AMD Instinct MI300 vs AMD Radeon RX 9070 XT Comparison

Head-to-Head Benchmarks

The benchmark database contains no recorded test scores for the AMD Instinct MI300, leaving its average benchmark score at 0. The AMD Radeon RX 9070 XT, in contrast, has an extensive suite of recorded measurements. The RX 9070 XT delivers an average benchmark score of 13,543, placing it in the 55th percentile of all GPUs tracked. The MI300 sits in the 50th percentile, but this is based on zero recorded data points, so the comparison is strictly one-sided on paper.

The RX 9070 XT's strongest recorded result comes from the Geekbench Vulkan test, where it scores 65,879. This is dramatically higher than its OpenCL score of 17,428, indicating that the RDNA 4.0 architecture has a particularly strong affinity for Vulkan workloads. In the 3DMark Steel Nomad DX12 test, the card records 7,260 points, a solid result for a modern gaming GPU. The PassMark suite shows a G3D score of 26,795 and a GPU compute score of 15,864, with DirectX 9 scoring 353, DirectX 11 scoring 292, and DirectX 10 scoring 154. The DirectX 12 score in PassMark is notably lower at 78, suggesting that this particular benchmark suite does not align well with the card's DX12 path. The 2D graphics score is 1,328.

Because the MI300 has no benchmark entries, there are no direct head-to-head deltas to compute. The data simply shows that the RX 9070 XT is a fully measured product while the MI300 is an unmeasured one. The nearest rivals for the RX 9070 XT are all older or lower-tier cards: the AMD Radeon HD 7770M at 13,536 average score (0.1% behind), the NVIDIA GeForce GTX 570 at 13,515 (0.2% behind), the NVIDIA P106-090 at 13,470 (0.5% behind), and the AMD Radeon Pro 555 at 13,407 (1.0% behind). These deltas are all within 1%, meaning the RX 9070 XT's average score is only marginally ahead of these legacy parts in the database's aggregated metrics, despite being a far newer and more capable product in raw specifications.

Where Each One Wins

The RX 9070 XT wins every category where data exists. It has a complete set of API support with DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the MI300 lists N/A for all three APIs. The MI300 has no display outputs, making it unsuitable for any visual workload that requires a monitor connection. The RX 9070 XT provides 1x HDMI 2.1b and 3x DisplayPort 2.1a outputs, enabling multi-display setups.

In compute density, the two chips are nearly identical per square millimeter. The MI300 packs 153,000 million transistors on a 1017 mm² die, yielding a transistor density of 150.4M per mm². The RX 9070 XT packs 53,900 million transistors on a 357 mm² die, yielding 151.0M per mm². The newer 4 nm process node of the RX 9070 XT versus the 5 nm node of the MI300 explains how a smaller chip achieves nearly the same density.

The MI300 wins decisively in memory capacity and bandwidth. It carries 128 GB of HBM3 on an 8192-bit bus, delivering 5.32 TB/s of bandwidth. The RX 9070 XT has 16 GB of GDDR6 on a 256-bit bus, delivering 644.6 GB/s. That is roughly 8.3 times more bandwidth for the MI300, a gap that matters for large-scale compute workloads but is irrelevant for gaming-oriented tasks. The MI300 also has far more shading units (14,080 versus 4,096), TMUs (880 versus 256), and a higher texture rate (1,496.0 GTexel/s versus 760.3 GTexel/s). The MI300's FP32 throughput is 47.87 TFLOPS, slightly below the RX 9070 XT's 48.66 TFLOPS, despite the massive difference in shader count. The RX 9070 XT achieves this with far fewer cores thanks to its much higher clock speeds: a boost of 2970 MHz versus 1700 MHz for the MI300.

Architecture Differences

The MI300 is built on CDNA 3.0, AMD's compute-focused architecture, using the Aqua Vanjaram chip. The RX 9070 XT is built on RDNA 4.0, AMD's graphics-focused architecture, using the Navi 48 chip. These are fundamentally different designs aimed at different markets. The MI300 belongs to the Instinct (MIx) generation, while the RX 9070 XT belongs to the Radeon RX 9000 series, specifically the Navi IV (RX 9000) generation. The MI300's predecessor is the Radeon Instinct, while the RX 9070 XT's predecessor is Navi III.

The process nodes differ: the MI300 uses 5 nm TSMC, while the RX 9070 XT uses 4 nm TSMC. Both are fabricated by TSMC, but the newer node gives the RX 9070 XT a density advantage per transistor. The MI300's die is 1017 mm², nearly three times larger than the RX 9070 XT's 357 mm². The transistor counts reflect this: 153,000 million for the MI300 versus 53,900 million for the RX 9070 XT.

Memory architecture is entirely different. The MI300 uses HBM3 with a colossal 8192-bit bus, while the RX 9070 XT uses GDDR6 with a 256-bit bus. The MI300 has no ROPs (0 MPixel/s pixel rate), confirming it is not designed for rasterized graphics output. The RX 9070 XT has 128 ROPs and a pixel rate of 380.2 GPixel/s. The MI300 has no ray tracing cores listed, while the RX 9070 XT has 64 RT cores. Neither card lists tensor cores.

The MI300 has no display outputs and no API support, reinforcing its role as an accelerator for server or datacenter compute. The RX 9070 XT is a fully featured consumer graphics card with modern API support. Power requirements differ sharply: the MI300 draws 600 W with a suggested PSU of 1000 W, while the RX 9070 XT draws 304 W with a suggested PSU of 700 W. Both use 2x 8-pin power connectors. The MI300 is 267 mm long and 111 mm tall, while the RX 9070 XT has no recorded dimensions. The MI300 has no slot width recorded, while the RX 9070 XT is dual-slot.

