AMD Ryzen 5 8645HS vs AMD Ryzen 7 3700X Comparison

The Verdict

The benchmark data splits this comparison cleanly along core count versus architectural generation. The AMD Ryzen 7 3700X, an eight-core, sixteen-thread desktop chip from the 3000 series, wins 5 of the 13 recorded head-to-head tests. The AMD Ryzen 5 8645HS, a six-core, twelve-thread mobile processor from the 8000 series, wins 8 tests. The overall average benchmark scores are close: the 3700X records an average of 34260, placing it in the 84th percentile of all CPUs, while the 8645HS records 33244, placing it in the 83rd percentile. The difference between their average scores is roughly 3% in favor of the desktop part, but the pattern of wins is what matters for selection.

Users who prioritize multi-threaded throughput in tasks like data compression, encryption, and prime-number finding should choose the Ryzen 7 3700X. The data shows it leads in those specific workloads by margins from 1.2% up to 32%. Users who prioritize single-thread responsiveness, floating-point math, integer math, and extended instruction workloads should choose the Ryzen 5 8645HS, which leads by margins from 3.8% up to 27.3% in those tests. The 8645HS also holds a slight edge in the Cinebench R15 multicore test, scoring 2094 against 2092, a negligible 0.1% difference.

The 3700X is the stronger choice for a fixed desktop workstation where the motherboard and memory platform are already chosen for AM4. The 8645HS is the stronger choice for a mobile system that needs a high-clocked Zen 4 core with an integrated Radeon 760M GPU, since the 3700X has no integrated graphics listed in the database. The 8645HS is also the only one of the two with a recorded Cinebench R23 result, scoring 13220 multi-core and 1714 single-core, so for users on that benchmark generation, only the mobile part has data.

Where Each One Wins

The Ryzen 7 3700X wins in five recorded tests: PassMark data compression (296379 vs 265483, a 11.6% lead), PassMark data encryption (18900 vs 15588, a 21.2% lead), PassMark find prime numbers (99 vs 75, a 32% lead), PassMark physics (1181 vs 1095, a 7.9% lead), and PassMark random string sorting (32131 vs 31748, a 1.2% lead). These are mostly workloads that scale with core count and cache, which favors the 8-core 3700X with its 32 MB of L3 cache.

The Ryzen 5 8645HS wins in eight recorded tests: Cinebench R15 multi-core (2094 vs 2092, a 0.1% lead), Cinebench R15 single-core (270 vs 204, a 24.4% lead), PassMark extended instructions (20003 vs 19241, a 3.8% lead), PassMark floating-point math (44833 vs 39005, a 13% lead), PassMark integer math (72640 vs 66399, an 8.6% lead), PassMark multithread (22586 vs 22458, a 0.6% lead), and PassMark single-thread (3653 vs 2656, a 27.3% lead). The single-thread advantage is the defining trait of the 8645HS, driven by its higher base clock (4.30 GHz vs 3.60 GHz), higher boost clock (5.00 GHz vs 4.40 GHz), and newer Zen 4 architecture.

For general productivity that is not heavily multi-threaded, the 8645HS wins. For server-like or batch workloads that hammer encryption and compression, the 3700X wins. The 8645HS also wins the only recorded Cinebench R23 test, but there is no R23 score for the 3700X in the database, so that comparison cannot be drawn directly.

Architecture Differences

The two processors come from different generations and are built for different sockets. The Ryzen 7 3700X is Zen 2, codename Matisse, on a 7 nm process from TSMC, with 3,800 million transistors on a 74 mm² die. It uses AMD Socket AM4 and supports DDR4 memory in a dual-channel configuration, with a memory bandwidth of 51.2 GB/s. The Ryzen 5 8645HS is Zen 4, codename Hawk Point, on a 4 nm process from TSMC, with 25,000 million transistors on a 178 mm² die. It uses AMD Socket FP8 and supports DDR5 memory in a dual-channel configuration, with a memory bandwidth of 89.6 GB/s.

The cache layouts differ significantly. The 3700X has 64 KB of L1 per core, 512 KB of L2 per core, and 32 MB of shared L3. The 8645HS also has 64 KB of L1 per core, but it has 1 MB of L2 per core and only 16 MB of shared L3. This means the 3700X has twice the L3 capacity, which likely contributes to its wins in data compression and encryption, while the 8645HS has twice the L2 per core, which may help its single-thread and floating-point workloads.

The 3700X has a 65 W TDP, while the 8645HS has a 45 W TDP. The 3700X has its multiplier unlocked, while the 8645HS is locked. The 3700X supports PCIe Gen 4 with 24 lanes (CPU only), while the 8645HS supports PCIe Gen 4 with 20 lanes (CPU only). The 8645HS has integrated graphics (Radeon 760M), while the 3700X has no integrated graphics listed. The 3700X was released on 2019-07-06, while the 8645HS was released on 2023-12-05. The 3700X has a launch MSRP of $329, while the 8645HS has no launch MSRP field in the database.

FAQ

Q: Which CPU has more cores and threads?

A: The AMD Ryzen 7 3700X has 8 cores and 16 threads. The AMD Ryzen 5 8645HS has 6 cores and 12 threads.

