AMD Ryzen Threadripper 3990X vs Intel Core i5-8500 Comparison

The data is unambiguous: the AMD Ryzen Threadripper 3990X wins every single head-to-head benchmark against the Intel Core i5-8500, with a perfect 8-0 sweep. The Threadripper's dominance is so absolute that its smallest victory is an 8.8% lead in Geekbench single-core, while its largest is an 88.2% margin in Cinebench R15 single-core. The i5-8500 is a 6-core, 6-thread Coffee Lake desktop chip aimed at mainstream users, while the Threadripper 3990X is a 64-core, 128-thread Zen 2 behemoth for workstations. The verdict is simple: choose the i5-8500 only if you need a basic, low-power desktop processor with integrated graphics; choose the Threadripper 3990X if your workload scales with core count and you demand maximum multi-threaded performance.

The Verdict

The benchmark results dictate a clear split in purpose. The Intel Core i5-8500, with an average benchmark score of 13142 and a 68th percentile ranking among all CPUs, is a competent mainstream processor. Its nearest rivals, such as the Intel Core i7-7700K (avg score 13291, 1.1% faster) and the Intel Core i5-9400F (avg score 13041, 0.8% slower), show it sits in a tightly contested mid-range tier. The AMD Ryzen Threadripper 3990X, despite its slightly lower average benchmark score of 12786 and the same 68th percentile, is a completely different beast. Its nearest rivals include the Intel Xeon Gold 6348 (avg score 12746, 0.3% slower) and the AMD EPYC 7502 (avg score 12709, 0.6% slower), placing it in server-class territory.

The i5-8500 is the rational pick for a budget desktop where integrated graphics and a 65W TDP matter more than raw compute. It offers six cores with a boost clock of 4.10 GHz, which is sufficient for everyday tasks and light productivity. The Threadripper 3990X, however, is for users who prioritize throughput above all else. Its 64 cores and 128 threads, paired with a quad-channel memory bus and 256 MB of L3 cache, make it a rendering and compilation powerhouse. The data shows that the Threadripper is not merely faster; it is in a different performance class, often scoring over eight times higher in multi-threaded workloads. If your software can utilize 128 threads, the choice is obvious. If it cannot, the i5-8500's lower power draw and integrated GPU make it a more practical, if less spectacular, option.

Architecture Differences

The two processors are built on fundamentally different architectures and process nodes. The Intel Core i5-8500 uses the Coffee Lake architecture on Intel's 14 nm process, with a die size of 154 mm². In contrast, the AMD Ryzen Threadripper 3990X is based on Zen 2, fabricated by TSMC on a 7 nm node, and consists of eight chiplets, each measuring 74 mm², for a combined transistor count of 30,400 million. This process advantage gives the Threadripper a significant efficiency and density edge, which is reflected in its core count.

Core and thread configurations differ dramatically. The i5-8500 offers 6 cores and 6 threads, with no hyper-threading, while the Threadripper 3990X provides 64 cores and 128 threads. The cache hierarchy also diverges sharply: the i5-8500 has 64 KB of L1 and 256 KB of L2 per core, plus 9 MB of shared L3 cache. The Threadripper 3990X also has 64 KB of L1 per core, but doubles the L2 to 512 KB per core and offers a massive 256 MB of L3 cache. Memory support is another differentiator: the i5-8500 is dual-channel with 42.7 GB/s bandwidth, while the Threadripper 3990X is quad-channel with 102.4 GB/s bandwidth. The Threadripper also supports PCIe Gen 4 with 64 lanes, versus the i5-8500's PCIe Gen 3 with 16 lanes. The i5-8500 includes integrated UHD Graphics 630; the Threadripper 3990X has none. The Threadripper's multiplier is unlocked, whereas the i5-8500's is locked.

Head-to-Head Benchmarks

The head-to-head results show a systematic thrashing. In Cinebench R15 multi-core, the Threadripper 3990X scores 6866 against the i5-8500's 814, an 88.1% lead. The single-core result is equally lopsided: 969 versus 114, an 88.2% margin. These deltas are consistent across the Cinebench suite. In Cinebench R20 multi-core, the Threadripper scores 28612 versus 3393 (88.1% ahead); in single-core, 4039 versus 478 (88.2% ahead). Cinebench R23 multi-core shows 68124 versus 8079 (88.1% ahead), and single-core shows 9617 versus 1140 (88.1% ahead). The Threadripper's dominance is not limited to Cinebench; Geekbench multi-core shows 20912 versus 4752, a 77.3% lead.

