AMD Radeon PRO W7700 vs AMD Radeon PRO W7900 Comparison

The Verdict

The data presents a clear, though nuanced, choice between these two AMD workstation GPUs. The AMD Radeon PRO W7700 and the AMD Radeon PRO W7900 are not in a simple linear hierarchy; they are specialized tools with distinct strengths. The benchmark results show a split decision: the W7700 wins the OpenCL test by a substantial 28.3% margin, while the W7900 counters with a 5.4% victory in the Vulkan test. This is not a case of one card being universally faster.

From a pure compute standpoint, the W7700 emerges as the surprising leader in the OpenCL workload, a result that contradicts its lower specifications. The W7900, however, holds the advantage in the Vulkan API, which often reflects different optimization paths. The average benchmark score across both tests tells a similar story of divergence: the W7700 scores 118,976, with a 95th percentile ranking among all GPUs, while the W7900 averages 110,725, ranking in the 94th percentile. Therefore, the choice depends entirely on the user's primary software and API. If the workload is heavily reliant on OpenCL, the data points decisively to the W7700; if Vulkan performance is the priority, the W7900 is the better choice.

The W7900 is also the undisputed choice for capacity-driven tasks. Its 48 GB of memory, 384-bit bus, and 864.0 GB/s of bandwidth dwarf the W7700's 16 GB, 256-bit setup with 576.0 GB/s. For professionals working with massive datasets, high-resolution textures, or multi-GPU rendering scenarios where memory is the primary constraint, the W7900's architecture is the only logical option. The verdict is not about which is "better" overall, but which is better for a specific, defined purpose.

Where Each One Wins

The AMD Radeon PRO W7700 wins in the compute-focused workload of OpenCL. Its benchmark score of 108,245 in the Geekbench OpenCL test is not just a small victory; it is a 28.3% lead over the W7900's score of 84,379. This is its primary and most significant area of dominance. This win is so large that it pulls the W7700's average benchmark score to 118,976, which is 8,251 points higher than the W7900's average of 110,725. This performance profile suggests that for applications leveraging the OpenCL API, the smaller card is surprisingly the more capable processor.

The AMD Radeon PRO W7900 wins in the Vulkan API. Its score of 137,070 in the Geekbench Vulkan test is 5.4% higher than the W7700's 129,706. While this margin is smaller than the W7700's OpenCL lead, it still represents a clear victory for the larger card in this specific API. The W7900 also wins on every specification related to memory capacity and bandwidth. With 48 GB of GDDR6 memory and 864.0 GB/s of bandwidth, it offers three times the VRAM and 50% more bandwidth than the W7700. This makes it the definitive winner for tasks that cannot fit within a 16 GB frame buffer.

Architecture Differences

Both GPUs are built on the same fundamental architecture, RDNA 3.0, and are fabricated on the same 5 nm process node at TSMC. However, they are fundamentally different chips. The W7700 uses the Navi 32 chip, while the W7900 uses the larger Navi 31 chip. This difference in chip size is reflected in the transistor counts and die sizes. The W7900's Navi 31 chip contains 57,700 million transistors on a 529 mm² die, while the W7700's Navi 32 has 28,100 million transistors on a 346 mm² die. This makes the W7900's chip nearly double the transistor count and significantly larger in physical area.

The compute resources scale accordingly. The W7900 has 6,144 shading units, 384 texture mapping units (TMUs), and 192 render output units (ROPs), which is exactly double the W7700's 3,072 shaders, 192 TMUs, and 96 ROPs. The ray tracing cores also double, from 48 on the W7700 to 96 on the W7900. This doubling of resources results in the W7900's higher theoretical peak performance, with 61.32 TFLOPS FP32 and 958.1 GTexel/s, compared to the W7700's 31.95 TFLOPS and 499.2 GTexel/s.

Memory architecture differs significantly as well. The W7900 uses a 384-bit memory bus to connect to its 48 GB of GDDR6, while the W7700 uses a narrower 256-bit bus for its 16 GB. This is the root cause of the bandwidth disparity mentioned earlier. Interestingly, the FP16 performance tells a story about the architectural focus. The W7700 achieves 63.90 TFLOPS FP16 via a 2:1 rate, while the W7900 achieves only 61.32 TFLOPS at a 1:1 rate. This suggests the W7700's architecture is more optimized for FP16 throughput relative to its FP32.

