AMD Instinct MI300 vs AMD Radeon RX 9070 Comparison

Head-to-Head Benchmarks

The AMD Instinct MI300 and the AMD Radeon RX 9070 represent fundamentally different design goals within AMD's product stack. The recorded data shows a stark contrast in their performance profiles, with the MI300 being a massive compute-oriented accelerator and the RX 9070 being a current-generation consumer graphics card.

The most significant disparity lies in raw compute throughput. The Instinct MI300 delivers 47.87 TFLOPS of FP32 performance, while the RX 9070 achieves 36.13 TFLOPS. This represents a 32.5% advantage for the MI300 in raw floating-point calculations. The gap narrows in texture processing, where the MI300's 1,496.0 GTexel/s compares to the RX 9070's 564.5 GTexel/s, a 165% lead for the accelerator.

Memory bandwidth is where the MI300 completely dominates. The 128 GB HBM3 pool with an 8192-bit bus produces 5.32 TB/s of bandwidth, versus the RX 9070's 16 GB GDDR6 on a 256-bit bus yielding 644.6 GB/s. The MI300 offers roughly 8.25 times the memory bandwidth, which is critical for large-scale data workloads but irrelevant for gaming framebuffers.

However, the RX 9070 wins decisively in pixel processing. The MI300 has a pixel rate of 0 MPixel/s and zero ROPs, meaning it cannot rasterize at all. The RX 9070 delivers 322.6 GPixel/s from its 128 ROPs, making it the only one of the two capable of producing graphical output. The MI300 also has no display outputs, while the RX 9070 provides 1x HDMI 2.1b and 3x DisplayPort 2.1a.

Clock speeds favor the consumer card. The RX 9070 runs at a 1330 MHz base and 2520 MHz boost, with a 2070 MHz game clock. The MI300 operates at a 1000 MHz base and 1700 MHz boost. The RX 9070's higher frequencies help it extract more performance per compute unit, even with far fewer total units.

The benchmark database records no head-to-head benchmark scores for these two products. The MI300 has no average benchmark score and sits at the 50th percentile in the database, while the RX 9070 has substantial benchmark data. The RX 9070 achieves an average benchmark score of 23,877, placing it in the 69th percentile of all GPUs. Its nearest rivals include the NVIDIA GeForce GTX TITAN Z at 23,736 (0.6% behind), the AMD Radeon RX 6800S at 24,063 (0.8% ahead), the NVIDIA GeForce RTX 3080 Mobile at 23,628 (1.1% behind), and the NVIDIA GeForce RTX 2080 SUPER at 24,170 (1.2% ahead).

Where Each One Wins

The Instinct MI300 wins in compute density and memory capacity. Its 153,000 million transistors on a 1017 mm² die (150.4M per mm²) represent the extreme high end of accelerator design. The 14080 shading units and 880 TMUs provide massive parallel throughput for scientific computing, AI inference, and data-center workloads. The 5 nm process from TSMC allows this density without exceeding the 600 W TDP, which requires a 1000 W suggested PSU and 2x 8-pin power connectors.

The RX 9070 wins in every consumer-facing metric. Its 53,900 million transistors on a 357 mm² die (151.0M per mm²) show a more efficient density on the newer 4 nm process. The 3584 shading units, 224 TMUs, and 128 ROPs are sufficient for modern gaming at high resolutions. The 56 ray-tracing cores enable hardware-accelerated ray tracing, a feature entirely absent from the MI300. The RX 9070's 220 W TDP, dual-slot design, and 550 W suggested PSU make it practical for desktop installation, and its DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4 API support covers all modern graphics standards. The MI300 reports N/A for all three APIs.

In memory technology, the MI300 uses HBM3 with 5.2 Gbps effective speed at 1300 MHz, while the RX 9070 uses GDDR6 at 20.1 Gbps effective from a 2518 MHz memory clock. The RX 9070's faster per-pin speed is typical of GDDR6, but the MI300's 8192-bit bus width overwhelms it in aggregate bandwidth.

Benchmark data exists only for the RX 9070. Its Geekbench OpenCL score of 131,539 and Vulkan score of 58,705 indicate strong compute capability in consumer contexts. PassMark scores show 25,381 in G3D, 14,737 in GPU compute, 343 in DirectX 9, 281 in DirectX 11, 141 in DirectX 10, and 74 in DirectX 12. The 3DMark Steel Nomad DX12 score is 6,290. These figures place it firmly in the upper tier of consumer GPUs, competing closely with the GTX TITAN Z and RTX 2080 SUPER.

The Verdict

The data indicates that these two products serve entirely different markets with minimal overlap. The Instinct MI300 is an accelerator with no display output, no rasterization hardware, and no graphics API support. It is designed for compute-heavy environments where 128 GB of HBM3 and 5.32 TB/s bandwidth matter more than any graphical capability. Its 47.87 TFLOPS FP32 and FP16 (1:1) performance targets large-scale parallel workloads.

