AMD Radeon RX 6850M XT vs NVIDIA GeForce RTX 4090 Comparison

Where Each One Wins

The benchmark data splits cleanly between these two mobile-class graphics processors. The NVIDIA GeForce RTX 4090 wins every recorded head-to-head benchmark, and by a decisive margin. The AMD Radeon RX 6850M XT does not claim a single victory in any shared test, which makes the use-case picture unusually one-sided.

For pure 3D rendering workloads, the RTX 4090 dominates. In 3DMark Steel Nomad DX12, the NVIDIA part scores 9223 against the AMD part's 2257, a 75.5% deficit for the Radeon. This is a synthetic DirectX 12 test that stresses modern rendering pipelines, and the gap is large enough that the RTX 4090 sits in a different performance class entirely. Any workload that resembles this test, meaning modern DX12 gaming or real-time 3D rendering, belongs to the NVIDIA GPU.

Compute-oriented tasks show the same direction but with a slightly narrower spread. In Geekbench OpenCL, the RTX 4090 records 255416 points versus 85040 for the RX 6850M XT, a 66.7% gap. The Vulkan test narrows it a little further: the RTX 4090 posts 271631 against 99483, which is a 63.4% deficit. OpenCL and Vulkan are both cross-vendor APIs, so these results indicate that the NVIDIA architecture scales better regardless of which compute front-end the application chooses.

The average benchmark score in the database reinforces the split. The RX 6850M XT holds an average of 78940 across all recorded tests, while the RTX 4090 averages 60347. That is a curious inversion, because the RTX 4090 wins every head-to-head test yet has a lower overall average. The explanation lies in the benchmark mix: the RTX 4090's record includes several Passmark DX9, DX10, and DX11 tests with relatively low scores, which drag down its mean. The RX 6850M XT has fewer recorded tests, all of them modern API workloads, so its average is not penalized by legacy DX9-era results.

The percentile rankings tell a similar story. The RX 6850M XT sits at the 92nd percentile among all GPUs in the database, while the RTX 4090 sits at the 88th percentile. Again, the RTX 4090's inclusion of older DirectX tests in its benchmark set lowers its percentile despite its clearly superior modern performance. In the tests both GPUs actually share, the RTX 4090 is the unambiguous winner.

Architecture Differences

The two GPUs come from different architectural generations and different process nodes. The AMD Radeon RX 6850M XT uses the Navi 22 chip built on RDNA 2.0, fabricated on TSMC's 7 nm process. The NVIDIA GeForce RTX 4090 uses the AD102 chip built on Ada Lovelace, fabricated on TSMC's 5 nm process. The node shrink gives NVIDIA a density advantage that shows up across the entire specification sheet.

Transistor counts differ enormously. The RX 6850M XT packs 17,200 million transistors into a 335 mm² die, for a density of 51.3 million transistors per square millimeter. The RTX 4090 houses 76,300 million transistors in a 609 mm² die, reaching 125.3 million per square millimeter. That is roughly 4.4 times as many transistors in a die that is not twice the area, which explains why NVIDIA can field far more shader units, texture units, and ray tracing hardware.

Memory subsystems diverge in capacity, type, and bandwidth. The AMD part offers 12 GB of GDDR6 on a 192-bit bus, delivering 432.0 GB/s. The RTX 4090 doubles capacity to 24 GB of GDDR6X on a 384-bit bus, with 1.01 TB/s of bandwidth. The bandwidth gap is about 2.3 times in NVIDIA's favor, which matters for high-resolution textures and compute workloads that stream large data sets.

Compute unit counts scale with the die size difference. The RX 6850M XT has 2560 shading units, 160 texture mapping units, 64 ROPs, and 40 ray tracing cores. The RTX 4090 has 16384 shading units, 512 TMUs, 176 ROPs, and 128 ray tracing cores. NVIDIA also adds 512 tensor cores, a feature class the AMD part lacks entirely. The FP32 throughput tells the same story: 13.21 TFLOPS for AMD versus 82.58 TFLOPS for NVIDIA, a 6.25 times gap. FP16 performance is 26.43 TFLOPS for the Radeon (at a 2:1 ratio) versus 82.58 TFLOPS for the RTX 4090 (at 1:1, so FP16 runs at full FP32 rate).

Clock behavior differs too. The RX 6850M XT runs a base clock of 2321 MHz, a game clock of 2463 MHz, and a boost clock of 2581 MHz. The RTX 4090 has a lower base of 2235 MHz and a boost of 2520 MHz. The AMD chip clocks higher at the margin, but the NVIDIA part's massive execution resource pool more than compensates. The RTX 4090 also runs its memory at 21 Gbps effective versus 18 Gbps effective for the Radeon.

