AMD Radeon HD 7970 vs AMD Radeon RX 6800 Comparison

Where Each One Wins

The benchmark data paints a strikingly lopsided picture, but the direction of the win is the opposite of what most builders would expect from a modern GPU versus a 2012 flagship. In the only direct head-to-head benchmark recorded, the GeekBench OpenCL test, the AMD Radeon HD 7970 defeats the AMD Radeon RX 6800 by a margin of 40.9%. The HD 7970 scores 34,541 points while the RX 6800 manages 24,508 points. That is a decisive victory for the older card, and it flips the usual narrative about generational progress.

However, this single benchmark does not tell the whole story. The RX 6800 holds wins in every other category that the database tracks, but those are not direct comparisons against the HD 7970. Instead, the RX 6800 shows its strengths across a broader suite of tests. In the GeekBench Metal test, the RX 6800 posts 153,635 points. In GeekBench Vulkan, it reaches 115,107 points. The HD 7970 has no recorded score for either of those APIs, so there is no direct comparison available.

For practical use-case splits, the data suggests a clear division. The HD 7970 wins in raw OpenCL compute workloads as measured by GeekBench, which means it is the stronger pick for legacy compute tasks that rely on that specific API path. The RX 6800, by contrast, dominates in modern graphics API benchmarks: its PassMark DirectX 11 score of 214 and DirectX 12 score of 89 represent its strongest graphics results, while its PassMark G3D score of 22,067 places it far ahead of what the HD 7970 can achieve in any recorded test. The RX 6800 also wins on modern feature support, with DirectX 12 Ultimate and Vulkan 1.4 support versus the HD 7970's DirectX 12 (11_1) and Vulkan 1.2.170.

Architecture Differences

The architectural gap between these two cards is enormous, and it explains most of the benchmark behavior. The HD 7970 is built on GCN 1.0, AMD's first-generation Graphics Core Next architecture, using the Tahiti chip. It is fabricated on a 28 nm process at TSMC, with 4,313 million transistors packed into a 352 mm² die. That yields a transistor density of 12.3 million transistors per square millimeter. The RX 6800 uses RDNA 2.0 with the Navi 21 chip, built on a 7 nm process at TSMC, with 26,800 million transistors on a 520 mm² die. Its transistor density is 51.5 million per square millimeter, more than four times higher.

The core configuration differs drastically. The HD 7970 has 2,048 shading units, 128 texture mapping units, and 32 ROPs. The RX 6800 nearly doubles the shading units to 3,840, has 240 TMUs, and triples the ROP count to 96. The RX 6800 also adds 60 ray tracing cores, a feature entirely absent from the HD 7970, which has no RT cores and no tensor cores. The RX 6800 does list FP16 performance at 32.33 TFLOPS with a 2:1 ratio, while the HD 7970 has no recorded FP16 capability.

The compute throughput figures reflect these changes. The HD 7970 delivers 3.789 TFLOPS of FP32 performance, a pixel rate of 29.60 GPixel/s, and a texture rate of 118.4 GTexel/s. The RX 6800 produces 16.17 TFLOPS of FP32, 202.1 GPixel/s, and 505.2 GTexel/s. In every raw throughput metric, the RX 6800 is between roughly 4.3 and 6.8 times faster. Yet the OpenCL benchmark result goes the other way, which points to driver maturity, API implementation differences, or workload characteristics favoring the older GCN architecture in that specific test.

Head-to-Head Benchmarks

The only recorded head-to-head benchmark is GeekBench OpenCL, and it is a blowout. The HD 7970 scores 34,541 points against the RX 6800's 24,508 points, a delta of 40.9% in favor of the older card. This is not a marginal difference; it is a massive gap that puts the HD 7970 in a different performance class for this workload. For context, the HD 7970's nearest rivals in the database are the NVIDIA T1000 8 GB at 34,561 points (0.1% ahead of the HD 7970), the NVIDIA A2 at 34,690 points (0.4% ahead), the NVIDIA TITAN V at 34,355 points (0.5% behind), and the NVIDIA RTX A1000 at 34,207 points (1% behind). The HD 7970 sits squarely among these modern professional and workstation cards in OpenCL compute, which is remarkable for a GPU released in the Southern Islands generation.

The RX 6800, by contrast, has no direct head-to-head wins in the database. Its nearest rivals in average benchmark score are the NVIDIA GeForce RTX 3070 Ti at 29,945 points (0.5% behind the RX 6800), the NVIDIA GeForce RTX 5070 Mobile at 29,928 points (0.6% behind), the NVIDIA GeForce RTX 2080 Ti at 29,783 points (1% behind), and the AMD Radeon RX 6700 at 30,433 points (1.1% ahead of the RX 6800). The RX 6800's average benchmark score is 30,095, placing it just above the RTX 3070 Ti and just below the RX 6700 in aggregate performance.

The RX 6800's individual benchmark results show its strengths in modern workloads. Its highest score is 153,635 in GeekBench Metal, followed by 115,107 in GeekBench Vulkan. Its PassMark G3D score is 22,067, and its PassMark GPU Compute score is 10,864. The DirectX tests show 257 in DirectX 9, 214 in DirectX 11, 128 in DirectX 10, and 89 in DirectX 12, with a 2D score of 990. These numbers indicate a card that performs best in compute-heavy modern APIs, while its OpenCL score lags significantly behind its other compute results.

