EPYC 7643
Ryzen Threadripper 3990X
EPYC 7643 vs Ryzen Threadripper 3990X Performance Spectrum
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.
EPYC 7643 vs Ryzen Threadripper 3990X FPS Benchmarks
Predicted gaming performance across popular games. Tested paired with GeForce RTX 5090 to isolate CPU performance.
Search any supported game below to compare 1080p FPS for both components.
Path of Exile 2
Counter-Strike 2
League of Legends
Valorant
Among Us
Apex Legends
ARC Raiders
Baldur's Gate 3
Call of Duty: Black Ops 6
EPYC 7643 vs Ryzen Threadripper 3990X: Pros, Cons & Final Verdict
See where each CPU makes more sense in practice: gaming, heavier work, platform cost, power draw, and upgrade path.
EPYC 7643
2021Why buy it
- ✅Draws 225W instead of 280W, a 55W reduction.
- ✅45.5% more PCIe lanes (128 vs 88) for storage and expansion-heavy builds.
Trade-offs
- ❌Worse for gaming: lower average FPS than Ryzen Threadripper 3990X across 50 shared CPU benchmark tests.
- ❌Lower Geekbench multi-core (15,000 vs 22,045).
- ❌Lower PassMark per dollar, at 15.2 vs 20.0 PassMark/$ ($4,995 MSRP vs $3,990 MSRP).
Ryzen Threadripper 3990X
2019Why buy it
- ✅Better for gaming: +15.8% higher average FPS across 50 shared CPU benchmark tests.
- ✅Costs $1,005 less on MSRP ($3,990 MSRP vs $4,995 MSRP).
- ✅Delivers 31.5% more PassMark for each dollar spent, at 20.0 vs 15.2 PassMark/$ ($3,990 MSRP vs $4,995 MSRP).
Trade-offs
- ❌24.4% higher power demand at 280W vs 225W.
Quick Answers
So, is Ryzen Threadripper 3990X better than EPYC 7643?
Which one is better for gaming?
Which one is better for streaming, content creation, and heavy multitasking?
Which one is the smarter buy today, not just the cheaper CPU?
Which one is more future-proof for 2026 and beyond?
EPYC 7643 vs Ryzen Threadripper 3990X Technical Specifications
Side-by-side specs, architecture details, clocks, memory, power, and platform differences.
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 EPYC 7643 supports up to 4 TB of RAM compared to 256 GB — 1500% 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 | Yes | Yes |
| 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
At launch, the EPYC 7643 was priced at $4995, while the Ryzen Threadripper 3990X came in at $3990. On launch pricing ($4995 vs $3990), Ryzen Threadripper 3990X was $1005 cheaper. In terms of value on MSRP (PassMark points per dollar), the EPYC 7643 delivers 15.2 pts/$ vs 20.0 pts/$ for the Ryzen Threadripper 3990X — making the Ryzen Threadripper 3990X the 27.2% better value option.
| Feature | EPYC 7643 | Ryzen Threadripper 3990X |
|---|---|---|
| MSRP | $4995 | $3990-20% |
| Performance per Dollar | 15.2 | 20.0+32% |
| Release Date | 2021 | 2019 |
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