AMD Ryzen 7 9800X3D vs AMD Ryzen 9 7940H Comparison

The Verdict

The data presents a clear split between two very different AMD processors. The AMD Ryzen 9 7940H and the AMD Ryzen 7 9800X3D share the same core and thread counts, but their benchmark profiles could not be more distinct. The Ryzen 9 7940H wins 3 of the 15 head-to-head comparisons, while the Ryzen 7 9800X3D takes 12. However, the nature of those wins matters more than the raw count.

For users prioritizing single-core responsiveness in legacy or lightly threaded workloads, the Ryzen 9 7940H is the stronger choice. It leads by 67.6% in Cinebench R23 single-core and by 7% in Cinebench R15 single-core. Its Cinebench R23 multi-core score of 24703 also beats the 9800X3D's 23230, a 6.3% advantage. These results suggest the mobile chip holds its own in CPU rendering tasks that scale across all 16 threads.

The Ryzen 7 9800X3D dominates everywhere else. It wins PassMark's multi-thread test with a score of 40009 versus 29063, a 27.4% gap. It also excels in physics simulation, scoring 4083 against 1300, a massive 68.2% difference. Its 96 MB of shared L3 cache appears to drive substantial gains in data compression, extended instructions, and prime number finding. Anyone running heavily threaded productivity, scientific, or content creation workloads should favor the 9800X3D based on the recorded data.

The 7940H is a mobile processor with a 35 W TDP, while the 9800X3D is a desktop part with a 120 W TDP. The 9800X3D's launch MSRP is $479. The 7940H has no listed launch MSRP in the database. The 9800X3D is the clear performance winner in most metrics, but the 7940H's lower power envelope and competitive rendering scores make it a viable option for portable systems where energy efficiency matters more than raw throughput.

Where Each One Wins

The Ryzen 9 7940H wins in Cinebench R15 single-core, Cinebench R23 single-core, and Cinebench R23 multi-core. Its single-core wins are particularly striking. The 67.6% lead in R23 single-core suggests the Zen 4 architecture in this mobile part clocks or boosts more effectively in short, single-threaded bursts compared to the 9800X3D's configuration. The 6.3% multi-core win in R23 shows that for render workloads measured by this specific benchmark, the 7940H can outperform the desktop chip despite its far lower TDP.

The Ryzen 7 9800X3D wins in Cinebench R15 multi-core by 31.7%, and in every PassMark test included in the comparison. Its largest margins come in find prime numbers (80.9% ahead), physics (68.2% ahead), and extended instructions (30.9% ahead). Data compression shows a 24.8% lead, floating point math a 21.9% lead, and integer math a 12.6% lead. The 9800X3D also leads in single-thread PassMark by 10.8%, a notable reversal given the 7940H's single-core Cinebench victories. The 9800X3D's 96 MB L3 cache likely explains these consistent wins in cache-sensitive workloads.

The practical split is straightforward: the 7940H for Cinebench-style rendering and single-threaded legacy tests, the 9800X3D for everything else in the PassMark suite and for R15 multi-core. The 9800X3D's physics score of 4083 versus 1300 suggests a major advantage in simulation and gaming physics workloads.

Architecture Differences

The two processors come from different generations and target different platforms. The Ryzen 9 7940H is a 7000 series mobile chip built on Zen 4 architecture with the codename Phoenix. The Ryzen 7 9800X3D is a 9000 series desktop chip built on Zen 5 architecture with the codename Granite Ridge. Both use a 4 nm process from TSMC, but their physical designs differ substantially.

The 7940H has 25,000 million transistors on a 178 mm² die. The 9800X3D has 8,315 million transistors on a 70.6 mm² die. Despite the larger transistor count, the 7940H's cache configuration is much smaller: 64 KB of L1 per core, 1 MB of L2 per core, and 16 MB of shared L3. The 9800X3D offers 80 KB of L1 per core, 1 MB of L2 per core, and 96 MB of shared L3. That 80 MB difference in L3 is the defining architectural gap, explaining many of the benchmark deltas.

The 7940H uses AMD Socket FP8, while the 9800X3D uses AMD Socket AM5. The mobile part has a base clock of 4.00 GHz and a boost clock of 5.20 GHz. The desktop part has a base clock of 4.70 GHz and the same 5.20 GHz boost. The 9800X3D has an unlocked multiplier, while the 7940H does not. The 7940H includes Radeon 780M integrated graphics, while the 9800X3D has a more basic Radeon Graphics solution. Both support DDR5 memory with dual-channel buses and 89.6 GB/s bandwidth, and both support ECC memory. The PCIe interface differs: Gen 4 with 20 lanes on the 7940H versus Gen 5 with 24 lanes on the 9800X3D. The 9800X3D was released on 2024-11-06, while the 7940H has no release date in the database.

FAQ

Q: Which processor is faster in single-core Cinebench tests?

A: The Ryzen 9 7940H wins both Cinebench single-core tests. It leads by 7% in R15 single-core (351 versus 328) and by 67.6% in R23 single-core (3487 versus 2080).

