AMD Radeon RX 6600 vs AMD Radeon RX 7700 Comparison

# Where Each One Wins

The recorded benchmark data splits cleanly between these two AMD Radeon parts. The RX 6600 wins exactly one head-to-head test out of nine: Passmark DirectX 10, where it scores 95 against the RX 7700's 92, a 3.3% margin. That is the sole bright spot for the older card. Every other test in the comparison favors the RX 7700, giving it eight wins total.

The nature of those wins matters for use-case planning. In modern 3D workloads, the RX 7700 dominates. The 3DMark Steel Nomad DX12 test shows the RX 7700 at 2865 points versus the RX 6600's 1492, a 47.9% gap. For DirectX 12 specifically, the Passmark test shows a similar story: 96 versus 51, a 46.9% deficit for the RX 6600. These are the tests that correlate most strongly with current AAA game engines and demanding graphical effects.

Legacy DirectX workloads tell a different but still lopsided story. The RX 7700 leads in DirectX 9 (261 versus 197, a 24.5% margin) and DirectX 11 (186 versus 152, an 18.3% margin). The RX 6600's DirectX 10 win is an outlier, not a pattern. Compute workloads also favor the RX 7700 heavily: Passmark GPU Compute shows 10963 versus 6554, a 40.2% advantage. The Geekbench OpenCL score amplifies this: 106028 versus 28850, a 72.8% gap, the largest single delta in the entire comparison.

The RX 7700 also wins in general 2D and overall 3D performance. Passmark G2D shows 1206 versus 889, a 26.3% lead. Passmark G3D shows 20974 versus 15096, a 28% lead. If the workload is anything other than DirectX 10, the RX 7700 is the faster card. If the workload is modern, ray-traced, or compute-heavy, it is substantially faster.

# Architecture Differences

The two cards come from different generations and fundamentally different designs. The RX 6600 uses the Navi 23 chip on the RDNA 2.0 architecture, built on a 7nm TSMC process. The RX 7700 uses Navi 32 on RDNA 3.0, built on a 5nm TSMC process. The transistor counts reflect the generational leap: the RX 7700 packs 28,100 million transistors on a 346 mm² die, while the RX 6600 has 11,060 million on a 237 mm² die. Transistor density rises from 46.7 million per mm² to 81.2 million per mm².

The execution resources scale accordingly. The RX 7700 has 2560 shading units, 160 texture mapping units, and 96 render output units. The RX 6600 has 1792 shaders, 112 TMUs, and 64 ROPs. Ray tracing hardware also increases: 40 RT cores on the RX 7700 versus 28 on the RX 6600. Neither card has dedicated tensor cores; both rely on the shader array for those workloads.

Memory is a major architectural differentiator. The RX 7700 doubles the frame buffer to 16 GB of GDDR6 on a 256-bit bus, delivering 624.1 GB/s of bandwidth. The RX 6600 has 8 GB on a 128-bit bus, yielding 224.0 GB/s. That is a 2.8x bandwidth advantage for the RX 7700, which directly impacts high-resolution textures and compute data movement. Effective memory speed also differs: 19.5 Gbps versus 14 Gbps.

Clock behavior shows a nuanced picture. The RX 7700 has a higher base clock (1900 MHz versus 1626 MHz) but a slightly lower boost clock (2459 MHz versus 2491 MHz). Game clocks are nearly identical: 2041 MHz for the RX 7700 versus 2044 MHz for the RX 6600. The RX 7700 compensates with more shaders and wider memory, not raw clock speed. Pixel rate jumps from 159.4 GPixel/s to 236.1 GPixel/s, and texture rate from 279.0 GTexel/s to 393.4 GTexel/s. FP32 compute nearly triples, from 8.928 TFLOPS to 25.18 TFLOPS. Notably, the RX 7700 achieves 25.18 TFLOPS in FP16 as well (1:1 ratio), while the RX 6600 reaches 17.86 TFLOPS FP16 (2:1 ratio).