Q: Which CPU is faster in single-threaded performance?

A: The AMD Ryzen 5 8645HS is faster. It scores 3653 in PassMark single-thread versus 2656 for the 3700X, a 27.3% lead. It also scores 270 in Cinebench R15 single-core versus 204, a 24.4% lead.

Q: Which CPU is better for data compression and encryption?

A: The AMD Ryzen 7 3700X wins both tests. It scores 296379 in data compression versus 265483, an 11.6% lead, and 18900 in data encryption versus 15588, a 21.2% lead.

Q: Does the Ryzen 5 8645HS have integrated graphics?

A: Yes, the database lists integrated graphics as Radeon 760M for the 8645HS. The 3700X has no integrated graphics listed.

Q: Which CPU has a newer architecture?

A: The AMD Ryzen 5 8645HS uses Zen 4 (Hawk Point) on a 4 nm process. The AMD Ryzen 7 3700X uses Zen 2 (Matisse) on a 7 nm process.

Q: What memory types do they support?

A: The 3700X supports DDR4 memory, while the 8645HS supports DDR5 memory. Both are dual-channel, but the 8645HS has a higher memory bandwidth of 89.6 GB/s versus 51.2 GB/s.

Head-to-Head Benchmarks

The largest win for the Ryzen 5 8645HS is in PassMark single-thread, where it scores 3653 versus 2656, a 27.3% advantage. The same margin appears in PassMark singlethread, which is the same score recorded twice. The next largest win is in Cinebench R15 single-core, where the 8645HS scores 270 versus 204, a 24.4% lead. These two tests show the massive single-thread improvement of Zen 4 over Zen 2 at similar clock ranges, because the 8645HS has a base clock of 4.30 GHz and a boost clock of 5.00 GHz, compared to 3.60 GHz and 4.40 GHz for the 3700X.

The next biggest win for the 8645HS is in PassMark floating-point math, where it scores 44833 versus 39005, a 13% lead. In PassMark integer math, it scores 72640 versus 66399, an 8.6% lead. In PassMark extended instructions, it scores 20003 versus 19241, a 3.8% lead. In PassMark multithread, it scores 22586 versus 22458, a 0.6% lead. In Cinebench R15 multicore, it scores 2094 versus 2092, a 0.1% lead.

The largest win for the Ryzen 7 3700X is in PassMark find prime numbers, where it scores 99 versus 75, a 32% lead. This is a workload that likely benefits from the 3700X's larger L3 cache and additional two cores. The next largest win is in PassMark data encryption, where it scores 18900 versus 15588, a 21.2% lead. In PassMark data compression, it scores 296379 versus 265483, an 11.6% lead. In PassMark physics, it scores 1181 versus 1095, a 7.9% lead. In PassMark random string sorting, it scores 32131 versus 31748, a 1.2% lead.

The overall win count is 8 for the 8645HS and 5 for the 3700X. However, the average benchmark scores tell a different story: the 3700X has a higher average of 34260, while the 8645HS has 33244. This is because the 3700X wins in tests with very high raw scores (data compression at 296379 and encryption at 18900), which pull its average up despite losing in raw count. The 8645HS wins in tests with lower raw scores but higher percentage margins.

Specification Differences

The two CPUs differ in every major specification category. The 3700X has 8 cores and 16 threads; the 8645HS has 6 cores and 12 threads. The base clock is 3.60 GHz for the 3700X and 4.30 GHz for the 8645HS. The boost clock is 4.40 GHz for the 3700X and 5.00 GHz for the 8645HS. The TDP is 65 W for the 3700X and 45 W for the 8645HS.

The socket is AMD Socket AM4 for the 3700X and AMD Socket FP8 for the 8645HS. The architecture is Zen 2 (Matisse) for the 3700X and Zen 4 (Hawk Point) for the 8645HS. The process node is 7 nm for the 3700X and 4 nm for the 8645HS. The transistor count is 3,800 million for the 3700X and 25,000 million for the 8645HS. The die size is 74 mm² for the 3700X and 178 mm² for the 8645HS.

The L2 cache is 512 KB per core for the 3700X and 1 MB per core for the 8645HS. The L3 cache is 32 MB for the 3700X and 16 MB (shared) for the 8645HS. The memory support is DDR4 for the 3700X and DDR5 for the 8645HS. The memory bandwidth is 51.2 GB/s for the 3700X and 89.6 GB/s for the 8645HS. The PCIe support is Gen 4 with 24 lanes for the 3700X and Gen 4 with 20 lanes for the 8645HS.

The 3700X has no integrated graphics, while the 8645HS has Radeon 760M. The 3700X has an unlocked multiplier, while the 8645HS is locked. The market segment is Desktop for the 3700X and Mobile for the 8645HS. The release dates are 2019-07-06 for the 3700X and 2023-12-05 for the 8645HS. The 3700X has a launch MSRP of $329, while the 8645HS has no such field. The part numbers differ as well: the 3700X is 100-000000071, while the 8645HS has three part numbers listed: 100-000001320 (FP7r2), 100-000001385 (FP7), and 100-000001310 (FP8).