AMD Radeon HD 8950M vs AMD Radeon RX 580 Comparison

The AMD Radeon HD 8950M and the AMD Radeon RX 580 represent two distinct eras of GPU design, separated by four years and a full generational leap. The data shows that the RX 580, a desktop Polaris part, is in a completely different performance class than the mobile HD 8950M, with every head-to-head benchmark favoring the newer card by a massive margin. While both share the GCN architectural lineage, their differences in process node, chip scale, and memory subsystem are so pronounced that they define entirely different market segments.

FAQ

Q: How does the AMD Radeon HD 8950M compare to the AMD Radeon RX 580 in raw compute performance?

A: The RX 580 delivers 6.175 TFLOPS of FP32 performance, which is roughly 3.7 times the 1.651 TFLOPS offered by the HD 8950M. This massive gap in raw compute is reflected across all benchmark results.

Q: Which GPU has a higher memory bandwidth, and by how much?

A: The RX 580 has a 256-bit memory bus with 256.0 GB/s bandwidth, while the HD 8950M uses a 128-bit bus with 88.00 GB/s. The RX 580 provides 2.9 times the bandwidth, a critical factor for high-resolution textures and compute workloads.

Q: What is the difference in process node and transistor count?

A: The HD 8950M uses a 28 nm process at TSMC with 2,080 million transistors. The RX 580 is built on a 14 nm process at GlobalFoundries with 5,700 million transistors, which allows for significantly higher density (24.6M / mm² versus 13.0M / mm²).

Q: In the Geekbench Vulkan test, what is the performance delta between the two cards?

A: The RX 580 scores 45,173 in Geekbench Vulkan, while the HD 8950M scores 12,979. This results in a delta of -71.3% for the HD 8950M, meaning the RX 580 is roughly 3.5 times faster.

Q: Do both GPUs support the same API level?

A: Yes, both support DirectX 12 (12_0) and OpenGL 4.6. However, they differ in Vulkan support: the HD 8950M supports Vulkan 1.2.170, while the RX 580 supports the more recent Vulkan 1.3.

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

A: The HD 8950M has a TDP of 100 W, while the RX 580 has a TDP of 185 W. This makes the RX 580 nearly twice as power-hungry, consistent with its larger die and higher clock speeds.

Architecture Differences

The architectural gap between these two GPUs is substantial. The HD 8950M uses the Saturn chip based on GCN 2.0 architecture, a design from the Solar System generation. In contrast, the RX 580 uses the Polaris 20 chip based on GCN 4.0, representing the Polaris generation. This generational leap brought significant improvements in efficiency and feature support.

The most fundamental difference is the process node: the HD 8950M is fabricated on a 28 nm process at TSMC, while the RX 580 uses a 14 nm process at GlobalFoundries. This node shrink allows the RX 580 to pack 5,700 million transistors into a 232 mm² die, compared to the HD 8950M's 2,080 million transistors on a 160 mm² die. The transistor density nearly doubles, from 13.0M / mm² to 24.6M / mm², which explains how the RX 580 can offer dramatically higher performance without a proportional increase in physical size.

The compute resources are vastly different. The RX 580 has 2,304 shading units, 144 texture mapping units (TMUs), and 32 ROPs. The HD 8950M is equipped with only 768 shading units, 48 TMUs, and 16 ROPs. This means the RX 580 has exactly three times the shading units and TMUs, and double the ROPs. Consequently, the pixel rate jumps from 17.20 GPixel/s on the HD 8950M to 42.88 GPixel/s on the RX 580, and the texture rate leaps from 51.60 GTexel/s to 193.0 GTexel/s.

Clock speeds also differ significantly. The HD 8950M has no listed base or boost clock, only a memory clock of 1375 MHz (5.5 Gbps effective). The RX 580 runs at a 1257 MHz base clock and 1340 MHz boost clock, with memory at 2000 MHz (8 Gbps effective). The RX 580 also supports FP16 compute at a 1:1 ratio (6.175 TFLOPS), whereas the HD 8950M has no listed FP16 capability.

Head-to-Head Benchmarks

The benchmark data provides a clear and unambiguous picture of the performance hierarchy. Two common tests were run on both GPUs: Geekbench OpenCL and Geekbench Vulkan. In both instances, the RX 580 wins decisively.

In the Geekbench OpenCL test, the HD 8950M scores 13,772, while the RX 580 scores 37,453. This represents a delta of -63.2% for the HD 8950M, meaning the RX 580 is approximately 2.7 times faster. This test is a strong indicator of general-purpose compute performance, and the result aligns with the raw FP32 specifications: the RX 580's 6.175 TFLOPS versus the HD 8950M's 1.651 TFLOPS.

