AMD EPYC 7643 vs Intel Core i5-1345U Comparison

The Intel Core i5-1345U and the AMD EPYC 7643 occupy opposite ends of the CPU landscape, a thin 15W mobile chip against a 48-core server processor, yet the recorded database places both in the 73rd percentile of all measured CPUs, with average benchmark scores of 19411 and 18697 respectively. That shared percentile is where the similarity ends. In every head-to-head benchmark available, the EPYC 7643 wins by margins ranging from roughly 74% to over 88%, and the Core i5-1345U records zero head-to-head victories. The data below explains why these two parts sit in the same percentile while serving entirely different purposes.

FAQ

Q: Which CPU wins the shared benchmarks in the database?

A: The AMD EPYC 7643 wins all six head-to-head tests. Its largest margin is in Cinebench R23 multi-core, where it scores 64642 against 7724, a gap of 88.1%. Its smallest margin is in Cinebench R15 single-core, where it leads 919 to 240, a 73.9% difference.

Q: How do their average benchmark scores compare?

A: The Core i5-1345U averages 19411 across its recorded benchmark set, while the EPYC 7643 averages 18697. The Intel chip's higher average is driven by its broader suite of PassMark results, which include tests the EPYC does not have recorded in the database.

Q: Do these two CPUs belong to the same market?

A: No. The Core i5-1345U is a mobile part with a 15W TDP, an Intel BGA 1744 socket, and integrated Iris Xe Graphics 80EU. The EPYC 7643 is a server and workstation processor with a 225W TDP, an AMD Socket SP3 interface, and no integrated graphics.

Q: Which chip has more cores and cache?

A: The EPYC 7643 has 48 cores and 96 threads with 256 MB of shared L3 cache. The Core i5-1345U has 10 cores, 12 threads, and 12 MB of shared L3 cache.

Q: What was each processor's launch MSRP?

A: The Core i5-1345U carried a launch MSRP of $309, while the EPYC 7643 carried a launch MSRP of $4995.

Q: Do both CPUs support ECC memory?

A: No. The EPYC 7643 supports ECC memory across an eight-channel DDR4 bus with 204.8 GB/s of bandwidth. The Core i5-1345U does not support ECC and uses a dual-channel bus supporting both DDR4 and DDR5.

Architecture Differences

These two processors could hardly be more architecturally distinct. The Core i5-1345U is built on Intel's Raptor Lake-U design, codenamed Raptor Lake, manufactured on a 10 nm process at Intel's own foundry. The EPYC 7643 uses AMD's Zen 3 architecture under the Milan codename, part of the EPYC 7003 series, produced on TSMC's 7 nm node. The AMD chip's scale is substantial: 33,200 million transistors spread across a multi-chip design of 8x 81 mm² dies.

The core topology reflects intent. Intel's hybrid-capable mobile design packs 10 cores and 12 threads into a 15W envelope, prioritizing efficiency for thin notebooks. AMD's server silicon scales out to 48 cores and 96 threads under a 225W TDP, built for sustained parallel throughput rather than power frugality.

Cache design differs just as sharply. Each EPYC core carries 64 KB of L1 and 512 KB of L2, backed by an enormous 256 MB of shared L3 that keeps 48 cores fed. The Core i5-1345U gives each core 80 KB of L1 and 1.25 MB of L2, with a much smaller 12 MB shared L3 pool. The Intel part actually has more per-core L2, reflecting its consumer workload focus, but the EPYC's aggregate cache dwarfs it.

Platform features diverge along the same lines. The EPYC offers 128 Gen 4 PCIe lanes for accelerators, storage, and networking, plus ECC memory support on an eight-channel DDR4 bus rated at 204.8 GB/s. The Core i5-1345U provides 8 Gen 4 CPU lanes, dual-channel DDR4 or DDR5, no ECC, and integrated Iris Xe Graphics 80EU, a feature the EPYC entirely lacks.

Head-to-Head Benchmarks

The head-to-head record is a clean sweep for the EPYC 7643: six tests, six wins, with the Core i5-1345U taking none.

Multi-core results show the expected gulf. In Cinebench R15 multi-core the EPYC scores 6515 to the i5's 1311, winning by 79.9%. Cinebench R20 multi-core widens the gap: 27149 versus 4942, an 81.8% difference. Cinebench R23 multi-core is the most lopsided contest of all, with the EPYC's 64642 crushing the i5's 7724 by 88.1%. With nearly five times the cores and eight times the threads, that dominance is exactly what the topology predicts.

