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