)
• Launch MSRP: $612 (Xeon) vs. $362 (Core i5)

# The Verdict

The data presents a clear but nuanced verdict: the Xeon E3-1280 v5 is the technically faster processor, but the Core i5-1145GRE is the more logical purchase for most scenarios. The Xeon wins all six head-to-head benchmarks, yet the largest margin is 0.3%, and the average score difference is four points out of roughly 2,029. That is not a performance gap — it is a rounding error in real-world terms.

What separates these chips is not speed but context. The Xeon E3-1280 v5 is an end-of-life server/workstation part with an 80 W TDP, a $612 launch MSRP, and no integrated graphics, requiring a discrete GPU for any display output. The Core i5-1145GRE is an active mobile processor with a 28 W TDP, a $362 launch MSRP, and integrated Iris Xe Graphics G7 with 80 execution units, plus PCIe Gen 4 connectivity and support for LPDDR4X memory.

For a system builder prioritizing raw multi-core throughput in a server chassis with existing discrete graphics, the Xeon's six benchmark wins make it the nominal choice. For anyone building a compact, power-conscious system — or a laptop — the Core i5-1145GRE delivers essentially identical Cinebench performance at less than half the power draw and with a lower launch MSRP. The Xeon's only genuine advantages are its 16 PCIe Gen 3 lanes versus 4 Gen 4 lanes, and its 80 W TDP headroom for sustained all-core loads. The Core i5 counters with a larger L2 cache per core, a newer process node, and integrated graphics.

# Where Each One Wins

The Xeon E3-1280 v5 wins in: All six head-to-head Cinebench tests (R15 multi-core 707 vs. 705, R15 single-core 99 vs. 99, R20 multi-core 2946 vs. 2940, R20 single-core 415 vs. 414, R23 multi-core 7015 vs. 7001, R23 single-core 990 vs. 988). It also offers 16 PCIe Gen 3 lanes from the CPU versus 4 Gen 4 lanes, and a higher base clock of 3.70 GHz versus 1500.00 MHz. For server/workstation deployments where a discrete GPU is already present and sustained all-core load is the norm, the Xeon's 80 W TDP provides headroom for consistent performance.

The Core i5-1145GRE wins in: Power efficiency and platform flexibility. Its 28 W TDP is 65% lower than the Xeon's 80 W, making it suitable for mobile and compact designs. It integrates Iris Xe Graphics G7 with 80 execution units, eliminating the need for a separate GPU. It supports both DDR4 and LPDDR4X memory, and its 1.25 MB L2 cache per core dwarfs the Xeon's 256 KB. It uses PCIe Gen 4, offering double the per-lane bandwidth of the Xeon's Gen 3, and its 4.10 GHz boost clock exceeds the Xeon's 4.00 GHz. It is an active product with a $362 launch MSRP versus the Xeon's $612, and it reaches the same 45th percentile in the database while averaging only four points lower. For mobile workloads, embedded systems, or any build where power draw, integrated graphics, and modern memory options matter more than a 0.2% Cinebench delta, the Core i5-1145GRE is the data-backed choice.