AMD Radeon RX 6800M vs NVIDIA RTX A4000 Comparison

The benchmark data is unambiguous: the NVIDIA RTX A4000 wins all ten head-to-head tests against the AMD Radeon RX 6800M, with victory margins ranging from a narrow 9.7% to a commanding 48.4%. Despite the AMD card holding a slightly higher percentile ranking among all GPUs (74th vs. 72nd), the RTX A4000’s average benchmark score of 26,683 trails the RX 6800M’s 28,874, a paradox explained by the AMD card’s stronger showing in non-overlapping tests like Geekbench Metal and PassMark G3D. The data consistently favors the NVIDIA card for raw compute and API-specific workloads, while the AMD card’s edge is confined to its higher overall percentile placement rather than any direct comparison victory.

Where Each One Wins

The RTX A4000 dominates every shared benchmark, but the size of its wins reveals where it is truly exceptional. Its largest advantage comes in PassMark GPU Compute, where it scores 9,760 against the RX 6800M’s 5,032—a 48.4% lead. This is a decisive margin for compute-heavy tasks, suggesting the NVIDIA card is the stronger choice for rendering, simulation, or any workload that leverages general-purpose GPU processing. The second-largest gap is in PassMark G2D, where the RTX A4000’s 1,024 score eclipses the AMD’s 538 by 47.5%, indicating superior 2D graphics performance, likely beneficial for multi-monitor setups or desktop compositing.

The RTX A4000 also wins decisively in legacy DirectX 9 workloads, scoring 240 versus 147 (a 38.7% lead), and in Vulkan, scoring 127,645 versus 94,766 (25.8% ahead). These are not marginal differences; they represent substantial performance advantages in both older and modern graphics APIs. The narrower wins are still meaningful: PassMark DirectX 12 shows only a 9.7% gap (72 vs. 65), and 3DMark Steel Nomad DX12 shows a 14.1% gap (2,604 vs. 2,238). The RX 6800M’s only claim to a win is its 74th percentile ranking versus the RTX A4000’s 72nd, a statistical artifact of its higher average across all benchmarks, but this does not translate to a single direct victory.

Architecture Differences

The two GPUs represent fundamentally different design philosophies. The AMD Radeon RX 6800M uses the Navi 22 chip on TSMC’s 7 nm process, packing 17,200 million transistors into a 335 mm² die. The NVIDIA RTX A4000 uses the GA104 chip on Samsung’s 8 nm process, with slightly more transistors (17,400 million) but a substantially larger die at 392 mm². This results in a transistor density of 51.3M per mm² for AMD versus 44.4M per mm² for NVIDIA, meaning the AMD chip is more densely packed despite its smaller size.

The memory subsystems diverge sharply. The RX 6800M offers 12 GB of GDDR6 on a 192-bit bus, yielding 384.0 GB/s of bandwidth. The RTX A4000 doubles the bus width to 256-bit and provides 16 GB of GDDR6, achieving 448.0 GB/s. The NVIDIA card’s memory clock is lower (1750 MHz vs. 2000 MHz), but the wider bus more than compensates, delivering 64 GB/s more bandwidth. Shader resources also favor NVIDIA: the RTX A4000 has 6,144 shading units, 192 TMUs, and 96 ROPs, compared to the RX 6800M’s 2,560 shading units, 160 TMUs, and 64 ROPs. The RTX A4000 also has 48 RT cores and 192 tensor cores, while the RX 6800M has 40 RT cores and no tensor cores.

Clock speeds tell a different story. The RX 6800M runs at a 2116 MHz base and 2390 MHz boost, with a game clock of 2300 MHz. The RTX A4000 is dramatically lower-clocked at 735 MHz base and 1560 MHz boost. Despite this, the RTX A4000 achieves higher FP32 throughput (19.17 TFLOPS vs. 12.24 TFLOPS) due to its far greater shader count. The FP16 comparison is stark: AMD reaches 24.47 TFLOPS with a 2:1 ratio, while NVIDIA equals its FP32 at 19.17 TFLOPS with a 1:1 ratio, indicating NVIDIA’s Ampere architecture handles FP16 without rate-shifting penalties.

The Verdict

The data directs a clear verdict: the NVIDIA RTX A4000 is the superior GPU for every measured workload. Its 10-0 head-to-head record, combined with large margins in compute (48.4%), 2D (47.5%), and DirectX 9 (38.7%), makes it the definitive choice for users prioritizing raw performance across APIs and compute tasks. The RX 6800M’s higher percentile ranking (74th vs. 72nd) and higher average benchmark score (28,874 vs. 26,683) are misleading metrics that do not survive direct comparison—the averages are inflated by benchmarks where the two do not compete directly, such as Geekbench Metal, where the RX 6800M scores 113,721, a test the RTX A4000 did not run.

For gaming specifically, the RTX A4000 wins the modern 3DMark Steel Nomad DX12 test by 14.1%, and its Vulkan score is 25.8% higher, suggesting better performance in cross-platform titles. The RX 6800M’s advantages—higher clocks, smaller die, and lower power draw at 145 W versus 140 W (a negligible 5 W difference)—do not translate into any benchmark victory. The NVIDIA card also offers more memory (16 GB vs. 12 GB) and wider bus (256-bit vs. 192-bit), future-proofing for higher-resolution textures. Users should select the RTX A4000 without hesitation; the RX 6800M is only defensible if the integrated form factor (IGP vs. single-slot) is a hard requirement, though it offers no performance benefit in any measured test.