The Geekbench Vulkan test shows an even larger gap. The HD 8950M scores 12,979, while the RX 580 scores 45,173. The delta is -71.3%, meaning the RX 580 is roughly 3.5 times faster in this graphics API workload. This wider margin in Vulkan is notable because the RX 580 supports Vulkan 1.3, a more modern version than the HD 8950M's Vulkan 1.2.170 support, which may allow the newer card to leverage additional optimizations.

The RX 580 also has a broader benchmark suite with additional scores, including 45,235 in Geekbench Metal, 8,813 in Passmark G3D, and 3,488 in Passmark GPU Compute. The HD 8950M lacks these test results, but its two available scores place its average benchmark score at 13,376. The RX 580's average is 12,928, which is actually lower than the HD 8950M's average due to the inclusion of more varied tests in its dataset. However, this does not diminish the head-to-head results, which are unambiguous.

Specification Differences

The two cards differ across nearly every measurable specification. The HD 8950M is a mobile part using an MXM Module slot width, while the RX 580 is a desktop card with a Dual-slot design. The RX 580 requires a 1x 8-pin power connector and a 450 W suggested PSU, while the HD 8950M has no listed power connector requirements.

Memory configurations are starkly different: the HD 8950M has 2 GB of GDDR5 on a 128-bit bus, while the RX 580 has 8 GB of GDDR5 on a 256-bit bus. Memory bandwidth scales accordingly, from 88.00 GB/s to 256.0 GB/s. The RX 580 is also physically longer at 241 mm (9.5 inches), whereas the HD 8950M has no listed dimensions.

Display outputs differ as well. The RX 580 provides 1x HDMI 2.0b and 3x DisplayPort 1.4a, while the HD 8950M's outputs are listed as "Portable Device Dependent," reflecting its mobile nature. The RX 580 has a launch MSRP of 229 USD, while the HD 8950M has no listed launch MSRP.

Release dates are separated by roughly four years: the HD 8950M launched on May 13, 2013, and the RX 580 on April 17, 2017. Both are now end-of-life products. The HD 8950M's predecessor is London and successor is Gem System, while the RX 580's predecessor is Arctic Islands and successor is Vega.

The Verdict

The data presents a clear conclusion: the AMD Radeon RX 580 is the superior GPU in every measured head-to-head metric. It wins both available benchmarks with deltas of -63.2% and -71.3%, respectively. The RX 580 also offers substantially more memory (8 GB versus 2 GB), higher bandwidth, and greater compute throughput. Any user seeking general graphics performance should choose the RX 580 without hesitation.

However, the HD 8950M is not without its merits. Its 100 W TDP is nearly half that of the RX 580's 185 W, making it a more power-efficient option for thermally constrained environments. Its MXM Module form factor is designed for laptops and portable devices, whereas the RX 580 is a desktop-only dual-slot card. The HD 8950M's average benchmark score of 13,376 is actually 3.5% higher than the RX 580's 12,928, though this is due to differences in test selection rather than raw performance parity.

The choice between these two cards is fundamentally a choice between portability and performance. The RX 580 sits at the 53rd percentile of all GPUs, while the HD 8950M sits at the 54th percentile, indicating they are in a similar overall standing relative to their respective eras. But in direct comparison, the RX 580's architectural advantages in process node, compute units, and memory subsystem are decisive.

Where Each One Wins

The AMD Radeon RX 580 wins in all performance-focused scenarios. In Geekbench OpenCL, it is 63.2% faster than the HD 8950M, and in Geekbench Vulkan, it is 71.3% faster. The RX 580's 256.0 GB/s memory bandwidth and 6.175 TFLOPS FP32 performance make it suitable for demanding gaming at high resolutions and compute-heavy workloads. Its 8 GB of VRAM provides ample capacity for modern game textures, and its Vulkan 1.3 support ensures compatibility with the latest graphics APIs.

The AMD Radeon HD 8950M wins in scenarios where power consumption and form factor are paramount. Its 100 W TDP is 85 W lower than the RX 580's, making it a viable option for slim laptops and portable workstations where thermal dissipation is limited. The MXM Module design allows for upgradeability in compatible systems, and its 88.00 GB/s bandwidth is sufficient for older or less demanding titles. The HD 8950M's absence of a power connector requirement further simplifies installation in mobile chassis.

For users building a desktop system with access to a 450 W PSU, the RX 580 is the only logical choice. For users who need a GPU in a laptop form factor and cannot accommodate the RX 580's dual-slot, 241 mm length, the HD 8950M remains a functional, if dated, option. The data does not support any scenario where the HD 8950M outperforms the RX 580 in raw graphics processing, but its lower power draw and mobile form factor carve out a niche that the desktop RX 580 cannot fill.