AMD Ryzen 7 3800X vs AMD Ryzen 7 7840HS Comparison

Head-to-Head Benchmarks

The benchmark data shows a clear split between the two processors. The AMD Ryzen 7 7840HS wins 13 of the 17 recorded head-to-head comparisons, while the AMD Ryzen 7 3800X takes 4. The margins, however, vary dramatically by workload type.

The 7840HS dominates in raw compute throughput. Its passmark floating point math score of 59921 beats the 3800X's 39759 by 50.7%, the largest single delta in the comparison. Integer math follows the same pattern: 98682 versus 67725, a 45.7% advantage. Extended instructions show a 28.5% lead (25747 versus 20037). These results indicate the Zen 4 architecture in the mobile chip delivers substantially higher per-clock execution efficiency.

Multithreaded performance in passmark favors the 7840HS by 24.2% (28633 versus 23046), and the geekbench multicore score shows a 25.4% advantage (11846 versus 9446). The 7840HS also wins passmark random string sorting by 22.8% (40364 versus 32869) and data compression by 13.3% (345536 versus 304853). Data encryption is closer, with the 7840HS ahead by 6.7% (20627 versus 19337).

The 3800X fights back in cinebench tests. Its cinebench r23 multicore score of 19588 beats the 7840HS's 15102 by 22.9%. The single-core cinebench r23 result is even more lopsided: 2765 versus 1761, a 36.3% advantage for the older desktop chip. Cinebench r15 tells a different story: the 7840HS wins multicore by 12.6% (2222.84 versus 1974), while the 3800X edges single-core by 1.4% (278 versus 274).

Passmark single-thread results strongly favor the 7840HS: 3753 versus 2712, a 38.4% lead. The 3800X only wins passmark find prime numbers (103 versus 88, a 14.6% advantage) and the two cinebench r23 tests. The 7840HS also wins passmark physics by 12.2% (1376 versus 1226).

The overall database average benchmark scores place the 7840HS at 29955 and the 3800X at 29447, a modest 1.7% gap. Both sit at the 81st percentile among all CPUs. The 7840HS's nearest rivals include the AMD Ryzen 7 8845HS with an identical 29955 average, the Ryzen 7 5800XT at 29879 (0.3% behind), and the Ryzen 7 7840H at 29868 (0.3% behind). The 3800X's nearest rivals include the AMD Ryzen AI 7 345 at 29461, the AMD EPYC 9654 at 29409 (0.1% behind), and the Intel Core i5-13500HX at 29270 (0.6% behind).

The Verdict

The data supports a straightforward conclusion: pick the Ryzen 7 7840HS for general productivity, integer and floating-point workloads, encryption, compression, and single-threaded responsiveness. Pick the Ryzen 7 3800X for cinebench-style rendering workloads, specifically the r23 multicore and single-core tests, and for prime number calculations.

The 7840HS wins the majority of head-to-head tests by wide margins, especially in passmark math operations where it leads by 45.7% to 50.7%. Its passmark single-thread score is 38.4% higher, which translates to snappier application behavior in lightly threaded tasks. The geekbench results reinforce this, with a 21.3% single-core and 25.4% multicore advantage.

The 3800X's cinebench r23 wins are notable but isolated. Its 22.9% multicore and 36.3% single-core leads suggest it has a specific strength in that benchmark's workload, likely related to sustained power delivery on desktop cooling. The 3800X also wins the prime number search test by 14.6%, indicating an advantage in that particular algorithmic pattern.

For users comparing these two, the 7840HS is the better all-rounder in the recorded data. The 3800X remains competitive in rendering-specific scenarios but falls behind in the broader benchmark suite. The 3800X requires a platform with higher power delivery (105W TDP versus 35W), while the 7840HS delivers superior performance in most metrics within a mobile power envelope.

Architecture Differences

The two processors come from different generations and manufacturing processes. The 7840HS uses Zen 4 architecture on TSMC's 4 nm node, while the 3800X uses Zen 2 on TSMC's 7 nm node. The 7840HS codename is Phoenix, part of the 7000 series. The 3800X codename is Matisse, part of the 3000 series.

Both have 8 cores and 16 threads. The 7840HS has a base clock of 3.80 GHz and boost clock of 5.10 GHz. The 3800X has a base clock of 3.90 GHz and boost clock of 4.50 GHz. The 7840HS runs at a lower base clock but achieves a higher boost clock.

Cache configurations differ. The 7840HS has 64 KB L1 per core, 1 MB L2 per core, and 16 MB shared L3. The 3800X has 64 KB L1 per core, 512 KB L2 per core, and 32 MB L3. The 3800X has double the L3 cache, which likely contributes to its cinebench r23 performance.

