AMD Radeon RX 6800 vs AMD Radeon RX 7900 GRE Comparison

The AMD Radeon RX 7900 GRE and AMD Radeon RX 6800 represent two distinct generations of AMD's Radeon lineup, with the newer RDNA 3.0 card facing off against the older RDNA 2.0 flagship-tier option. The benchmark data shows a decisive overall victory for the RX 7900 GRE, which claims 9 out of 10 head-to-head wins, yet the single loss reveals a notable quirk in API-specific performance. This analysis breaks down the raw scores, architectural shifts, and practical implications for each card based strictly on the supplied data.

Head-to-Head Benchmarks

The largest margin in the entire comparison appears in the Geekbench OpenCL test, where the RX 7900 GRE scores 175,758 against the RX 6800's 24,508. This translates to a staggering 617.1% delta, making it the single most lopsided result in the dataset. Such a gap suggests the newer architecture's compute pipeline is dramatically more efficient in this particular OpenCL workload, though the absolute numbers should be viewed as indicative of synthetic test behavior rather than real-world gaming performance.

In the 3DMark Steel Nomad DX12 test, the RX 7900 GRE delivers 4,814 points versus 3,188 for the RX 6800, a 51% advantage. This is a strong indicator of modern DirectX 12 gaming performance, where the newer card demonstrates a clear generational leap. The PassMark DirectX 11 test shows a similar pattern, with the RX 7900 GRE scoring 300 against 214, a 40.2% delta, while the DirectX 9 test yields 310 versus 257, a 20.6% edge for the newer card.

The RX 7900 GRE also wins the PassMark GPU Compute test with 15,016 points against 10,864, a 38.2% improvement, and the PassMark G3D test with 27,089 versus 22,067, a 22.8% delta. The DirectX 12 PassMark test shows a 20.2% lead (107 vs 89), and the DirectX 10 test shows a narrower 8.6% advantage (139 vs 128). Even the 2D-focused PassMark G2D test goes to the RX 7900 GRE, with 1,180 points versus 990, a 19.2% delta.

The sole win for the RX 6800 comes in the Geekbench Vulkan test, where it scores 115,107 against the RX 7900 GRE's 99,850. This represents a 13.3% deficit for the newer card, indicating that the RDNA 2.0 architecture retains a notable edge in certain Vulkan workloads. Interestingly, the RX 6800's average benchmark score sits at 30,095, while the RX 7900 GRE averages 32,456, a difference of roughly 7.8% in overall synthetic performance, though the head-to-head deltas vary widely by test.

Architecture Differences

The RX 7900 GRE is built on TSMC's 5 nm process node with the Navi 31 chip, codenamed Plum Bonito, under the RDNA 3.0 architecture. This places it in the Navi III (RX 7000) generation. The RX 6800, by contrast, uses TSMC's 7 nm process with the Navi 21 chip under RDNA 2.0, belonging to the Navi II (RX 6000) generation. The transistor counts reflect the process shrink: the RX 7900 GRE packs 57,700 million transistors on a 529 mm² die, yielding a density of 109.1 million transistors per mm², while the RX 6800 has 26,800 million transistors on a 520 mm² die, with a density of 51.5 million per mm².

Core configurations differ substantially. The RX 7900 GRE features 5,120 shading units, 320 texture mapping units, and 160 render output units, compared to the RX 6800's 3,840 shading units, 240 TMUs, and 96 ROPs. Ray tracing cores also increase from 60 on the RX 6800 to 80 on the RX 7900 GRE. Neither card has tensor cores, and both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Clock speeds tell a mixed story. The RX 6800 has a higher base clock at 1,700 MHz versus 1,287 MHz for the RX 7900 GRE, but the newer card's boost clock reaches 2,245 MHz against 2,105 MHz. The game clock is nearly identical, with the RX 7900 GRE at 1,880 MHz and the RX 6800 at 1,815 MHz. Memory clocks also differ: the RX 7900 GRE runs at 2,250 MHz (18 Gbps effective) while the RX 6800 runs at 2,000 MHz (16 Gbps effective), both using 16 GB of GDDR6 on a 256-bit bus. This yields a bandwidth advantage for the RX 7900 GRE at 576.0 GB/s versus 512.0 GB/s.

The RX 7900 GRE also features DisplayPort 2.1 outputs, while the RX 6800 is limited to DisplayPort 1.4a, a meaningful difference for high-refresh-rate and high-resolution monitors. Both cards use a dual-slot design with 2x 8-pin power connectors and a 600 W suggested PSU, though the TDP is slightly higher on the RX 7900 GRE at 260 W versus 250 W.

FAQ

Q: Which card wins the majority of benchmark comparisons?

A: The AMD Radeon RX 7900 GRE wins 9 out of 10 head-to-head benchmarks, with the only exception being the Geekbench Vulkan test where the RX 6800 takes a 13.3% lead.

Q: How large is the performance gap in the most demanding synthetic test?

