AMD FirePro W4100 vs AMD Radeon HD 6950 Comparison

The AMD Radeon HD 6950 and AMD FirePro W4100 represent two very different philosophies from the same manufacturer, separated by nearly four years of GPU architecture evolution. The HD 6950 is a sprawling, power-hungry enthusiast card from the Northern Islands era, while the FirePro W4100 is a compact, efficient workstation solution built on the Graphics Core Next (GCN) architecture. Benchmark data shows that while the older card holds a lead in raw compute, the newer card brings modern API support and a vastly different physical footprint to the table.

Head-to-Head Benchmarks

The only directly comparable benchmark between the two cards is the Geekbench OpenCL test, which measures general-purpose compute performance. In this test, the AMD Radeon HD 6950 scores 6210 points, while the AMD FirePro W4100 scores 5478 points. This represents a 13.4% advantage for the HD 6950, making it the clear winner in this head-to-head comparison. The delta is significant enough to be noticeable in compute-heavy workloads, though it is far from a landslide victory.

The HD 6950’s advantage in OpenCL is rooted in its raw hardware specifications. With 1408 shading units, 88 texture mapping units (TMUs), and 32 raster operations pipelines (ROPs), it has substantially more parallel processing hardware than the W4100’s 512 shading units, 32 TMUs, and 16 ROPs. This translates to a peak FP32 throughput of 2.253 TFLOPS for the HD 6950 versus just 645.1 GFLOPS for the W4100. The HD 6950 also delivers a pixel rate of 25.60 GPixel/s and a texture rate of 70.40 GTexel/s, dwarfing the W4100’s 10.08 GPixel/s and 20.16 GTexel/s.

However, the W4100 has an additional benchmark result in its arsenal: a Geekbench Vulkan score of 6496. The HD 6950 has no Vulkan benchmark score listed, and its API support reflects this — it lacks Vulkan entirely, supporting only DirectX 11.2 (11_0) and OpenGL 4.4. The W4100, by contrast, supports Vulkan 1.2.170, DirectX 12 (11_1), and OpenGL 4.6. This means that in any Vulkan-based workload, the W4100 is the only contender; the HD 6950 cannot even participate. For users running modern applications that leverage Vulkan, this is a decisive factor that the raw OpenCL numbers do not capture.

When looking at the broader competitive landscape, both cards sit in similar percentile ranges. The HD 6950 has a percentile rank of 36 among all GPUs, with an average benchmark score of 6210. Its nearest rivals include the AMD FirePro W600 (average score 6223, delta -0.2%), the NVIDIA GeForce RTX 4070 Ti SUPER AD102 (6270, delta -0.9%), and the NVIDIA Quadro K620 (6282, delta -1.1%). The W4100 has a percentile rank of 34, with an average benchmark score of 5987. Its nearest rivals include the NVIDIA Quadro K4000M (5986, delta 0%), the NVIDIA Quadro K4000 (5982, delta 0.1%), and the NVIDIA RTX PRO 6000 Blackwell Server (5996, delta -0.2%). The data indicates that the HD 6950 sits slightly higher in overall performance ranking, but both cards are clustered in the lower-middle tier of the GPU performance spectrum.

The Verdict

The data presents a clear but nuanced picture. For pure OpenCL compute performance, the AMD Radeon HD 6950 is the superior card, delivering a 13.4% higher score. Its massive advantage in shading units, TMUs, ROPs, and memory bandwidth (160.0 GB/s versus 64.00 GB/s) makes it the better choice for any workload that relies on legacy compute APIs. Users running older applications or those that are optimized for OpenCL will find the HD 6950 noticeably faster.

However, the AMD FirePro W4100 is the only viable option for modern software ecosystems. Its support for Vulkan 1.2.170 and DirectX 12 means it can run contemporary applications that the HD 6950 simply cannot. The W4100 also offers better API coverage with OpenGL 4.6 versus the HD 6950’s 4.4. For professional users whose software stack has moved to Vulkan or DirectX 12, the HD 6950 is effectively obsolete despite its compute advantage.

Physical and power considerations also strongly favor the W4100. The W4100 has a TDP of 50 W and requires no external power connectors, drawing all its power from the PCIe slot. The HD 6950 has a TDP of 200 W and requires two 6-pin power connectors. The W4100 is a single-slot card measuring 171 mm in length, while the HD 6950 is a dual-slot card measuring 286 mm. The W4100 is also compatible with PCIe 3.0 x16, while the HD 6950 is limited to PCIe 2.0 x16. In any system where space, power, or modern connectivity are at a premium, the W4100 is the practical choice.

In summary, the HD 6950 wins on raw compute benchmarks, but the W4100 wins on compatibility, efficiency, and modern feature support. The choice depends entirely on the user’s workload: legacy compute tasks favor the HD 6950, while modern applications and constrained systems favor the W4100.

FAQ

Q: Which card has a higher Geekbench OpenCL score?

