AMD Radeon Pro Vega 56 vs AMD Radeon RX 6600 LE Comparison

The AMD Radeon RX 6600 LE and the AMD Radeon Pro Vega 56 represent two distinct generations of AMD graphics technology, separated by six years of architectural evolution. The benchmark data reveals a clear overall winner, but the specific strengths of each card tell a more nuanced story. The RX 6600 LE secures victory in both shared benchmark tests, yet the Pro Vega 56 retains a significant edge in memory bandwidth and raw compute unit count that warrants closer examination.

Where Each One Wins

The data splits cleanly between compute workloads and memory-intensive tasks. In the Geekbench OpenCL test, the RX 6600 LE scores 69,229 against the Pro Vega 56's 61,930, a decisive 11.8% advantage. This suggests the newer RDNA 2.0 architecture handles general-purpose compute more efficiently per clock, despite the Pro Vega 56 having double the shading units (3,584 vs 1,792).

The Vulkan test reinforces this trend, with the RX 6600 LE posting 72,428 versus 66,004 for the Pro Vega 56, a 9.7% margin. The RX 6600 LE wins both head-to-head benchmarks, giving it a 2-0 record in this comparison. Its 91st percentile ranking among all GPUs versus the Pro Vega 56's 89th percentile further confirms its overall superiority in these synthetic workloads.

However, the Pro Vega 56 claims victory in memory architecture. Its HBM2 memory runs on a 2048-bit bus, delivering 402.4 GB/s of bandwidth — a substantial 80% increase over the RX 6600 LE's 224.0 GB/s from its 128-bit GDDR6 interface. For workloads that are bandwidth-bound rather than compute-bound, the Pro Vega 56's memory subsystem could theoretically flip the script, even though the benchmark data doesn't capture such scenarios.

Architecture Differences

The fundamental divide lies in process technology and design philosophy. The RX 6600 LE uses TSMC's 7 nm process with the Navi 23 chip, packing 11,060 million transistors into a 237 mm² die. The Pro Vega 56 relies on GlobalFoundries' 14 nm process with the Vega 10 chip, containing 12,500 million transistors across a massive 495 mm² die. This transistor density difference — 46.7M per mm² for the RX 6600 LE versus 25.3M for the Pro Vega 56 — explains much of the performance gap.

Architecturally, the RX 6600 LE builds on RDNA 2.0, which introduces dedicated ray tracing cores (28 of them) and support for DirectX 12 Ultimate (12_2). The Pro Vega 56 uses older GCN 5.0 with no ray tracing hardware and only DirectX 12 (12_1) support. The RX 6600 LE also supports Vulkan 1.4 versus Vulkan 1.3 on the Pro Vega 56.

Clock speeds tell a dramatic story: the RX 6600 LE boosts to 2,495 MHz compared to the Pro Vega 56's 1,250 MHz. This 2x clock advantage more than compensates for the Pro Vega 56's higher shading unit count in most scenarios. The RX 6600 LE's pixel rate of 159.7 GPixel/s nearly doubles the Pro Vega 56's 80.00 GPixel/s, while texture rates are nearly identical (279.4 vs 280.0 GTexel/s).

Head-to-Head Benchmarks

The Geekbench OpenCL result stands as the largest single victory for the RX 6600 LE. Its 69,229 score versus 61,930 represents an 11.8% delta. This margin is particularly telling because OpenCL often favors architectures with more compute units; the fact that the RDNA 2.0 card wins despite half the shading units indicates the efficiency gain from the 7 nm node and newer instruction set.

In Geekbench Vulkan, the RX 6600 LE extends its lead with 72,428 versus 66,004, a 9.7% improvement. The Vulkan API's low-overhead design appears to benefit the newer architecture more substantially. Notably, the RX 6600 LE's Vulkan score surpasses its OpenCL score by 4.6%, while the Pro Vega 56 improves only 6.6% moving from OpenCL to Vulkan — a smaller relative gain that suggests the older GCN architecture doesn't scale as well with modern APIs.

The Pro Vega 56's best result comes from Geekbench Metal, where it scores 63,145 — its highest of three benchmarks. This hints that Apple's Metal API may extract more performance from the GCN architecture, though the RX 6600 LE has no Metal benchmark data for direct comparison. The Pro Vega 56's average benchmark score of 63,693 places it within 0.1% of the AMD Radeon RX 7600M, showing it remains competitive with much newer hardware in certain contexts.

FAQ

Q: Which card has higher raw compute throughput?

