AMD Instinct MI300X vs AMD Radeon PRO W7900D Comparison

AMD’s two current accelerator families serve fundamentally different markets, and the recorded data in the database makes that split explicit. The Instinct MI300X is a data center compute module built for massive parallel workloads, while the Radeon PRO W7900D is a workstation graphics card with display outputs and a conventional PCIe form factor. Their benchmark profiles, architectural choices, and physical specifications place them at opposite ends of AMD’s professional lineup.

Head-to-Head Benchmarks

The database contains a single recorded benchmark for the AMD Instinct MI300X: a Geekbench OpenCL score of 317,994. That result places the MI300X at the 100th percentile among all GPUs in the database, meaning no other recorded graphics processor scores higher in this test. The Radeon PRO W7900D, by contrast, has no benchmark entries in the database, with an average benchmark score of zero and a 50th percentile ranking. Direct numerical comparison between the two cards is therefore impossible from recorded data alone.

The MI300X’s score can be contextualized against its nearest rivals. The NVIDIA B200 leads with an average score of 345,482, putting the MI300X 8% behind. The NVIDIA H200 NVL averages 334,891, a 5% advantage over the MI300X. In the opposite direction, the MI300X beats the NVIDIA L40S (295,763) by 7.5% and the NVIDIA RTX 6000 Ada Generation (287,237) by 10.7%. These deltas show that the MI300X sits in a competitive band near the top of the database, trading blows with NVIDIA’s most recent data center accelerators while clearly outpacing the previous generation of workstation-class cards.

Because the W7900D lacks any recorded benchmark scores, the head-to-head section of the database shows zero wins for either card. The practical interpretation is that the MI300X’s compute lead is substantial on paper, but the W7900D’s absence from the benchmark pool leaves its performance profile undefined in this dataset. The MI300X’s 81.72 TFLOPS FP32 throughput and 81.72 TFLOPS FP16 (1:1) rate dwarf the W7900D’s 52.99 TFLOPS in both precisions, but those specifications come from the hardware records, not from direct comparative testing.

FAQ

Q: Which card has a higher FP32 compute rating?

A: The AMD Instinct MI300X is rated at 81.72 TFLOPS FP32, while the AMD Radeon PRO W7900D is rated at 52.99 TFLOPS FP32. The MI300X therefore delivers about 54% more FP32 throughput based on the recorded specifications.

Q: What memory configurations do the two cards use?

A: The MI300X uses 192 GB of HBM3 memory on an 8192-bit bus, with 5.32 TB/s of bandwidth. The W7900D uses 48 GB of GDDR6 memory on a 384-bit bus, providing 864.0 GB/s of bandwidth.

Q: Do both cards support display outputs?

A: No. The MI300X has no display outputs and is designed as a compute module. The W7900D has 3x DisplayPort 2.1 and 1x mini-DisplayPort 2.1 outputs.

Q: What are the power requirements for each card?

A: The MI300X has a 750 W TDP and a suggested PSU rating of 1150 W. The W7900D has a 295 W TDP and a suggested PSU rating of 600 W.

Q: Which card has a higher memory clock?

A: The W7900D runs its memory at 2250 MHz (18 Gbps effective), while the MI300X runs at 1300 MHz (5.2 Gbps effective). The MI300X still achieves far higher total bandwidth due to its much wider memory bus.

Q: Are both cards built on the same manufacturing process?

A: Yes, both use a 5 nm process node at TSMC. However, the MI300X integrates 153,000 million transistors on a 1017 mm² die, while the W7900D integrates 57,700 million transistors on a 529 mm² die.

Architecture Differences

The MI300X is built on the CDNA 3.0 architecture with the Aqua Vanjaram chip, while the W7900D uses RDNA 3.0 with the Navi 31 chip, codenamed Plum Bonito. These are distinct architectures aimed at different workloads. CDNA 3.0 prioritizes compute throughput and memory bandwidth for AI and HPC tasks, which explains the MI300X’s 19456 shading units, 1216 texture mapping units, and zero ROPs. The absence of ROPs and display outputs confirms its role as a pure accelerator module.

The W7900D, using RDNA 3.0, includes 6144 shading units, 384 TMUs, 192 ROPs, and 96 ray tracing cores. It also supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI300X reports N/A for DirectX, OpenGL, and Vulkan, reinforcing that it is not intended for graphics rendering or API-based workloads.

The transistor counts differ dramatically: 153,000 million for the MI300X versus 57,700 million for the W7900D. The MI300X’s die size of 1017 mm² versus 529 mm² for the W7900D reflects the much larger memory and compute arrays on the Instinct card. Transistor density also differs, with the MI300X at 150.4 million transistors per mm² and the W7900D at 109.1 million per mm².

The memory subsystems are architecturally divergent as well. The MI300X uses HBM3 with an 8192-bit bus, which enables 5.32 TB/s of bandwidth. The W7900D uses GDDR6 with a 384-bit bus, yielding 864.0 GB/s. The MI300X’s memory clock is lower at 1300 MHz effective 5.2 Gbps, but the enormous bus width compensates. The W7900D runs memory at 2250 MHz effective 18 Gbps, but its narrower bus limits total throughput.