A: The AMD Radeon HD 6950 scores 6210, which is 13.4% higher than the AMD FirePro W4100’s score of 5478.

Q: Does the AMD FirePro W4100 support Vulkan?

A: Yes, the W4100 supports Vulkan version 1.2.170. The HD 6950 does not have any Vulkan support listed in its specifications.

Q: What is the difference in TDP between the two cards?

A: The AMD Radeon HD 6950 has a TDP of 200 W, while the AMD FirePro W4100 has a TDP of 50 W. The W4100 requires no external power connectors, whereas the HD 6950 requires two 6-pin connectors.

Q: How do the two cards compare in terms of physical size?

A: The HD 6950 is a dual-slot card measuring 286 mm in length, 126 mm in height, and 42 mm in width. The W4100 is a single-slot card measuring 171 mm in length and 69 mm in height, with no width listed.

Q: Which card has a higher FP32 performance?

A: The AMD Radeon HD 6950 has an FP32 performance of 2.253 TFLOPS, which is significantly higher than the AMD FirePro W4100’s 645.1 GFLOPS.

Q: What is the memory bandwidth of each card?

A: The HD 6950 has a memory bandwidth of 160.0 GB/s, while the W4100 has a memory bandwidth of 64.00 GB/s. Both cards have 2 GB of GDDR5 memory, but the HD 6950 uses a 256-bit bus versus the W4100’s 128-bit bus.

Specification Differences

The two cards differ significantly in nearly every hardware specification. The AMD Radeon HD 6950 is built on a 40 nm process with 2,640 million transistors on a 389 mm² die, giving a transistor density of 6.8M / mm². The AMD FirePro W4100 uses a 28 nm process with 1,500 million transistors on a much smaller 123 mm² die, achieving a higher transistor density of 12.2M / mm².

Memory specifications differ substantially. The HD 6950 features memory clocked at 1250 MHz (5 Gbps effective), while the W4100’s memory runs at 1000 MHz (4 Gbps effective). The HD 6950 has a 256-bit memory bus with 160.0 GB/s bandwidth, while the W4100 has a 128-bit bus with 64.00 GB/s bandwidth. Both cards have 2 GB of GDDR5 memory.

Compute unit counts are dramatically different. The HD 6950 has 1408 shading units, 88 TMUs, and 32 ROPs. The W4100 has 512 shading units, 32 TMUs, and 16 ROPs. This leads to the HD 6950’s pixel rate of 25.60 GPixel/s and texture rate of 70.40 GTexel/s, versus the W4100’s 10.08 GPixel/s and 20.16 GTexel/s. FP32 performance is 2.253 TFLOPS for the HD 6950 and 645.1 GFLOPS for the W4100.

Physical and power specifications are also divergent. The HD 6950 has a TDP of 200 W, is dual-slot, requires two 6-pin power connectors, and has a suggested PSU of 550 W. The W4100 has a TDP of 50 W, is single-slot, requires no power connectors, and has a suggested PSU of 250 W. The HD 6950 uses PCIe 2.0 x16, while the W4100 uses PCIe 3.0 x16. Display outputs differ as well: the HD 6950 has 2x DVI, 1x HDMI 1.4a, and 2x mini-DisplayPort 1.2, while the W4100 has 4x mini-DisplayPort 1.2.

Architecture Differences

The architectural divide between these two cards is generational. The AMD Radeon HD 6950 uses the Cayman chip based on the TeraScale 3 architecture, belonging to the Northern Islands (HD 6900) generation. Its predecessor is Evergreen, and its successor is Southern Islands. The AMD FirePro W4100 uses the Cape Verde chip based on the GCN 1.0 architecture, belonging to the FirePro GCN (Wx100) generation. Its predecessor is FirePro Terascale, and its successor is Radeon Pro Polaris.

The process node difference is significant: the HD 6950 uses a 40 nm process, while the W4100 uses a 28 nm process. Both are fabricated by TSMC. The HD 6950 has a much larger die (389 mm²) with more transistors (2,640 million), but the W4100 achieves higher transistor density (12.2M / mm² versus 6.8M / mm²) due to its smaller 123 mm² die.

API support reflects the architectural evolution. The HD 6950 supports DirectX 11.2 (11_0) and OpenGL 4.4, with no Vulkan support. The W4100 supports DirectX 12 (11_1), OpenGL 4.6, and Vulkan 1.2.170. The W4100’s GCN architecture was designed with modern compute workloads in mind, which is reflected in its broader API compatibility despite lower raw throughput.

The release timeline shows the HD 6950 launched on December 13, 2010, with a launch MSRP of 299 USD. The W4100 launched on August 12, 2014, with no launch MSRP listed. Both cards are now end-of-life products, but the architectural differences mean they serve very different use cases in the modern era. The HD 6950 is a brute-force compute card constrained to older APIs, while the W4100 is a versatile, low-power workstation card capable of running contemporary software stacks.