EPYC 7643 vs Ryzen Threadripper 3990X
EPYC 7643
Ryzen Threadripper 3990X
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 Ryzen Threadripper 3990X
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | EPYC 7643 | Ryzen Threadripper 3990X |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ✅ More affordable ($2,750) | ⚠️ Higher cost ($2,850) |
| Longevity | ✨ Modern (Milan (2021−2023) / 7 nm+) | ✨ Modern (Matisse (2019−2020) / 7 nm, 12 nm) |
💎 Value Proposition
| Insight | EPYC 7643 | Ryzen Threadripper 3990X |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ✅ Better overall value (+1%) |
| Upfront Cost | ✅ More affordable ($2,750) | ⚠️ Higher cost ($2,850) |
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 Ryzen Threadripper 3990X
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.
Ryzen Threadripper 3990X
The Ryzen Threadripper 3990X is manufactured by AMD. It was released in 7 February 2020 (5 years ago). It is based on the Matisse (2019−2020) architecture. It features 64 cores and 128 threads. Base frequency is 2.9 GHz, with boost up to 4.3 GHz. L3 cache: 256 MB. L2 cache: 512K (per core). Built on 7 nm, 12 nm process technology. Socket: TR4. Thermal design power (TDP): 280 Watt. Memory support: DDR4-3200. Passmark benchmark score: 79,889 points. Launch price was $3,999.
Processing Power
The EPYC 7643 packs 48 cores / 96 threads, while the Ryzen Threadripper 3990X offers 64 cores / 128 threads — the Ryzen Threadripper 3990X has 16 more cores. Boost clocks reach 3.6 GHz on the EPYC 7643 versus 4.3 GHz on the Ryzen Threadripper 3990X — a 17.7% clock advantage for the Ryzen Threadripper 3990X (base: 2.3 GHz vs 2.9 GHz). The EPYC 7643 uses the Milan (2021−2023) architecture (7 nm+), while the Ryzen Threadripper 3990X uses Matisse (2019−2020) (7 nm, 12 nm). In PassMark, the EPYC 7643 scores 76,050 against the Ryzen Threadripper 3990X's 79,889 — a 4.9% lead for the Ryzen Threadripper 3990X. Geekbench 6 single-core — the metric most relevant to gaming — records 1,671 vs 1,961, a 16% lead for the Ryzen Threadripper 3990X that directly translates to higher frame rates. Multi-core Geekbench: 15,000 vs 22,045 (38% advantage for the Ryzen Threadripper 3990X). L3 cache: 256 MB (total) on the EPYC 7643 vs 256 MB on the Ryzen Threadripper 3990X.
| Feature | EPYC 7643 | Ryzen Threadripper 3990X |
|---|---|---|
| Cores / Threads | 48 / 96 | 64 / 128+33% |
| Boost Clock | 3.6 GHz | 4.3 GHz+19% |
| Base Clock | 2.3 GHz | 2.9 GHz+26% |
| L3 Cache | 256 MB (total) | 256 MB |
| L2 Cache | 512 kB (per core) | 512K (per core) |
| Process | 7 nm+ | 7 nm, 12 nm |
| Architecture | Milan (2021−2023) | Matisse (2019−2020) |
| PassMark | 76,050 | 79,889+5% |
| Cinebench R23 Multi | — | 64,366 |
| Geekbench 6 Single | 1,671 | 1,961+17% |
| Geekbench 6 Multi | 15,000 | 22,045+47% |
Memory & Platform
The EPYC 7643 uses the SP3 socket (PCIe 4.0), while the Ryzen Threadripper 3990X uses TR4 (PCIe 4.0) — making them incompatible on the same motherboard. Both support up to DDR4-3200 memory speed. The Ryzen Threadripper 3990X supports up to 256 GB of RAM compared to 4 TB — 193.8% more capacity for professional workloads. Memory channels: 8 (EPYC 7643) vs 4 (Ryzen Threadripper 3990X). PCIe lanes: 128 (EPYC 7643) vs 88 (Ryzen Threadripper 3990X) — the EPYC 7643 offers 40 more lanes for additional GPUs or NVMe drives. Chipset compatibility: SP3 (EPYC 7643) and TRX40 (Ryzen Threadripper 3990X).
| Feature | EPYC 7643 | Ryzen Threadripper 3990X |
|---|---|---|
| Socket | SP3 | TR4 |
| PCIe Generation | PCIe 4.0 | PCIe 4.0 |
| Max RAM Speed | DDR4-3200 | DDR4-3200 |
| Max RAM Capacity | 4 TB+1500% | 256 GB |
| RAM Channels | 8+100% | 4 |
| ECC Support | ✅ | ✅ |
| PCIe Lanes | 128+45% | 88 |
Advanced Features
Only the Ryzen Threadripper 3990X has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Virtualization support: AMD-V (EPYC 7643) vs true (Ryzen Threadripper 3990X). Primary use case: EPYC 7643 targets Server. Direct competitor: EPYC 7643 rivals EPYC 7443P; Ryzen Threadripper 3990X rivals Core i9-10980XE.
| Feature | EPYC 7643 | Ryzen Threadripper 3990X |
|---|---|---|
| Integrated GPU | No | No |
| IGPU Model | None | None |
| Unlocked | No | Yes |
| AVX-512 | No | No |
| Virtualization | AMD-V | true |
| Target Use | Server | — |
Value Analysis
The EPYC 7643 launched at $4995 MSRP, while the Ryzen Threadripper 3990X debuted at $3990. At current prices ($2750 vs $2850), the EPYC 7643 is $100 cheaper. In terms of value (PassMark points per dollar), the EPYC 7643 delivers 27.7 pts/$ vs 28.0 pts/$ for the Ryzen Threadripper 3990X — making the Ryzen Threadripper 3990X the 1.4% better value option.
| Feature | EPYC 7643 | Ryzen Threadripper 3990X |
|---|---|---|
| MSRP | $4995 | $3990-20% |
| Avg Price (30d) | $2750-4% | $2850 |
| Performance per Dollar | 27.7 | 28.0+1% |
| Release Date | 2021 | 2019 |
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