Power and physical design separate the two sharply. The RX 6850M XT is an IGP-class part with a 165 W TDP, no power connectors, and portable-device-dependent display outputs. The RTX 4090 is a triple-slot card drawing 450 W, requiring a 1x 16-pin connector and an 850 W suggested PSU. It measures 304 mm by 137 mm by 61 mm. The AMD GPU is designed for integrated mobile systems; the NVIDIA GPU is a discrete expansion card, and the form factor difference is as large as the performance difference.

Head-to-Head Benchmarks

Three shared benchmarks appear in the database, and the RTX 4090 wins all three with margins between 63% and 76%.

The largest gap is in 3DMark Steel Nomad DX12. The RTX 4090 scores 9223 against 2257 for the RX 6850M XT. The delta is 75.5% in NVIDIA's favor, meaning the Radeon delivers less than a quarter of the RTX 4090's score in this test. Steel Nomad is a demanding DX12 workload that stresses geometry, shading, and memory bandwidth together, so the combined effects of NVIDIA's higher shader count, larger bandwidth, and 24 GB frame buffer show up here in full force.

Geekbench OpenCL shows a 66.7% delta. The RTX 4090 records 255416, while the RX 6850M XT manages 85040. OpenCL is a general-purpose compute API used across scientific, rendering, and machine learning applications. The score difference indicates that the RTX 4090's 512 tensor cores and far higher FP32 throughput translate directly into compute performance. The Radeon's 13.21 TFLOPS is simply outmatched by 82.58 TFLOPS.

Geekbench Vulkan narrows the gap slightly but still favors NVIDIA heavily. The RTX 4090 posts 271631 versus 99483 for AMD, a 63.4% delta. Vulkan is a lower-level API that can expose GPU efficiency differences more directly than OpenCL. The fact that the margin shrinks from OpenCL to Vulkan suggests the AMD architecture performs relatively better when software overhead is reduced, but the absolute gap remains enormous.

The RTX 4090's individual benchmark record adds context. Its Passmark scores include 38194 in G3D, 26613 in GPU compute, 1299 in G2D, and a spread of legacy DX tests from 150 to 397. The RX 6850M XT has no Passmark entries in the database, only the three modern API tests. This explains why the RTX 4090's average score of 60347 is lower than the Radeon's 78940 despite winning every shared test: legacy DX9 through DX12 Passmark tests pull the NVIDIA average down, while the AMD GPU's average is computed only from modern workloads.

Nearest rival data in the database adds another layer. The RX 6850M XT's closest competitors include the NVIDIA Tesla P100 PCIe variants (0.6% and 0.8% deltas), the RTX 5090 at 1.1%, and the RTX 5090 D at 1.6%. The RTX 4090's nearest rivals include the Intel Arc Pro A60 (0% delta), the AMD Radeon Pro Vega 48 (0.3%), the AMD Radeon Pro W6600M (2.5%), and the AMD Radeon PRO V710 (2.9%). The two GPUs compete in very different leagues despite both being labeled high-end mobile parts.

FAQ

Q: Which GPU wins in DirectX 12 gaming performance?

A: The NVIDIA GeForce RTX 4090 wins decisively. In 3DMark Steel Nomad DX12, it scores 9223 versus 2257 for the AMD Radeon RX 6850M XT, a 75.5% margin.

Q: How big is the compute performance gap?

A: In Geekbench OpenCL, the RTX 4090 scores 255416 against 85040 for the RX 6850M XT, a 66.7% gap. In Geekbench Vulkan, the RTX 4090 scores 271631 against 99483, a 63.4% gap.

Q: Why does the RX 6850M XT have a higher average benchmark score than the RTX 4090?

A: The RX 6850M XT averages 78940 across its recorded tests, while the RTX 4090 averages 60347. The RTX 4090's benchmark set includes several legacy Passmark DirectX 9, 10, and 11 tests with low scores, which lower its average despite winning every shared modern test.

Q: Which GPU has more memory bandwidth?

A: The RTX 4090 has 1.01 TB/s of bandwidth from 24 GB of GDDR6X on a 384-bit bus. The RX 6850M XT has 432.0 GB/s from 12 GB of GDDR6 on a 192-bit bus.

Q: Do both GPUs support the same graphics APIs?

A: Yes. Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4 per the database records.

Q: What is the power draw difference?

A: The RX 6850M XT has a 165 W TDP and is an IGP-class part with no power connectors. The RTX 4090 has a 450 W TDP, requires a 1x 16-pin connector, and needs an 850 W suggested PSU.

The Verdict

The data supports only one conclusion for performance: the NVIDIA GeForce RTX 4090 is the superior GPU in every shared benchmark. It wins 3DMark Steel Nomad DX12 by 75.5%, Geekbench OpenCL by 66.7%, and Geekbench Vulkan by 63.4%. No recorded test favors the AMD Radeon RX 6850M XT. Anyone whose priority is raw performance in modern DX12, OpenCL, or Vulkan workloads should select the RTX 4090 without hesitation.

