AMD Ryzen 5 40 vs AMD Ryzen 7 9850X3D Comparison

The Verdict

The data shows a decisive split between these two AMD processors, with the Ryzen 7 9850X3D winning all 15 head-to-head benchmark comparisons. The Ryzen 5 40 is a 4-core, 8-thread mobile chip built on Zen 2, while the Ryzen 7 9850X3D is an 8-core, 16-thread desktop part on Zen 5. The Ryzen 7 9850X3D delivers roughly 3.7 times the average benchmark score (58386 versus 15882) and sits in the 92nd percentile of all CPUs, compared to the 70th percentile for the Ryzen 5 40. The Ryzen 7 9850X3D is the clear choice for anyone needing high multi-threaded throughput, large cache capacity, or desktop-class performance. The Ryzen 5 40, with its 15 W TDP and mobile socket, is the appropriate pick for low-power portable systems where energy draw is the priority, not raw speed.

Architecture Differences

The two processors come from different generations and use different process nodes. The Ryzen 5 40 uses the Zen 2 architecture under the Mendocino codename, built on a 6 nm process at TSMC. The Ryzen 7 9850X3D uses Zen 5 under the Granite Ridge codename, fabricated on a 4 nm process, also at TSMC. The Ryzen 7 9850X3D integrates 8,315 million transistors on a 70.6 mm² die, while the Ryzen 5 40 has a 100 mm² die with no transistor count listed in the database.

Cache structures differ substantially. The Ryzen 5 40 has 64 KB of L1 per core, 512 KB of L2 per core, and 4 MB of shared L3. The Ryzen 7 9850X3D has 80 KB of L1 per core, 1 MB of L2 per core, and 96 MB of shared L3. The Ryzen 7 9850X3D therefore carries 24 times the shared L3 of the Ryzen 5 40, a key advantage for workloads that repeatedly access large datasets. No 3D V-Cache field is listed for either part, so the "X3D" naming cannot be attributed to a specific cache-stacking feature in this data.

The Ryzen 5 40 uses LPDDR5 memory over a dual-channel bus with 88.0 GB/s bandwidth. The Ryzen 7 9850X3D uses DDR5 over dual-channel with 89.6 GB/s. The Ryzen 7 9850X3D supports ECC memory while the Ryzen 5 40 does not. PCIe connectivity also differs: the Ryzen 5 40 provides Gen 3 with 4 CPU lanes, while the Ryzen 7 9850X3D provides Gen 5 with 24 CPU lanes. Both have integrated graphics, with the Ryzen 5 40 using Radeon 610M and the Ryzen 7 9850X3D using Radeon Graphics.

The Ryzen 5 40 is a mobile part on AMD Socket FT6, while the Ryzen 7 9850X3D is a desktop part on AMD Socket AM5. The Ryzen 7 9850X3D has an unlocked multiplier; the Ryzen 5 40 does not. The Ryzen 7 9850X3D has a release date of 2026-01-28, with the Ryzen 5 40 released on 2025-09-30. The Ryzen 7 9850X3D has a launch MSRP of $499. The Ryzen 7 9850X3D belongs to the 9000 series, while the Ryzen 5 40 has no series field.

Head-to-Head Benchmarks

The Ryzen 7 9850X3D dominates every recorded test. In Cinebench R23 multi-core, the Ryzen 7 9850X3D scores 22807 against 4841 for the Ryzen 5 40, a delta of -78.8%. In Cinebench R23 single-core, the Ryzen 7 9850X3D scores 2228 against 1150, a delta of -48.4%. The single-core gap is smaller than the multi-core gap, which is consistent with the Ryzen 7 9850X3D having double the cores and threads, but the single-core advantage still reflects the newer Zen 5 architecture and higher clocks.

Cinebench R15 results follow the same pattern. Multi-core shows 3551 for the Ryzen 7 9850X3D versus 790 for the Ryzen 5 40, a delta of -77.8%. Single-core shows 343 versus 165.5, a delta of -51.7%. The R15 single-core deficit of just over half is notable, as it indicates the Ryzen 5 40 is not merely behind in multi-threaded tasks but also substantially slower per thread.

PassMark integer math shows the Ryzen 7 9850X3D at 123140 versus 31598, a delta of -74.3%. Floating point math shows 81998 versus 15194, a delta of -81.5%. Extended instructions show the largest gap among the PassMark tests at -83.6%: 39272 versus 6437. Prime number finding shows the largest overall delta at -95.4%, with 435 versus 20. The Ryzen 7 9850X3D also wins data compression (474501 versus 141533, -70.2%), data encryption (22856 versus 6646, -70.9%), random string sorting (49764 versus 15124, -69.6%), and physics (4171 versus 432, -89.6%). PassMark multi-thread shows 41318 versus 9341, a delta of -77.4%. PassMark single-thread shows 4704 versus 2477, a delta of -47.3%, the smallest performance gap in the entire dataset.

