AMD Instinct MI325X vs AMD Radeon RX 6600 LE Comparison

Where Each One Wins

The data divides these two accelerators along stark functional lines. The AMD Instinct MI325X is a compute-oriented accelerator with no display outputs, no graphics API support, and no recorded benchmark scores in the database. Its entire design targets memory-bandwidth-heavy and parallel compute workloads. The AMD Radeon RX 6600 LE, by contrast, is a conventional graphics card with a full API stack, display outputs, and two recorded benchmark scores that place it in the 91st percentile of all GPUs.

In terms of raw compute throughput, the MI325X holds an overwhelming advantage. The FP32 figure of 81.72 TFLOPS is roughly 9.1 times the RX 6600 LE's 8.942 TFLOPS. Texture rate follows the same pattern: the MI325X delivers 2,553.6 GTexel/s versus 279.4 GTexel/s for the RX 6600 LE, a gap of roughly 9.1 times. The MI325X also reaches 81.72 TFLOPS in FP16 with a 1:1 ratio, while the RX 6600 LE reaches 17.88 TFLOPS FP16 via a 2:1 ratio. The MI325X doubles its FP32 throughput in FP16, while the RX 6600 LE only doubles its FP32 figure, so the absolute FP16 gap is 4.6 times.

The RX 6600 LE wins in areas tied to graphics output. It has a pixel rate of 159.7 GPixel/s, while the MI325X records 0 MPixel/s. The RX 6600 LE has 64 ROPs; the MI325X has 0. The RX 6600 LE also supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the MI325X lists no graphics API support at all. Any workload that requires rasterization, pixel shading, or display output only exists on the RX 6600 LE side of this comparison.

Architecture Differences

Both chips come from AMD and both are built by TSMC, but the similarities end there. The MI325X uses the Aqua Vanjaram chip on the CDNA 3.0 architecture, built on a 5 nm process. The RX 6600 LE uses the Navi 23 chip on the RDNA 2.0 architecture, built on a 7 nm process. The process node difference is significant: 5 nm versus 7 nm, which partially explains how the MI325X packs far more transistors into a much larger die.

The transistor counts differ by an order of magnitude. The MI325X integrates 153,000 million transistors on a 1017 mm² die, giving a transistor density of 150.4 million per mm². The RX 6600 LE integrates 11,060 million transistors on a 237 mm² die, for a density of 46.7 million per mm². The MI325X therefore has roughly 13.8 times the transistor count and a die area about 4.3 times larger.

Shader and texture resources follow the same pattern. The MI325X has 19,456 shading units and 1,216 TMUs. The RX 6600 LE has 1,792 shading units and 112 TMUs. The MI325X carries no ROPs and no ray tracing cores, while the RX 6600 LE has 64 ROPs and 28 ray tracing cores. Neither part lists tensor cores. Memory architecture differs completely: the MI325X uses 256 GB of HBM3e on an 8192-bit bus, while the RX 6600 LE uses 8 GB of GDDR6 on a 128-bit bus. Memory bandwidth is 6.14 TB/s for the MI325X versus 224.0 GB/s for the RX 6600 LE, a factor of roughly 27.4.

The MI325X is an OAM module with no power connectors, no display outputs, and a 1000 W TDP. It requires a 1400 W suggested PSU and uses PCIe 5.0 x16. The RX 6600 LE is a dual-slot card with one 8-pin power connector, a 132 W TDP, a 300 W suggested PSU, PCIe 4.0 x8, and three display outputs. The MI325X releases on 2024-10-09, while the RX 6600 LE releases on 2023-12-07. The RX 6600 LE has a production status of Active; the MI325X has no listed production status.

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark results between these two parts. The MI325X has no recorded benchmark scores and an average benchmark score of zero, placing it in the 50th percentile of all GPUs. The RX 6600 LE has two recorded scores: 69,229 in Geekbench OpenCL and 72,428 in Geekbench Vulkan, with an average of 70,829. That average places it in the 91st percentile of all GPUs.

The RX 6600 LE's nearest rivals in the database provide context for its measured performance. NVIDIA's RTX A3000 Mobile scores 70,140, which is 1% lower than the RX 6600 LE. The NVIDIA Quadro P6000 scores 69,986, also 1.2% lower. The AMD Radeon Pro WX 8200 scores 69,870, 1.4% lower. The only rival that beats it is the AMD Radeon RX 6650M at 71,768, which is 1.3% higher. These are narrow margins, indicating the RX 6600 LE sits in a tightly packed performance cluster among mobile and workstation parts.

The MI325X has no nearest rivals listed and no benchmark data, so its compute advantage can only be assessed through its specification-level figures. The FP32 throughput of 81.72 TFLOPS, memory bandwidth of 6.14 TB/s, and memory capacity of 256 GB are the measured design parameters. The RX 6600 LE's FP32 throughput is 8.942 TFLOPS, and its memory bandwidth is 224.0 GB/s. The MI325X's FP32 figure is approximately 9.1 times higher, and its bandwidth is approximately 27.4 times higher. The RX 6600 LE's pixel rate of 159.7 GPixel/s and its ray tracing cores give it capabilities the MI325X does not list at all.

