AMD Instinct MI300 vs AMD Radeon RX 7900 GRE Comparison

Head-to-Head Benchmarks

The benchmark comparison between the AMD Instinct MI300 and the AMD Radeon RX 7900 GRE is complicated by the fact that the two cards serve entirely different purposes. The Instinct MI300 is a compute-oriented accelerator designed for data center workloads, while the RX 7900 GRE is a consumer graphics card built around gaming and general-purpose rendering. The database contains a full benchmark suite for the RX 7900 GRE, but the MI300 has no recorded benchmark scores, and no head-to-head test results exist between the two. This means the comparison must rely on architectural specifications, memory characteristics, and the RX 7900 GRE's positioning within the broader GPU landscape.

The RX 7900 GRE posts an average benchmark score of 32,456 across the recorded tests. Its percentile ranking versus all GPUs sits at 77, meaning it outperforms a substantial majority of graphics cards in the database. The closest rival in its benchmark neighborhood is the AMD FirePro S10000, which scores 32,388, a delta of 0.2 percent. The AMD FirePro S9300 X2 scores 32,540, placing it 0.3 percent ahead of the RX 7900 GRE. The AMD Radeon RX 590 GME scores 32,601, 0.4 percent ahead, while the AMD Radeon Pro 570X trails at 32,176, a 0.9 percent gap. These deltas are remarkably tight, indicating that the RX 7900 GRE sits in a crowded performance band where minor architectural differences separate the cards.

Looking at individual benchmarks for the RX 7900 GRE, the compute-oriented tests show strong results. The Geekbench OpenCL score reaches 175,758, which is far higher than the Vulkan score of 99,850. This gap suggests the card handles compute workloads more efficiently than graphics API workloads in synthetic testing. The Passmark G3D score of 27,089 represents the overall 3D graphics performance, while the Passmark GPU Compute score of 15,016 shows a separate compute-focused measurement. DirectX tests reveal a mixed picture: DirectX 9 scores 310, DirectX 11 scores 300, DirectX 10 scores 139, and DirectX 12 scores 107. The G2D score of 1,180 indicates 2D graphics throughput.

The MI300, by contrast, has zero recorded benchmarks and an average score of zero. Its percentile ranking of 50 places it at the median of all GPUs in the database, but this figure likely reflects the absence of test data rather than actual performance. The card's specifications tell a different story from its benchmark profile. The FP32 throughput of 47.87 TFLOPS edges out the RX 7900 GRE's 45.98 TFLOPS by roughly 4 percent. In FP16, the MI300 also delivers 47.87 TFLOPS with a 1:1 ratio, whereas the RX 7900 GRE achieves 91.96 TFLOPS with a 2:1 ratio, effectively doubling its FP16 output relative to FP32.

Texture rate heavily favors the MI300 at 1,496.0 GTexel/s compared to the RX 7900 GRE's 718.4 GTexel/s, a difference of roughly 108 percent. Pixel rate, however, is reversed: the RX 7900 GRE achieves 359.2 GPixel/s while the MI300 is recorded at 0 MPixel/s, reflecting the absence of ROPs on the compute card. The MI300 has zero ROPs, while the RX 7900 GRE has 160. This fundamental difference underscores their divergent design goals.

FAQ

Q: Which card has more memory bandwidth?

A: The AMD Instinct MI300 offers 5.32 TB/s of bandwidth from its 128 GB HBM3 memory across an 8192-bit bus. The Radeon RX 7900 GRE provides 576.0 GB/s from 16 GB of GDDR6 memory on a 256-bit bus. The MI300 delivers roughly 9.2 times the bandwidth of the RX 7900 GRE.

Q: What is the average benchmark score difference between the two cards?

A: The RX 7900 GRE has an average benchmark score of 32,456 across ten recorded tests. The MI300 has no recorded benchmark scores, resulting in an average score of zero. Direct comparison of measured performance is therefore not possible from the database.

Q: How does the RX 7900 GRE compare to its nearest rivals?

