EPYC 7643P vs EPYC 9255
EPYC 7643P
EPYC 9255
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 7643P
Performance Per Dollar EPYC 9255
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | EPYC 7643P | EPYC 9255 |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ⚠️ Higher cost ($2,722) | ✅ More affordable ($1,934) |
| Longevity | ✨ Modern (Milan (2021−2023) / 7 nm) | ✨ Modern (Turin (2024) / 4 nm) |
💎 Value Proposition
| Insight | EPYC 7643P | EPYC 9255 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ✅ Better overall value (+38%) |
| Upfront Cost | ⚠️ Higher cost ($2,722) | ✅ More affordable ($1,934) |
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 7643P and EPYC 9255
EPYC 7643P
The EPYC 7643P is manufactured by AMD. It was released in 5 September 2023 (2 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. Passmark benchmark score: 77,307 points. Launch price was $2,722.
EPYC 9255
The EPYC 9255 is manufactured by AMD. It was released in 10 October 2024 (1 year ago). It is based on the Turin (2024) architecture. It features 24 cores and 48 threads. Base frequency is 3.25 GHz, with boost up to 4.8 GHz. L3 cache: 128 MB (total). L2 cache: 1 MB (per core). Built on 4 nm process technology. Socket: SP5. Thermal design power (TDP): 200 Watt. Memory support: DDR5. Passmark benchmark score: 75,809 points. Launch price was $2,495.
Processing Power
The EPYC 7643P packs 48 cores / 96 threads, while the EPYC 9255 offers 24 cores / 48 threads — the EPYC 7643P has 24 more cores. Boost clocks reach 3.6 GHz on the EPYC 7643P versus 4.8 GHz on the EPYC 9255 — a 28.6% clock advantage for the EPYC 9255 (base: 2.3 GHz vs 3.25 GHz). The EPYC 7643P uses the Milan (2021−2023) architecture (7 nm), while the EPYC 9255 uses Turin (2024) (4 nm). In PassMark, the EPYC 7643P scores 77,307 against the EPYC 9255's 75,809 — a 2% lead for the EPYC 7643P. L3 cache: 256 MB (total) on the EPYC 7643P vs 128 MB (total) on the EPYC 9255.
| Feature | EPYC 7643P | EPYC 9255 |
|---|---|---|
| Cores / Threads | 48 / 96+100% | 24 / 48 |
| Boost Clock | 3.6 GHz | 4.8 GHz+33% |
| Base Clock | 2.3 GHz | 3.25 GHz+41% |
| L3 Cache | 256 MB (total)+100% | 128 MB (total) |
| L2 Cache | 512 kB (per core) | 1 MB (per core)+100% |
| Process | 7 nm | 4 nm-43% |
| Architecture | Milan (2021−2023) | Turin (2024) |
| PassMark | 77,307+2% | 75,809 |
Memory & Platform
The EPYC 7643P uses the SP3 socket (PCIe 4.0), while the EPYC 9255 uses SP5 (PCIe 5.0) — making them incompatible on the same motherboard. Maximum memory speed reaches 3200 on the EPYC 7643P versus 4800 on the EPYC 9255 — the EPYC 9255 supports 40% faster memory, which can translate to measurable gains in memory-sensitive workloads. The EPYC 9255 supports up to 6144 of RAM compared to 4096 — 40% more capacity for professional workloads. Memory channels: 8 (EPYC 7643P) vs 12 (EPYC 9255). Both provide 128 PCIe lanes. Chipset compatibility: SP3 (EPYC 7643P) and SP5 (EPYC 9255).
| Feature | EPYC 7643P | EPYC 9255 |
|---|---|---|
| Socket | SP3 | SP5 |
| PCIe Generation | PCIe 4.0 | PCIe 5.0+25% |
| Max RAM Speed | 3200 | 4800+50% |
| Max RAM Capacity | 4096 | 6144+50% |
| RAM Channels | 8 | 12+50% |
| ECC Support | ✅ | ✅ |
| PCIe Lanes | 128 | 128 |
Advanced Features
Neither processor supports overclocking. Only the EPYC 9255 supports AVX-512 instructions — important for machine learning and scientific applications. Virtualization support: VT-x, VT-d, SEV (EPYC 7643P) vs VT-x, VT-d, SEV-SNP (EPYC 9255). Direct competitor: EPYC 7643P rivals Xeon Platinum 8380; EPYC 9255 rivals Xeon Platinum 8480+.
| Feature | EPYC 7643P | EPYC 9255 |
|---|---|---|
| Integrated GPU | No | No |
| IGPU Model | None | None |
| Unlocked | No | No |
| AVX-512 | No | Yes |
| Virtualization | VT-x, VT-d, SEV | VT-x, VT-d, SEV-SNP |
Value Analysis
The EPYC 7643P launched at $2722 MSRP, while the EPYC 9255 debuted at $2495. At current prices ($2722 vs $1934), the EPYC 9255 is $788 cheaper. In terms of value (PassMark points per dollar), the EPYC 7643P delivers 28.4 pts/$ vs 39.2 pts/$ for the EPYC 9255 — making the EPYC 9255 the 31.9% better value option.
| Feature | EPYC 7643P | EPYC 9255 |
|---|---|---|
| MSRP | $2722 | $2495-8% |
| Avg Price (30d) | $2722 | $1934-29% |
| Performance per Dollar | 28.4 | 39.2+38% |
| Release Date | 2023 | 2024 |
Top Performing CPUs
The most powerful cpus ranked by PassMark CPU Mark benchmark scores.
You May Also Compare
Similar CPU comparisons based on EPYC 7643P and EPYC 9255
