AMD Instinct MI325X vs AMD Radeon RX 7900 GRE Comparison

AMD Instinct MI325X and AMD Radeon RX 7900 GRE are two very different products sharing the same AMD brand and 5 nm TSMC process. The MI325X is a data center accelerator built on CDNA 3.0 architecture, while the RX 7900 GRE is a consumer graphics card built on RDNA 3.0. The database shows no head-to-head benchmark entries for these two, as they target entirely different workloads. The Radeon RX 7900 GRE has an average benchmark score of 32,456 and sits at the 77th percentile of all GPUs, while the Instinct MI325X has no recorded benchmark scores and sits at the 50th percentile.

Head-to-Head Benchmarks

The recorded data includes no direct head-to-head benchmark comparisons between the AMD Instinct MI325X and the AMD Radeon RX 7900 GRE. This is expected given their disparate market positions. The MI325X is an OAM module with no display outputs, designed for server racks, whereas the RX 7900 GRE is a dual-slot consumer card with display outputs. Benchmark results for the RX 7900 GRE come from standard consumer testing suites like 3DMark Steel Nomad DX12, where it scores 4,814, Geekbench OpenCL at 175,758, and Geekbench Vulkan at 99,850. Passmark results show G3D at 27,089 and GPU Compute at 15,016. The MI325X has no equivalent entries in the database, meaning any direct numerical comparison would be speculative. What the data does show is that the RX 7900 GRE outperforms its nearest rivals: it is 0.2% ahead of the AMD FirePro S10000 and 0.9% ahead of the AMD Radeon Pro 570X, while trailing the AMD FirePro S9300 X2 by 0.3% and the AMD Radeon RX 590 GME by 0.4%. These deltas are small, placing the RX 7900 GRE in a tightly contested performance band. The MI325X, with no benchmark scores, cannot be positioned against any peers in the database, so its relative standing remains unmeasured.

Architecture Differences

The two cards diverge at the architectural level. The Instinct MI325X uses the Aqua Vanjaram chip with CDNA 3.0 architecture, while the RX 7900 GRE uses the Navi 31 chip with RDNA 3.0. Both are fabricated on a 5 nm process at TSMC, but the transistor counts are vastly different. The MI325X packs 153,000 million transistors on a 1,017 mm² die, yielding a transistor density of 150.4 million per mm². The RX 7900 GRE has 57,700 million transistors on a 529 mm² die, with a density of 109.1 million per mm². This means the MI325X has roughly 2.7 times the transistor count and nearly double the die area, reflecting its compute-focused design. The MI325X features 19,456 shading units, 1,216 texture mapping units, and zero ROPs, as it is not designed for rasterized graphics output. Its pixel rate is recorded as 0 MPixel/s, and its texture rate is 2,553.6 GTexel/s. The RX 7900 GRE has 5,120 shading units, 320 TMUs, 160 ROPs, and 80 ray tracing cores, with a pixel rate of 359.2 GPixel/s and a texture rate of 718.4 GTexel/s. The MI325X has no ray tracing cores listed, while the RX 7900 GRE supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI325X lists no API support for DirectX, OpenGL, or Vulkan, confirming its non-graphics role. Clock speeds also differ: the MI325X runs at a base of 1,000 MHz and boost of 2,100 MHz, while the RX 7900 GRE has a base of 1,287 MHz, a game clock of 1,880 MHz, and a boost of 2,245 MHz. The MI325X has no game clock listed, as it is not a gaming product.

Where Each One Wins

The data indicates a clear split by intended use case. The RX 7900 GRE wins in any scenario requiring graphics output, display connectivity, or standard consumer benchmarks. It has 1x HDMI 2.1a, 2x DisplayPort 2.1, and 1x USB Type-C outputs, plus a dual-slot form factor and a 276 mm length, making it installable in a standard PC case. Its 16 GB GDDR6 memory on a 256-bit bus delivers 576.0 GB/s bandwidth, which is substantial for gaming and workstation graphics tasks. The MI325X offers no display outputs and uses an OAM module form factor, meaning it cannot function as a standalone graphics card. Its advantage lies in raw compute and memory capacity. It has 256 GB of HBM3e memory on an 8,192-bit bus, delivering 6.14 TB/s of bandwidth, which is over ten times the bandwidth of the RX 7900 GRE. The MI325X also has a much higher FP32 throughput at 81.72 TFLOPS versus 45.98 TFLOPS for the RX 7900 GRE. In FP16, the MI325X matches its FP32 at 81.72 TFLOPS (1:1), while the RX 7900 GRE doubles its FP32 to 91.96 TFLOPS (2:1). The MI325X is designed for large-scale compute workloads like AI training and inference, where memory capacity and bandwidth are critical. The RX 7900 GRE, with its ray tracing cores and API support, is built for interactive graphics and consumer software ecosystems.