FAQ

Q: Why does the AMD Instinct MI300 have no benchmark scores in the database?

A: The MI300 has an empty benchmarks array, resulting in an average benchmark score of 0 and a 50th percentile ranking. The RX 9070 XT has 10 recorded benchmark scores across 3DMark, Geekbench, and PassMark tests, giving it a 55th percentile ranking and an average score of 13,543.

Q: Which card has higher FP32 compute throughput?

A: The RX 9070 XT edges out the MI300 with 48.66 TFLOPS versus 47.87 TFLOPS, despite having only 4,096 shading units compared to 14,080. The RX 9070 XT achieves this with a 2970 MHz boost clock versus 1700 MHz for the MI300.

Q: How do the memory systems compare?

A: The MI300 uses 128 GB of HBM3 on an 8192-bit bus with 5.32 TB/s bandwidth. The RX 9070 XT uses 16 GB of GDDR6 on a 256-bit bus with 644.6 GB/s bandwidth. The MI300 has approximately 8.3 times the memory bandwidth.

Q: Can the MI300 output video to a display?

A: No. The MI300 lists "No outputs" for display outputs, and its DirectX, OpenGL, and Vulkan support are all marked N/A. The RX 9070 XT provides 1x HDMI 2.1b and 3x DisplayPort 2.1a outputs.

Q: What are the power requirements for each card?

A: The MI300 has a TDP of 600 W and requires a suggested PSU of 1000 W. The RX 9070 XT has a TDP of 304 W and requires a suggested PSU of 700 W. Both use 2x 8-pin power connectors.

Q: Which card has a higher transistor density?

A: The RX 9070 XT has a slightly higher density at 151.0M transistors per mm², versus 150.4M per mm² for the MI300. This is despite the MI300 having 153,000 million transistors on a 1017 mm² die, while the RX 9070 XT has 53,900 million on a 357 mm² die.

The Verdict

The data presents two products with almost no overlap in measured performance. The MI300 is a compute accelerator with no display outputs, no API support, and no benchmark scores. Its 128 GB of HBM3 and 5.32 TB/s bandwidth position it for memory-intensive datacenter workloads, but the database contains no evidence of its real-world compute performance. The RX 9070 XT is a fully validated consumer GPU with a complete benchmark profile, API support, and display connectivity.

For anyone selecting a card for graphics rendering or gaming, the RX 9070 XT is the only option with recorded performance data. Its Vulkan score of 65,879 and 3DMark Steel Nomad score of 7,260 confirm it can handle modern graphics workloads. The MI300 cannot even be tested in these scenarios because it lacks the necessary outputs and API support.

For compute-heavy tasks requiring massive memory capacity, the MI300's specifications suggest it is the stronger choice, but the absence of benchmark data means there is no measured confirmation. The RX 9070 XT's compute score of 15,864 in PassMark and OpenCL score of 17,428 provide some evidence of its compute capability, but these are far below what the MI300's hardware could theoretically deliver given its 8x bandwidth advantage.

The release dates tell a clear story: the MI300 launched on 2023-01-03, while the RX 9070 XT launched on 2025-03-05. The RX 9070 XT is the newer product and the only one with active production status. The MI300's production status is not recorded. The RX 9070 XT carries a launch MSRP of 599 USD, while the MI300 has no recorded launch MSRP.

Specification Differences

| Field | AMD Instinct MI300 | AMD Radeon RX 9070 XT |

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

| Series | None | Radeon RX 9000 series |

| Chip | Aqua Vanjaram | Navi 48 |

| Architecture | CDNA 3.0 | RDNA 4.0 |

| Generation | Instinct (MIx) | Navi IV (RX 9000) |

| Process node | 5 nm | 4 nm |

| Transistors | 153,000 million | 53,900 million |

| Die size | 1017 mm² | 357 mm² |

| Transistor density | 150.4M / mm² | 151.0M / mm² |

| Base clock | 1000 MHz | 1660 MHz |

| Boost clock | 1700 MHz | 2970 MHz |

| Game clock | None | 2400 MHz |

| Memory clock | 1300 MHz 5.2 Gbps effective | 2518 MHz 20.1 Gbps effective |

| Memory size | 128 GB | 16 GB |

| Memory type | HBM3 | GDDR6 |

| Memory bus width | 8192 bit | 256 bit |

| Memory bandwidth | 5.32 TB/s | 644.6 GB/s |

| Shading units | 14080 | 4096 |

| TMUs | 880 | 256 |

| ROPs | 0 | 128 |

| RT cores | None | 64 |

| Pixel rate | 0 MPixel/s | 380.2 GPixel/s |

| Texture rate | 1,496.0 GTexel/s | 760.3 GTexel/s |

| FP32 | 47.87 TFLOPS | 48.66 TFLOPS |

| FP16 | 47.87 TFLOPS (1:1) | 48.66 TFLOPS (1:1) |

| TDP | 600 W | 304 W |

| Slot width | None | Dual-slot |

| Suggested PSU | 1000 W | 700 W |

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

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

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.4 |

| Dimensions | 267 mm x 111 mm | None recorded |

| Production status | None | Active |

| Release date | 2023-01-03 | 2025-03-05 |

| Predecessor | Radeon Instinct | Navi III |

| Launch MSRP | None | 599 USD |

| Average benchmark score | 0 | 13,543 |

| Percentile vs all GPUs | 50 | 55 |