The Radeon RX 9070 is a complete consumer graphics card. It produces pixels at 322.6 GPixel/s, supports modern graphics APIs, and provides display connectivity. Its 36.13 TFLOPS FP32 and FP16 (1:1) performance, while lower than the MI300, is more than adequate for gaming and content creation. The 16 GB GDDR6 memory with 644.6 GB/s bandwidth suits high-resolution textures and ray-traced scenes.

The decisive factor is the RX 9070's benchmark presence. With an average score of 23,877 and a 69th percentile ranking, it demonstrates real-world performance that the MI300 cannot claim in the database. The MI300's 50th percentile and absence of benchmark scores reflect its niche positioning.

Users requiring a graphics card should choose the RX 9070. Users requiring a pure compute accelerator with massive memory capacity should choose the MI300. The choice is not about performance superiority but about workload compatibility. The RX 9070 has a launch MSRP of 549 USD, while the MI300 has no listed launch MSRP.

FAQ

Q: Which card has higher FP32 compute performance?

A: The AMD Instinct MI300 delivers 47.87 TFLOPS FP32, while the AMD Radeon RX 9070 delivers 36.13 TFLOPS, giving the MI300 a 32.5% advantage.

Q: Can the Instinct MI300 output video to a display?

A: No. The MI300 has no display outputs and a pixel rate of 0 MPixel/s with 0 ROPs. The RX 9070 provides 1x HDMI 2.1b and 3x DisplayPort 2.1a outputs.

Q: What is the memory bandwidth difference?

A: The MI300 has 5.32 TB/s bandwidth from 128 GB HBM3 on an 8192-bit bus. The RX 9070 has 644.6 GB/s from 16 GB GDDR6 on a 256-bit bus. The MI300 offers approximately 8.25 times the bandwidth.

Q: Does the RX 9070 support ray tracing?

A: Yes, the RX 9070 includes 56 ray-tracing cores. The MI300 has no ray-tracing hardware listed in its specifications.

Q: What API support does each card offer?

A: The RX 9070 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI300 reports N/A for all graphics APIs.

Q: How does the RX 9070 compare to its nearest rivals?

A: The RX 9070's average benchmark score of 23,877 is 0.6% ahead of the GTX TITAN Z, 0.8% behind the RX 6800S, 1.1% ahead of the RTX 3080 Mobile, and 1.2% behind the RTX 2080 SUPER.

Architecture Differences

The Instinct MI300 uses the Aqua Vanjaram chip built on CDNA 3.0 architecture, manufactured on a 5 nm process at TSMC. The Radeon RX 9070 uses the Navi 48 chip with RDNA 4.0 architecture, manufactured on a 4 nm process at TSMC. Both come from AMD but target completely different architectural philosophies.

The MI300 die measures 1017 mm² and contains 153,000 million transistors, resulting in a density of 150.4 million transistors per mm². The RX 9070 die measures 357 mm² with 53,900 million transistors, achieving 151.0 million per mm². The nearly identical density figures show that both processes handle transistor packing similarly, but the MI300's die is nearly three times larger.

Compute unit counts differ substantially. The MI300 has 14,080 shading units and 880 TMUs, while the RX 9070 has 3,584 shading units and 224 TMUs. The MI300 has no ROPs, while the RX 9070 has 128. The RX 9070 adds 56 ray-tracing cores, which the MI300 lacks entirely.

Clock speeds favor the RX 9070. Its 1330 MHz base and 2520 MHz boost clocks exceed the MI300's 1000 MHz base and 1700 MHz boost. Memory clocks also differ: the MI300 runs at 1300 MHz (5.2 Gbps effective) for HBM3, while the RX 9070 runs at 2518 MHz (20.1 Gbps effective) for GDDR6.

Power requirements reflect their roles. The MI300 draws 600 W TDP with a 1000 W suggested PSU, while the RX 9070 draws 220 W TDP with a 550 W suggested PSU. Both use 2x 8-pin power connectors, but the RX 9070 fits a dual-slot design, while the MI300 has no slot width listed.

The RX 9070 is an active production product with a release date of 2025-03-05, succeeding the Navi III generation. The MI300 released on 2023-01-03, succeeding the Radeon Instinct line. The RX 9070 supports modern graphics APIs, while the MI300 has no API support recorded. The MI300 measures 267 mm in length and 111 mm in height, while the RX 9070 dimensions are not listed.

The RX 9070's transistor density of 151.0M per mm² slightly exceeds the MI300's 150.4M per mm², indicating that the newer 4 nm process packs transistors marginally tighter than the 5 nm process. This efficiency, combined with higher clock speeds, lets the RX 9070 achieve 36.13 TFLOPS from a much smaller chip. The MI300 compensates with sheer scale: nearly four times the shading units and over three times the texture units deliver 47.87 TFLOPS despite lower clocks.