AMD Radeon Pro W6800X vs AMD Radeon Pro W6900X Comparison

The AMD Radeon Pro W6900X and AMD Radeon Pro W6800X are two workstation-class GPUs built on the same Navi 21 chip and RDNA 2.0 architecture, aimed at the Apple Mac Pro ecosystem. The data shows the W6900X is the clear performance leader, winning both head-to-head benchmarks, but the W6800X holds its own in specific workloads and offers a different power profile. Benchmark results indicate that the W6900X delivers a 15.2% advantage in Geekbench Metal and a 4.4% advantage in Geekbench OpenCL, making it the stronger choice for compute-heavy tasks, while the W6800X remains a highly capable option with a significantly lower power draw.

The Verdict

From the data, the AMD Radeon Pro W6900X is the pick for users who need maximum compute throughput in Metal-accelerated applications. Its Geekbench Metal score of 226,821 puts it 15.2% ahead of the W6800X’s 196,844, which is a substantial gap for rendering or machine-learning workloads that leverage Apple’s Metal API. The W6900X also leads in OpenCL, scoring 130,035 versus 124,498, a 4.4% edge that confirms its superiority in cross-platform compute. If your workflow is dominated by Metal-based software, the W6900X’s higher shading unit count and clock speeds translate directly into faster scene manipulation and simulation times.

The AMD Radeon Pro W6800X, however, is the more sensible choice for users whose primary concern is system integration and power efficiency. It draws 200 W compared to the W6900X’s 300 W, and its suggested PSU is 550 W versus 700 W. This makes it easier to fit into existing Mac Pro configurations without upgrading power delivery. While it trails in raw performance, its average benchmark score of 160,671 is only 4.7% behind the W6900X’s 168,574, meaning real-world differences in less demanding tasks will be minor. For mixed workloads that aren’t purely Metal-bound, the W6800X offers nearly all the capability at two-thirds the power draw.

Both cards share the same 32 GB GDDR6 memory, 256-bit bus, and 512.0 GB/s bandwidth, so memory capacity is not a differentiator. The verdict is straightforward: choose the W6900X for absolute performance in Metal and OpenCL, or the W6800X for a balanced, lower-power solution that still ranks in the 97th percentile of all GPUs. The W6800X’s 97th percentile ranking matches the W6900X, indicating both are elite-level workstation parts.

Architecture Differences

Both GPUs are built on the same Navi 21 chip, using TSMC’s 7 nm process node, with identical transistor counts of 26,800 million and a die size of 520 mm². This means the fundamental architecture is identical, but AMD has made significant cuts to the W6800X’s compute resources. The W6900X features 5,120 shading units, 320 texture mapping units (TMUs), and 128 raster operation units (ROPs), while the W6800X has 3,840 shading units, 240 TMUs, and 96 ROPs. This represents a 25% reduction in shading units, TMUs, and ROPs, which directly explains the performance gap.

Ray tracing hardware also differs: the W6900X has 80 ray accelerators (RT cores), while the W6800X has 60, a 25% reduction that impacts ray-traced rendering performance. Neither card has tensor cores, so they rely on standard shader and RT hardware for compute tasks. The clock speeds are slightly higher on the W6900X, with a base clock of 1825 MHz and boost of 2171 MHz, versus 1800 MHz and 2087 MHz on the W6800X. This modest clock advantage compounds with the larger compute unit count.

The memory subsystem is identical: both have 32 GB of GDDR6, a 256-bit bus, and 512.0 GB/s bandwidth, with memory clocks at 2000 MHz or 16 Gbps effective. Both use the Apple MPX bus interface and feature the same display outputs: 1x HDMI 2.1 and 4x Thunderbolt. The W6800X is specified as a quad-slot card, while the W6900X’s slot width is not listed, but both have the same physical dimensions of 267 mm length and 120 mm height. Power delivery is the key difference, with the W6900X requiring 300 W TDP and a 700 W PSU, while the W6800X uses 200 W and a 550 W PSU.

Where Each One Wins

The W6900X wins decisively in Geekbench Metal, scoring 226,821 versus 196,844 for the W6800X, a 15.2% advantage. This is its strongest showing and indicates it is the better card for Metal-accelerated creative applications like video editing, 3D modeling, and final frame rendering. Its higher pixel rate of 277.9 GPixel/s and texture rate of 694.7 GTexel/s, compared to 200.4 GPixel/s and 500.9 GTexel/s on the W6800X, also suggest faster rasterization and texturing in viewport-heavy tasks. The W6900X’s FP32 performance of 22.23 TFLOPS versus 16.03 TFLOPS on the W6800X reinforces its compute dominance.

The W6800X wins in terms of power efficiency and system integration. It is a quad-slot card that draws 200 W, which is 33% less than the W6900X’s 300 W. This allows it to be used in more compact Mac Pro configurations with a 550 W PSU, whereas the W6900X requires a 700 W PSU. The W6800X’s average benchmark score of 160,671 is only 4.7% below the W6900X’s 168,574, so in OpenCL workloads where the delta is just 4.4%, the performance difference is barely noticeable. For users who prioritize lower heat output and power bills over peak performance, the W6800X is the better fit.

