AMD Radeon HD 7970 vs AMD Radeon PRO W6400 Comparison

The AMD Radeon PRO W6400 and the AMD Radeon HD 7970 represent two distinct eras of GPU design, with the data showing a narrow victory for the modern card. In the single head-to-head benchmark available, the Radeon PRO W6400 edges out the HD 7970, yet the specifications reveal a fundamental clash between architectural efficiency and raw, legacy compute resources.

FAQ

Q: Which GPU has the higher average benchmark score?

A: The AMD Radeon PRO W6400 has a higher average benchmark score of 37157, compared to 34541 for the AMD Radeon HD 7970.

Q: How do the two cards compare in the Geekbench OpenCL test?

A: The Radeon PRO W6400 wins the Geekbench OpenCL test with a score of 35027, achieving a 1.4% delta over the HD 7970's score of 34541.

Q: What is the performance percentile ranking for each card?

A: The Radeon PRO W6400 sits at the 80th percentile among all GPUs, while the Radeon HD 7970 is at the 79th percentile.

Q: What are the key differences in memory specifications?

A: The Radeon PRO W6400 features 4 GB of GDDR6 memory on a 64-bit bus with 128.0 GB/s bandwidth, while the HD 7970 has 3 GB of GDDR5 on a 384-bit bus with 264.0 GB/s bandwidth.

Q: Which card has a higher transistor density?

A: The Radeon PRO W6400 has a significantly higher transistor density of 50.5M / mm², compared to 12.3M / mm² for the HD 7970.

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

A: The Radeon PRO W6400 has a 50 W TDP, whereas the Radeon HD 7970 has a 250 W TDP.

The Verdict

Based strictly on the benchmark data, the AMD Radeon PRO W6400 is the card to choose if you prioritize compute efficiency and modern features. Its victory in the Geekbench OpenCL test, albeit by a slim 1.4% margin, paired with its higher average benchmark score, makes it the more capable overall performer in this comparison. The data indicates that the W6400's architectural advancements in RDNA 2.0 deliver comparable performance to the older GCN 1.0 card while consuming far less power.

The Radeon HD 7970, however, should be considered if the workload heavily depends on raw memory bandwidth or sheer shading unit count. Its 384-bit memory bus provides 264.0 GB/s of bandwidth, more than double that of the W6400, which could be advantageous in specific bandwidth-sensitive tasks. However, its lower OpenCL score and older architecture make it a less balanced choice. For a modern system, the W6400 is the clear pick from the performance data, offering a more future-proof feature set with DirectX 12 Ultimate and Vulkan 1.4 support.

Head-to-Head Benchmarks

The only direct benchmark comparison available is the Geekbench OpenCL test, where the AMD Radeon PRO W6400 emerges as the winner with a score of 35027 against the HD 7970's 34541. This 1.4% delta is a narrow margin, but it is a definitive result in the data. The W6400's average benchmark score of 37157 further reinforces its lead, sitting nearly 7.6% above the HD 7970's 34541 average.

The HD 7970's closest rivals in the database include the NVIDIA T1000 8 GB, with a delta of -0.1%, and the NVIDIA A2, with a delta of -0.4%. This places the HD 7970 in a competitive position against modern low-profile professional cards, but it is still trailing the W6400. Conversely, the W6400's nearest rival, the AMD Radeon RX Vega 56, has an average score of 37507, placing the W6400 just 0.9% behind it, according to the deltaPct data. This suggests that while the W6400 wins this head-to-head, it is operating in a different performance class than its higher-end predecessors.

Specification Differences

The specification sheets for these two GPUs reveal stark generational contrasts. The Radeon PRO W6400 is built on a 6 nm process at TSMC, while the HD 7970 uses a 28 nm process, also from TSMC. The die size difference is substantial, with the W6400 measuring 107 mm² compared to the HD 7970's 352 mm². This leads to a massive difference in transistor density, with the W6400 packing 50.5M transistors per mm² versus the HD 7970's 12.3M per mm².

