AMD Radeon RX 6500 XT vs AMD Radeon RX 6600S Comparison

Both AMD parts in this comparison target the same 4 GB GDDR6 segment, but they are built for completely different machines. The RX 6500 XT is a desktop card, while the RX 6600S is a mobile chip. Benchmark results show the RX 6600S is the faster GPU in nearly every compute and graphics workload, winning 7 of 8 head-to-head tests. However, the RX 6500 XT takes a clear lead in 2D performance. The data suggests the RX 6600S is the stronger choice for gaming and general GPU compute, provided you are looking at a laptop, while the RX 6500 XT is the only option here for a desktop build.

The Verdict

Choose the AMD Radeon RX 6600S if you need maximum performance in a portable chassis. The benchmark data is unambiguous: the RX 6600S wins the 3DMark Steel Nomad test is not available for it, but it dominates the PassMark G3D score with 12,649 versus 9,608 for the RX 6500 XT, a 24% advantage. It also leads in every DirectX API test, from a 14.3% margin in DirectX 11 to a 38.6% margin in DirectX 9. The RX 6600S also offers higher compute throughput, with a 27.3% lead in Geekbench OpenCL and an 8.7% lead in PassMark GPU Compute. This is the card for anyone who values raw frame rates and compute performance over everything else.

Pick the AMD Radeon RX 6500 XT if you are building a desktop system and need a discrete card with standard display outputs and a conventional power connector. The RX 6500 XT is a dual-slot card with 1x HDMI 2.1 and 1x DisplayPort 1.4a, while the RX 6600S is an IGP (Integrated Graphics Processor) with display outputs listed as "Portable Device Dependent." The RX 6500 XT also has a significant win in PassMark G2D, scoring 815 versus 647 for the RX 6600S, a 26% advantage. This suggests better 2D desktop and UI responsiveness. If you are constrained to a desktop motherboard, the RX 6500 XT is the only practical choice, despite being slower in 3D workloads.

The data also reveals a trade-off in efficiency versus performance. The RX 6600S has a lower TDP of 80 W compared to the RX 6500 XT's 107 W, yet it delivers higher performance. This makes the RX 6600S the more efficient part on paper. However, the RX 6500 XT has a higher boost clock of 2815 MHz versus 2000 MHz, showing that raw clock speed does not tell the whole story. The RX 6600S compensates with more shading units and a wider memory bus. For most users, the RX 6600S is the better performer, but the RX 6500 XT is the only one that fits a standard desktop slot.

FAQ

Q: Which GPU has a higher average benchmark score?

A: The RX 6500 XT has a higher average benchmark score of 11,842 across all recorded tests, compared to 10,629 for the RX 6600S. This is largely due to the RX 6500 XT's strong showing in the 3DMark Steel Nomad DX12 test, where it scores 235, a test the RX 6600S does not have a recorded score for.

Q: How do the two cards compare in DirectX 12 performance?

A: The RX 6600S is significantly faster in DirectX 12. In the PassMark DirectX 12 test, the RX 6600S scores 56, while the RX 6500 XT scores 38. This represents a 32.1% performance advantage for the RX 6600S.

Q: Is the RX 6500 XT better in any benchmark?

A: Yes, the RX 6500 XT wins the PassMark G2D test. It scores 815, which is 26% higher than the RX 6600S's score of 647. This indicates better performance in 2D graphics operations.

Q: What is the difference in memory bandwidth?

A: The RX 6600S has substantially higher memory bandwidth at 224.0 GB/s, thanks to a 128-bit memory bus. The RX 6500 XT has a 64-bit bus and delivers 143.9 GB/s.

Q: Which GPU has more shading units?

A: The RX 6600S has 1792 shading units, while the RX 6500 XT has 1024. The RX 6600S also has more texture mapping units (112 vs 64) and more render output units (64 vs 32).

Q: What are the power requirements for each card?

A: The RX 6500 XT has a TDP of 107 W and requires a 1x 6-pin power connector. The RX 6600S has a lower TDP of 80 W and requires no external power connector, drawing power directly from the motherboard.

Architecture Differences

Both GPUs are built on AMD's RDNA 2.0 architecture, but they are implemented on different chips and process nodes. The RX 6500 XT uses the Navi 24 chip, fabricated on TSMC's 6 nm process. The RX 6600S uses the larger Navi 23 chip, built on TSMC's 7 nm process. This is a key distinction: the Navi 23 is a much larger and more complex die, with 11,060 million transistors on a 237 mm² die. In contrast, the Navi 24 has 5,400 million transistors on a 107 mm² die. The transistor density is slightly higher on the 6 nm Navi 24 (50.5M / mm²) compared to the 7 nm Navi 23 (46.7M / mm²), but the Navi 23 has far more total resources.

The architectural differences extend to the compute units. The RX 6600S has 1792 shading units, 112 TMUs, and 64 ROPs, while the RX 6500 XT has 1024 shading units, 64 TMUs, and 32 ROPs. The RX 6600S also has more ray tracing cores (28 vs 16). This means the RX 6600S is not just a clocked-up version of the RX 6500 XT; it is a fundamentally more capable chip with more parallel processing hardware. The RX 6600S is part of the Navi Mobile generation, while the RX 6500 XT is part of the Navi II generation, though both are in the RX 6000 series.

