AMD Radeon 660M vs AMD Radeon RX 7600M XT Comparison

The AMD Radeon RX 7600M XT and AMD Radeon 660M represent two distinct philosophies in mobile graphics: one is a dedicated, high-power discrete GPU, while the other is an integrated graphics processor. Benchmark data shows a stark performance chasm between them, with the RX 7600M XT dominating dedicated compute tests, yet the 660M holds a surprising edge in aggregate scoring due to the limited overlap of test suites. This analysis breaks down the numbers, the architectural reasons behind them, and which user profile aligns with each chip.

Head-to-Head Benchmarks

The only two benchmark tests where both GPUs have comparable data are Geekbench’s OpenCL and Vulkan compute workloads. In these, the RX 7600M XT delivers a crushing blow. In Geekbench OpenCL, the 7600M XT scores 74,869 points against the 660M’s 12,876 points. That is a delta of 481.5%, meaning the discrete GPU is nearly five times faster in raw compute throughput. This is not a marginal gap; it is a generational chasm in execution resources.

The Vulkan test tells a similar, though less extreme, story. The RX 7600M XT posts 27,793 points, while the 660M manages 14,748 points. The delta here is 88.5%, meaning the 7600M XT is roughly 1.9 times faster. While less dramatic than OpenCL, this still represents a decisive victory for the discrete part. The data suggests that the 7600M XT’s higher shading unit count (2048 vs. 384) and dedicated memory bandwidth provide an insurmountable advantage in these synthetic workloads.

However, the aggregate benchmark picture is more nuanced. The RX 7600M XT has an average benchmark score of 12,710, while the 660M averages 13,812. This is a reversal of the head-to-head results. The reason is that the 660M’s average is calculated from only two tests (Geekbench OpenCL and Vulkan), which are compute-heavy but not representative of full graphics workloads. The 7600M XT’s average includes ten tests, many of which (like PassMark DirectX 9, 10, 11, and 12) are legacy or specific rasterization tasks where its scores are surprisingly low (e.g., 175 in DX9, 137 in DX11, and 58 in DX12). These low scores drag its average down, despite its compute dominance.

Consequently, the percentile rankings reflect this oddity. The 660M sits at the 55th percentile of all GPUs, while the 7600M XT sits at the 52nd percentile. This indicates that, based on the available benchmark set, the integrated 660M has a higher aggregate standing than the dedicated 7600M XT. The nearest rivals for the 7600M XT confirm its middling position: it is just 0.5% behind the NVIDIA GeForce GTX 670 (12,773), 0.7% ahead of the NVIDIA Tesla K20Xm (12,625), and 0.9% behind both the GeForce GTX 590 (12,830) and the AMD Radeon Pro 455 (12,831). The 660M, by contrast, sits within a stone’s throw of the NVIDIA RTX A2000 Mobile (13,821) and the AMD Radeon RX 570X (13,871), while being 0.5% ahead of the AMD Radeon RX 7900 XT (13,745).

The Verdict

From the data, the RX 7600M XT is the unequivocal winner for any task that relies on sustained, heavy compute throughput. Its 481.5% lead in OpenCL and 88.5% lead in Vulkan are decisive. If a workload is built on these APIs, the 7600M XT is the only choice between the two. The 660M, however, should not be dismissed solely on those numbers. Its aggregate score and higher percentile suggest that in the broader, mixed workload landscape, it holds up surprisingly well.

The verdict leans on what the benchmark suite measures. For modern gaming or professional 3D rendering that leverages Vulkan or OpenCL, the RX 7600M XT is vastly superior. For a system where the GPU is a secondary component and the primary concern is general compute with low power draw, the 660M’s data is more favorable. The average scores indicate that the 660M is not a slouch; it is competitive with dedicated GPUs from a previous generation, such as the Radeon RX 570X. The 7600M XT, despite its raw power, is hamstrung in the aggregate by poor legacy DirectX 9/10/11 scores, suggesting driver or architectural inefficiencies in those older APIs.

Where Each One Wins

The RX 7600M XT wins decisively in raw compute benchmarks. Its 20.23 TFLOPS of FP32 performance, compared to the 660M’s 1,459.2 GFLOPS, is a massive advantage. This translates directly to wins in Geekbench OpenCL and Vulkan. Any application that scales with shading units—such as 3D rendering, scientific simulation, or heavy video processing—will see a massive performance uplift on the 7600M XT. It also has 32 ray tracing cores versus the 660M’s 6, making it more capable for ray-traced workloads, though no direct benchmark here validates that.