A: The RX 7900 GRE sits within a tight performance cluster. The AMD FirePro S10000 is 0.2 percent behind, the AMD FirePro S9300 X2 is 0.3 percent ahead, the AMD Radeon RX 590 GME is 0.4 percent ahead, and the AMD Radeon Pro 570X is 0.9 percent behind. All four rivals fall within a 1.3 percentage point spread.

Q: What power supply is suggested for each card?

A: The MI300 has a suggested PSU of 1000 W with a TDP of 600 W. The RX 7900 GRE has a suggested PSU of 600 W with a TDP of 260 W. Both cards use two 8-pin power connectors.

Q: What is the transistor density of each chip?

A: The MI300's Aqua Vanjaram chip contains 153,000 million transistors on a 1017 mm² die, yielding a density of 150.4 million transistors per square millimeter. The RX 7900 GRE's Navi 31 chip has 57,700 million transistors on a 529 mm² die, giving 109.1 million per square millimeter.

Q: Which card supports ray tracing?

A: Only the RX 7900 GRE has ray tracing support, with 80 ray tracing cores. The MI300 has no recorded ray tracing cores, consistent with its compute-focused design.

The Verdict

The data indicates that the AMD Instinct MI300 and AMD Radeon RX 7900 GRE are not direct competitors. The MI300 is an accelerator with 128 GB of HBM3 memory, 8192-bit bus width, and 5.32 TB/s bandwidth, designed for memory-intensive compute tasks. The RX 7900 GRE is a consumer graphics card with 16 GB of GDDR6 memory, 256-bit bus width, and 576.0 GB/s bandwidth, built for rendering and gaming workloads.

The MI300's FP32 throughput of 47.87 TFLOPS is 4 percent higher than the RX 7900 GRE's 45.98 TFLOPS, and its texture rate of 1,496.0 GTexel/s is more than double. However, the RX 7900 GRE achieves a much higher FP16 rate of 91.96 TFLOPS due to its 2:1 ratio, and it has 160 ROPs enabling pixel output at 359.2 GPixel/s, while the MI300 has no ROPs and no pixel output capability.

The RX 7900 GRE has a percentile ranking of 77 and an average benchmark score of 32,456, indicating it performs well within the consumer GPU landscape. The MI300's percentile of 50 reflects the absence of recorded benchmarks, not necessarily its real-world standing. Users requiring a display output will find the RX 7900 GRE offers 1x HDMI 2.1a, 2x DisplayPort 2.1, and 1x USB Type-C, while the MI300 has no display outputs. The RX 7900 GRE also supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, whereas the MI300 has no API support recorded for these interfaces.

Specification Differences

The two cards differ across nearly every measured specification. The MI300 uses the Aqua Vanjaram chip with CDNA 3.0 architecture, while the RX 7900 GRE uses Navi 31 with RDNA 3.0 architecture. Both are fabricated on TSMC's 5 nm process, but the MI300 packs 153,000 million transistors on a 1017 mm² die, compared to 57,700 million on 529 mm² for the RX 7900 GRE. Transistor density also differs: 150.4 million per square millimeter versus 109.1 million.

Clock speeds show the RX 7900 GRE running higher: base clock of 1287 MHz versus 1000 MHz, boost clock of 2245 MHz versus 1700 MHz, and a game clock of 1880 MHz recorded for the RX 7900 GRE only. Memory clocks differ as well, with the MI300 at 1300 MHz (5.2 Gbps effective) and the RX 7900 GRE at 2250 MHz (18 Gbps effective). Memory capacity and type are fundamentally different: 128 GB of HBM3 versus 16 GB of GDDR6. Bus width is 8192 bit versus 256 bit, and bandwidth is 5.32 TB/s versus 576.0 GB/s.

