AMD Radeon HD 8950M vs AMD Radeon Pro 455 Comparison

AMD Radeon HD 8950M and AMD Radeon Pro 455 are two end-of-life mobile graphics solutions from different architectural generations, and the benchmark data shows a clear split between compute workloads and API-specific performance. The HD 8950M, based on GCN 2.0, wins both shared head-to-head benchmarks, but the Pro 455 counters with a strong Metal result and significantly lower power draw. This analysis breaks down where each GPU earns its keep, the architectural gap between them, and what the numbers mean for real-world task selection.

Where Each One Wins

The data splits cleanly by workload type and API. The AMD Radeon HD 8950M wins the two benchmarks it shares with the Pro 455: Geekbench OpenCL and Geekbench Vulkan. In OpenCL, the HD 8950M scores 13,772 against the Pro 455’s 10,336, a 33.2% advantage. In Vulkan, the HD 8950M scores 12,979 versus 12,240, a 6% lead. If the task is general-purpose compute or Vulkan rendering, the older card is the stronger pick.

The AMD Radeon Pro 455 wins where the HD 8950M has no data: Geekbench Metal. It scores 15,916, which is higher than either of the HD 8950M’s results. Since the HD 8950M has no Metal benchmark score in the pack, the Pro 455 is the only option for Metal-accelerated workflows. Also, the Pro 455’s average benchmark score of 12,831 trails the HD 8950M’s 13,376, but the Pro 455 does so at a 35 W TDP versus 100 W. For thermally constrained laptops, that efficiency gap is decisive.

The wins are not equal in magnitude. The OpenCL gap is massive — 33.2% — while the Vulkan gap is modest at 6%. The Pro 455’s Metal score of 15,916 exceeds the HD 8950M’s Vulkan score by 22.6%, showing that API support matters more than raw hardware when the workloads diverge. The HD 8950M wins on raw compute throughput; the Pro 455 wins on API coverage and power efficiency.

Architecture Differences

The two GPUs come from different GCN generations, which explains most of the performance disparity. The HD 8950M uses GCN 2.0 on a 28 nm TSMC process, with a Saturn chip. The Pro 455 uses GCN 4.0 on a 14 nm GlobalFoundries process, with a Baffin chip. The process node shrink is significant: 28 nm to 14 nm, which allows the Pro 455 to pack 3,000 million transistors into a 123 mm² die, giving a transistor density of 24.4M per mm². The HD 8950M has 2,080 million transistors on a 160 mm² die, yielding 13.0M per mm². The Pro 455 nearly doubles the transistor density.

Core counts are identical on paper: both have 768 shading units, 48 texture mapping units, and 16 ROPs. But clock behavior differs. The HD 8950M’s memory runs at 1375 MHz (5.5 Gbps effective), while the Pro 455’s memory runs at 1270 MHz (5.1 Gbps effective). The HD 8950M’s memory bandwidth is 88.00 GB/s versus 81.28 GB/s for the Pro 455. Both use 2 GB of GDDR5 on a 128-bit bus.

The compute rates tell the story of architectural efficiency. The HD 8950M delivers 1.651 TFLOPS FP32, 17.20 GPixel/s pixel rate, and 51.60 GTexel/s texture rate. The Pro 455 delivers 1,313.3 GFLOPS FP32 (also 1,313.3 GFLOPS FP16 at 1:1 ratio), 13.68 GPixel/s, and 41.04 GTexel/s. Every throughput metric favors the HD 8950M by roughly 20-25%, which matches the OpenCL delta. The Pro 455’s advantage is power: 35 W versus 100 W TDP, and it requires no power connectors, whereas the HD 8950M’s power connectors are not listed.

API support differs in Vulkan version. The HD 8950M supports Vulkan 1.2.170, while the Pro 455 supports Vulkan 1.3. Both support DirectX 12 (12_0) and OpenGL 4.6. The Pro 455 also has FP16 support at 1:1 ratio, which the HD 8950M lacks (FP16 is null). The bus interface also differs: PCIe 3.0 x16 for the HD 8950M versus PCIe 3.0 x8 for the Pro 455.

Head-to-Head Benchmarks

The Geekbench OpenCL result is the defining gap between these two GPUs. The HD 8950M scores 13,772, and the Pro 455 scores 10,336. That’s a 33.2% delta, the largest margin in any shared test. The HD 8950M’s higher FP32 throughput (1.651 TFLOPS vs 1,313.3 GFLOPS) and higher memory bandwidth (88.00 GB/s vs 81.28 GB/s) directly explain this. The Pro 455’s newer architecture does not compensate for lower clocks and narrower bandwidth in this compute-heavy workload.