The 660M wins in the aggregate benchmark category. Its average score of 13,812 is higher than the 7600M XT’s 12,710. This is because the 660M’s score is based solely on its two strong compute results, while the 7600M XT’s average is dragged down by its weak PassMark DirectX scores. In the PassMark G3D test, the 7600M XT scores 13,907, which is strong, but its DirectX 9 score of 175, DirectX 10 score of 76, and DirectX 12 score of 58 are abysmal. This suggests the 7600M XT is a poor choice for older DirectX titles, while the 660M, with no such legacy test data, avoids this penalty. Furthermore, the 660M has a much lower TDP of 40 W versus 120 W, making it the clear winner for power-constrained, thin-and-light laptops where battery life is paramount.

FAQ

Q: Which GPU is faster in Geekbench OpenCL?

A: The AMD Radeon RX 7600M XT is significantly faster, scoring 74,869 points compared to the AMD Radeon 660M’s 12,876 points, a delta of 481.5%.

Q: Does the AMD Radeon 660M have a higher average benchmark score than the RX 7600M XT?

A: Yes. The 660M has an average benchmark score of 13,812, while the RX 7600M XT has an average of 12,710. The 660M also holds a higher percentile rank at 55th, versus the 7600M XT’s 52nd.

Q: What is the difference in their shading unit counts?

A: The RX 7600M XT has 2,048 shading units, while the Radeon 660M has only 384. This is a 5.3x difference in raw shader count.

Q: Which GPU has a higher FP32 performance rating?

A: The RX 7600M XT is rated for 20.23 TFLOPS of FP32 performance, whereas the Radeon 660M is rated for 1,459.2 GFLOPS (approximately 1.46 TFLOPS).

Q: How does the RX 7600M XT compare to the NVIDIA GeForce GTX 670?

A: According to the data, the RX 7600M XT has an average score of 12,710, which is 0.5% lower than the GeForce GTX 670’s average score of 12,773.

Q: What is the production status of each GPU?

A: The AMD Radeon RX 7600M XT is listed as "Active" in production, while the AMD Radeon 660M is listed as "End-of-life".

Architecture Differences

The two GPUs are built on fundamentally different architectures and physical designs. The RX 7600M XT uses the Navi 33 chip, which is based on the RDNA 3.0 architecture, with the codename "Hotpink Bonefish." It is a discrete GPU manufactured on a 6 nm process at TSMC, containing 13,300 million transistors on a 204 mm² die. The Radeon 660M, in contrast, uses the Rembrandt chip, based on the older RDNA 2.0 architecture. It is an integrated graphics processor (IGP) built on the same 6 nm TSMC process, with 13,100 million transistors on a slightly larger 208 mm² die.

The transistor density is similar, with the RX 7600M XT at 65.2M transistors per mm² and the 660M at 63.0M per mm². However, the key difference lies in how those transistors are used. The RX 7600M XT dedicates its resources to graphics, featuring 2,048 shading units, 128 TMUs, 64 ROPs, and 32 ray tracing cores. The 660M, as an IGP, shares its silicon with CPU cores, offering only 384 shading units, 24 TMUs, 16 ROPs, and 6 ray tracing cores.

Memory architecture is another critical divergence. The RX 7600M XT has 8 GB of dedicated GDDR6 memory on a 128-bit bus, delivering 288.0 GB/s of bandwidth. The 660M uses "System Shared" memory, meaning its bandwidth is "System Dependent" and relies on the system’s main RAM. This gives the discrete GPU a massive advantage in memory-intensive tasks. Clock speeds also differ: the RX 7600M XT has a base of 1280 MHz and a boost of 2469 MHz, while the 660M has a higher base of 1500 MHz but a lower boost of 1900 MHz. The RX 7600M XT also has a dedicated "game" clock of 2023 MHz, a feature the 660M lacks.

Power consumption is a major differentiator. The RX 7600M XT has a TDP of 120 W, while the 660M is rated at just 40 W. This reflects the 7600M XT’s role as a high-performance discrete part, requiring substantial cooling and power delivery, whereas the 660M is designed for efficiency in integrated systems. Both support PCIe 4.0, but the RX 7600M XT uses a x16 interface, while the 660M uses a x8 interface. They both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, but the underlying silicon and memory subsystem make them entirely different classes of hardware.