AMD Radeon RX 6600 XT vs NVIDIA RTX A5000 Mobile Comparison

# NVIDIA RTX A5000 Mobile vs AMD Radeon RX 6600 XT

The NVIDIA RTX A5000 Mobile and AMD Radeon RX 6600 XT are both end-of-life GPUs that land in the same performance neighborhood, with the A5000 Mobile averaging 24,763 across all benchmark tests and the RX 6600 XT averaging 24,442. That 1.3% overall gap is almost negligible, but the two cards achieve that parity through very different strengths. The A5000 Mobile wins 4 of the 9 head-to-head tests, while the RX 6600 XT takes 5, making this a genuine split decision depending on workload.

Head-to-Head Benchmarks

The most dramatic separation appears in compute-oriented tests. In Geekbench OpenCL, the RTX A5000 Mobile scores 110,877 against the RX 6600 XT's 80,503 — a 37.7% advantage. That is the single largest delta in the entire comparison and reflects the NVIDIA card's massive shader count advantage. The gap narrows in Geekbench Vulkan, but the A5000 Mobile still leads with 88,144 versus 72,417, a 21.7% margin. These two wins alone establish the NVIDIA card as the clear choice for GPU compute workloads where raw parallel throughput matters.

DirectX 12 performance also favors NVIDIA, with the A5000 Mobile posting 72 in Passmark DX12 versus 61 for the RX 6600 XT — an 18% lead. The A5000 Mobile also edges out the RX 6600 XT in Passmark DirectX 10, scoring 115 against 109, a 5.5% difference. Those wins suggest the Ampere architecture handles modern graphics APIs with more headroom, particularly when tessellation and async compute are involved.

The AMD card fights back in several legacy and rasterization-heavy tests. In Passmark DirectX 11, the RX 6600 XT scores 163 versus 133 for the A5000 Mobile — an 18.4% reversal. DirectX 9 shows a similar pattern: RX 6600 XT at 194, A5000 Mobile at 169, giving AMD a 12.9% edge. These older API results indicate the RDNA 2 architecture extracts more performance from established rendering paths, possibly due to its higher clock speeds and streamlined front-end.

The remaining tests split more narrowly. Passmark G3D goes to the RX 6600 XT with 16,461 against 15,779, a 4.1% margin. Passmark GPU Compute also favors AMD at 7,520 versus 6,945, a 7.6% lead. The biggest AMD win comes in Passmark G2D, where the RX 6600 XT scores 912 against 629 — a 31% blowout that is surprising given both cards are discrete GPUs, but the result is unambiguous.

Where Each One Wins

The RTX A5000 Mobile is the pick for compute-heavy workloads. Its Geekbench OpenCL lead of 37.7% and Vulkan lead of 21.7% show that when you need general-purpose GPU compute — think rendering, simulation, or machine learning inference — the NVIDIA card is in a different class. The 18% DirectX 12 win also makes it the better option for modern games that use DX12's advanced features, though the margin there is far smaller than in compute.

The RX 6600 XT excels at older API rendering and 2D performance. Its 18.4% DirectX 11 win and 12.9% DirectX 9 win mean that titles running on legacy engines will feel noticeably smoother on the AMD card. The 31% G2D advantage suggests better performance for desktop compositing, video playback, and other 2D-accelerated tasks. For pure rasterization as measured by Passmark G3D, AMD holds a modest 4.1% edge, making it the better general gaming card in traditional scenarios.

Overall, the data shows a clear split: NVIDIA for compute and modern API workloads, AMD for legacy compatibility and 2D throughput. Neither card dominates the other across the board, which is unusual for GPUs in the same performance tier.

Architecture Differences

The two cards come from fundamentally different design philosophies. The RTX A5000 Mobile uses NVIDIA's Ampere architecture on a GA104 chip, built on Samsung's 8 nm process with 17,400 million transistors on a 392 mm² die. The RX 6600 XT uses AMD's RDNA 2.0 architecture on the Navi 23 chip, fabricated by TSMC on 7 nm with 11,060 million transistors on a 237 mm² die. The A5000 Mobile has a higher transistor count and larger die, but the RX 6600 XT achieves better transistor density at 46.7M per mm² versus 44.4M per mm², indicating AMD's process advantage.

Shading unit counts differ dramatically. The A5000 Mobile packs 6,144 shading units, 192 TMUs, and 96 ROPs, while the RX 6600 XT has 2,048 shading units, 128 TMUs, and 64 ROPs. Despite having three times the shading units, the NVIDIA card only produces 19.35 TFLOPS FP32 versus 10.60 TFLOPS for AMD — the clocks tell the story. The A5000 Mobile boosts to 1,575 MHz, while the RX 6600 XT boosts to 2,589 MHz with a game clock of 2,359 MHz. That 1,014 MHz boost clock advantage lets AMD's smaller chip keep pace in many tests.

Ray tracing hardware exists on both, with the A5000 Mobile featuring 48 RT cores and the RX 6600 XT featuring 32. The NVIDIA card also includes 192 tensor cores, which the AMD card lacks entirely. Memory configurations diverge sharply: the A5000 Mobile has 16 GB of GDDR6 on a 256-bit bus delivering 448.0 GB/s, while the RX 6600 XT has 8 GB on a 128-bit bus at 256.0 GB/s. The NVIDIA card's memory bandwidth advantage is substantial.

