AMD Radeon Pro 455 vs AMD Radeon RX 7600M XT Comparison

The AMD Radeon Pro 455 and the AMD Radeon RX 7600M XT represent two distinct eras of mobile graphics, separated by over six years of architectural evolution. The benchmark data reveals a stark performance chasm, yet both GPUs occupy the same overall performance percentile, a curious statistical anomaly that warrants deeper investigation. The Pro 455, a veteran from the GCN era, faces a formidable opponent in the RDNA 3-based RX 7600M XT, which delivers overwhelming raw speed but is held back by a surprisingly low average score in the database’s aggregate metrics.

Head-to-Head Benchmarks

The direct comparison between these two GPUs is anything but close. In the two shared benchmark tests, the RX 760M XT demonstrates a commanding lead that underscores the generational leap in compute capability. The most dramatic difference appears in the Geekbench OpenCL test, where the RX 7600M XT scores 74,869 against the Pro 455’s 10,336. This represents a delta of -86.2% from the perspective of the older card, meaning the RX 7600M XT is roughly seven times faster in this compute-heavy workload. This result highlights the massive increase in shader throughput and memory bandwidth that RDNA 3.0 brings to the table.

The gap narrows slightly in the Geekbench Vulkan test, but the outcome remains decisive. Here, the RX 7600M XT posts a score of 27,793, while the Pro 455 manages 12,240. The delta is -56%, indicating the newer GPU is more than double the performance of its predecessor in this API. This suggests that while the Pro 455 can handle Vulkan workloads, it does so with far less efficiency and brute force than the RX 7600M XT. The data shows a clean sweep: the RX 7600M XT wins 2 out of 2 head-to-head benchmarks, with the Pro 455 claiming 0 victories.

Despite this overwhelming defeat in direct comparison, the aggregate average benchmark scores tell a different story. The Pro 455 has an average score of 12,831, while the RX 7600M XT sits slightly lower at 12,710. This places both GPUs at the 52nd percentile among all GPUs in the database. The RX 7600M XT’s nearest rivals include the NVIDIA GeForce GTX 670 (delta -0.5%), the NVIDIA Tesla K20Xm (delta 0.7%), and the AMD Radeon Pro 455 itself (delta -0.9%). This implies that while the RX 7600M XT excels in specific modern benchmarks, its average performance is dragged down by other tests, possibly its low DirectX scores, which are not included in the head-to-head comparison.

FAQ

Q: Which GPU has the higher memory bandwidth?

A: The AMD Radeon RX 7600M XT has significantly higher memory bandwidth at 288.0 GB/s, compared to the Pro 455’s 81.28 GB/s. This is due to the newer GDDR6 memory type running at 18 Gbps effective, versus the older GDDR5 at 5.1 Gbps effective.

Q: What is the difference in raw shader processing power?

A: The RX 7600M XT is vastly more powerful in FP32 compute, rated at 20.23 TFLOPS, while the Pro 455 is rated at 1,313.3 GFLOPS (approximately 1.31 TFLOPS). This represents a roughly 15x advantage for the newer card.

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

A: No. The RX 7600M XT supports DirectX 12 Ultimate (12_2), while the Pro 455 is limited to DirectX 12 (12_0). This means the newer GPU can handle more advanced rendering features.

Q: Which GPU has more shading units and texture mapping units?

A: The RX 7600M XT has 2,048 shading units and 128 texture mapping units (TMUs), compared to the Pro 455’s 768 shading units and 48 TMUs. The RX 7600M XT also has 64 render output units (ROPs) versus 16 on the Pro 455.

Q: Are both GPUs compatible with the latest Vulkan API?

A: Yes, but with a difference. Both support Vulkan, but the RX 7600M XT supports Vulkan 1.4, while the Pro 455 supports Vulkan 1.3. The newer GPU offers a more recent API version.

Q: What is the power consumption difference between the two?

A: The RX 7600M XT has a TDP of 120 W, while the Pro 455 has a TDP of 35 W. The newer card consumes over three times the power, which is consistent with its substantially higher performance.

Architecture Differences

The architectural divide between these two GPUs is profound. The Pro 455 is built on GCN 4.0 architecture using the Baffin chip, manufactured on a 14 nm process at GlobalFoundries. It packs 3,000 million transistors on a 123 mm² die, yielding a transistor density of 24.4M / mm². In contrast, the RX 7600M XT uses the RDNA 3.0 architecture with the Navi 33 chip (codename “Hotpink Bonefish”), built on a 6 nm process at TSMC. This newer chip contains 13,300 million transistors on a 204 mm² die, achieving a significantly higher density of 65.2M / mm².

