AMD Radeon RX 6600M vs AMD Radeon RX 6700M Comparison

FAQ

Q: Which GPU has the higher average benchmark score?

A: The AMD Radeon RX 6700M records an average benchmark score of 25633, while the AMD Radeon RX 6600M scores 23273. This places the 6700M in the 71st percentile of all GPUs, compared to the 6600M's 68th percentile.

Q: How does the 6700M compare to its closest rivals?

A: The 6700M sits within 0.9% of its nearest competitors. It trails the AMD Radeon Pro W5700 (25726) by 0.4%, the NVIDIA GeForce RTX 3080 Ti Mobile (25740) by 0.4%, the AMD FirePro D700 (25842) by 0.8%, and the AMD FirePro W7100 (25856) by 0.9%.

Q: Where does the 6600M stand relative to its peer group?

A: The 6600M is effectively tied with the AMD Radeon R9 M290X (23276, 0% delta), the AMD Radeon Pro Vega 16 (23250, 0.1% ahead), and the NVIDIA P106-100 (23249, 0.1% ahead). It sits 0.2% behind the AMD Radeon AI PRO R9700 (23315).

Q: Which GPU wins more benchmark tests head-to-head?

A: The RX 6600M wins 6 of the 11 recorded comparisons, while the RX 6700M wins 5. However, the 6700M's victories are often by larger margins.

Q: What is the biggest single-test advantage for each GPU?

A: The 6700M's largest win is in Passmark DirectX 12, where it scores 65 versus 52, a 25% advantage. The 6600M's largest win is in Passmark G2D, scoring 728 versus 555, a 23.8% advantage.

Q: Do both GPUs support the same modern APIs?

A: Yes. Both list DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4 in the database. Both are based on the RDNA 2.0 architecture and are built on TSMC's 7 nm process.

Architecture Differences

The two mobile GPUs share the same fundamental design lineage: both are AMD Radeon RX 6000 series parts using the RDNA 2.0 architecture, fabricated by TSMC on a 7 nm process. They also share the same Navi Mobile generation and the same release date of May 30, 2021, and both are marked as end-of-life products.

The core silicon differs substantially. The RX 6700M uses the Navi 22 chip with 17,200 million transistors on a 335 mm² die, yielding a transistor density of 51.3 million per mm². The RX 6600M uses the smaller Navi 23 chip with 11,060 million transistors on a 237 mm² die, giving a density of 46.7 million per mm². This means the 6700M packs roughly 55% more transistors into a die that is about 41% larger by area.

The execution resources scale accordingly. The 6700M carries 2304 shading units, 144 texture mapping units, and 64 ROPs. The 6600M has 1792 shading units, 112 TMUs, and the same 64 ROPs. The 6700M also has 36 ray tracing cores versus 28 on the 6600M. Neither GPU has tensor cores listed in the database.

Clock behavior is interesting because the smaller chip runs faster. The 6600M has a base clock of 2068 MHz and a boost clock of 2416 MHz, with a game clock of 2177 MHz. The 6700M has a lower base clock of 1489 MHz but a slightly lower boost clock of 2400 MHz and a game clock of 2300 MHz. Memory clocks also differ: the 6700M runs its GDDR6 at 2000 MHz (16 Gbps effective), while the 6600M runs at 1750 MHz (14 Gbps effective).

Memory configuration is a major divergence. The 6700M has 10 GB of GDDR6 on a 160-bit bus, delivering 320.0 GB/s of bandwidth. The 6600M has 8 GB on a 128-bit bus, delivering 224.0 GB/s. The 6700M's bandwidth advantage is 43% higher, which matters for higher resolutions and texture-heavy workloads.

The bus interface differs as well. The 6700M uses PCIe 4.0 x16, while the 6600M uses PCIe 4.0 x8. Both are listed as IGP slot width with no power connectors, and both have portable-device-dependent display outputs.

Power draw is another differentiator. The 6700M has a TDP of 135 W, while the 6600M draws 100 W. The 6700M delivers higher peak throughput: 11.06 TFLOPS FP32 versus 8.659 TFLOPS, and 22.12 TFLOPS FP16 (2:1) versus 17.32 TFLOPS. Pixel rates are nearly identical (153.6 vs 154.6 GPixel/s), but texture rate favors the 6700M at 345.6 GTexel/s versus 270.6 GTexel/s.

Head-to-Head Benchmarks

The recorded data shows a split personality between these two GPUs. The 6700M dominates in modern graphics APIs and compute-oriented tests, while the 6600M shows surprising strength in legacy DirectX tests and 2D workloads.

Starting with the modern tests, the 6700M wins the 3DMark Steel Nomad DX12 run decisively: 1845 versus 1495, a 23.4% advantage. This is the single most representative test for current-generation gaming loads. In Geekbench Vulkan, the 6700M scores 90816 against 73740, a 23.2% lead. Geekbench OpenCL shows a 14.6% edge for the 6700M (77666 vs 67765). These three wins demonstrate that the 6700M's larger shader count and higher bandwidth translate directly into compute and API-level performance.

The DirectX 12 Passmark test follows the same pattern: the 6700M wins 65 versus 52, a 25% margin, its largest of the entire comparison. The DirectX 10 test also goes to the 6700M by 5.7% (92 vs 87).

The 6600M's wins are concentrated in older or lighter workloads. In Geekbench Metal, it narrowly edges out the 6700M: 92237 versus 91911, a 0.4% advantage. The Passmark DirectX 11 test goes to the 6600M by 5.1% (136 vs 129). The DirectX 9 test shows a larger 15.8% win for the 6600M (184 vs 155). The 2D test, Passmark G2D, favors the 6600M strongly at 728 versus 555, a 23.8% margin.

