AMD Instinct MI325X vs AMD Radeon RX 7900M Comparison

Head-to-Head Benchmarks

The recorded data does not contain any direct head-to-head benchmark results between the AMD Instinct MI325X and the AMD Radeon RX 7900M. The database shows no shared test entries for these two accelerators. This absence of overlapping benchmarks is itself informative: the two products occupy different measurement domains. The Instinct MI325X has no benchmark scores recorded at all, placing it at the 50th percentile among all GPUs with an average benchmark score of zero. The Radeon RX 7900M, by contrast, has three recorded benchmark results and sits at the 94th percentile among all GPUs.

For the Radeon RX 7900M, the available data shows a 3DMark Steel Nomad DX12 score of 4201, a Geekbench OpenCL score of 129499, and a Geekbench Vulkan score of 158760. Its average benchmark score is 97487. Against its nearest rivals, the RX 7900M leads the AMD Radeon Instinct MI60 by 5.4% and the NVIDIA RTX A4500 by 6.3%. It trails the NVIDIA Quadro RTX 6000 by 4.3% and sits nearly even with the AMD Radeon Pro VII, ahead by just 0.4%.

The Instinct MI325X cannot be compared on any numeric benchmark basis within this dataset. Its only recorded percentile position is the median 50th percentile, which reflects the absence of measured results rather than a performance verdict. The RX 7900M, with its 94th percentile placement, is clearly the better-documented part in this comparison.

FAQ

Q: Which GPU has more shading units?

A: The AMD Instinct MI325X has 19456 shading units, while the AMD Radeon RX 7900M has 4608 shading units. The Instinct MI325X carries more than four times the shading unit count.

Q: How much memory does each accelerator have?

A: The Instinct MI325X has 256 GB of HBM3e memory on an 8192-bit bus, with 6.14 TB/s of bandwidth. The Radeon RX 7900M has 16 GB of GDDR6 memory on a 256-bit bus, with 576.0 GB/s of bandwidth. The Instinct MI325X provides 16 times the memory capacity.

Q: What is the power draw difference?

A: The Instinct MI325X has a TDP of 1000 W and requires a suggested PSU of 1400 W. The Radeon RX 7900M has a TDP of 180 W and has no suggested PSU listed. The Instinct MI325X draws more than five times the power.

Q: Which GPU supports DirectX?

A: The Radeon RX 7900M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The Instinct MI325X lists N/A for DirectX, OpenGL, and Vulkan, and has no display outputs. The RX 7900M is the only one of the two with graphics API support.

Q: What is the memory clock difference?

A: The Instinct MI325X runs its memory at 1500 MHz with 6 Gbps effective transfer. The Radeon RX 7900M runs its memory at 2250 MHz with 18 Gbps effective transfer. The RX 7900M has a higher memory clock, but the Instinct MI325X achieves far greater total bandwidth due to its much wider bus.

Q: What are the process nodes of these chips?

A: Both are fabricated by TSMC on a 5 nm process. The Instinct MI325X uses the Aqua Vanjaram chip with 153,000 million transistors on a 1017 mm² die. The Radeon RX 7900M uses the Navi 31 chip with 57,700 million transistors on a 529 mm² die.

The Verdict

The data supports a clear split. The AMD Instinct MI325X is a compute accelerator with enormous memory capacity, 256 GB of HBM3e, and a peak FP32 throughput of 81.72 TFLOPS. It has no display outputs, no graphics API support, and a 1000 W TDP. This part is built for server-scale workloads where raw memory bandwidth and FP32 compute matter. Its 6.14 TB/s of memory bandwidth and 8192-bit bus are unmatched in this comparison.

The AMD Radeon RX 7900M is a mobile graphics processor. It has 16 GB of GDDR6 memory, 576.0 GB/s of bandwidth, 72 ray tracing cores, and support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. It draws 180 W and is classified as an IGP with portable-device-dependent display outputs. Its benchmark results confirm real-world performance: the 94th percentile placement among all GPUs and an average score of 97487 place it above the Radeon Instinct MI60 and RTX A4500 in the recorded data.

For a builder assembling a workstation or server node focused on memory-bound compute, the Instinct MI325X is the only one of the two that fits. For a laptop or portable system needing graphics API support and display output, the RX 7900M is the only viable choice. The two are not substitutes.

Specification Differences

The Instinct MI325X and Radeon RX 7900M differ across nearly every measured specification. The Instinct MI325X uses the Aqua Vanjaram chip with CDNA 3.0 architecture, while the RX 7900M uses the Navi 31 chip with RDNA 3.0 architecture. Transistor counts are 153,000 million versus 57,700 million. Die sizes are 1017 mm² versus 529 mm². Transistor density is 150.4M per mm² versus 109.1M per mm².

Base clocks differ substantially: 1000 MHz for the Instinct MI325X versus 1825 MHz for the RX 7900M. Boost clocks are closer, at 2100 MHz versus 2090 MHz. Memory configurations are entirely different: 256 GB HBM3e on an 8192-bit bus versus 16 GB GDDR6 on a 256-bit bus. Memory bandwidth is 6.14 TB/s versus 576.0 GB/s. The memory clock reads 1500 MHz with 6 Gbps effective for the Instinct MI325X, and 2250 MHz with 18 Gbps effective for the RX 7900M.