The memory subsystems also differ architecturally. The RX 6600S uses a 128-bit memory bus, which doubles the 64-bit bus of the RX 6500 XT. This allows the RX 6600S to achieve 224.0 GB/s bandwidth despite using slower memory clocks. The RX 6500 XT compensates with faster memory clocks (2248 MHz vs 1750 MHz) but still ends up with lower total bandwidth. Both support DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, so feature-level API support is identical. The RX 6600S is limited to a PCIe 4.0 x8 interface, while the RX 6500 XT uses a narrower PCIe 4.0 x4 interface.

Specification Differences

The most obvious difference is the form factor and power delivery. The RX 6500 XT is a dual-slot desktop card with a 1x 6-pin power connector and a suggested PSU of 300 W. The RX 6600S is an IGP (Integrated Graphics Processor) with no power connectors and is described as "Portable Device Dependent" for its display outputs. The RX 6500 XT has a TDP of 107 W, while the RX 6600S has a lower TDP of 80 W.

Clock speeds favor the RX 6500 XT. It has a base clock of 2310 MHz, a boost clock of 2815 MHz, and a game clock of 2610 MHz. The RX 6600S runs significantly lower, with a base clock of 1700 MHz, a boost clock of 2000 MHz, and a game clock of 1881 MHz. Memory clocks also differ: the RX 6500 XT runs at 2248 MHz (18 Gbps effective), while the RX 6600S runs at 1750 MHz (14 Gbps effective).

The RX 6600S compensates for lower clocks with more hardware. It has 1792 shading units, 112 TMUs, and 64 ROPs, versus 1024, 64, and 32 respectively for the RX 6500 XT. The RX 6600S also has more RT cores (28 vs 16). Memory size is identical at 4 GB of GDDR6, but the RX 6600S has a 128-bit bus versus 64-bit, giving it higher bandwidth. The RX 6600S uses the PCIe 4.0 x8 interface, while the RX 6500 XT uses x4. The RX 6500 XT was released on 2022-01-18, slightly after the RX 6600S's 2022-01-03 release date. The RX 6500 XT has a launch MSRP of 199 USD; the RX 6600S has no launch MSRP listed.

Head-to-Head Benchmarks

The head-to-head data is dominated by the RX 6600S. The largest win for the RX 6600S comes in the PassMark DirectX 9 test, where it scores 176 versus 108 for the RX 6500 XT. This is a 38.6% advantage, the biggest margin in any test. The RX 6600S also wins the PassMark DirectX 12 test by 32.1%, scoring 56 versus 38.

In Geekbench OpenCL, the RX 6600S scores 66,435 against 48,289 for the RX 6500 XT, a 27.3% lead. The PassMark DirectX 10 test shows an 81 to 60 win for the RX 6600S, a 25.9% gap. The PassMark G3D test, which is a strong indicator of overall 3D gaming performance, has the RX 6600S at 12,649 versus 9,608, a 24% lead. Even in the PassMark DirectX 11 test, the RX 6600S wins with 105 versus 90, a 14.3% margin. The smallest win for the RX 6600S is in PassMark GPU Compute, where it scores 4,879 versus 4,456, an 8.7% edge.

The RX 6500 XT has only one win, but it is a decisive one. In the PassMark G2D test, it scores 815 versus 647, a 26% advantage for the RX 6500 XT. This is a clear indicator of superior 2D rendering performance. The RX 6500 XT also has a score of 235 in the 3DMark Steel Nomad DX12 test, but the RX 6600S has no comparable score in this test, so it cannot be compared directly. Overall, the RX 6600S wins 7 of the 8 directly comparable benchmarks.

Where Each One Wins

The AMD Radeon RX 6600S is the clear winner for 3D gaming and compute workloads. Its wins in PassMark G3D (12,649 vs 9,608), DirectX 12 (56 vs 38), and DirectX 9 (176 vs 108) show it handles both modern and legacy graphics APIs better. The 27.3% lead in Geekbench OpenCL and 8.7% lead in PassMark GPU Compute make it the better choice for any GPU-accelerated application, from rendering to machine learning. If you are buying a gaming laptop, this is the GPU that will deliver playable frame rates in demanding titles.

The AMD Radeon RX 6500 XT wins in 2D performance, as shown by its 26% lead in PassMark G2D (815 vs 647). This makes it the better choice for desktop productivity, multiple monitors, and any workload that is not heavily 3D-dependent. It also has the advantage of being a desktop card with standard display outputs (1x HDMI 2.1 and 1x DisplayPort 1.4a), so it can be installed in a traditional desktop PC. Its higher boost clock of 2815 MHz suggests it has headroom for overclocking, though the data does not confirm this. For a desktop user who prioritizes 2D responsiveness and needs a discrete card, the RX 6500 XT is the right pick. For everyone else, the RX 6600S is the more powerful option.