Clock speeds also differ. The MI300X has a base clock of 1000 MHz and a boost clock of 2100 MHz. The W7900D has a higher base clock of 1327 MHz and a boost clock of 2156 MHz. Despite the lower clocks, the MI300X achieves higher aggregate compute due to its far larger shader array.

The Verdict

The recorded data points to a clear separation of roles. The AMD Instinct MI300X is a high-bandwidth, high-throughput compute accelerator with no display outputs, no graphics API support, and a 750 W TDP. Its 192 GB of HBM3 memory and 5.32 TB/s bandwidth position it for large-model inference and memory-bound compute tasks. Its Geekbench OpenCL score of 317,994 places it at the top of the database’s GPU rankings, with only the NVIDIA B200 and H200 NVL scoring higher among its nearest rivals.

The AMD Radeon PRO W7900D is a workstation graphics card with 48 GB of GDDR6, 96 ray tracing cores, and full graphics API support including DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. It has three DisplayPort 2.1 outputs and one mini-DisplayPort 2.1 output, a triple-slot cooler, and a 295 W TDP. Its PCIe 4.0 x16 interface and 280 mm length make it a conventional add-in card, unlike the MI300X’s OAM module form factor with no power connectors and no display outputs.

The choice between them follows directly from workload requirements. For compute-only environments where memory bandwidth and raw FP32/FP16 throughput are the priority, the MI300X is the only option of the two. For graphics rendering, ray tracing, or any task requiring a display output, the W7900D is the functional choice. The benchmark data cannot rank them against each other because the W7900D has no recorded scores, but the hardware specifications alone indicate that the MI300X’s compute capacity is roughly 54% higher in FP32 and FP16, with over six times the memory bandwidth.

The W7900D’s higher boost clock (2156 MHz versus 2100 MHz) and higher base clock (1327 MHz versus 1000 MHz) do not offset the MI300X’s 19456 shading units versus 6144. The MI300X also has a transistor density advantage, 150.4 million per mm² versus 109.1 million, suggesting a more compact logic design despite the larger overall die. The W7900D’s 192 ROPs and 96 ray tracing cores give it graphics capabilities the MI300X entirely lacks, but those features are irrelevant in a server compute context.

Specification Differences

The two cards differ across nearly every recorded specification field. The MI300X uses the CDNA 3.0 architecture on the Aqua Vanjaram chip, while the W7900D uses RDNA 3.0 on the Navi 31 chip. The MI300X has no codename listed; the W7900D is codenamed Plum Bonito. The MI300X belongs to the Instinct (MIx) generation, while the W7900D belongs to the Radeon Pro Navi (Navi III Series) generation.

Process node and foundry are identical: 5 nm at TSMC. Transistors differ at 153,000 million versus 57,700 million, and die size differs at 1017 mm² versus 529 mm². Transistor density is 150.4 million per mm² for the MI300X and 109.1 million per mm² for the W7900D.

Base clocks are 1000 MHz for the MI300X and 1327 MHz for the W7900D. Boost clocks are 2100 MHz versus 2156 MHz. Memory clocks are 1300 MHz effective 5.2 Gbps versus 2250 MHz effective 18 Gbps.

Memory size is 192 GB HBM3 for the MI300X versus 48 GB GDDR6 for the W7900D. Bus width is 8192 bit versus 384 bit. Bandwidth is 5.32 TB/s versus 864.0 GB/s.

Shading units are 19456 versus 6144. TMUs are 1216 versus 384. ROPs are 0 versus 192. The MI300X has no ray tracing cores listed; the W7900D has 96. Pixel rate is 0 MPixel/s for the MI300X and 414.0 GPixel/s for the W7900D. Texture rate is 2,553.6 GTexel/s versus 827.9 GTexel/s.

FP32 is 81.72 TFLOPS for both cards in terms of ratio, but the raw values differ: 81.72 TFLOPS for the MI300X and 52.99 TFLOPS for the W7900D. FP16 follows the same pattern, 81.72 TFLOPS (1:1) versus 52.99 TFLOPS (1:1).

TDP is 750 W versus 295 W. The MI300X is an OAM Module with no power connectors; the W7900D is triple-slot with 2x 8-pin connectors. Suggested PSU is 1150 W versus 600 W. Bus interface is PCIe 5.0 x16 for the MI300X and PCIe 4.0 x16 for the W7900D.

Display outputs are none for the MI300X and 3x DisplayPort 2.1 plus 1x mini-DisplayPort 2.1 for the W7900D. The MI300X has N/A for DirectX, OpenGL, and Vulkan; the W7900D supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Dimensions favor the W7900D as a conventional card: 280 mm length, 110 mm height, 51 mm width. The MI300X has no dimensions recorded. Release dates are 2023-12-05 for the MI300X and 2025-09-24 for the W7900D. Predecessors are Radeon Instinct for the MI300X and Radeon Pro Vega for the W7900D. Neither card has a successor or launch MSRP recorded.