Clock speeds also differ significantly. The W6400 has a base clock of 2039 MHz and a boost clock of 2321 MHz, whereas the HD 7970 has no listed base or boost clocks. Memory configurations are divergent: the W6400 offers 4 GB of GDDR6 at 2000 MHz (16 Gbps effective), while the HD 7970 provides 3 GB of GDDR5 at 1375 MHz (5.5 Gbps effective). The bus widths and resulting bandwidths are also opposite in nature, with the W6400 using a 64-bit bus for 128.0 GB/s, and the HD 7970 using a 384-bit bus for 264.0 GB/s.

Power and physical requirements are a major differentiator. The W6400 has a 50 W TDP, is single-slot, and requires no power connectors, with a suggested PSU of 250 W. The HD 7970, in contrast, has a 250 W TDP, is dual-slot, requires a 6-pin and an 8-pin power connector, and needs a 600 W PSU. The HD 7970 is also a longer card at 275 mm, with dimensions of 111 mm height and 38 mm width, while the W6400's dimensions are not listed. The bus interface also differs, with the W6400 using PCIe 4.0 x4 and the HD 7970 using PCIe 3.0 x16.

Architecture Differences

The architectural divide between these two cards is fundamental. The Radeon PRO W6400 is based on the Navi 24 chip using RDNA 2.0 architecture, part of the Radeon Pro Navi (Navi II Series) generation. The Radeon HD 7970 uses the Tahiti chip with GCN 1.0 architecture, from the Southern Islands (HD 7900) generation. This represents a significant evolution in GPU design philosophy.

The W6400 has 768 shading units, 48 TMUs, and 32 ROPs, along with 12 dedicated ray tracing cores. The HD 7970, by contrast, has 2048 shading units, 128 TMUs, and 32 ROPs, but no ray tracing cores. Despite having fewer shading units, the W6400 achieves a higher pixel rate of 74.27 GPixel/s versus 29.60 GPixel/s for the HD 7970, and a comparable texture rate of 111.4 GTexel/s versus 118.4 GTexel/s. The FP32 performance is also close, with the W6400 at 3.565 TFLOPS and the HD 7970 at 3.789 TFLOPS.

The API support illustrates the generational leap. The W6400 supports DirectX 12 Ultimate (12_2) and Vulkan 1.4, while the HD 7970 supports DirectX 12 (11_1) and Vulkan 1.2.170. Both support OpenGL 4.6. The W6400 also features FP16 performance at 7.130 TFLOPS (2:1), a capability the HD 7970 lacks entirely. The display outputs also differ, with the W6400 offering 2x DisplayPort 1.4a, while the HD 7970 provides 1x DVI, 1x HDMI 1.4a, and 2x mini-DisplayPort 1.2.

Where Each One Wins

The AMD Radeon PRO W6400 wins in overall compute efficiency and modern workload support. Its victory in the Geekbench OpenCL test, combined with its higher average benchmark score, makes it the better choice for general-purpose compute tasks. The inclusion of ray tracing cores and support for DirectX 12 Ultimate gives it a clear advantage in any application leveraging those features. Its significantly lower TDP of 50 W means it can be deployed in systems with minimal power delivery, and its single-slot design with no power connectors allows for easier integration into compact or densely populated environments.

The AMD Radeon HD 7970 wins in raw memory bandwidth and legacy compute throughput. Its 264.0 GB/s of bandwidth is a major advantage over the W6400's 128.0 GB/s, which could be decisive in memory-bound applications that predate the modern architectures. The HD 7970 also has more shading units (2048 vs 768) and TMUs (128 vs 48), which can translate to better performance in certain older workloads that are heavily parallel but not optimized for RDNA 2.0. Its higher FP32 rating of 3.789 TFLOPS, though marginally above the W6400's 3.565 TFLOPS, indicates that it retains a slight edge in pure single-precision compute density.

In practical terms, the W6400 is the winner for any new deployment or software stack that utilizes current APIs. The HD 7970 is a card for specific, bandwidth-hungry legacy tasks where its 384-bit bus can be fully utilized, but its 250 W power draw and dual-slot requirement make it a less practical choice for modern systems. The benchmark data, with the W6400's single head-to-head win, ultimately points to the Radeon PRO W6400 as the more capable and versatile GPU.