In specific benchmark comparisons, the W6900X’s nearest rivals include the NVIDIA RTX 4500 Ada Generation, which scores 166,094 (1.5% behind the W6900X), and the NVIDIA RTX A5500 at 165,217 (2% behind). The W6800X, by contrast, trails the same rivals: it is 3.3% behind the RTX 4500 Ada Generation and 2.8% behind the RTX A5500. This shows the W6900X is competitive with top NVIDIA workstation cards, while the W6800X sits slightly below them.

FAQ

Q: Which card has better Metal performance?

A: The AMD Radeon Pro W6900X has significantly better Metal performance, scoring 226,821 in Geekbench Metal versus 196,844 for the W6800X, a 15.2% advantage.

Q: Do both cards have the same memory capacity?

A: Yes, both cards feature 32 GB of GDDR6 memory with a 256-bit bus and 512.0 GB/s bandwidth, so memory capacity and bandwidth are identical.

Q: What is the power draw difference?

A: The W6900X has a TDP of 300 W and requires a 700 W PSU, while the W6800X has a TDP of 200 W and requires a 550 W PSU.

Q: Are these cards compatible with the same Mac Pro systems?

A: Both cards use the Apple MPX bus interface and have identical dimensions of 267 mm length and 120 mm height, but the W6800X is a quad-slot card. The W6900X’s slot width is not specified, but both should fit in MPX bays.

Q: How do these cards compare to NVIDIA workstation GPUs?

A: The W6900X is 1.5% ahead of the NVIDIA RTX 4500 Ada Generation and 2% ahead of the RTX A5500. The W6800X is 3.3% behind the RTX 4500 Ada Generation and 2.8% behind the RTX A5500.

Q: What is the launch MSRP of each card?

A: The AMD Radeon Pro W6900X has a launch MSRP of 5,999 USD, and the AMD Radeon Pro W6800X has a launch MSRP of 2,799 USD.

Head-to-Head Benchmarks

The most decisive benchmark is Geekbench Metal, where the W6900X scores 226,821 against the W6800X’s 196,844. This 15.2% delta is the largest in the comparison and highlights the W6900X’s superior shading unit count and clock speeds. In practical terms, this means Metal-based renderers will complete frames noticeably faster on the W6900X. The W6900X’s FP32 throughput of 22.23 TFLOPS versus 16.03 TFLOPS on the W6800X aligns with this, as does its pixel rate of 277.9 GPixel/s versus 200.4 GPixel/s.

In Geekbench OpenCL, the gap narrows considerably. The W6900X scores 130,035, while the W6800X scores 124,498, a difference of only 4.4%. This smaller delta suggests that OpenCL workloads are less sensitive to the W6900X’s extra compute units, possibly due to memory bandwidth becoming a bottleneck. Both cards share the same 512.0 GB/s bandwidth, so this is plausible. The W6900X’s texture rate of 694.7 GTexel/s versus 500.9 GTexel/s on the W6800X helps in texture-bound OpenCL tasks, but the overall performance gain is modest.

There are no benchmark wins for the W6800X in the head-to-head data; the W6900X wins both tests. However, the W6800X’s average benchmark score of 160,671 is within 4.7% of the W6900X’s 168,574, and its percentile ranking is identical at 97th. This means that in mixed workloads or less compute-intensive applications, the W6800X will deliver nearly the same experience as the W6900X, while drawing 100 W less power.

Specification Differences

The primary specification differences between the two cards are in compute resources and power. The W6900X has 5,120 shading units, 320 TMUs, 128 ROPs, and 80 RT cores, while the W6800X has 3,840 shading units, 240 TMUs, 96 ROPs, and 60 RT cores. This is a 25% reduction across all compute units on the W6800X. Clock speeds differ slightly: the W6900X runs at 1825 MHz base and 2171 MHz boost, while the W6800X runs at 1800 MHz base and 2087 MHz boost.

Pixel and texture rates scale accordingly: the W6900X achieves 277.9 GPixel/s and 694.7 GTexel/s, versus 200.4 GPixel/s and 500.9 GTexel/s on the W6800X. FP32 and FP16 performance also differ, with the W6900X delivering 22.23 TFLOPS and 44.46 TFLOPS (2:1), respectively, while the W6800X delivers 16.03 TFLOPS and 32.06 TFLOPS (2:1). TDP is a major differentiator: 300 W for the W6900X versus 200 W for the W6800X, and the suggested PSU differs at 700 W versus 550 W.

The W6800X is explicitly listed as a quad-slot card, while the W6900X has no slot width specified. Both cards share the same memory configuration (32 GB GDDR6, 256-bit bus, 512.0 GB/s bandwidth), the same Apple MPX bus interface, the same display outputs (1x HDMI 2.1, 4x Thunderbolt), and the same physical dimensions (267 mm length, 120 mm height). Launch MSRP is 5,999 USD for the W6900X and 2,799 USD for the W6800X, reflecting the W6900X’s higher compute capabilities. Both cards are end-of-life and were released on the same date.