The physical and interface specifications diverge too. The RX 6600 uses a PCIe 4.0 x8 connection; the RX 7700 uses PCIe 4.0 x16. Power delivery changes from a single 8-pin connector to dual 8-pin connectors. Suggested PSU rises from 300 W to 550 W. The RX 7700 is a longer card: 267 mm versus 190 mm, with greater height (135 mm versus 110 mm) and width (50 mm versus 40 mm). The RX 7700 also adds a USB Type-C output alongside its HDMI 2.1a and two DisplayPort 2.1 outputs; the RX 6600 has HDMI 2.1 and three DisplayPort 1.4a outputs. The RX 6600 is end-of-life, while the RX 7700 is active. Their release dates are roughly four years apart: October 2021 for the RX 6600, September 2025 for the RX 7700.

# The Verdict

The data points to a clear performance hierarchy. In the head-to-head benchmark set, the RX 7700 wins eight of nine tests, and its margins are often decisive. The 47.9% lead in 3DMark Steel Nomad, the 72.8% lead in Geekbench OpenCL, and the 40.2% lead in Passmark GPU Compute are not incremental gains; they represent a different performance class. The RX 7700 is the appropriate choice for users who prioritize modern DirectX 12 gaming, compute throughput, or large memory buffers. Its 16 GB frame buffer and 624.1 GB/s bandwidth make it better positioned for texture-heavy workloads at high resolutions.

The RX 6600 remains relevant only in a narrow slice of the data. Its single win in Passmark DirectX 10 (95 versus 92) is a 3.3% margin that suggests legacy API compatibility, not superiority. Its average benchmark score of 19036 is actually higher than the RX 7700's 15852, but this is misleading: the RX 6600 has a more complete benchmark suite in the database, including Geekbench Metal (88398) and Geekbench Vulkan (67623), which the RX 7700 lacks. The RX 7700's percentile rank among all GPUs is 58, versus the RX 6600's 63, but this again reflects the differing test sets rather than raw capability.

For a user constrained to the recorded data, the recommendation is straightforward. If the workload involves DirectX 11, DirectX 12, compute, 3DMark Steel Nomad, or any modern graphical API, the RX 7700 is the faster card by significant margins. If the workload is exclusively DirectX 10, the RX 6600 wins by a hair. The RX 6600's lower TDP (132 W versus 200 W) and single 8-pin connector make it a lighter power draw, but the RX 7700's performance advantages dwarf that consideration in most scenarios. The RX 7700 also offers a longer production status (active) and a newer architecture, which may matter for ongoing driver support.

# FAQ

Q: Which card wins in DirectX 12 workloads?

A: The RX 7700 wins decisively. In 3DMark Steel Nomad DX12, it scores 2865 versus 1492, a 47.9% lead. In Passmark DirectX 12, it scores 96 versus 51, a 46.9% lead.

Q: Does the RX 6600 win any benchmark at all?

A: Yes, exactly one. It wins Passmark DirectX 10 with a score of 95 against the RX 7700's 92, a 3.3% margin.

Q: How much memory does each card have?

A: The RX 6600 has 8 GB of GDDR6 on a 128-bit bus with 224.0 GB/s bandwidth. The RX 7700 has 16 GB of GDDR6 on a 256-bit bus with 624.1 GB/s bandwidth.

Q: What is the largest performance gap between the two cards?

A: The largest delta is in Geekbench OpenCL, where the RX 7700 scores 106028 versus the RX 6600's 28850, a 72.8% difference.

Q: Are the architectures different?

A: Yes. The RX 6600 uses RDNA 2.0 on a 7nm process (Navi 23), while the RX 7700 uses RDNA 3.0 on a 5nm process (Navi 32).

Q: Which card has more ray tracing cores?

A: The RX 7700 has 40 RT cores, compared to 28 on the RX 6600.

# Head-to-Head Benchmarks

The 3DMark Steel Nomad DX12 test provides the clearest modern-gaming signal. The RX 7700 scores 2865, the RX 6600 scores 1492. That 47.9% delta is the second-largest in the comparison and reflects both the shader count advantage (2560 versus 1792) and the memory bandwidth advantage (624.1 GB/s versus 224.0 GB/s).