A: The two cards are virtually tied in FP32 performance, with the RX 6600 LE at 8.942 TFLOPS and the Pro Vega 56 at 8.960 TFLOPS. The Pro Vega 56 holds a razor-thin 0.2% advantage in this metric.

Q: How does memory bandwidth compare between the two?

A: The Pro Vega 56's HBM2 memory provides 402.4 GB/s bandwidth over a 2048-bit bus, while the RX 6600 LE's GDDR6 offers 224.0 GB/s over a 128-bit bus. The Pro Vega 56 delivers 79.6% more bandwidth.

Q: What is the power consumption difference?

A: The RX 6600 LE has a 132 W TDP, while the Pro Vega 56 consumes 210 W. The RX 6600 LE requires a 300 W suggested PSU with a single 8-pin connector, whereas the Pro Vega 56 is an integrated graphics processor with no power connectors.

Q: Which card supports ray tracing?

A: Only the RX 6600 LE includes dedicated ray tracing cores (28 of them). The Pro Vega 56 has no ray tracing hardware whatsoever.

Q: How do their production statuses differ?

A: The RX 6600 LE is listed as Active production, released on December 7, 2023. The Pro Vega 56 is End-of-life, having launched on August 13, 2017.

Q: Which card has better driver/API support?

A: The RX 6600 LE supports DirectX 12 Ultimate (12_2), Vulkan 1.4, and OpenGL 4.6. The Pro Vega 56 supports DirectX 12 (12_1), Vulkan 1.3, and OpenGL 4.6. The RX 6600 LE also adds HDMI 2.1 output versus HDMI 2.0b on the older card.

The Verdict

The benchmark data unreservedly favors the AMD Radeon RX 6600 LE. It wins both shared tests with double-digit margins, ranks higher in the overall GPU percentile (91st vs 89th), and does so while consuming 37% less power (132 W vs 210 W). Its modern architecture brings ray tracing, newer API support, and a 7 nm process that delivers nearly double the performance per transistor.

The AMD Radeon Pro Vega 56 retains relevance only in bandwidth-sensitive scenarios. Its 402.4 GB/s memory bandwidth and 2048-bit bus remain unmatched by the RX 6600 LE's 224.0 GB/s. For compute tasks that saturate memory bandwidth — such as certain scientific simulations or large data processing — the Pro Vega 56's memory subsystem could provide an advantage that synthetic benchmarks don't fully capture.

However, the Pro Vega 56's end-of-life status, lack of ray tracing, older API support, and significantly higher power draw make it difficult to recommend for any modern workload. The RX 6600 LE's active production status and architectural advantages suggest it will continue receiving driver optimizations, widening the gap further over time.

Specification Differences

| Specification | AMD Radeon RX 6600 LE | AMD Radeon Pro Vega 56 |

|---|---|---|

| Architecture | RDNA 2.0 | GCN 5.0 |

| Process Node | 7 nm (TSMC) | 14 nm (GlobalFoundries) |

| Transistors | 11,060 million | 12,500 million |

| Die Size | 237 mm² | 495 mm² |

| Transistor Density | 46.7M / mm² | 25.3M / mm² |

| Base Clock | 1626 MHz | 1138 MHz |

| Boost Clock | 2495 MHz | 1250 MHz |

| Memory Type | GDDR6 | HBM2 |

| Memory Bus Width | 128 bit | 2048 bit |

| Memory Bandwidth | 224.0 GB/s | 402.4 GB/s |

| Shading Units | 1792 | 3584 |

| TMUs | 112 | 224 |

| Ray Tracing Cores | 28 | None |

| Pixel Rate | 159.7 GPixel/s | 80.00 GPixel/s |

| Texture Rate | 279.4 GTexel/s | 280.0 GTexel/s |

| TDP | 132 W | 210 W |

| Bus Interface | PCIe 4.0 x8 | PCIe 3.0 x16 |

| Display Outputs | 1x HDMI 2.1, 3x DisplayPort 1.4a | 1x HDMI 2.0b, 3x DisplayPort 1.4a |

| DirectX Support | 12 Ultimate (12_2) | 12 (12_1) |

| Vulkan Support | 1.4 | 1.3 |

| Slot Width | Dual-slot | IGP |

| Power Connectors | 1x 8-pin | None |

| Suggested PSU | 300 W | Not specified |

| Production Status | Active | End-of-life |

| Release Date | 2023-12-07 | 2017-08-13 |