Single-core results are less intuitive but equally decisive in the data. The EPYC wins Cinebench R15 single-core 919 to 240, a 73.9% margin. In R20 single-core it leads 3832 to 697, an 81.8% gap. In R23 single-core the result is 9126 against 1724, 81.1% in AMD's favor. Notably, the EPYC's Cinebench R23 single-core score of 9126 is more than the i5-1345U's R23 multi-core score of 7724: one Zen 3 server thread out-renders the entire Intel mobile package in that test.

Context from the rivals list reinforces how these parts are positioned. The Core i5-1345U's average of 19411 sits within a fraction of a percent of the Intel Core Ultra 5 226V (19368, 0.2%), the AMD Ryzen 5 7533HS (19364, 0.2%), the Intel Core i7-10700F (19499, -0.5%), and the Intel Core i7-8700K (19238, 0.9%). The EPYC 7643's average of 18697 lands in a similarly tight cluster with the Intel Core i5-12400 (18683, 0.1%), Intel Core i7-1355U (18730, -0.2%), AMD Ryzen AI 5 330 (18811, -0.6%), and Intel Core i3-14100F (18519, 1%). The averaging methodology blends single- and multi-threaded results differently than raw Cinebench comparisons, which is why a 48-core server chip and a desktop quad-core-adjacent part can share a percentile band with a thin-and-light mobile CPU.

Specification Differences

• Cores/Threads: 10 cores and 12 threads (i5-1345U) versus 48 cores and 96 threads (EPYC 7643)
• Base/Boost Clock: 1600.00 base and 4.70 boost on the Intel chip, 2.30 base and 3.60 boost on the AMD chip
• TDP: 15W versus 225W
• Socket: Intel BGA 1744 versus AMD Socket SP3
• Process Node: 10 nm at Intel versus 7 nm at TSMC
• Cache: 80 KB L1 and 1.25 MB L2 per core with 12 MB shared L3 (Intel) versus 64 KB L1 and 512 KB L2 per core with 256 MB shared L3 (AMD)
• Memory: Dual-channel DDR4/DDR5 without ECC (Intel) versus eight-channel DDR4 with ECC and 204.8 GB/s bandwidth (AMD)
• PCIe: Gen 4 with 8 CPU lanes versus Gen 4 with 128 CPU lanes
• Graphics: Iris Xe Graphics 80EU integrated (Intel) versus none (AMD)
• Market Segment: Mobile versus Server/Workstation
• Release Date: January 2023 for the Intel part, March 2021 for the AMD part
• Launch MSRP: $309 versus $4995

Where Each One Wins

The EPYC 7643 wins every measurable performance contest in the database. Its strength is raw rendering throughput: the R23 multi-core score of 64642 is 88.1% ahead, and even single-threaded it posts 9126 in R23 against the Intel chip's 1724. For any workload that scales across threads, sustained compute, batch rendering, virtualization, the 48-core, 96-thread design with 256 MB of L3 and eight-channel ECC memory is the clear data-backed choice. The 128 PCIe Gen 4 lanes further anchor it as the platform for expansion-heavy server deployments.

The Core i5-1345U's wins are not in the head-to-head benchmark table, where it posts zero victories, but in its engineering envelope. At 15W against the EPYC's 225W, it delivers its performance at a small fraction of the power draw, and it does so with integrated Iris Xe Graphics 80EU that the EPYC cannot offer, since the AMD part requires discrete graphics entirely. Its DDR5 support, mobile BGA packaging, and battery-oriented design make it the only one of the two that can physically live inside a laptop. Its higher average database score of 19411, fueled by strong showings in tests like PassMark data compression (164005) and integer math (52847), confirms it as a capable all-round thin-and-light processor that tracks within a percent of rivals like the Core Ultra 5 226V and Ryzen 5 7533HS.

The Verdict

The benchmark data makes this a one-sided comparison with a clear split. If the goal is maximum throughput, the EPYC 7643 is the answer: it wins all six head-to-head tests, leads by 88.1% in the flagship R23 multi-core benchmark, and surrounds that performance with 48 cores, 96 threads, 256 MB of L3 cache, 128 PCIe Gen 4 lanes, ECC support, and 204.8 GB/s of memory bandwidth. It belongs in servers and workstations, on Socket SP3, with discrete graphics and cooling sized for 225W.

If the goal is a portable, efficient system, the Core i5-1345U is the only viable option of the two. It cannot match the EPYC in any recorded benchmark, but it fits a 15W mobile platform with BGA 1744 integration, DDR5 memory support, and Iris Xe Graphics 80EU on board. Its 73rd percentile standing and 19411 average score place it shoulder to shoulder with modern thin-and-light contemporaries rather than server silicon. These are not competitors; they are specialists, and the database confirms each one excels only in its own domain.