The Geekbench Vulkan result is closer. The HD 8950M scores 12,979, and the Pro 455 scores 12,240, a 6% delta. This smaller margin suggests that Vulkan performance is less sensitive to raw FP32 and more dependent on driver optimization and API implementation. The Pro 455’s newer Vulkan 1.3 support may narrow the gap versus the HD 8950M’s Vulkan 1.2.170. Still, the HD 8950M wins.

The Pro 455’s only benchmark victory is in Geekbench Metal, where it scores 15,916. This is 15.5% higher than the HD 8950M’s OpenCL score and 22.6% higher than its Vulkan score. No Metal data exists for the HD 8950M, so the comparison is one-sided. If the host system uses Metal for rendering or compute, the Pro 455 is the only viable option between the two.

Average benchmark scores confirm the overall picture. The HD 8950M averages 13,376 across its two tests, placing it in the 54th percentile of all GPUs. The Pro 455 averages 12,831 across three tests, placing it in the 52nd percentile. The HD 8950M’s nearest rivals include the AMD Radeon RX 5500M (13,356, +0.2%) and the AMD FirePro M6100 (13,354, +0.2%). The Pro 455’s nearest rivals include the NVIDIA GeForce GTX 590 (12,830, 0%) and the AMD FirePro W5100 (12,847, -0.1%). Both GPUs sit in a tightly packed midrange cluster.

FAQ

Q: Which GPU is faster in OpenCL compute?

A: The AMD Radeon HD 8950M is 33.2% faster in Geekbench OpenCL, scoring 13,772 versus the Pro 455’s 10,336.

Q: Does the AMD Radeon Pro 455 win any benchmark?

A: Yes. The Pro 455 scores 15,916 in Geekbench Metal, a test the HD 8950M does not have a result for. The Pro 455 also has a lower TDP of 35 W versus 100 W.

Q: How do the memory subsystems compare?

A: Both use 2 GB GDDR5 on a 128-bit bus. The HD 8950M runs memory at 1375 MHz (5.5 Gbps effective) for 88.00 GB/s bandwidth, while the Pro 455 runs at 1270 MHz (5.1 Gbps effective) for 81.28 GB/s.

Q: What is the transistor density difference?

A: The Pro 455 has a density of 24.4M transistors per mm² on a 123 mm² die, versus 13.0M per mm² on a 160 mm² die for the HD 8950M. The Pro 455 uses a 14 nm process; the HD 8950M uses 28 nm.

Q: Which GPU has better Vulkan API support?

A: The Pro 455 supports Vulkan 1.3, while the HD 8950M supports Vulkan 1.2.170. Despite this, the HD 8950M scores 6% higher in Geekbench Vulkan.

Q: Are the shading unit counts the same?

A: Yes, both have 768 shading units, 48 TMUs, and 16 ROPs. The HD 8950M still achieves higher texture rate (51.60 GTexel/s vs 41.04 GTexel/s) and pixel rate (17.20 GPixel/s vs 13.68 GPixel/s).

The Verdict

The data points to a clear split: the AMD Radeon HD 8950M is the compute and Vulkan performer, while the AMD Radeon Pro 455 is the Metal and efficiency choice. If the workload is OpenCL-heavy, the HD 8950M’s 33.2% lead makes it the obvious pick. Its higher FP32 (1.651 TFLOPS), memory bandwidth (88.00 GB/s), and texture rate (51.60 GTexel/s) all contribute to that margin. The Vulkan win is smaller at 6%, but it is still a win.

The Pro 455’s case rests on two pillars. First, Metal support: its 15,916 score is the highest single benchmark result in this comparison, and the HD 8950M has no Metal result at all. Second, power efficiency: 35 W versus 100 W TDP is a 65% reduction, which matters in thin-and-light laptops where the MXM module form factor is common. The Pro 455 also has newer architecture (GCN 4.0 on 14 nm), higher transistor density (24.4M/mm²), and Vulkan 1.3 support.

For users choosing between these two end-of-life parts, the decision hinges on the target API and thermal budget. The HD 8950M wins on raw compute performance and its 54th percentile ranking (versus 52nd for the Pro 455) reflects a higher average benchmark score of 13,376 versus 12,831. The Pro 455 is the better fit for Metal-exclusive pipelines and power-constrained systems. The HD 8950M is the better fit for maximum OpenCL and Vulkan throughput, provided the system can handle its 100 W draw. Neither GPU is a clear overall winner; the data supports picking based on workload, not brand loyalty.