AMD Radeon RX 6600M vs AMD Radeon RX 6750 XT Comparison

FAQ

Q: Which GPU has the higher average benchmark score?

A: The AMD Radeon RX 6750 XT records an average benchmark score of 26011, while the AMD Radeon RX 6600M scores 23273. The desktop part sits in the 71st percentile of all GPUs, whereas the mobile part sits in the 68th percentile.

Q: How large is the performance gap in the 3DMark Steel Nomad DX12 test?

A: The RX 6750 XT scores 2548, which is 70.4% higher than the RX 6600M's 1495. This is the largest single-test delta between the two cards.

Q: Is there any benchmark where the RX 6600M wins?

A: Yes, in Geekbench OpenCL the RX 6600M scores 67765 versus 16360 for the RX 6750 XT, a 75.9% advantage in favor of the mobile GPU. This is the only test win for the RX 6600M out of 11 head-to-head benchmarks.

Q: How do the two cards compare in terms of memory bandwidth?

A: The RX 6750 XT has 432.0 GB/s of bandwidth with a 192-bit bus and 12 GB of GDDR6. The RX 6600M has 224.0 GB/s with a 128-bit bus and 8 GB of GDDR6. The desktop card offers roughly 93% more bandwidth.

Q: What are the thermal design power figures?

A: The RX 6750 XT is rated at 250 W, while the RX 6600M is rated at 100 W. The desktop card consumes 150 W more, which reflects its larger die and higher clock speeds.

Q: Do both GPUs support the same DirectX feature level?

A: Yes, both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Their API feature sets are identical despite the differences in hardware resources.

Architecture Differences

Both GPUs belong to the Radeon RX 6000 series and share the RDNA 2.0 architecture on TSMC's 7 nm process. The RX 6750 XT uses the Navi 22 chip, while the RX 6600M uses Navi 23. This is not a minor clock binning difference; the two chips are physically distinct.

The Navi 22 die in the RX 6750 XT contains 17,200 million transistors on a 335 mm² die, yielding a transistor density of 51.3M per mm². The Navi 23 die in the RX 6600M contains 11,060 million transistors on a 237 mm² die, with a density of 46.7M per mm². The desktop chip has 55.5% more transistors and a 41.4% larger die area.

Compute resources scale accordingly. The RX 6750 XT has 2560 shading units, 160 texture mapping units, and 64 ROPs. The RX 6600M has 1792 shading units, 112 TMUs, and also 64 ROPs. The desktop card carries 768 more shading units and 48 more TMUs. Ray tracing hardware follows the same pattern: 40 RT cores on the RX 6750 XT versus 28 on the RX 6600M.

Clock behavior differs significantly. The RX 6750 XT runs a base clock of 2150 MHz, a game clock of 2495 MHz, and a boost clock of 2600 MHz. The RX 6600M operates at 2068 MHz base, 2177 MHz game, and 2416 MHz boost. The desktop GPU sustains higher frequencies across all three clock states, which compounds its architectural advantage.

Memory configuration is another major divider. The RX 6750 XT uses 12 GB of GDDR6 on a 192-bit bus, with memory clocked at 2250 MHz (18 Gbps effective). The RX 6600M uses 8 GB on a 128-bit bus, with memory at 1750 MHz (14 Gbps effective). These figures produce 432.0 GB/s versus 224.0 GB/s in bandwidth, a 92.9% gap that heavily influences high-resolution and high-texture workloads.

The interface and power delivery also differ. The RX 6750 XT connects via PCIe 4.0 x16 and requires both a 6-pin and an 8-pin power connector. The RX 6600M uses PCIe 4.0 x8 and has no external power connectors, as it is an IGP-class mobile part. The desktop card's 250 W TDP versus 100 W TDP reflects the full breadth of these differences.

Where Each One Wins

The RX 6750 XT is the clear winner in almost every measurable category. It wins 10 of 11 head-to-head benchmarks, with victories spanning DirectX 9, 10, 11, 12, Vulkan, Metal, compute, and 2D graphics tests. The data shows a desktop GPU designed for sustained high-frame-rate gaming at high resolutions, with enough memory bandwidth and compute throughput to handle modern titles and content creation workloads.

The RX 6600M's single win in Geekbench OpenCL is notable but isolated. That test appears to favor the mobile GPU's specific configuration, possibly due to driver scheduling or memory access patterns. Outside of that anomaly, the RX 6600M trails by margins ranging from 32.4% to 70.4% across the other tests.

For gaming, the RX 6750 XT is the stronger choice. Its 70.4% lead in 3DMark Steel Nomad DX12 is the headline figure. It also leads 53.8% in Passmark DirectX 12 and 42.9% in DirectX 9, indicating consistent superiority across different API generations. The RX 6600M can still play the same games, but at lower frame rates or reduced settings.

For compute workloads, the RX 6750 XT dominates in Passmark GPU Compute with a 69.1% lead, but the RX 6600M's OpenCL result suggests that not all compute benchmarks agree. Users running OpenCL-specific applications should examine their exact workload before choosing.