Shading units number 19456 versus 4608. Texture mapping units are 1216 versus 288. Raster operation units are 0 versus 192. The RX 7900M has 72 ray tracing cores; the Instinct MI325X lists none. Pixel rates are 0 MPixel/s versus 401.3 GPixel/s. Texture rates are 2,553.6 GTexel/s versus 601.9 GTexel/s. FP32 throughput is 81.72 TFLOPS versus 38.52 TFLOPS. FP16 throughput is 81.72 TFLOPS at a 1:1 ratio for the Instinct MI325X, versus 77.05 TFLOPS at a 2:1 ratio for the RX 7900M.

Power and form factor separate them further. The Instinct MI325X has a 1000 W TDP, an OAM module slot width, and a suggested PSU of 1400 W. The RX 7900M has a 180 W TDP and an IGP slot width with no suggested PSU listed. The bus interface is PCIe 5.0 x16 for the Instinct MI325X and PCIe 4.0 x16 for the RX 7900M. The Instinct MI325X has no display outputs; the RX 7900M has portable-device-dependent outputs. The Instinct MI325X lists N/A for DirectX, OpenGL, and Vulkan; the RX 7900M supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The RX 7900M is marked as Active in production status, while the Instinct MI325X has no production status recorded. Release dates differ: the Instinct MI325X was released on 2024-10-09, and the RX 7900M on 2023-10-18.

Architecture Differences

The two chips come from different architectural families within AMD. The Instinct MI325X uses CDNA 3.0, AMD's compute-focused architecture, implemented in the Aqua Vanjaram chip. The Radeon RX 7900M uses RDNA 3.0, the graphics-focused architecture, implemented in the Navi 31 chip. Both are built by TSMC on a 5 nm process, but the design goals diverge sharply.

CDNA 3.0 in the Instinct MI325X prioritizes FP32 compute and memory bandwidth. Its FP32 and FP16 throughput are identical at 81.72 TFLOPS, with a 1:1 ratio. That indicates a design that does not rely on packed math to boost FP16 rates. The chip carries 19456 shading units and 1216 texture mapping units, but zero raster operation units and no ray tracing cores. This is consistent with an accelerator that does not rasterize or ray trace. The 256 GB HBM3e stack on an 8192-bit bus delivers 6.14 TB/s, a figure that dwarfs the mobile part. The absence of display outputs and graphics API support reinforces the compute-only orientation.

RDNA 3.0 in the Radeon RX 7900M targets graphics rendering. It has 4608 shading units, 288 texture mapping units, 192 raster operation units, and 72 ray tracing cores. Its FP16 throughput of 77.05 TFLOPS exceeds its FP32 throughput of 38.52 TFLOPS because RDNA 3.0 uses a 2:1 packed math ratio. Pixel rate is 401.3 GPixel/s, a figure the Instinct MI325X cannot match because it has no raster pipeline. The RX 7900M supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, making it a full-featured graphics processor for portable systems.

The transistor density figures reflect the different design philosophies. The Instinct MI325X packs 150.4M transistors per mm² across 1017 mm², for a total of 153,000 million transistors. The RX 7900M packs 109.1M transistors per mm² across 529 mm², for a total of 57,700 million transistors. The larger, denser compute die is built to feed HBM3e and sustain 1000 W. The smaller mobile die is built to fit within 180 W and drive displays.

Where Each One Wins

The Instinct MI325X wins in raw compute and memory metrics. FP32 throughput of 81.72 TFLOPS is more than double the RX 7900M's 38.52 TFLOPS. FP16 throughput is also higher, 81.72 TFLOPS versus 77.05 TFLOPS, though the margin is smaller. Memory bandwidth of 6.14 TB/s is more than ten times the RX 7900M's 576.0 GB/s. Memory capacity of 256 GB is 16 times larger. Texture rate of 2,553.6 GTexel/s is more than four times the RX 7900M's 601.9 GTexel/s. The PCIe 5.0 x16 interface is a generation ahead of the RX 7900M's PCIe 4.0 x16.

The Radeon RX 7900M wins in every graphics-oriented category. It has 192 raster operation units and a pixel rate of 401.3 GPixel/s, while the Instinct MI325X has none. It has 72 ray tracing cores; the Instinct MI325X has none. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4; the Instinct MI325X supports none. It has display outputs, while the Instinct MI325X has none. Its base clock of 1825 MHz is much higher than the Instinct MI325X's 1000 MHz, and its memory clock of 2250 MHz with 18 Gbps effective exceeds the Instinct MI325X's 1500 MHz with 6 Gbps effective.

The power envelope also favors the RX 7900M. At 180 W, it can operate in a mobile system with no suggested PSU requirement. The Instinct MI325X at 1000 W requires a 1400 W PSU and an OAM module slot. The RX 7900M is the only one of the two with recorded benchmark scores, and those scores place it at the 94th percentile among all GPUs, with an average score of 97487. The Instinct MI325X has no recorded benchmarks and sits at the 50th percentile.

The use-case split is unambiguous. For memory-bound compute, large model inference, or any workload that needs hundreds of gigabytes of on-package memory, the Instinct MI325X is the only contender. For graphics rendering, ray tracing, or any workload that needs a display output and graphics API support, the Radeon RX 7900M is the only contender. Neither chip can perform the other's primary function.