AMD Radeon Pro W6800X vs AMD Radeon RX 6600 LE Comparison

Head-to-Head Benchmarks

The database contains one directly comparable benchmark between these two AMD RDNA 2.0 parts: Geekbench OpenCL. In this test, the AMD Radeon Pro W6800X scores 124,498 against 69,229 for the AMD Radeon RX 6600 LE. That is a 79.8% delta in favor of the Pro W6800X, a decisive margin that places the two cards in entirely different performance tiers.

Contextualizing the Pro W6800X against its nearest rivals reinforces its standing. Its average benchmark score across all recorded tests is 160,671, which places it in the 97th percentile of all GPUs in the database. The closest competitors around that average include the NVIDIA A100 PCIe 40 GB at 162,504 (1.1% higher), the AMD Radeon PRO W7800 at 164,894 (2.6% higher), the NVIDIA RTX A5500 at 165,217 (2.8% higher), and the NVIDIA RTX 4500 Ada Generation at 166,094 (3.3% higher). The Pro W6800X trails all four, but the gaps are narrow, ranging from just over one to slightly over three percentage points. This indicates that the Pro W6800X sits in the upper echelon of workstation-class accelerators, trading blows with modern professional GPUs despite being an older product.

The RX 6600 LE, by contrast, holds an average benchmark score of 70,829, placing it in the 91st percentile. Its nearest rivals cluster much closer to its own score. The NVIDIA RTX A3000 Mobile averages 70,140 (1.0% higher), the NVIDIA Quadro P6000 averages 69,986 (1.2% higher), the AMD Radeon RX 6650M averages 71,768 (1.3% lower), and the AMD Radeon Pro WX 8200 averages 69,870 (1.4% higher). The RX 6600 LE essentially matches these cards within a narrow band of roughly plus or minus 1.4%. It is a mid-pack performer among mobile and older workstation parts, not a leader.

The single head-to-head OpenCL result is the only direct measurement available. The Pro W6800X wins that test outright, and the margin of 79.8% is consistent with the massive gap in raw compute resources between the two chips. The data does not include a Vulkan or Metal result for the Pro W6800X, nor does it include a Metal result for the RX 6600 LE, so no further direct comparisons can be drawn from the recorded measurements.

Architecture Differences

Both cards share the RDNA 2.0 architecture and are fabricated by TSMC on a 7 nm process, but they diverge sharply in physical scale and feature allocation. The Pro W6800X uses the Navi 21 chip with 26,800 million transistors on a 520 mm² die, yielding a transistor density of 51.5 million per square millimeter. The RX 6600 LE uses the Navi 23 chip with 11,060 million transistors on a 237 mm² die, yielding a transistor density of 46.7 million per square millimeter. The Pro W6800X die is more than twice the area and carries more than double the transistor count, which explains the large performance delta.

Compute unit composition differs significantly. The Pro W6800X carries 3,840 shading units, 240 texture mapping units, 96 render output units, and 60 ray accelerators. The RX 6600 LE carries 1,792 shading units, 112 texture mapping units, 64 render output units, and 28 ray accelerators. In every category, the Pro W6800X has roughly double the resources, with the render output count being the smallest relative gap at 96 versus 64.

Clock behavior also differs in a meaningful way. The Pro W6800X has a base clock of 1800 MHz and a boost clock of 2087 MHz. The RX 6600 LE has a lower base of 1626 MHz but a substantially higher boost of 2495 MHz, plus a game clock of 2045 MHz. The RX 6600 LE reaches higher peak frequencies, but the Pro W6800X compensates with far more execution units. The record shows that the Pro W6800X achieves a pixel rate of 200.4 GPixel/s and a texture rate of 500.9 GTexel/s, versus 159.7 GPixel/s and 279.4 GTexel/s for the RX 6600 LE. Floating-point throughput follows the same pattern: the Pro W6800X delivers 16.03 TFLOPS FP32 and 32.06 TFLOPS FP16 (2:1), while the RX 6600 LE delivers 8.942 TFLOPS FP32 and 17.88 TFLOPS FP16 (2:1).

Memory architecture is another major split. The Pro W6800X has 32 GB of GDDR6 on a 256-bit bus, with a memory clock of 2000 MHz (16 Gbps effective) and 512.0 GB/s of bandwidth. The RX 6600 LE has 8 GB of GDDR6 on a 128-bit bus, with a memory clock of 1750 MHz (14 Gbps effective) and 224.0 GB/s of bandwidth. The Pro W6800X offers four times the capacity and more than double the bandwidth. That is a critical distinction for large datasets, which the benchmark data reflects in the OpenCL result.

Power and physical design differ as well. The Pro W6800X has a TDP of 200 W, a suggested PSU of 550 W, and a quad-slot form factor with an Apple MPX power connector and Apple MPX bus interface. The RX 6600 LE has a TDP of 132 W, a suggested PSU of 300 W, a dual-slot form factor, a single 8-pin power connector, and a PCIe 4.0 x8 bus interface. The Pro W6800X measures 267 mm in length and 120 mm in height, while the RX 6600 LE measures 190 mm in length, 110 mm in height, and 40 mm in width. The Pro W6800X display output set includes one HDMI 2.1 and four Thunderbolt ports, whereas the RX 6600 LE offers one HDMI 2.1 and three DisplayPort 1.4a outputs.