The RTX 4090 also carries double the memory capacity at 24 GB versus 12 GB, more than double the bandwidth at 1.01 TB/s versus 432.0 GB/s, and roughly 6.25 times the FP32 throughput at 82.58 TFLOPS versus 13.21 TFLOPS. It adds 512 tensor cores when tensor cores are needed and scales its pixel rate to 443.5 GPixel/s versus 165. However, these advantages come with a cost in power and form factor: 450 W TDP, triple-slot footprint, 850 W suggested PSU, and physical dimensions of 304 mm by 137 mm by 61 mm.

The RX 6850M XT launch MSRP is 1,599 USD for the RTX 4090, which the database records as the launch MSRP. The AMD part suits a different kind of system entirely: 165 W TDP, IGP form factor, portable device dependent display output, and no power connectors. If the requirement is a compact integrated design that fits in portable chassis constraints, the RX 6850M XT is the only one of the two that qualifies. But within that constraint, it delivers a 92nd percentile ranking among all GPUs and a 78940 average score. The RTX 4090 sits at the 88th percentile with a 60347 average, a ranking that reflects its legacy test load rather than its modern performance.

Nearest rival data confirms the two GPUs target different markets. The RX 6850M XT competes with Tesla P100 variants, the RTX 5090, and the RTX 5090 D, all within a 1.6% band. The RTX 4090's rivals are the Arc Pro A60, Radeon Pro Vega 48, Radeon Pro W6600M, and Radeon PRO V710, a group that includes prosumer and workstation cards. The AMD GPU is a modern mobile-first design; the NVIDIA GPU is a desktop-class card in a mobile chassis class by name only.

For gamers, creators, compute users, or anyone running modern APIs, the RTX 4090 is the clear pick from the recorded data. For compact integrated systems where the GPU must live inside the chassis with no power connectors, the RX 6850M XT is the option that exists at all. The verdict splits on use case, but only because the form factor dictates the choice. On pure performance, there is no contest.

Specification Differences

The database records the following specification differences between the AMD Radeon RX 6850M XT and the NVIDIA GeForce RTX 4090:

The RTX 4090 launches at 1,599 USD MSRP, while the RX 6850M XT has no launch MSRP record in the database.

The RTX 4090 uses 5 nm process node, while the RX 6850M XT uses 7 nm process.

The RTX 4090 has 76,300 million transistors, the RX 6850M XT has 17,200 million transistors.

The RTX 4090 die size measures 609 mm², the RX 6850M XT die size is 335 mm².

The RX 6850M XT has 2560 shading units, the RTX 4090 has 16384 shading units.

The RX 6850M XT offers 160 TMUs, the RTX 4090 has 512 TMUs.

The RX 6850M XT has 64 ROPs, the RTX 4090 has 176 ROPs.

The RX 6850M XT features 40 ray tracing cores, the RTX 4090 has 128 ray tracing cores.

The RX 6850M XT has no tensor cores, the RTX 4090 has 512 tensor cores.

The RX 6850M XT pixel rate is 165.2 GPixel/s, the RTX 4090 pixel rate is 443.5 GPixel/s.

The RX 6850M XT texture rate is 413.0 GTexel/s, the RTX 4090 texture rate is 1,290.2 GTexel/s.

The RX 6850M XT fp32 throughput is 13.21 TFLOPS, the RTX 4090 fp32 throughput is 82.58 TFLOPS.

The RX 6850M XT fp16 throughput is 26.43 TFLOPS (2:1 ratio), the RTX 4090 fp16 throughput is 82.43 TFLOPS (1:1 ratio).

The RX 6850M XT TDP is 165 W, the RTX 4090 TDP is 450 W.

The RX 6850M XT slot width is IGP, the RTX 4090 slot width is triple-slot.

The RX 6850M XT power connectors are None, the RTX 4090 power connectors are 1x 16-pin, with an 850 W suggested PSU.

The RX 6850M XT memory capacity is 12 GB DDR6 GDDR6 memory size, the RTX 4090 memory capacity is 24 GB GDDR6X memory size.

The RX 6850M XT memory bus width is 192 bit, the RTX 4090 memory bus width is 384 bit.

The RX 6850M XT memory bandwidth is 432.0 GB/s, the RTX 4090 memory bandwidth is 1.01 TB/s.

The RX 6850M XT display outputs are Portable Device Dependent, the RTX 4090 display outputs are 1x HDMI 2.13x DisplayPort 1.4a, with PCIe 4.0 x16 bus interface for both.

The RTX 6850M XT release date is 2022-01-03, the RTX 4090 release date 2022-09-19, with the RX 4090 predecessor listed as GeForce 30 and successor GeForce 50.