The MI300 has 14,080 shading units and 880 texture mapping units, while the RX 7900 GRE has 5,120 shading units and 320 texture mapping units. The RX 7900 GRE has 160 ROPs and 80 ray tracing cores; the MI300 has zero ROPs and no ray tracing cores. Pixel rate is 0 MPixel/s for the MI300 versus 359.2 GPixel/s for the RX 7900 GRE. Texture rate is 1,496.0 GTexel/s versus 718.4 GTexel/s. FP32 is 47.87 TFLOPS versus 45.98 TFLOPS. FP16 is 47.87 TFLOPS (1:1) versus 91.96 TFLOPS (2:1). TDP is 600 W versus 260 W. Suggested PSU is 1000 W versus 600 W. Bus interface is PCIe 5.0 x16 versus PCIe 4.0 x16. Release dates differ: the MI300 launched on 2023-01-03, and the RX 7900 GRE on 2023-07-26.

Architecture Differences

The MI300 uses CDNA 3.0, AMD's compute-focused architecture, while the RX 7900 GRE uses RDNA 3.0, the graphics-optimized architecture. This explains the absence of ROPs and display outputs on the MI300, as CDNA prioritizes throughput for data center workloads over rasterization and display functionality. The RX 7900 GRE's RDNA 3.0 includes dedicated ray tracing cores, 80 of them, and supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The MI300 has no recorded API support for these graphics interfaces.

The memory architectures reflect their different missions. HBM3 on the MI300 provides massive bandwidth of 5.32 TB/s through an 8192-bit interface, enabling large data movement for compute tasks. GDDR6 on the RX 7900 GRE offers 576.0 GB/s through a 256-bit interface, sufficient for gaming and consumer workloads. The MI300's die size of 1017 mm² is nearly double the RX 7900 GRE's 529 mm², and its transistor count of 153,000 million is 2.65 times higher.

The FP16 ratio difference is notable. The MI300 processes FP16 at a 1:1 ratio with FP32, meaning both hit 47.87 TFLOPS. The RX 7900 GRE processes FP16 at a 2:1 ratio, doubling throughput to 91.96 TFLOPS. This suggests the consumer card can accelerate FP16 workloads more effectively relative to its FP32 performance, while the compute card maintains balanced throughput across both precisions.

Where Each One Wins

The AMD Instinct MI300 wins in memory capacity and bandwidth. Its 128 GB of HBM3 memory dwarfs the RX 7900 GRE's 16 GB, and its 5.32 TB/s bandwidth is over nine times higher. For workloads that require holding large datasets on-card, such as machine learning training or scientific simulation, the MI300's memory subsystem provides a decisive advantage. Its texture rate of 1,496.0 GTexel/s is more than double the RX 7900 GRE's 718.4 GTexel/s, indicating superior texture throughput for compute-heavy rendering tasks. The MI300 also has higher FP32 performance at 47.87 TFLOPS versus 45.98 TFLOPS, and it uses PCIe 5.0 x16 for faster host communication.

The AMD Radeon RX 7900 GRE wins in graphics-specific capabilities. It has 160 ROPs and a pixel rate of 359.2 GPixel/s, while the MI300 has zero ROPs and no pixel output. It includes 80 ray tracing cores for hardware-accelerated ray tracing, which the MI300 lacks entirely. The RX 7900 GRE supports display outputs including HDMI 2.1a, DisplayPort 2.1, and USB Type-C, making it usable for gaming and content creation with monitors. Its FP16 performance of 91.96 TFLOPS is nearly double the MI300's 47.87 TFLOPS, offering better throughput for FP16-optimized workloads. The RX 7900 GRE also has a lower TDP of 260 W versus 600 W, and it supports a broader range of graphics APIs including DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

The benchmark data recorded for the RX 7900 GRE shows strong compute performance in OpenCL at 175,758 and Vulkan at 99,850, along with a Passmark G3D score of 27,089. The MI300 has no recorded benchmarks, so its practical performance in these tests cannot be quantified from the database. The RX 7900 GRE's percentile ranking of 77 places it above the median GPU, while the MI300's ranking of 50 reflects missing data rather than measured capability.

In summary, the MI300 is optimized for raw compute throughput and massive memory capacity, while the RX 7900 GRE is optimized for graphics rendering, ray tracing, and consumer display output. Each card wins in the domain it was designed for, and neither can substitute for the other in their respective use cases.