Power characteristics differ slightly, with the A5000 Mobile rated at 150 W TDP and the RX 6600 XT at 160 W. The A5000 Mobile requires no external power connectors and is described as "Portable Device Dependent" for display outputs, reflecting its mobile design. The RX 6600 XT is a dual-slot card measuring 190 mm long, needs a single 8-pin connector, and recommends a 450 W PSU.

FAQ

Q: Which GPU is faster in raw compute performance?

A: The NVIDIA RTX A5000 Mobile dominates compute. In Geekbench OpenCL it scores 110,877 versus 80,503 for the RX 6600 XT, a 37.7% lead. Vulkan also favors NVIDIA at 88,144 versus 72,417, a 21.7% margin.

Q: Does the RX 6600 XT win any benchmark categories by a large margin?

A: Yes. The RX 6600 XT wins Passmark G2D by 31% (912 versus 629) and Passmark DirectX 11 by 18.4% (163 versus 133). It also leads DirectX 9 by 12.9% (194 versus 169).

Q: How do their memory configurations compare?

A: The A5000 Mobile has 16 GB GDDR6 on a 256-bit bus with 448.0 GB/s bandwidth. The RX 6600 XT has 8 GB GDDR6 on a 128-bit bus with 256.0 GB/s bandwidth. NVIDIA's memory subsystem is twice as wide and provides 75% more bandwidth.

Q: Why does the RX 6600 XT achieve competitive performance with fewer shading units?

A: The RX 6600 XT runs at a 2,589 MHz boost clock versus 1,575 MHz for the A5000 Mobile. This 1,014 MHz advantage compensates for having only 2,048 shading units versus 6,144, allowing AMD to post 10.60 TFLOPS FP32 against NVIDIA's 19.35 TFLOPS.

Q: Which card supports ray tracing better?

A: The A5000 Mobile has 48 RT cores versus 32 on the RX 6600 XT, and it also adds 192 tensor cores that AMD lacks entirely. However, both cards support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: What is the overall average performance difference?

A: The A5000 Mobile averages 24,763 across all benchmarks, while the RX 6600 XT averages 24,442. That is a 1.3% difference in NVIDIA's favor, and both cards sit at the 70th percentile of all GPUs.

Specification Differences

| Specification | NVIDIA RTX A5000 Mobile | AMD Radeon RX 6600 XT |

|---|---|---|

| Architecture | Ampere | RDNA 2.0 |

| Process Node | 8 nm (Samsung) | 7 nm (TSMC) |

| Transistors | 17,400 million | 11,060 million |

| Die Size | 392 mm² | 237 mm² |

| Transistor Density | 44.4M / mm² | 46.7M / mm² |

| Base Clock | 900 MHz | 1968 MHz |

| Boost Clock | 1575 MHz | 2589 MHz |

| Game Clock | — | 2359 MHz |

| Memory Size | 16 GB | 8 GB |

| Memory Bus | 256 bit | 128 bit |

| Memory Bandwidth | 448.0 GB/s | 256.0 GB/s |

| Shading Units | 6144 | 2048 |

| TMUs | 192 | 128 |

| ROPs | 96 | 64 |

| RT Cores | 48 | 32 |

| Tensor Cores | 192 | — |

| FP32 Performance | 19.35 TFLOPS | 10.60 TFLOPS |

| FP16 Performance | 19.35 TFLOPS (1:1) | 21.21 TFLOPS (2:1) |

| Pixel Rate | 151.2 GPixel/s | 165.7 GPixel/s |

| Texture Rate | 302.4 GTexel/s | 331.4 GTexel/s |

| TDP | 150 W | 160 W |

| Power Connectors | None | 1x 8-pin |

| Suggested PSU | — | 450 W |

| Bus Interface | PCIe 4.0 x16 | PCIe 4.0 x8 |

| Display Outputs | Portable Device Dependent | 1x HDMI 2.1, 3x DisplayPort 1.4a |

| Dimensions | — | 190 mm x 110 mm x 40 mm |

| Release Date | 2021-04-11 | 2021-07-29 |

| Launch MSRP | — | 379 USD |

The Verdict

Pick the NVIDIA RTX A5000 Mobile if your priority is compute performance or modern API efficiency. The 37.7% OpenCL lead and 21.7% Vulkan lead are decisive, and the 18% DirectX 12 advantage makes it the better choice for current-generation games. The 16 GB memory capacity and 448.0 GB/s bandwidth also provide headroom for large datasets and high-resolution textures that would strain the RX 6600 XT's 8 GB frame buffer. The 192 tensor cores are a unique asset for AI workloads.

Pick the AMD Radeon RX 6600 XT if you primarily run DirectX 11 or DirectX 9 titles, or if 2D performance matters. Its 18.4% DX11 win and 12.9% DX9 win show it handles legacy rendering paths more efficiently, while the 31% G2D advantage makes it snappier for desktop and productivity use. The RX 6600 XT also leads in Passmark G3D by 4.1% and GPU Compute by 7.6%, giving it the edge in general rasterization despite losing the compute crown.

The data does not declare an overall winner. The 1.3% average score difference is within noise, and the wins are split 4-5. Choose based on your specific application mix. If you need GPU compute or modern graphics APIs, the A5000 Mobile is worth its higher transistor count and memory bandwidth. If you live in DX11-era games or care about 2D performance, the RX 6600 XT's higher clocks and RDNA 2 efficiency deliver a better experience. Both cards sit at the 70th percentile, so neither is a bad choice for their respective strengths.