A: In 3DMark Steel Nomad DX12, the RX 7900 GRE scores 4,814 versus 3,188 for the RX 6800, a 51% delta in favor of the newer card.

Q: Is there any test where the older RX 6800 outperforms the RX 7900 GRE?

A: Yes, specifically in Geekbench Vulkan, the RX 6800 scores 115,107 against the RX 7900 GRE's 99,850, a 13.3% advantage for the RDNA 2.0 card.

Q: What is the transistor density difference between the two architectures?

A: The RX 7900 GRE has a transistor density of 109.1 million per mm² on a 5 nm process, while the RX 6800 has 51.5 million per mm² on a 7 nm process, nearly a two-fold difference.

Q: Do both cards have the same memory capacity and bus width?

A: Yes, both feature 16 GB of GDDR6 memory on a 256-bit bus, but the RX 7900 GRE has higher effective memory speed at 18 Gbps versus 16 Gbps, resulting in 576.0 GB/s bandwidth versus 512.0 GB/s.

Q: What is the production status of each card?

A: The RX 7900 GRE is listed as Active, while the RX 6800 is marked as End-of-life. The RX 7900 GRE was released on 2023-07-26, while the RX 6800 came out on 2020-10-27.

Specification Differences

The following fields differ between the two cards based on the provided data:

• Process Node: 5 nm (RX 7900 GRE) vs 7 nm (RX 6800)
• Transistors: 57,700 million vs 26,800 million
• Die Size: 529 mm² vs 520 mm²
• Transistor Density: 109.1M / mm² vs 51.5M / mm²
• Base Clock: 1,287 MHz vs 1,700 MHz
• Boost Clock: 2,245 MHz vs 2,105 MHz
• Game Clock: 1,880 MHz vs 1,815 MHz
• Memory Clock: 2,250 MHz (18 Gbps effective) vs 2,000 MHz (16 Gbps effective)
• Memory Bandwidth: 576.0 GB/s vs 512.0 GB/s
• Shading Units: 5,120 vs 3,840
• TMUs: 320 vs 240
• ROPs: 160 vs 96
• RT Cores: 80 vs 60
• Pixel Rate: 359.2 GPixel/s vs 202.1 GPixel/s
• Texture Rate: 718.4 GTexel/s vs 505.2 GTexel/s
• FP32 Performance: 45.98 TFLOPS vs 16.17 TFLOPS
• FP16 Performance: 91.96 TFLOPS (2:1) vs 32.33 TFLOPS (2:1)
• TDP: 260 W vs 250 W
• Display Outputs: 1x HDMI 2.1a, 2x DisplayPort 2.1, 1x USB Type-C vs 1x HDMI 2.1, 2x DisplayPort 1.4a, 1x USB Type-C
• Dimensions: 276 mm x 110 mm x 51 mm vs 267 mm x 120 mm x 40 mm
• Production Status: Active vs End-of-life
• Release Date: 2023-07-26 vs 2020-10-27
• Launch MSRP: 549 USD vs 579 USD
• Architecture: RDNA 3.0 vs RDNA 2.0
• Generation: Navi III (RX 7000) vs Navi II (RX 6000)
• Codename: Plum Bonito vs null
• Chip: Navi 31 vs Navi 21

Where Each One Wins

The AMD Radeon RX 7900 GRE is the clear winner in the vast majority of workloads, dominating in DirectX 10, 11, and 12 tests, as well as in OpenCL compute and 2D performance. Its 51% lead in 3DMark Steel Nomad DX12 makes it the better choice for modern DirectX 12 gaming titles, while the 40.2% advantage in PassMark DirectX 11 suggests strong backward compatibility with older APIs. The 617.1% OpenCL margin points to exceptional compute throughput, which could benefit GPU-accelerated productivity tasks like rendering or machine learning inference, though the synthetic nature of Geekbench OpenCL warrants caution. The RX 7900 GRE also wins on bandwidth, with 576.0 GB/s versus 512.0 GB/s, and offers newer DisplayPort 2.1 outputs, making it the more future-proof option for high-refresh-rate displays.

The AMD Radeon RX 6800's single win in Geekbench Vulkan (115,107 vs 99,850) indicates a specific strength in Vulkan-based applications. This could translate to advantages in games or workloads that rely heavily on Vulkan, particularly those optimized for RDNA 2.0. The RX 6800 also has a higher base clock (1,700 MHz vs 1,287 MHz), which may offer better performance in lightly-threaded or latency-sensitive scenarios, though the RX 7900 GRE compensates with a higher boost clock. The RX 6800 is end-of-life, so it may appeal to buyers seeking legacy hardware, but its lower average benchmark score (30,095 vs 32,456) and smaller transistor count (26,800 million vs 57,700 million) suggest it is outclassed in most measurable ways. Ultimately, the RX 7900 GRE is the superior card for nearly all synthetic benchmarks, while the RX 6800 retains a niche advantage in Vulkan workloads that could matter for specific software ecosystems.