The only benchmark where the gap narrows is Geekbench single-core, where the Threadripper scores 1472 versus the i5-8500's 1342, an 8.8% lead. This is notable because it shows that even in lightly threaded workloads, the Threadripper's higher boost clock of 4.30 GHz (versus 4.10 GHz) and superior IPC from the Zen 2 architecture give it an edge, albeit a smaller one. The data indicates that the Threadripper 3990X is not just a multi-core monster; it also wins every single-threaded test, albeit by smaller margins. The i5-8500 has no benchmark where it comes out ahead, and its PassMark scores (e.g., 9532 multi-thread, 2441 single-thread) are simply not competitive with the Threadripper's 3DMark results, which range from 695 single-thread to 18441 max-threads.

FAQ

Q: Which processor is faster in multi-core workloads?

A: The AMD Ryzen Threadripper 3990X is overwhelmingly faster. In Cinebench R23 multi-core, it scores 68124 versus the Intel Core i5-8500's 8079, an 88.1% lead. The Geekbench multi-core result is similar: 20912 versus 4752, a 77.3% margin.

Q: Does the Intel Core i5-8500 win any benchmark?

A: No. The head-to-head data shows the Threadripper 3990X wins all 8 benchmarks. The i5-8500's closest result is a single-core Geekbench score of 1342, but the Threadripper still beats it with 1472, an 8.8% lead.

Q: What are the core and thread counts?

A: The Intel Core i5-8500 has 6 cores and 6 threads. The AMD Ryzen Threadripper 3990X has 64 cores and 128 threads, which is more than ten times the thread count.

Q: Which processor has a higher boost clock?

A: The AMD Ryzen Threadripper 3990X has a boost clock of 4.30 GHz, while the Intel Core i5-8500 has a boost clock of 4.10 GHz. The Threadripper also has a slightly lower base clock at 2.90 GHz versus 3.00 GHz.

Q: Do both processors support ECC memory?

A: No. Neither the Intel Core i5-8500 nor the AMD Ryzen Threadripper 3990X supports ECC memory, according to the data.

Q: What is the memory bandwidth difference?

A: The Intel Core i5-8500 has a dual-channel memory bus with 42.7 GB/s bandwidth. The AMD Ryzen Threadripper 3990X has a quad-channel bus with 102.4 GB/s bandwidth, which is 2.4 times higher.

Where Each One Wins

The AMD Ryzen Threadripper 3990X wins in every measured category. For multi-threaded rendering, video encoding, scientific simulations, and software compilation, the Threadripper's 64 cores and 128 threads deliver Cinebench R23 multi-core scores of 68124, which is 88.1% higher than the i5-8500. Its quad-channel memory and 256 MB L3 cache also give it a massive advantage in data-heavy workloads. Even in single-threaded tasks, the Threadripper wins, albeit by a smaller 8.8% margin in Geekbench single-core, thanks to its higher boost clock. The Threadripper is also the only one with an unlocked multiplier, allowing overclocking, and it supports PCIe Gen 4 with 64 lanes, which is essential for high-bandwidth peripherals.

The Intel Core i5-8500 has no benchmark wins, but it has other advantages. Its 65W TDP is dramatically lower than the Threadripper's 280W, making it suitable for compact, low-power builds. It includes integrated UHD Graphics 630, so no discrete GPU is required for basic display output. Its dual-channel memory and smaller cache are sufficient for office work, web browsing, and light gaming. The i5-8500 is also an end-of-life product, while the Threadripper is active, but the i5's lower power and integrated graphics make it the practical choice for a simple desktop. The data shows the Threadripper is for uncompromising performance; the i5 is for utility.

Specification Differences

The two processors differ in nearly every specification. The Intel Core i5-8500 has 6 cores and 6 threads, while the AMD Ryzen Threadripper 3990X has 64 cores and 128 threads. Base clocks are 3.00 GHz for the i5 and 2.90 GHz for the Threadripper, with boost clocks of 4.10 GHz and 4.30 GHz, respectively. TDP is 65W for the i5 and 280W for the Threadripper. The i5 uses the Intel Socket 1151, while the Threadripper uses the AMD Socket TRX4. The i5's process node is 14 nm from Intel, while the Threadripper uses 7 nm from TSMC, with a die size of 154 mm² versus 8x 74 mm². The i5 has 9 MB of L3 cache; the Threadripper has 256 MB. Memory bandwidth is 42.7 GB/s for the i5 versus 102.4 GB/s for the Threadripper, with dual-channel versus quad-channel buses. The i5 has PCIe Gen 3 with 16 lanes, while the Threadripper has PCIe Gen 4 with 64 lanes. The i5 has integrated UHD Graphics 630; the Threadripper has none. The i5's multiplier is locked; the Threadripper's is unlocked. The i5 launched with an MSRP of $192, while the Threadripper launched with an MSRP of $3990.