Q: Does the Ryzen 7 9800X3D win in multi-core rendering?

A: It depends on the benchmark. The 9800X3D wins Cinebench R15 multi-core by 31.7% (3647 versus 2490), but the 7940H wins Cinebench R23 multi-core by 6.3% (24703 versus 23230).

Q: What is the biggest performance gap between the two?

A: The largest delta is in PassMark find prime numbers, where the 9800X3D scores 423 versus the 7940H's 81, an 80.9% advantage for the desktop chip.

Q: How do their cache sizes compare?

A: The 7940H has 16 MB of shared L3 and 64 KB of L1 per core. The 9800X3D has 96 MB of shared L3 and 80 KB of L1 per core. Both have 1 MB of L2 per core.

Q: Which processor is designed for mobile use?

A: The Ryzen 9 7940H is a mobile processor with a 35 W TDP and AMD Socket FP8. The Ryzen 7 9800X3D is a desktop processor with a 120 W TDP and AMD Socket AM5.

Q: Do both processors support ECC memory?

A: Yes, both support ECC memory and both use dual-channel DDR5 with 89.6 GB/s bandwidth.

Head-to-Head Benchmarks

The head-to-head data shows a lopsided contest in favor of the Ryzen 7 9800X3D, but the 7940H's wins are concentrated in areas that matter for specific users. Starting with the 7940H's victories: Cinebench R15 single-core shows 351 versus 328, a 7% lead. Cinebench R23 single-core shows 3487 versus 2080, a 67.6% lead. Cinebench R23 multi-core shows 24703 versus 23230, a 6.3% lead. These are not marginal differences in the single-core cases. The R23 single-core result is the single largest win for the 7940H and indicates a fundamental advantage in how this mobile chip handles single-threaded bursts.

The 9800X3D's wins are broader and often larger. In Cinebench R15 multi-core, it scores 3647 against 2490, a 31.7% margin. PassMark data compression shows 468017 versus 352077, a 24.8% lead. Data encryption is closer: 22158 versus 21096, only 4.8% ahead. Extended instructions show 38808 versus 26804, a 30.9% gap. The find prime numbers test is the most extreme: 423 versus 81, an 80.9% blowout. Floating point math favors the 9800X3D by 21.9% (79456 versus 62057). Integer math favors it by 12.6% (116709 versus 101977). PassMark multi-thread shows 40009 versus 29063, a 27.4% margin. Physics shows 4083 versus 1300, a 68.2% gap. Random string sorting favors the 9800X3D by 13.3% (48526 versus 42093). PassMark single-thread shows 4430 versus 3952, a 10.8% lead.

The overall average benchmark scores tell a nuanced story. The 7940H has an average benchmark score of 40431 and sits at the 87th percentile. The 9800X3D has an average benchmark score of 39768 and also sits at the 87th percentile. Despite the 9800X3D winning 12 of 15 head-to-head tests, its average score is actually lower than the 7940H's by 663 points. This is because the 7940H's Cinebench R23 multi-core win and its massive single-core Cinebench victories offset some of the 9800X3D's PassMark dominance in the averaging calculation. The nearest rivals for the 7940H include the Intel Core i9-13905H with a delta of 0.3% and the Intel Core Ultra X7 368H with a delta of -0.2%. The 9800X3D's nearest rivals are all AMD parts, including the Ryzen 7 7700 with a delta of -0.8% and the Ryzen AI 9 365 with a delta of -0.7%.

Specification Differences

The two processors differ in nearly every physical and platform specification. The 7940H is a 7000 series mobile chip with a 35 W TDP, while the 9800X3D is a 9000 series desktop chip with a 120 W TDP. The base clocks differ: 4.00 GHz for the 7940H versus 4.70 GHz for the 9800X3D. Both boost to 5.20 GHz. The 7940H uses AMD Socket FP8; the 9800X3D uses AMD Socket AM5. The 7940H is built on Zen 4 with the codename Phoenix; the 9800X3D is built on Zen 5 with the codename Granite Ridge.

The transistor counts and die sizes are markedly different. The 7940H packs 25,000 million transistors into a 178 mm² die. The 9800X3D uses 8,315 million transistors on a 70.6 mm² die. Cache configurations diverge significantly: the 7940H has 64 KB of L1 per core and 16 MB of shared L3, while the 9800X3D has 80 KB of L1 per core and 96 MB of shared L3. Both have 1 MB of L2 per core.

The PCIe capabilities differ, with the 7940H offering Gen 4 across 20 lanes and the 9800X3D offering Gen 5 across 24 lanes. The integrated graphics differ: Radeon 780M on the 7940H versus Radeon Graphics on the 9800X3D. The 9800X3D has an unlocked multiplier; the 7940H does not. The 9800X3D has a release date of 2024-11-06 and a launch MSRP of $479; the 7940H has neither a release date nor a launch MSRP in the database. The 9800X3D's part number is 100-000001084, while the 7940H has multiple part numbers across FP7r2, FP7, and FP8 sockets. Both support DDR5 with dual-channel memory buses, 89.6 GB/s bandwidth, and ECC memory.