Specification Differences

The two cards differ across nearly every specification. The MI325X has 256 GB HBM3e memory versus 16 GB GDDR6 in the RX 7900 GRE. Bus width is 8,192 bits versus 256 bits. Bandwidth is 6.14 TB/s versus 576.0 GB/s. Transistor count is 153,000 million versus 57,700 million. Die size is 1,017 mm² versus 529 mm². Shading units are 19,456 versus 5,120. TMUs are 1,216 versus 320. ROPs are 0 versus 160. Ray tracing cores are absent versus 80. Pixel rate is 0 MPixel/s versus 359.2 GPixel/s. Texture rate is 2,553.6 GTexel/s versus 718.4 GTexel/s. FP32 is 81.72 TFLOPS versus 45.98 TFLOPS. FP16 is 81.72 TFLOPS (1:1) versus 91.96 TFLOPS (2:1). TDP is 1,000 W versus 260 W. Slot width is OAM module versus dual-slot. Power connectors are none versus 2x 8-pin. Suggested PSU is 1,400 W versus 600 W. Bus interface is PCIe 5.0 x16 versus PCIe 4.0 x16. The MI325X has no display outputs, while the RX 7900 GRE has three output types. The RX 7900 GRE has a length of 276 mm, height of 110 mm, and width of 51 mm, while the MI325X has no dimensions listed. Release dates also differ: the MI325X launched on 2024-10-09, while the RX 7900 GRE launched on 2023-07-26. The MI325X has no launch MSRP, while the RX 7900 GRE has a launch MSRP of 549 USD. The MI325X predecessor is Radeon Instinct, while the RX 7900 GRE predecessor is Navi II and successor is Navi IV.

FAQ

Q: Which card has more memory bandwidth?

A: The Instinct MI325X has 6.14 TB/s bandwidth from 256 GB HBM3e memory on an 8,192-bit bus, while the RX 7900 GRE has 576.0 GB/s from 16 GB GDDR6 on a 256-bit bus.

Q: Can the Instinct MI325X output video?

A: No, the MI325X has no display outputs, while the RX 7900 GRE has 1x HDMI 2.1a, 2x DisplayPort 2.1, and 1x USB Type-C.

Q: What is the FP32 performance difference?

A: The MI325X delivers 81.72 TFLOPS FP32, which is 77.8% higher than the RX 7900 GRE’s 45.98 TFLOPS.

Q: Does the RX 7900 GRE support ray tracing?

A: Yes, it has 80 ray tracing cores. The MI325X has no ray tracing cores listed.

Q: What are the power requirements?

A: The MI325X has a TDP of 1,000 W and requires a 1,400 W suggested PSU. The RX 7900 GRE has a TDP of 260 W and requires a 600 W suggested PSU.

Q: Which card is in the 77th percentile of all GPUs?

A: The RX 7900 GRE is in the 77th percentile with an average benchmark score of 32,456. The MI325X is in the 50th percentile with no benchmark scores.

The Verdict

The data makes the choice straightforward based on workload. The AMD Radeon RX 7900 GRE is the only option for any user needing a graphics card that connects to a display, runs standard benchmarks, or supports gaming APIs. Its benchmark scores, including 27,089 in Passmark G3D and 175,758 in Geekbench OpenCL, place it in the 77th percentile of all GPUs, and its nearest rivals are within 1% of its average score, showing tight competition in its segment. Its 16 GB memory and 576.0 GB/s bandwidth are adequate for consumer workloads, and its 260 W TDP and dual-slot design fit standard PC builds. The AMD Instinct MI325X is for a different audience entirely. With no display outputs, no API support, and a 1,000 W TDP, it is not a consumer product. Its strengths are in raw compute and memory capacity: 81.72 TFLOPS FP32, 256 GB HBM3e, and 6.14 TB/s bandwidth. The database records no benchmark scores for it, so its real-world performance cannot be quantified here, but its specifications indicate a purpose-built accelerator for memory-intensive compute tasks. The RX 7900 GRE wins every graphics-related metric, while the MI325X wins every memory and raw throughput metric. Users should select based on whether they need a graphics card or a compute accelerator. There is no overlap in their intended functions.