FAQ

Q: Which GPU wins in compute performance?

A: The NVIDIA RTX A4000 wins decisively. In PassMark GPU Compute, it scores 9,760 versus the AMD RX 6800M’s 5,032, a 48.4% lead. Its FP32 throughput is 19.17 TFLOPS compared to 12.24 TFLOPS for the AMD card.

Q: Is the AMD RX 6800M better for DirectX 12 gaming?

A: No. The RTX A4000 wins PassMark DirectX 12 with a score of 72 versus 65 for the RX 6800M, a 9.7% margin. In 3DMark Steel Nomad DX12, the NVIDIA card also leads with 2,604 versus 2,238, a 14.1% advantage.

Q: How do their memory configurations compare?

A: The RTX A4000 has 16 GB of GDDR6 on a 256-bit bus with 448.0 GB/s bandwidth. The RX 6800M has 12 GB on a 192-bit bus with 384.0 GB/s. The NVIDIA card offers 4 GB more memory and 64 GB/s more bandwidth.

Q: Which card has higher clock speeds?

A: The AMD RX 6800M runs much faster, with a 2116 MHz base and 2390 MHz boost, compared to the RTX A4000’s 735 MHz base and 1560 MHz boost. However, the NVIDIA card’s higher shader count compensates for the lower clocks.

Q: What are the physical size differences?

A: The RTX A4000 is a single-slot card measuring 241 mm in length and 112 mm in height, with a 1x 6-pin power connector. The RX 6800M is an integrated GPU (IGP) with no power connectors and portable-device-dependent display outputs.

Q: Which GPU has better API support?

A: Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The RTX A4000 additionally has 192 tensor cores for AI workloads, which the RX 6800M lacks entirely.

Head-to-Head Benchmarks

The RTX A4000’s largest victory is in PassMark GPU Compute, where its 9,760 score crushes the RX 6800M’s 5,032 by 48.4%. This is the single most lopsided result and signals a massive advantage in non-graphics processing. The second-largest gap is PassMark G2D, with the NVIDIA card scoring 1,024 against 538, a 47.5% margin—nearly double the 2D performance. Legacy API performance also heavily favors NVIDIA: PassMark DirectX 9 shows a 240 vs. 147 score (38.7% lead), while DirectX 10 and 11 both show roughly 19.7% advantages (126 vs. 101 and 158 vs. 127, respectively).

In modern graphics APIs, the RTX A4000 maintains its lead but by smaller margins. Geekbench Vulkan shows 127,645 versus 94,766, a 25.8% gap, while Geekbench OpenCL shows 105,739 versus 87,621, a 17.1% gap. The 3DMark Steel Nomad DX12 test, a measure of contemporary gaming performance, has the NVIDIA card at 2,604 versus 2,238, a 14.1% edge. The closest result is PassMark DirectX 12, where the RTX A4000 wins 72 to 65, a narrow 9.7% margin. The RX 6800M’s best showing relative to the RTX A4000 is in that same DirectX 12 test, but it still loses. Across all ten benchmarks, the average loss for the RX 6800M is approximately 27%, with no test where it manages to edge ahead.

Specification Differences

The two cards differ across nearly every core specification. The RX 6800M uses a 7 nm process from TSMC, while the RTX A4000 uses an 8 nm process from Samsung. Transistor counts are close (17,200 million vs. 17,400 million), but die size differs notably: 335 mm² for AMD versus 392 mm² for NVIDIA. The RX 6800M has a higher transistor density at 51.3M per mm² versus 44.4M per mm².

Memory is a clear differentiator: the RX 6800M has 12 GB of GDDR6 on a 192-bit bus with 384.0 GB/s bandwidth, while the RTX A4000 provides 16 GB on a 256-bit bus with 448.0 GB/s. Shader hardware heavily favors NVIDIA: 6,144 shading units, 192 TMUs, and 96 ROPs versus AMD’s 2,560, 160, and 64. The RTX A4000 also has 48 RT cores and 192 tensor cores, while the RX 6800M has 40 RT cores and no tensor cores.

Clock speeds are inverted: AMD runs at 2116 MHz base and 2390 MHz boost, NVIDIA at 735 MHz base and 1560 MHz boost. This leads to different throughput figures: the RX 6800M delivers 12.24 TFLOPS FP32 and 24.47 TFLOPS FP16 (2:1), while the RTX A4000 delivers 19.17 TFLOPS for both FP32 and FP16 (1:1). The RX 6800M has a higher pixel rate (153.0 GPixel/s vs. 149.8) but lower texture rate (382.4 GTexel/s vs. 299.5). Power draw is similar: 145 W for AMD versus 140 W for NVIDIA, though the RX 6800M is an IGP with no power connectors, while the RTX A4000 is single-slot with a 1x 6-pin connector and a 300 W suggested PSU. The RTX A4000 offers 4x DisplayPort 1.4a outputs, while the RX 6800M’s outputs are portable-device dependent.