EPYC 7643 vs EPYC 7663
EPYC 7643
EPYC 7663
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 EPYC 7663
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | EPYC 7643 | EPYC 7663 |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ✅ More affordable ($2,750) | ⚠️ Higher cost ($6,366) |
| Longevity | ✨ Modern (Milan (2021−2023) / 7 nm+) | ✨ Modern (Milan (2021−2023) / 7 nm+) |
💎 Value Proposition
| Insight | EPYC 7643 | EPYC 7663 |
|---|---|---|
| Cost Efficiency | ✅ Better overall value (+114%) | ❌ Lower cost efficiency |
| Upfront Cost | ✅ More affordable ($2,750) | ⚠️ Higher cost ($6,366) |
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 EPYC 7663
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.
EPYC 7663
The EPYC 7663 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 56 cores and 112 threads. Base frequency is 2 GHz, with boost up to 3.5 GHz. L3 cache: 256 MB (total). L2 cache: 512 kB (per core). Built on 7 nm+ process technology. Socket: SP3. Thermal design power (TDP): 240 Watt. Memory support: DDR4-3200. Passmark benchmark score: 82,120 points. Launch price was $6,366.
Processing Power
The EPYC 7643 packs 48 cores / 96 threads, while the EPYC 7663 offers 56 cores / 112 threads — the EPYC 7663 has 8 more cores. Boost clocks reach 3.6 GHz on the EPYC 7643 versus 3.5 GHz on the EPYC 7663 — a 2.8% clock advantage for the EPYC 7643 (base: 2.3 GHz vs 2 GHz). Both are built on the Milan (2021−2023) architecture using a 7 nm+ process. In PassMark, the EPYC 7643 scores 76,050 against the EPYC 7663's 82,120 — a 7.7% lead for the EPYC 7663. Geekbench 6 single-core — the metric most relevant to gaming — records 1,671 vs 1,370, a 19.8% lead for the EPYC 7643 that directly translates to higher frame rates. Multi-core Geekbench: 15,000 vs 12,380 (19.1% advantage for the EPYC 7643). Both processors carry 256 MB (total) of L3 cache.
| Feature | EPYC 7643 | EPYC 7663 |
|---|---|---|
| Cores / Threads | 48 / 96 | 56 / 112+17% |
| Boost Clock | 3.6 GHz+3% | 3.5 GHz |
| Base Clock | 2.3 GHz+15% | 2 GHz |
| L3 Cache | 256 MB (total) | 256 MB (total) |
| L2 Cache | 512 kB (per core) | 512 kB (per core) |
| Process | 7 nm+ | 7 nm+ |
| Architecture | Milan (2021−2023) | Milan (2021−2023) |
| PassMark | 76,050 | 82,120+8% |
| Geekbench 6 Single | 1,671+22% | 1,370 |
| Geekbench 6 Multi | 15,000+21% | 12,380 |
Memory & Platform
Both processors use the SP3 socket with PCIe 4.0. Both support up to DDR4-3200 memory speed. The EPYC 7663 supports up to 4096 GB of RAM compared to 4 TB — 199.6% more capacity for professional workloads. Both feature 8-channel memory with ECC support. Both provide 128 PCIe lanes. Chipset compatibility: SP3 (EPYC 7643) and SP3 (EPYC 7663).
| Feature | EPYC 7643 | EPYC 7663 |
|---|---|---|
| Socket | SP3 | SP3 |
| PCIe Generation | PCIe 4.0 | PCIe 4.0 |
| Max RAM Speed | DDR4-3200 | DDR4-3200 |
| Max RAM Capacity | 4 TB | 4096 GB |
| RAM Channels | 8 | 8 |
| ECC Support | ✅ | ✅ |
| PCIe Lanes | 128 | 128 |
Advanced Features
Neither processor supports overclocking. Both support AMD-V virtualization. Primary use case: EPYC 7643 targets Server, EPYC 7663 targets Server. Direct competitor: EPYC 7643 rivals EPYC 7443P; EPYC 7663 rivals Xeon Platinum 8380.
| Feature | EPYC 7643 | EPYC 7663 |
|---|---|---|
| Integrated GPU | No | No |
| IGPU Model | None | None |
| Unlocked | No | No |
| AVX-512 | No | No |
| Virtualization | AMD-V | AMD-V |
| Target Use | Server | Server |
Value Analysis
The EPYC 7643 launched at $4995 MSRP, while the EPYC 7663 debuted at $6366. At current prices ($2750 vs $6366), the EPYC 7643 is $3616 cheaper. In terms of value (PassMark points per dollar), the EPYC 7643 delivers 27.7 pts/$ vs 12.9 pts/$ for the EPYC 7663 — making the EPYC 7643 the 72.8% better value option.
| Feature | EPYC 7643 | EPYC 7663 |
|---|---|---|
| MSRP | $4995-22% | $6366 |
| Avg Price (30d) | $2750-57% | $6366 |
| Performance per Dollar | 27.7+115% | 12.9 |
| Release Date | 2021 | 2021 |
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