Clock behavior differs in an interesting way. The MI325X has a base clock of 1000 MHz and a boost clock of 2100 MHz. The RX 6600 LE has a base clock of 1626 MHz, a game clock of 2045 MHz, and a boost clock of 2495 MHz. Despite lower clock speeds, the MI325X achieves far higher throughput because of its massive shader count and memory subsystem. The MI325X memory clock is listed at 1500 MHz with 6 Gbps effective, while the RX 6600 LE memory clock is 1750 MHz with 14 Gbps effective, yet the MI325X's 8192-bit bus delivers 6.14 TB/s against the RX 6600 LE's 224.0 GB/s.

The Verdict

The recorded data supports a clear split. The AMD Instinct MI325X exists for compute workloads that demand extreme FP32 and FP16 throughput, enormous memory capacity, and very high memory bandwidth. Its 81.72 TFLOPS FP32, 256 GB of HBM3e, 6.14 TB/s bandwidth, and 1000 W TDP classify it as a data-center scale accelerator. It has no display outputs, no graphics APIs, and no ROPs, so it cannot function as a graphics card.

The AMD Radeon RX 6600 LE exists for graphics and general-purpose compute on a conventional desktop platform. Its 8.942 TFLOPS FP32, 8 GB of GDDR6, 224.0 GB/s bandwidth, and 132 W TDP place it in a completely different performance and power class. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, has 28 ray tracing cores, and outputs to displays through HDMI 2.1 and DisplayPort 1.4a. Its benchmark scores place it in the 91st percentile, narrowly ahead of or behind a small cluster of mobile and workstation rivals.

Users who need a graphics card with rasterization, ray tracing, or display output have only one option in this comparison: the RX 6600 LE. Users who need a compute accelerator with no graphics path have only one option: the MI325X. The MI325X's compute specifications dwarf the RX 6600 LE's in every measured compute metric, but the RX 6600 LE is the only one of the two with any recorded benchmark scores. The MI325X's 50th percentile ranking reflects the absence of recorded performance data, not a measured performance level.

FAQ

Q: Which card has higher FP32 compute performance?

A: The AMD Instinct MI325X has 81.72 TFLOPS FP32, while the AMD Radeon RX 6600 LE has 8.942 TFLOPS FP32. The MI325X is approximately 9.1 times higher.

Q: Does the AMD Instinct MI325X support display output?

A: No. The MI325X lists no display outputs. The RX 6600 LE has 1x HDMI 2.1 and 3x DisplayPort 1.4a.

Q: Which part has more memory bandwidth?

A: The MI325X has 6.14 TB/s from 256 GB of HBM3e on an 8192-bit bus. The RX 6600 LE has 224.0 GB/s from 8 GB of GDDR6 on a 128-bit bus.

Q: What are the recorded benchmark scores for the RX 6600 LE?

A: The RX 6600 LE scores 69,229 in Geekbench OpenCL and 72,428 in Geekbench Vulkan, with an average of 70,829. The MI325X has no recorded benchmark scores.

Q: How does the RX 6600 LE compare to its nearest rivals?

A: It is 1% higher than the NVIDIA RTX A3000 Mobile, 1.2% higher than the NVIDIA Quadro P6000, 1.4% higher than the AMD Radeon Pro WX 8200, and 1.3% lower than the AMD Radeon RX 6650M.

Q: Which part has ray tracing cores?

A: The RX 6600 LE has 28 ray tracing cores. The MI325X lists no ray tracing cores.

Q: What are the power requirements for each?

A: The MI325X has a 1000 W TDP and a 1400 W suggested PSU. The RX 6600 LE has a 132 W TDP and a 300 W suggested PSU.

Specification Differences

| Specification | AMD Instinct MI325X | AMD Radeon RX 6600 LE |

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

| Chip | Aqua Vanjaram | Navi 23 |

| Architecture | CDNA 3.0 | RDNA 2.0 |

| Generation | Instinct (MIx) | Navi II (RX 6000) |

| Process Node | 5 nm | 7 nm |

| Transistors | 153,000 million | 11,060 million |

| Die Size | 1017 mm² | 237 mm² |

| Transistor Density | 150.4M / mm² | 46.7M / mm² |

| Base Clock | 1000 MHz | 1626 MHz |

| Boost Clock | 2100 MHz | 2495 MHz |

| Game Clock | None | 2045 MHz |

| Memory Size | 256 GB | 8 GB |

| Memory Type | HBM3e | GDDR6 |

| Memory Bus Width | 8192 bit | 128 bit |

| Memory Bandwidth | 6.14 TB/s | 224.0 GB/s |

| Shading Units | 19456 | 1792 |

| TMUs | 1216 | 112 |

| ROPs | 0 | 64 |

| Ray Tracing Cores | None | 28 |

| Pixel Rate | 0 MPixel/s | 159.7 GPixel/s |

| Texture Rate | 2,553.6 GTexel/s | 279.4 GTexel/s |

| FP32 | 81.72 TFLOPS | 8.942 TFLOPS |

| FP16 | 81.72 TFLOPS (1:1) | 17.88 TFLOPS (2:1) |

| TDP | 1000 W | 132 W |

| Slot Width | OAM Module | Dual-slot |

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

| Suggested PSU | 1400 W | 300 W |

| Bus Interface | PCIe 5.0 x16 | PCIe 4.0 x8 |

| Display Outputs | No outputs | 1x HDMI 2.1, 3x DisplayPort 1.4a |

| DirectX | N/A | 12 Ultimate (12_2) |

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.4 |

| Release Date | 2024-10-09 | 2023-12-07 |

| Production Status | None listed | Active |

| Predecessor | Radeon Instinct | Navi |

| Successor | None | Navi III |