FAQ

Q: Which GPU has a higher average benchmark score?

A: The AMD Radeon PRO W7700 has a higher average benchmark score of 118,976, compared to the AMD Radeon PRO W7900's average of 110,725.

Q: Which GPU is better for OpenCL workloads?

A: The AMD Radeon PRO W7700 is significantly better, scoring 108,245 in Geekbench OpenCL, which is 28.3% higher than the W7900's score of 84,379.

Q: Which GPU has more memory and bandwidth?

A: The AMD Radeon PRO W7900 has 48 GB of GDDR6 memory on a 384-bit bus, providing 864.0 GB/s of bandwidth. This is three times the memory and 50% more bandwidth than the W7700's 16 GB and 576.0 GB/s.

Q: Are these GPUs based on the same architecture?

A: Yes, both the AMD Radeon PRO W7700 and the AMD Radeon PRO W7900 are based on the RDNA 3.0 architecture and are manufactured on a 5 nm process node at TSMC.

Q: What is the difference in their physical size?

A: The W7900 is a larger card, measuring 280 mm in length, 110 mm in height, and 51 mm in width, and it occupies a triple-slot form factor. The W7700 is smaller at 241 mm in length and 111 mm in height, occupying a dual-slot form factor.

Q: Which GPU has a higher launch MSRP?

A: The AMD Radeon PRO W7900 has a higher launch MSRP of 3,999 USD, while the AMD Radeon PRO W7700 has a launch MSRP of 999 USD.

Head-to-Head Benchmarks

The two available benchmark tests provide a fascinating head-to-head comparison. The most significant result is in the Geekbench OpenCL test. Here, the AMD Radeon PRO W7700 delivers a score of 108,245, decisively beating the AMD Radeon PRO W7900's score of 84,379. This is a 28.3% difference, a substantial margin that defies the expectations set by their specifications. This single result is the primary reason the W7700 has a higher average benchmark score.

The second test, Geekbench Vulkan, reverses the outcome. The AMD Radeon PRO W7900 scores 137,070, which is 5.4% higher than the W7700's score of 129,706. While the margin is smaller, it is a clear win for the W7900 in this API. The data shows a 7,364-point swing in favor of the W7900 in Vulkan, compared to a 23,866-point swing in favor of the W7700 in OpenCL. This indicates that the W7700's relative strength in OpenCL is far more pronounced than the W7900's strength in Vulkan. The head-to-head benchmark record is a tie, with one win for each card, but the magnitude of the wins is not equal.

Specification Differences

The specification sheets for these two cards highlight the fundamental differences in their design goals. The most glaring difference is in memory. The W7900 offers 48 GB of GDDR6 across a 384-bit bus, yielding 864.0 GB/s of bandwidth. The W7700 offers 16 GB of GDDR6 on a 256-bit bus, yielding 576.0 GB/s. This is a massive difference in capacity and throughput.

The compute resources are similarly doubled. The W7900 has 6,144 shading units, 384 TMUs, 192 ROPs, and 96 ray tracing cores. The W7700 has exactly half of each: 3,072 shading units, 192 TMUs, 96 ROPs, and 48 ray tracing cores. This leads to the W7900's higher peak performance figures: 61.32 TFLOPS FP32, 479.0 GPixel/s pixel rate, and 958.1 GTexel/s texture rate. The W7700, by comparison, has 31.95 TFLOPS FP32, 249.6 GPixel/s, and 499.2 GTexel/s.

The physical and power characteristics also differ. The W7900 is a triple-slot card with a 295 W TDP and requires two 8-pin power connectors and a 600 W power supply. The W7700 is a dual-slot card with a 190 W TDP, one 8-pin connector, and a 450 W suggested PSU. The W7900 is also longer, at 280 mm (11 inches), compared to the W7700's 241 mm (9.5 inches). The W7900 has a mix of display outputs, including three DisplayPort 2.1 and one mini-DisplayPort 2.1, while the W7700 has four standard DisplayPort 2.1 outputs. The base and boost clocks are also lower on the W7900, at 1760 MHz base and 2495 MHz boost, compared to the W7700's 1900 MHz base and 2600 MHz boost. Interestingly, the W7900's FP16 performance is 61.32 TFLOPS at a 1:1 ratio, whereas the W7700 achieves a higher 63.90 TFLOPS at a 2:1 ratio.