The overall 3D gaming score in Passmark G3D is close: the 6600M wins 13929 versus 13536, a 2.8% edge. The compute test, Passmark GPU Compute, also goes to the 6600M by 8.1% (5646 vs 5191). These results are counterintuitive given the 6700M's raw compute specifications, but the recorded data is what it is.

Score distribution matters. The 6700M's wins range from 5.7% to 25%, with three wins above 20%. The 6600M's wins include one blowout (G2D at 23.8%), one solid win (DX9 at 15.8%), and several narrow margins (0.4% to 8.1%). In terms of total impact, the 6700M's large modern-API margins are more relevant for current gaming, while the 6600M's wins skew toward lighter or legacy workloads.

The Verdict

The data supports a clear split recommendation. The AMD Radeon RX 6700M is the stronger GPU for modern gaming and compute-heavy tasks. Its 23.4% lead in 3DMark Steel Nomad DX12 and 23.2% lead in Geekbench Vulkan are the most reliable predictors of current-generation game performance. The 25% margin in Passmark DirectX 12 reinforces this. If you are buying for DX12-era games or any Vulkan title, the 6700M is the choice.

The AMD Radeon RX 6600M should not be dismissed. It wins the overall Passmark G3D score by 2.8%, which suggests that in some real-world 3D scenarios, the gap is much smaller than the flagship tests indicate. Its wins in DirectX 9 (15.8%) and DirectX 11 (5.1%) mean it handles older titles better. The 23.8% win in Passmark G2D indicates stronger 2D performance, which matters for desktop work, video playback, and non-gaming GPU tasks.

For a user playing primarily modern AAA games, the 6700M's higher average score (25633 vs 23273) and its dominance in DX12 and Vulkan justify the 135 W power draw. For a user who plays a mix of esports titles, older games, or does 2D-heavy creative work, the 6600M's 100 W TDP and its wins in those specific tests make it a rational pick. The 6600M's 6-5 win count in head-to-head tests is misleading because the 6700M wins the tests that matter most for future-proofing.

Neither GPU is a clear winner overall. They are different tools for different workloads. The 6700M is the faster graphics card in modern terms; the 6600M is the more efficient and surprisingly competitive alternative in legacy and 2D scenarios.

Specification Differences

The two GPUs differ in the following recorded specification fields:

Chip and die: Navi 22 (17,200 million transistors, 335 mm²) versus Navi 23 (11,060 million transistors, 237 mm²). Transistor density differs: 51.3M / mm² versus 46.7M / mm².

Clocks: Base clock 1489 MHz versus 2068 MHz. Boost clock 2400 MHz versus 2416 MHz. Game clock 2300 MHz versus 2177 MHz. Memory clock 2000 MHz (16 Gbps effective) versus 1750 MHz (14 Gbps effective).

Memory: 10 GB GDDR6 versus 8 GB GDDR6. Bus width 160 bit versus 128 bit. Bandwidth 320.0 GB/s versus 224.0 GB/s.

Compute units: Shading units 2304 versus 1792. TMUs 144 versus 112. ROPs identical at 64. Ray tracing cores 36 versus 28.

Performance rates: Pixel rate 153.6 GPixel/s versus 154.6 GPixel/s. Texture rate 345.6 GTexel/s versus 270.6 GTexel/s. FP32 11.06 TFLOPS versus 8.659 TFLOPS. FP16 22.12 TFLOPS (2:1) versus 17.32 TFLOPS (2:1).

Power and interface: TDP 135 W versus 100 W. Bus interface PCIe 4.0 x16 versus PCIe 4.0 x8.

Identical fields: Both use RDNA 2.0, TSMC 7 nm, GDDR6 memory type, IGP slot width, no power connectors, no suggested PSU, portable-device-dependent display outputs, DirectX 12 Ultimate (12_2), OpenGL 4.6, Vulkan 1.4, same release date, same predecessor (Polaris Mobile), same manufacturer, and same series.

Where Each One Wins

AMD Radeon RX 6700M wins in:

• Modern DX12 gaming: 3DMark Steel Nomad (1845 vs 1495, +23.4%) and Passmark DX12 (65 vs 52, +25%).
• Vulkan workloads: Geekbench Vulkan (90816 vs 73740, +23.2%).
• OpenCL compute: Geekbench OpenCL (77666 vs 67765, +14.6%).
• DirectX 10 legacy: Passmark DX10 (92 vs 87, +5.7%).
• Bandwidth-sensitive scenarios: 320.0 GB/s versus 224.0 GB/s, which supports higher resolutions and larger textures.
• High transistor count tasks: 17,200 million transistors and 2304 shading units provide raw headroom for shader-heavy effects.

AMD Radeon RX 6600M wins in:

• Metal API: Geekbench Metal (92237 vs 91911, +0.4%).
• DirectX 11 gaming: Passmark DX11 (136 vs 129, +5.1%).
• DirectX 9 legacy: Passmark DX9 (184 vs 155, +15.8%).
• 2D performance: Passmark G2D (728 vs 555, +23.8%).
• Overall Passmark G3D: 13929 versus 13536, +2.8%.
• GPU compute in Passmark: 5646 versus 5191, +8.1%.
• Efficiency: 100 W TDP versus 135 W, which matters for thin-and-light laptops and battery life.
• Higher base clock: 2068 MHz versus 1489 MHz, which helps in lightly threaded or latency-sensitive workloads.

The practical takeaway: the 6700M is for gamers who want maximum frame rates in current and upcoming titles, especially those using ray tracing or DX12 Ultimate features. The 6600M is for users who value lower power draw, play a lot of older games, or need strong 2D and compute performance per watt. The 6700M's 71st percentile ranking versus the 6600M's 68th percentile confirms the overall hierarchy, but the 6600M's specific wins show it is not simply a lesser card across the board.