EPYC 7643 vs Xeon 6740E
EPYC 7643
Xeon 6740E
Performance Spectrum - CPU
About PassMark
PassMark CPU Mark evaluates processor speed through complex mathematical computations. It provides a reliable metric to compare multi-core performance, where higher scores indicate faster processing for multitasking, gaming, and heavy workloads.
Value Upgrade Path
This is the official ChipVERSUS Value Rating, comparing raw performance (PassMark) per dollar. Components placed above yours deliver better value for money.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar EPYC 7643
Performance Per Dollar Xeon 6740E
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | EPYC 7643 | Xeon 6740E |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ✅ More affordable ($2,750) | ⚠️ Higher cost ($3,949) |
| Longevity | ✨ Modern (Milan (2021−2023) / 7 nm+) | ✨ Modern (Sierra Forest (2024) / Intel 3 nm) |
💎 Value Proposition
| Insight | EPYC 7643 | Xeon 6740E |
|---|---|---|
| Cost Efficiency | ✅ Better overall value (+43%) | ❌ Lower cost efficiency |
| Upfront Cost | ✅ More affordable ($2,750) | ⚠️ Higher cost ($3,949) |
Performance Check
To accurately isolate CPU performance, all benchmarks below use an NVIDIA RTX 4090 as the reference GPU. This eliminates GPU-side bottlenecks and highlights pure processing throughput differences between the CPUs.
Note: Real-world results may vary based on your actual GPU. CPU performance impact is more visible in processing-intensive titles and high-refresh-rate gaming scenarios.
Technical Specifications
Side-by-side comparison of EPYC 7643 and Xeon 6740E
EPYC 7643
The EPYC 7643 is manufactured by AMD. It was released in 15 March 2021 (4 years ago). It is based on the Milan (2021−2023) architecture. It features 48 cores and 96 threads. Base frequency is 2.3 GHz, with boost up to 3.6 GHz. L3 cache: 256 MB (total). L2 cache: 512 kB (per core). Built on 7 nm+ process technology. Socket: SP3. Thermal design power (TDP): 225 Watt. Memory support: DDR4-3200. Passmark benchmark score: 76,050 points. Launch price was $4,995.
Xeon 6740E
The Xeon 6740E is manufactured by Intel. It was released in 3 June 2024 (1 year ago). It is based on the Sierra Forest (2024) architecture. It features 96 cores and 96 threads. Base frequency is 2.4 GHz, with boost up to 3.2 GHz. L3 cache: 96 MB (total). L2 cache: 4 MB (per module). Built on Intel 3 nm process technology. Socket: LGA4710. Thermal design power (TDP): 250 Watt. Memory support: DDR5-6400. Passmark benchmark score: 76,167 points. Launch price was $5,265.
Processing Power
The EPYC 7643 packs 48 cores / 96 threads, while the Xeon 6740E offers 96 cores / 96 threads — the Xeon 6740E has 48 more cores. Boost clocks reach 3.6 GHz on the EPYC 7643 versus 3.2 GHz on the Xeon 6740E — a 11.8% clock advantage for the EPYC 7643 (base: 2.3 GHz vs 2.4 GHz). The EPYC 7643 uses the Milan (2021−2023) architecture (7 nm+), while the Xeon 6740E uses Sierra Forest (2024) (Intel 3 nm). In PassMark, the EPYC 7643 scores 76,050 against the Xeon 6740E's 76,167 — a 0.2% lead for the Xeon 6740E. L3 cache: 256 MB (total) on the EPYC 7643 vs 96 MB (total) on the Xeon 6740E.
| Feature | EPYC 7643 | Xeon 6740E |
|---|---|---|
| Cores / Threads | 48 / 96 | 96 / 96+100% |
| Boost Clock | 3.6 GHz+12% | 3.2 GHz |
| Base Clock | 2.3 GHz | 2.4 GHz+4% |
| L3 Cache | 256 MB (total)+167% | 96 MB (total) |
| L2 Cache | 512 kB (per core) | 4 MB (per module)+700% |
| Process | 7 nm+ | Intel 3 nm-57% |
| Architecture | Milan (2021−2023) | Sierra Forest (2024) |
| PassMark | 76,050 | 76,167 |
| Geekbench 6 Single | 1,671 | — |
| Geekbench 6 Multi | 15,000 | — |
Memory & Platform
The EPYC 7643 uses the SP3 socket (PCIe 4.0), while the Xeon 6740E uses LGA4710 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-3200 on the EPYC 7643 versus 6400 on the Xeon 6740E — the Xeon 6740E supports 199.8% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Xeon 6740E supports up to 4096 of RAM compared to 4 TB — 199.6% more capacity for professional workloads. Both feature 8-channel memory with ECC support. PCIe lanes: 128 (EPYC 7643) vs 80 (Xeon 6740E) — the EPYC 7643 offers 48 more lanes for additional GPUs or NVMe drives. Chipset compatibility: SP3 (EPYC 7643) and C741 (Xeon 6740E).
| Feature | EPYC 7643 | Xeon 6740E |
|---|---|---|
| Socket | SP3 | LGA4710 |
| PCIe Generation | PCIe 4.0 | PCIe 4.0 |
| Max RAM Speed | DDR4-3200 | 6400+159900% |
| Max RAM Capacity | 4 TB+104857500% | 4096 |
| RAM Channels | 8 | 8 |
| ECC Support | ✅ | ✅ |
| PCIe Lanes | 128+60% | 80 |
Advanced Features
Neither processor supports overclocking. Only the Xeon 6740E supports AVX-512 instructions — important for machine learning and scientific applications. Virtualization support: AMD-V (EPYC 7643) vs VT-x, VT-d, TDX (Xeon 6740E). Primary use case: EPYC 7643 targets Server. Direct competitor: EPYC 7643 rivals EPYC 7443P; Xeon 6740E rivals EPYC 9005.
| Feature | EPYC 7643 | Xeon 6740E |
|---|---|---|
| Integrated GPU | No | No |
| IGPU Model | None | None |
| Unlocked | No | No |
| AVX-512 | No | Yes |
| Virtualization | AMD-V | VT-x, VT-d, TDX |
| Target Use | Server | — |
Value Analysis
The EPYC 7643 launched at $4995 MSRP, while the Xeon 6740E debuted at $5265. At current prices ($2750 vs $3949), the EPYC 7643 is $1199 cheaper. In terms of value (PassMark points per dollar), the EPYC 7643 delivers 27.7 pts/$ vs 19.3 pts/$ for the Xeon 6740E — making the EPYC 7643 the 35.6% better value option.
| Feature | EPYC 7643 | Xeon 6740E |
|---|---|---|
| MSRP | $4995-5% | $5265 |
| Avg Price (30d) | $2750-30% | $3949 |
| Performance per Dollar | 27.7+44% | 19.3 |
| Release Date | 2021 | 2024 |
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