The memory subsystems are equally disparate. The Pro 455 uses 2 GB of GDDR5 memory on a 128-bit bus, while the RX 7600M XT has 8 GB of GDDR6 on the same 128-bit bus width. The effective memory speed difference is stark: 5.1 Gbps versus 18 Gbps, leading to the massive bandwidth advantage for the RX 7600M XT. Furthermore, the RX 7600M XT introduces 32 ray tracing cores, a feature entirely absent from the Pro 455, reflecting the later GPU’s focus on modern gaming features.

Clock speeds also tell a story of evolution. The Pro 455’s base and boost clocks are not listed in the data, but its memory clock is 1270 MHz. The RX 7600M XT has a base clock of 1280 MHz, a game clock of 2023 MHz, and a boost clock of 2469 MHz. The RX 7600M XT also supports FP16 at a 2:1 ratio (yielding 40.45 TFLOPS), whereas the Pro 455 is capped at a 1:1 ratio (1,313.3 GFLOPS). The bus interface also advanced, from PCIe 3.0 x8 on the Pro 455 to PCIe 4.0 x16 on the RX 7600M XT. Finally, the RX 7600M XT is part of the Radeon RX 7000 series, while the Pro 455 belongs to the Radeon Pro Mac (400 Series).

The Verdict

The data unequivocally favors the AMD Radeon RX 7600M XT in raw performance. Its victories in both OpenCL and Vulkan benchmarks, with deltas of -86.2% and -56% respectively, demonstrate a massive capability advantage. For any workload that leverages compute shaders, modern APIs, or high-resolution textures, the RX 7600M XT is the clear choice. Its 8 GB of VRAM and 288.0 GB/s bandwidth provide the headroom necessary for contemporary applications, whereas the Pro 455’s 2 GB frame buffer is a severe limitation.

However, the story is complicated by the aggregate average benchmark scores. Both GPUs sit at the 52nd percentile, and the Pro 455’s average score of 12,831 is actually higher than the RX 7600M XT’s 12,710. This suggests that in a broader set of legacy or less compute-intensive tests, the Pro 455 holds its own or even surpasses the newer card. The RX 7600M XT’s low scores in Passmark DirectX 10 (76), DirectX 11 (137), and DirectX 12 (58) are puzzling and drag down its average, indicating potential driver issues or thermal throttling in certain scenarios. Therefore, while the RX 7600M XT is the superior performer in modern, high-end tasks, the Pro 455 remains surprisingly competitive in the overall aggregate, evidence of the efficiency of its older architecture in specific workloads.

Specification Differences

The two GPUs differ across nearly every core specification. The process node moves from 14 nm to 6 nm, and the transistor count jumps from 3,000 million to 13,300 million. The die size increases from 123 mm² to 204 mm², and transistor density rises from 24.4M / mm² to 65.2M / mm². Memory size quadruples from 2 GB to 8 GB, and the type changes from GDDR5 to GDDR6. Effective memory speed increases from 5.1 Gbps to 18 Gbps, and bandwidth expands from 81.28 GB/s to 288.0 GB/s. Shading units grow from 768 to 2,048, TMUs from 48 to 128, and ROPs from 16 to 64. The RX 7600M XT adds 32 ray tracing cores, which the Pro 455 lacks entirely. Pixel rate jumps from 13.68 GPixel/s to 158.0 GPixel/s, and texture rate from 41.04 GTexel/s to 316.0 GTexel/s. FP32 performance goes from 1,313.3 GFLOPS to 20.23 TFLOPS, and FP16 from 1,313.3 GFLOPS to 40.45 TFLOPS. TDP increases from 35 W to 120 W. The bus interface changes from PCIe 3.0 x8 to PCIe 4.0 x16. DirectX support advances from 12 (12_0) to 12 Ultimate (12_2), and Vulkan from 1.3 to 1.4. The Pro 455 uses an MXM Module form factor, while the RX 7600M XT is an IGP. The production status shifts from End-of-life to Active.

Where Each One Wins

The AMD Radeon RX 7600M XT is the definitive winner in compute-heavy and modern graphics workloads. Its OpenCL score of 74,869 dwarfs the Pro 455’s 10,336, making it ideal for tasks like machine learning inference, video rendering, and scientific computation that leverage raw FP32 throughput. Its Vulkan score of 27,793 versus 12,240 also makes it the better choice for modern games and applications using that API. The 8 GB memory capacity and 288.0 GB/s bandwidth are critical for high-resolution textures and complex 3D scenes.

The AMD Radeon Pro 455, despite its losses, shows resilience in the aggregate. Its average benchmark score of 12,831 is slightly higher than the RX 7600M XT’s 12,710, and it matches the performance of rivals like the NVIDIA GeForce GTX 670 (delta 0.5%) and the AMD FirePro W5100 (delta -0.1%). This suggests it remains a viable option for legacy applications, older DirectX 11 titles, or tasks that do not require the latest API features. Its lower TDP of 35 W also makes it a more power-efficient choice for thin-and-light portable devices, whereas the 120 W TDP of the RX 7600M XT demands a more robust cooling solution and power delivery system.