The nearest rival data places the Ryzen 5 40 among server and mobile processors with similar average scores. Its average benchmark score of 15882 sits within 0.4% of the AMD EPYC 75F3 (15859), the AMD EPYC 9354P (15826), and the Intel Core Ultra 5 134U (15910). The Ryzen 7 9850X3D, with an average score of 58386, sits within 0.5% of the Intel Core i9-14900 (58115) and the Intel Xeon w5-2545 (58504). This means the Ryzen 5 40 competes in a completely different performance tier, roughly matching older server chips in aggregate score, while the Ryzen 7 9850X3D trades blows with high-end desktop parts.

The Ryzen 7 9850X3D also shows a much higher percentile ranking at 92 versus 70 for the Ryzen 5 40. That 22-point gap indicates the Ryzen 7 9850X3D outperforms a much larger fraction of the CPUs in the database. The Ryzen 5 40, despite its 70th percentile, is still in the upper half of all recorded CPUs, but it trails the Ryzen 7 9850X3D by a wide margin in every measured category.

Specification Differences

The two processors differ across nearly every specification field. The Ryzen 5 40 uses 4 cores and 8 threads, while the Ryzen 7 9850X3D uses 8 cores and 16 threads. Base clocks are 2.80 GHz for the Ryzen 5 40 and 4.70 GHz for the Ryzen 7 9850X3D. Boost clocks are 4.30 GHz and 5.60 GHz respectively. TDP is 15 W for the Ryzen 5 40 and 120 W for the Ryzen 7 9850X3D. The Ryzen 5 40 has a 6 nm process node, while the Ryzen 7 9850X3D has a 4 nm node. The Ryzen 5 40 has a 100 mm² die; the Ryzen 7 9850X3D has a 70.6 mm² die and 8,315 million transistors.

Cache differs in every level: L1 is 64 KB per core versus 80 KB per core, L2 is 512 KB per core versus 1 MB per core, and L3 is 4 MB shared versus 96 MB shared. Memory support is LPDDR5 for the Ryzen 5 40 and DDR5 for the Ryzen 7 9850X3D, with bandwidth at 88.0 GB/s versus 89.6 GB/s. ECC memory is false for the Ryzen 5 40 and true for the Ryzen 7 9850X3D. PCIe is Gen 3 with 4 lanes versus Gen 5 with 24 lanes. Integrated graphics are Radeon 610M versus Radeon Graphics. The market segment is Mobile versus Desktop. Sockets are AMD Socket FT6 versus AMD Socket AM5. The multiplier is locked on the Ryzen 5 40 and unlocked on the Ryzen 7 9850X3D. The part number for the Ryzen 7 9850X3D is 100-000001973; the Ryzen 5 40 has an unknown part number. Release dates are 2025-09-30 for the Ryzen 5 40 and 2026-01-28 for the Ryzen 7 9850X3D.

FAQ

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

A: The Ryzen 7 9850X3D wins every multi-core test. In Cinebench R23 multi-core, it scores 22807 versus 4841 for the Ryzen 5 40, a delta of -78.8%. PassMark multi-thread shows 41318 versus 9341, a delta of -77.4%.

Q: How large is the single-thread performance gap?

A: The Ryzen 7 9850X3D leads in single-thread tests but by a smaller margin than multi-thread tests. PassMark single-thread shows 4704 versus 2477, a delta of -47.3%. Cinebench R23 single-core shows 2228 versus 1150, a delta of -48.4%.

Q: What are the core and thread counts for each processor?

A: The Ryzen 5 40 has 4 cores and 8 threads. The Ryzen 7 9850X3D has 8 cores and 16 threads.

Q: How much L3 cache does each processor have?

A: The Ryzen 5 40 has 4 MB of shared L3 cache. The Ryzen 7 9850X3D has 96 MB of shared L3 cache, which is 24 times larger.

Q: Which processor supports ECC memory?

A: The Ryzen 7 9850X3D supports ECC memory. The Ryzen 5 40 does not support ECC memory.

Q: What is the TDP of each processor?

A: The Ryzen 5 40 has a TDP of 15 W. The Ryzen 7 9850X3D has a TDP of 120 W. The Ryzen 5 40 is a mobile part, while the Ryzen 7 9850X3D is a desktop part.

Q: How do the two processors compare in average benchmark score?

A: The Ryzen 7 9850X3D has an average benchmark score of 58386, which is about 3.7 times the 15882 average score of the Ryzen 5 40. The Ryzen 7 9850X3D ranks in the 92nd percentile of all CPUs, while the Ryzen 5 40 ranks in the 70th percentile.