The Pro W6800X belongs to the Radeon Pro Mac generation (Navi II series), while the RX 6600 LE belongs to the Navi II (RX 6000) series. The RX 6600 LE is listed as having a predecessor named Navi and a successor named Navi III, but the Pro W6800X lists no predecessor or successor. The Pro W6800X is end-of-life, while the RX 6600 LE remains active in production.

The Verdict

The data points to a clear separation of roles. The AMD Radeon Pro W6800X is the substantially faster card in the only direct benchmark recorded, winning Geekbench OpenCL by 79.8%. Its average score of 160,671 versus 70,829 for the RX 6600 LE means the Pro W6800X outperforms the RX 6600 LE by more than a factor of two across all recorded workloads. For compute-heavy tasks that stress FP32 throughput, memory bandwidth, or large memory capacity, the Pro W6800X is the only choice between these two.

However, the RX 6600 LE is not without merit in its own context. It slots into the 91st percentile of all GPUs, meaning it is above the median performer in the database. Its nearest rivals are within a tight 1.4% band, so it competes effectively against mobile workstation GPUs and older professional cards. For a user constrained by physical space, the RX 6600 LE is a dual-slot card at 190 mm length, whereas the Pro W6800X is a quad-slot card at 267 mm length with an Apple MPX interface. The RX 6600 LE also draws 132 W versus 200 W, and requires a 300 W PSU rather than 550 W.

The choice should be driven by workload scale and platform compatibility. If the task demands large memory footprints, the Pro W6800X with 32 GB is in a different class from the 8 GB RX 6600 LE. If the task is bounded by memory capacity or raw compute, the Pro W6800X wins outright in the recorded data. If the task is lighter, the RX 6600 LE offers adequate performance with lower power draw and a conventional PCIe slot interface. The benchmark data does not support the RX 6600 LE as a competitor to the Pro W6800X in raw performance; it only supports it as a reasonable lower-tier option for less demanding environments.

Specification Differences

The following fields differ between the two cards:

• Chip: Navi 21 (Pro W6800X) versus Navi 23 (RX 6600 LE)
• Generation: Radeon Pro Mac (Navi II Series) versus Navi II (RX 6000)
• Transistors: 26,800 million versus 11,060 million
• Die size: 520 mm² versus 237 mm²
• Transistor density: 51.5M / mm² versus 46.7M / mm²
• Base clock: 1800 MHz versus 1626 MHz
• Boost clock: 2087 MHz versus 2495 MHz
• Game clock: not specified versus 2045 MHz
• Memory clock: 2000 MHz (16 Gbps effective) versus 1750 MHz (14 Gbps effective)
• Memory size: 32 GB versus 8 GB
• Memory bus width: 256 bit versus 128 bit
• Memory bandwidth: 512.0 GB/s versus 224.0 GB/s
• Shading units: 3840 versus 1792
• Texture mapping units: 240 versus 112
• Render output units: 96 versus 64
• Ray accelerators: 60 versus 28
• Pixel rate: 200.4 GPixel/s versus 159.7 GPixel/s
• Texture rate: 500.9 GTexel/s versus 279.4 GTexel/s
• FP32 performance: 16.03 TFLOPS versus 8.942 TFLOPS
• FP16 performance: 32.06 TFLOPS (2:1) versus 17.88 TFLOPS (2:1)
• TDP: 200 W versus 132 W
• Slot width: Quad-slot versus Dual-slot
• Power connectors: Apple MPX versus 1x 8-pin
• Suggested PSU: 550 W versus 300 W
• Bus interface: Apple MPX versus PCIe 4.0 x8
• Display outputs: 1x HDMI 2.1, 4x Thunderbolt versus 1x HDMI 2.1, 3x DisplayPort 1.4a
• Dimensions: 267 mm length, 120 mm height versus 190 mm length, 110 mm height, 40 mm width
• Production status: End-of-life versus Active
• Release date: 2021-08-02 versus 2023-12-07
• Predecessor: not specified versus Navi
• Successor: not specified versus Navi III

FAQ

Q: Which card is faster in Geekbench OpenCL?

A: The AMD Radeon Pro W6800X scores 124,498 versus 69,229 for the AMD Radeon RX 6600 LE, a 79.8% advantage.

Q: How do their memory capacities compare?

A: The Pro W6800X has 32 GB of GDDR6 on a 256-bit bus with 512.0 GB/s bandwidth. The RX 6600 LE has 8 GB of GDDR6 on a 128-bit bus with 224.0 GB/s bandwidth.

Q: What is the average benchmark score difference?

A: The Pro W6800X averages 160,671 across all recorded benchmarks, placing it in the 97th percentile. The RX 6600 LE averages 70,829, placing it in the 91st percentile.

Q: Are these cards on the same architecture?

A: Yes, both use RDNA 2.0 and are manufactured by TSMC on a 7 nm process. The Pro W6800X uses the Navi 21 chip and the RX 6600 LE uses the Navi 23 chip.

Q: What are the power requirements?

A: The Pro W6800X has a TDP of 200 W and a suggested PSU of 550 W. The RX 6600 LE has a TDP of 132 W and a suggested PSU of 300 W.

Q: Which card has a higher boost clock?

A: The RX 6600 LE boosts to 2495 MHz, while the Pro W6800X boosts to 2087 MHz. Despite the lower boost clock, the Pro W6800X delivers higher overall throughput due to more execution units.