AMD Ryzen Threadripper 3990X vs Intel Core i7-7700K Comparison

The Intel Core i7-7700K and the AMD Ryzen Threadripper 3990X represent two entirely different philosophies in desktop computing. The data shows a predictable outcome in raw throughput, but the single-threaded results reveal a more nuanced story. Benchmark results indicate that the Threadripper 3990X dominates in every multi-core and most single-core tests, while the 7700K manages a narrow victory in one specific Geekbench test.

Head-to-Head Benchmarks

The gulf in multi-threaded performance is staggering. In Cinebench R15, the Threadripper 3990X scores 6866 versus the 7700K’s 825, a delta of -88% from the perspective of the Intel part. This pattern repeats in Cinebench R20, where the AMD processor scores 28612 against 3439, and in Cinebench R23, where it hits 68124 against 8189. Every one of these multi-core deltas is -88%, indicating a consistent eight-fold advantage in raw rendering throughput.

The single-core results are equally decisive, though less extreme. In Cinebench R15 single-core, the Threadripper 3990X scores 969 versus 116, again a -88% delta. The R20 single-core test shows 4039 against 485, and R23 single-core shows 9617 versus 1156. These are not marginal wins; the AMD chip is over eight times faster in these tests. The only exception is Geekbench single-core, where the Intel Core i7-7700K scores 1547 against 1472, a 5.1% advantage. This is the sole benchmark in the head-to-head set where the older Intel architecture prevails.

Geekbench multi-core tells the same story as Cinebench. The Threadripper 3990X scores 20912 versus 5395, a delta of -74.2%. While this is a smaller percentage gap than the Cinebench tests, the absolute difference of over 15,000 points is substantial. Across the eight recorded head-to-head comparisons, the AMD processor wins seven, with the Intel part taking only that single Geekbench single-core result.

Architecture Differences

The architectural divide is fundamental. The Intel Core i7-7700K is built on the Kaby Lake architecture using a 14 nm process, while the AMD Ryzen Threadripper 3990X uses Zen 2 on a 7 nm node. The transistor count reflects this: the Threadripper packs 30,400 million transistors across a die size of 8x 74 mm², whereas the 7700K has no transistor count or die size listed in the database.

Core and thread counts are the primary drivers of the performance gap. The 7700K has 4 cores and 8 threads, while the Threadripper 3990X has 64 cores and 128 threads. This 16x difference in core count and 16x difference in thread count explains the consistent -88% multi-core deltas. The cache hierarchy also differs sharply: both have 64 KB of L1 per core, but the 7700K has 256 KB of L2 per core and 8 MB of shared L3, whereas the Threadripper has 512 KB of L2 per core and a massive 256 MB of L3.

Memory architecture is another differentiator. Both support DDR4, but the 7700K runs dual-channel with 38.4 GB/s of bandwidth, while the Threadripper 3990X runs quad-channel with 102.4 GB/s. The PCIe implementation is also generations apart: the Intel part offers Gen 3 with 16 lanes (CPU only), while the AMD part provides Gen 4 with 64 lanes (CPU only). Neither supports ECC memory.

The integrated graphics situation is unique. The 7700K includes an HD 630 iGPU, while the Threadripper 3990X has no integrated graphics at all. This means the Threadripper requires a discrete GPU for any display output, while the 7700K can operate with a basic setup. Both have unlocked multipliers, allowing overclocking, but the base and boost clocks differ: the 7700K runs at 4.20 GHz base and 4.50 GHz boost, while the Threadripper runs at 2.90 GHz base and 4.30 GHz boost.

The Verdict

The data is unambiguous for productivity and rendering workloads. The AMD Ryzen Threadripper 3990X is the clear choice for any multi-threaded task, with eight times the Cinebench performance of the Intel Core i7-7700K. The 64 cores and 128 threads, combined with 256 MB of L3 cache and quad-channel memory, make it a workstation-class processor. The 7700K’s single 5.1% victory in Geekbench single-core does not compensate for its 88% deficit in every other test.

For users whose primary workload is lightly threaded, the 7700K has a marginal edge in that one specific metric, but it is not enough to recommend it over the Threadripper. The database shows the 7700K’s average benchmark score is 13291, while the Threadripper’s is 12786, but this aggregate is skewed by the fact that the 7700K has many more Passmark tests recorded, which are single-thread oriented. The head-to-head tests, which cover Cinebench and Geekbench, are overwhelmingly in favor of the AMD processor.

The production status of both is listed as Active, but the release dates differ: the 7700K launched on 2017-01-02, while the Threadripper 3990X launched on 2020-02-06. The difference in market positioning is clear from the specifications. The 7700K is a quad-core desktop part, while the Threadripper is a 64-core enthusiast part. The verdict from the data is simple: choose the Threadripper 3990X for maximum throughput, and only consider the 7700K if the single Geekbench single-core score is the sole criterion.

Specification Differences

The following fields differ between the two processors:

• Cores: 4 (Intel) vs 64 (AMD)
• Threads: 8 (Intel) vs 128 (AMD)
• Base Clock: 4.20 GHz (Intel) vs 2.90 GHz (AMD)
• Boost Clock: 4.50 GHz (Intel) vs 4.30 GHz (AMD)
• TDP: 91 W (Intel) vs 280 W (AMD)
• Socket: Intel Socket 1151 vs AMD Socket TRX4
• Architecture: Kaby Lake vs Zen 2
• Codename: Kaby Lake vs Castle Peak
• Process Node: 14 nm vs 7 nm
• Foundry: Intel vs TSMC
• Transistors: Not listed vs 30,400 million
• Die Size: Not listed vs 8x 74 mm²
• L2 Cache: 256 KB (per core) vs 512 KB (per core)
• L3 Cache: 8 MB (shared) vs 256 MB
• Memory Bus: Dual-channel vs Quad-channel
• Memory Bandwidth: 38.4 GB/s vs 102.4 GB/s
• PCIe: Gen 3, 16 Lanes (CPU only) vs Gen 4, 64 Lanes (CPU only)
• Integrated Graphics: HD 630 vs None
• Release Date: 2017-01-02 vs 2020-02-06
• Part Number: SR33A vs 100-000000163100-100000163WOF

FAQ

Q: Which processor is faster in Cinebench R23 multi-core?

A: The AMD Ryzen Threadripper 3990X scores 68124, while the Intel Core i7-7700K scores 8189, a delta of -88% for the Intel part.

Q: Does the Intel Core i7-7700K win any benchmark in the head-to-head data?

A: Yes, it wins Geekbench single-core with a score of 1547 versus the Threadripper’s 1472, a 5.1% advantage.

Q: What is the memory bandwidth difference?

A: The Intel Core i7-7700K has 38.4 GB/s with dual-channel memory, while the AMD Ryzen Threadripper 3990X has 102.4 GB/s with quad-channel memory.

Q: How many cores and threads does each processor have?

A: The Intel Core i7-7700K has 4 cores and 8 threads. The AMD Ryzen Threadripper 3990X has 64 cores and 128 threads.

Q: Do both processors support ECC memory?

A: No, neither processor supports ECC memory, according to the database.

Q: What is the TDP of each processor?

A: The Intel Core i7-7700K has a TDP of 91 W. The AMD Ryzen Threadripper 3990X has a TDP of 280 W.