The RX 6600M's advantages are not in performance but in form factor and power. It is an IGP with no external power connectors and a 100 W TDP, making it suitable for laptops where the RX 6750 XT's 250 W TDP and dual-slot cooler are impossible. The mobile part trades performance for portability.

Specification Differences

The two cards differ on nearly every hardware specification. The RX 6750 XT uses the Navi 22 chip, while the RX 6600M uses Navi 23. Transistor counts are 17,200 million versus 11,060 million, and die sizes are 335 mm² versus 237 mm². Transistor density is 51.3M/mm² versus 46.7M/mm².

Clock speeds diverge at every point. Base clocks are 2150 MHz versus 2068 MHz, game clocks are 2495 MHz versus 2177 MHz, and boost clocks are 2600 MHz versus 2416 MHz. Memory clocks are 2250 MHz versus 1750 MHz, with effective data rates of 18 Gbps versus 14 Gbps.

Memory capacity and bus width are 12 GB GDDR6 on 192-bit versus 8 GB GDDR6 on 128-bit. Bandwidth is 432.0 GB/s versus 224.0 GB/s. The shading unit count is 2560 versus 1792, TMUs are 160 versus 112, and ROPs are 64 for both. RT cores are 40 versus 28.

Pixel rate is 166.4 GPixel/s versus 154.6 GPixel/s, a 7.6% difference. Texture rate is 416.0 GTexel/s versus 270.6 GTexel/s, a 53.7% difference. FP32 throughput is 13.31 TFLOPS versus 8.659 TFLOPS, and FP16 is 26.62 TFLOPS versus 17.32 TFLOPS. The TDP is 250 W versus 100 W.

The RX 6750 XT uses a dual-slot cooler with 1x 6-pin and 1x 8-pin power connectors, while the RX 6600M is an IGP with no power connectors. Bus interface is PCIe 4.0 x16 versus PCIe 4.0 x8. Display outputs are 1x HDMI 2.1 and 3x DisplayPort 1.4a on the desktop card, versus "Portable Device Dependent" on the mobile part. The RX 6750 XT has physical dimensions of 267 mm length, 110 mm height, and 40 mm width; the RX 6600M has no recorded dimensions.

Head-to-Head Benchmarks

The head-to-head results show a dominant performance profile for the RX 6750 XT, but the margins vary considerably by test type.

The largest win for the RX 6750 XT is in 3DMark Steel Nomad DX12, where it scores 2548 against 1495, a 70.4% advantage. This test stresses modern DirectX 12 rendering, and the desktop card's higher shading unit count, faster clocks, and much larger memory bandwidth translate directly into a massive lead.

Passmark GPU Compute shows a 69.1% win for the RX 6750 XT, with scores of 9550 versus 5646. This test exercises raw compute throughput, and the desktop card's 13.31 TFLOPS FP32 versus 8.659 TFLOPS explains the magnitude of the gap.

Passmark DirectX 12 gives the RX 6750 XT a 53.8% win, scoring 80 versus 52. The smaller absolute numbers make the percentage look larger than the real-world difference, but the relative performance is still substantial.

Geekbench Metal shows a 48.8% lead for the RX 6750 XT, with 137249 versus 92237. This is the closest of the large-margin wins, indicating that the mobile GPU holds up reasonably well under Metal's API overhead.

Passmark G3D scores 20700 versus 13929, a 48.6% win for the RX 6750 XT. This is the most representative overall gaming score, and it aligns closely with the Metal result.

Passmark DirectX 10 gives a 43.7% win, with 125 versus 87. Passmark DirectX 9 shows a 42.9% win, with 263 versus 184. The RX 6750 XT maintains its edge even in older API workloads, where memory bandwidth is less critical and raw shader throughput dominates.

Geekbench Vulkan shows a 33% win for the RX 6750 XT, scoring 98089 versus 73740. This is a smaller margin than the DX12 test, suggesting the mobile GPU's driver or architecture handles Vulkan more efficiently relative to its hardware limits.

Passmark G2D shows a 33.5% win, with 972 versus 728. Even in 2D graphics tests, the desktop card maintains a solid lead.

Passmark DirectX 11 shows the smallest gaming margin at 32.4%, with 180 versus 136.

The single win for the RX 6600M comes in Geekbench OpenCL, where it scores 67765 versus 16360, a 75.9% advantage. This is the largest delta in either direction across all tests. The result is surprising given the RX 6600M's lower compute throughput, and it suggests either a driver optimization or a test methodology quirk that favors the mobile part's memory subsystem.

Overall, the RX 6750 XT wins 10 of 11 tests with an average lead of roughly 47% across its victories. The RX 6600M wins one test with a 75.9% margin. The desktop card's aggregate average score is 26011 versus 23273, an 11.8% difference, but the head-to-head deltas show that the gap is far larger in most specific workloads.