Specification Differences

The two cards differ in nearly every specification that matters. The memory subsystem is a clear example. The HD 7970 has 3 GB of GDDR5 on a 384-bit bus, delivering 264.0 GB/s of bandwidth at 1375 MHz (5.5 Gbps effective). The RX 6800 has 16 GB of GDDR6 on a 256-bit bus, delivering 512.0 GB/s of bandwidth at 2000 MHz (16 Gbps effective). Despite having a narrower bus, the RX 6800 more than doubles the memory bandwidth thanks to faster memory technology.

Clock speeds show the process node advantage. The HD 7970 has no recorded base or boost clock, only a memory clock. The RX 6800 runs at 1700 MHz base, 1815 MHz game clock, and 2105 MHz boost clock. The RX 6800's boost clock is especially relevant because it is a stock figure, not an overclock, and it contributes to the card's high throughput.

The power requirements are identical in TDP: both cards are rated at 250 W, and both recommend a 600 W PSU. The power connectors differ, with the HD 7970 using 1x 6-pin plus 1x 8-pin, while the RX 6800 uses 2x 8-pin. Both are dual-slot cards, but dimensions vary slightly: the HD 7970 is 275 mm long, 111 mm tall, and 38 mm wide, while the RX 6800 is 267 mm long, 120 mm tall, and 40 mm wide. The RX 6800 is shorter but slightly taller and thicker.

The bus interface has moved from PCIe 3.0 x16 on the HD 7970 to PCIe 4.0 x16 on the RX 6800. Display outputs have also changed: the HD 7970 offers 1x DVI, 1x HDMI 1.4a, and 2x mini-DisplayPort 1.2, while the RX 6800 provides 1x HDMI 2.1, 2x DisplayPort 1.4a, and 1x USB Type-C. API support differs as well, with the RX 6800 supporting DirectX 12 Ultimate (12_2) versus the HD 7970's DirectX 12 (11_1), and Vulkan 1.4 versus 1.2.170. Both support OpenGL 4.6.

FAQ

Q: Which card wins in OpenCL compute?

A: The AMD Radeon HD 7970 wins decisively. In the GeekBench OpenCL test, it scores 34,541 points against the RX 6800's 24,508 points, a 40.9% advantage.

Q: How does the HD 7970 compare to its nearest rivals?

A: The HD 7970 is essentially tied with the NVIDIA T1000 8 GB (0.1% behind), the NVIDIA A2 (0.4% behind), and the NVIDIA TITAN V (0.5% ahead), while it beats the NVIDIA RTX A1000 by 1%.

Q: What is the RX 6800's best benchmark result?

A: Its highest recorded score is 153,635 points in GeekBench Metal. Its next best is 115,107 points in GeekBench Vulkan, followed by 22,067 points in PassMark G3D.

Q: Does the RX 6800 have ray tracing hardware?

A: Yes, the RX 6800 has 60 ray tracing cores. The HD 7970 has none, as it predates ray tracing hardware entirely.

Q: How much memory do the two cards have?

A: The HD 7970 has 3 GB of GDDR5 on a 384-bit bus with 264.0 GB/s bandwidth. The RX 6800 has 16 GB of GDDR6 on a 256-bit bus with 512.0 GB/s bandwidth.

Q: Are the power requirements different?

A: No, both cards are rated at 250 W TDP and both recommend a 600 W PSU. The HD 7970 uses 1x 6-pin plus 1x 8-pin connectors, while the RX 6800 uses 2x 8-pin.

The Verdict

The data presents a nuanced recommendation that depends entirely on workload. If the priority is OpenCL compute performance, the AMD Radeon HD 7970 is the clear winner. Its 34,541-point score in GeekBench OpenCL puts it 40.9% ahead of the RX 6800 and level with modern professional cards like the NVIDIA T1000 and A2. Anyone running legacy OpenCL workloads, or software that has not been optimized for RDNA 2's compute paths, should expect the 2012 card to outperform the 2020 card significantly.

For everything else, the RX 6800 is the obvious choice. It has 16 GB of memory versus 3 GB, more than double the memory bandwidth, and over four times the FP32 compute throughput. It supports modern APIs including DirectX 12 Ultimate and Vulkan 1.4, includes ray tracing cores, and delivers far higher scores in every other recorded benchmark. Its PassMark G3D score of 22,067 and GeekBench Vulkan score of 115,107 demonstrate capabilities that the HD 7970 cannot approach in any modern graphics workload.

The HD 7970's 79th percentile ranking among all GPUs versus the RX 6800's 75th percentile might seem counterintuitive, but it reflects the different benchmark mixes. The HD 7970's single OpenCL result is its only recorded data point, and it happens to be strong. The RX 6800's average of 30,095 across eleven benchmarks includes some weaker results that drag down its percentile. Builders should interpret this as a workload-specific situation: the HD 7970 is a specialist in one narrow compute area, while the RX 6800 is the general-purpose winner across the board.

The recommendation is straightforward. For modern gaming, content creation, or any DirectX 12 or Vulkan workload, pick the RX 6800 without hesitation. For legacy OpenCL compute tasks where the software stack favors GCN 1.0, the HD 7970 remains surprisingly competitive and even dominant. The HD 7970's launch MSRP was 549 USD, while the RX 6800 launched at 579 USD, but price should not be the deciding factor here. The deciding factor is which workload matters more, and the benchmark data makes that split unmistakably clear.