The 7840HS uses DDR5 memory with dual-channel support and 89.6 GB/s bandwidth. The 3800X uses DDR4 with dual-channel support and 51.2 GB/s bandwidth. The 7840HS supports ECC memory; the 3800X does not. The 7840HS has integrated Radeon 780M graphics; the 3800X has no integrated graphics.

The 7840HS uses AMD Socket FP8 and has 20 PCIe Gen 4 lanes. The 3800X uses AMD Socket AM4 and has 24 PCIe Gen 4 lanes. The 7840HS has an unlocked multiplier locked, the 3800X has an unlocked multiplier. The 7840HS transistor count is 25,000 million on a 178 mm² die. The 3800X has 3,800 million transistors on a 74 mm² die. The 7840HS is a mobile processor; the 3800X is a desktop processor.

FAQ

Q: Which processor has the higher boost clock?

A: The AMD Ryzen 7 7840HS boosts to 5.10 GHz, while the AMD Ryzen 7 3800X boosts to 4.50 GHz.

Q: How much faster is the 7840HS in floating-point math?

A: The 7840HS scores 59921 in passmark floating point math, which is 50.7% ahead of the 3800X's 39759.

Q: Does the 3800X win any benchmarks?

A: Yes, the 3800X wins cinebench r23 multicore by 22.9%, cinebench r23 single-core by 36.3%, cinebench r15 single-core by 1.4%, and passmark find prime numbers by 14.6%.

Q: What memory types do these processors support?

A: The 7840HS supports DDR5 with 89.6 GB/s bandwidth, while the 3800X supports DDR4 with 51.2 GB/s bandwidth. Both use dual-channel memory buses.

Q: Which processor has integrated graphics?

A: The 7840HS includes Radeon 780M integrated graphics. The 3800X has no integrated graphics.

Q: What is the L3 cache difference?

A: The 7840HS has 16 MB shared L3 cache, while the 3800X has 32 MB L3 cache.

Where Each One Wins

The 7840HS wins in most productivity and compute scenarios. Its passmark integer math score of 98682 is 45.7% higher, making it the clear choice for arithmetic-heavy applications. Floating-point workloads also favor it by 50.7%. Data compression and encryption workloads see 13.3% and 6.7% advantages respectively. The 38.4% higher passmark single-thread score indicates faster response in everyday tasks. The geekbench multicore advantage of 25.4% suggests strong performance in parallel applications like video editing and 3D modeling. Its passmark multithread score of 28633 is 24.2% higher, reinforcing this conclusion.

The 3800X wins in cinebench r23 rendering workloads. Its multicore score of 19588 is 22.9% higher, and its single-core score of 2765 is 36.3% higher. This suggests it excels in sustained CPU-bound rendering tasks where power delivery is not constrained. The 3800X also wins the prime number search test by 14.6%, indicating an edge in that specific mathematical operation. Its cinebench r15 single-core win is marginal at 1.4%.

The 3800X's 32 MB L3 cache likely contributes to its rendering performance, while the 7840HS's higher boost clock and newer architecture drive its broader wins. The 7840HS also wins passmark physics by 12.2% and random string sorting by 22.8%, covering simulation and sorting workloads.

Specification Differences

The two processors differ in the following recorded specifications:

• Process node: 4 nm (7840HS) versus 7 nm (3800X)
• Base clock: 3.80 GHz (7840HS) versus 3.90 GHz (3800X)
• Boost clock: 5.10 GHz (7840HS) versus 4.50 GHz (3800X)
• TDP: 35W (7840HS) versus 105W (3800X)
• Socket: AMD Socket FP8 (7840HS) versus AMD Socket AM4 (3800X)
• Architecture: Zen 4 (7840HS) versus Zen 2 (3800X)
• Codename: Phoenix (7840HS) versus Matisse (3800X)
• Transistors: 25,000 million (7840HS) versus 3,800 million (3800X)
• Die size: 178 mm² (7840HS) versus 74 mm² (3800X)
• L2 cache: 1 MB per core (7840HS) versus 512 KB per core (3800X)
• L3 cache: 16 MB shared (7840HS) versus 32 MB (3800X)
• Memory support: DDR5 (7840HS) versus DDR4 (3800X)
• Memory bandwidth: 89.6 GB/s (7840HS) versus 51.2 GB/s (3800X)
• ECC memory: Supported (7840HS) versus not supported (3800X)
• PCIe lanes: 20 Gen 4 (7840HS) versus 24 Gen 4 (3800X)
• Integrated graphics: Radeon 780M (7840HS) versus none (3800X)
• Market segment: Mobile (7840HS) versus Desktop (3800X)
• Multiplier unlocked: No (7840HS) versus Yes (3800X)