Geekbench OpenCL shows the largest single gap: 106028 versus 28850, a 72.8% deficit for the RX 6600. This compute-heavy test rewards the RX 7700's 25.18 TFLOPS FP32 throughput, which is nearly triple the RX 6600's 8.928 TFLOPS. The RX 7700's 1:1 FP16 ratio (25.18 TFLOPS) also contrasts with the RX 6600's 2:1 FP16 ratio (17.86 TFLOPS), suggesting different compute efficiency profiles.

Passmark GPU Compute reinforces the compute story: 10963 versus 6554, a 40.2% lead for the RX 7700. This aligns with the OpenCL result and confirms that raw number-crunching workloads heavily favor the newer card.

In DirectX 12, the Passmark result shows 96 versus 51, a 46.9% gap. This is slightly smaller than the 3DMark Steel Nomad gap but still decisive. The RX 7700's advantage persists in DirectX 11 (186 versus 152, an 18.3% lead) and DirectX 9 (261 versus 197, a 24.5% lead).

The only reversal is DirectX 10: the RX 6600 scores 95, the RX 7700 scores 92, a 3.3% margin for the older card. This is a narrow, isolated result that does not carry over to any other test.

General performance metrics follow the same pattern. Passmark G3D shows 20974 versus 15096, a 28% lead for the RX 7700. Passmark G2D shows 1206 versus 889, a 26.3% lead. The RX 7700's lower average benchmark score (15852) versus the RX 6600's (19036) is an artifact of incomplete test coverage: the RX 6600 has Geekbench Metal and Vulkan scores in the database, which the RX 7700 lacks, and those scores (88398 and 67623) inflate its average. The head-to-head results, where both cards share the same tests, are the reliable comparison.

# Specification Differences

The two cards differ in every major specification category. The RX 7700 uses the Navi 32 chip on RDNA 3.0, while the RX 6600 uses Navi 23 on RDNA 2.0. The process node shrinks from 7nm to 5nm, both from TSMC. Transistor count more than doubles, from 11,060 million to 28,100 million. Die size grows from 237 mm² to 346 mm², and transistor density rises from 46.7M/mm² to 81.2M/mm².

Clock speeds are similar at the top end: boost clocks are 2491 MHz (RX 6600) versus 2459 MHz (RX 7700). Base clocks differ more: 1626 MHz versus 1900 MHz. Game clocks are nearly identical: 2044 MHz versus 2041 MHz. Memory clocks differ significantly: 1750 MHz (14 Gbps effective) versus 2438 MHz (19.5 Gbps effective).

Memory capacity doubles from 8 GB to 16 GB. Bus width doubles from 128-bit to 256-bit. Bandwidth nearly triples, from 224.0 GB/s to 624.1 GB/s. Shading units increase from 1792 to 2560. TMUs increase from 112 to 160. ROPs increase from 64 to 96. RT cores increase from 28 to 40.

Rates and throughput all favor the RX 7700: pixel rate goes from 159.4 GPixel/s to 236.1 GPixel/s, texture rate from 279.0 GTexel/s to 393.4 GTexel/s, and FP32 from 8.928 TFLOPS to 25.18 TFLOPS. FP16 changes from 17.86 TFLOPS (2:1) to 25.18 TFLOPS (1:1).

Power and physical specs differ as well. TDP rises from 132 W to 200 W. Power connectors change from 1x 8-pin to 2x 8-pin. Suggested PSU increases from 300 W to 550 W. The RX 6600 is 190 mm long, 110 mm tall, and 40 mm wide; the RX 7700 is 267 mm long, 135 mm tall, and 50 mm wide. Both are dual-slot cards. Bus interface changes from PCIe 4.0 x8 to PCIe 4.0 x16. Display outputs differ: the RX 6600 has 1x HDMI 2.1 and 3x DisplayPort 1.4a; the RX 7700 has 1x HDMI 2.1a, 2x DisplayPort 2.1, and 1x USB Type-C. Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The RX 6600 launched with a 329 USD MSRP; the RX 7700 has no recorded MSRP.