AMD Instinct MI308X vs NVIDIA GeForce RTX 4070 Mobile Comparison

The Verdict

The AMD Instinct MI308X and NVIDIA GeForce RTX 4070 Mobile occupy fundamentally different positions in the hardware landscape. The MI308X is a data-center compute accelerator with no display outputs, no graphics API support, and a 750 W power envelope. The RTX 4070 Mobile is an integrated laptop GPU with full DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 support, running at 115 W. The database shows no benchmark entries for the MI308X, while the RTX 4070 Mobile has recorded scores across nine tests. Its average benchmark score of 27,435 places it at the 73rd percentile of all GPUs, with nearest rivals including the AMD Radeon RX 6700 XT at a 0% delta, the NVIDIA GeForce RTX 3090 at -0.5%, the NVIDIA RTX PRO 4000 Blackwell at 1.1%, and the AMD Radeon Pro Vega 20 at -1.5%. The MI308X holds a 50th percentile ranking with zero recorded benchmark scores. The data indicates the RTX 4070 Mobile is the only option with measurable performance, while the MI308X is a specialized compute part whose capabilities are not captured by standard graphics benchmarks. Users requiring a mobile graphics solution with software ecosystem support should select the RTX 4070 Mobile; the MI308X is appropriate only for compute workloads that do not require display output or graphics API compatibility.

FAQ

Q: Which GPU has higher raw FP32 compute throughput?

A: The AMD Instinct MI308X delivers 81.72 TFLOPS FP32, which is 5.23 times higher than the RTX 4070 Mobile's 15.62 TFLOPS FP32. Both achieve a 1:1 FP16 to FP32 ratio.

Q: How do the memory configurations compare?

A: The MI308X uses 192 GB of HBM3 on an 8192-bit bus, providing 5.32 TB/s of bandwidth. The RTX 4070 Mobile has 8 GB of GDDR6 on a 128-bit bus, delivering 256.0 GB/s. The MI308X offers 24 times the memory capacity and approximately 20.8 times the bandwidth.

Q: What graphics API support does each GPU provide?

A: The RTX 4070 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI308X has no API support recorded; its DirectX, OpenGL, and Vulkan fields are all marked N/A, and it has no display outputs.

Q: What is the thermal design power difference?

A: The MI308X has a TDP of 750 W with a suggested PSU of 1150 W. The RTX 4070 Mobile operates at 115 W and has no suggested PSU listed, consistent with its integrated laptop form factor.

Q: How does the RTX 4070 Mobile rank against its nearest rivals?

A: The RTX 4070 Mobile's average benchmark score of 27,435 places it within 1.5% of all four nearest rivals. It trails the AMD Radeon Pro Vega 20 by 1.5%, sits level with the AMD Radeon RX 6700 XT at 0%, trails the NVIDIA GeForce RTX 3090 by 0.5%, and leads the NVIDIA RTX PRO 4000 Blackwell by 1.1%.

Q: What are the transistor and die size differences?

A: The MI308X contains 153,000 million transistors on a 1017 mm² die, achieving a density of 150.4M per mm². The RTX 4070 Mobile has 22,900 million transistors on a 188 mm² die, with a density of 121.8M per mm². Both use a 5 nm process at TSMC.

Architecture Differences

The AMD Instinct MI308X uses the CDNA 3.0 architecture with the Aqua Vanjaram chip, while the NVIDIA GeForce RTX 4070 Mobile uses the Ada Lovelace architecture with the AD106 chip. The MI308X is part of the Instinct (MIx) generation and succeeds the Radeon Instinct line. The RTX 4070 Mobile belongs to the GeForce 40-series and GeForce 40 Mobile generation, succeeding the GeForce 30 Mobile and preceding the GeForce 50 Mobile.

The MI308X has no ray tracing cores and no tensor cores listed in the database. The RTX 4070 Mobile includes 36 ray tracing cores and 144 tensor cores, providing hardware acceleration for ray-traced graphics and AI inference workloads. The MI308X has 19,456 shading units, 1,216 texture mapping units, and zero ROPs, resulting in a pixel rate of 0 MPixel/s. The RTX 4070 Mobile has 4,608 shading units, 144 TMUs, and 48 ROPs, with a pixel rate of 81.36 GPixel/s.

The MI308X uses an OAM module slot width with no power connectors and no display outputs. The RTX 4070 Mobile is an IGP (integrated graphics processor) with no power connectors and display outputs marked as portable device dependent. The MI308X supports PCIe 5.0 x16, while the RTX 4070 Mobile uses PCIe 4.0 x8. The MI308X has no recorded API support, whereas the RTX 4070 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

The MI308X was released on 2023-12-05, while the RTX 4070 Mobile was released on 2023-01-02. The RTX 4070 Mobile has an active production status; the MI308X has no production status recorded. The transistor densities differ notably, with the MI308X at 150.4M per mm² and the RTX 4070 Mobile at 121.8M per mm², despite both using TSMC 5 nm.

Specification Differences

The memory subsystems differ substantially. The MI308X uses HBM3 with 192 GB capacity, an 8192-bit bus, and 5.32 TB/s bandwidth. The RTX 4070 Mobile uses GDDR6 with 8 GB capacity, a 128-bit bus, and 256.0 GB/s bandwidth. The effective memory clocks are 5.2 Gbps for the MI308X and 16 Gbps for the RTX 4070 Mobile.

The compute resources differ in scale. The MI308X has 19,456 shading units versus 4,608 for the RTX 4070 Mobile, a 4.2-fold difference. TMUs number 1,216 versus 144, a 8.4-fold difference. The MI308X has 0 ROPs while the RTX 4070 Mobile has 48. The RTX 4070 Mobile adds 36 ray tracing cores and 144 tensor cores; the MI308X has neither listed.

Clock speeds differ as well. The MI308X has a base clock of 1000 MHz and a boost clock of 2100 MHz. The RTX 4070 Mobile has a base clock of 1395 MHz and a boost clock of 1695 MHz. The MI308X has a higher boost clock by 405 MHz, but the RTX 4070 Mobile has a higher base clock by 395 MHz.

The texture and pixel rates reflect the architectural differences. The MI308X achieves 2,553.6 GTexel/s texture rate with a 0 MPixel/s pixel rate. The RTX 4070 Mobile achieves 244.1 GTexel/s texture rate and 81.36 GPixel/s pixel rate. The MI308X delivers 81.72 TFLOPS for both FP32 and FP16; the RTX 4070 Mobile delivers 15.62 TFLOPS for both.

The power requirements differ by a factor of 6.5. The MI308X has a TDP of 750 W with a suggested PSU of 1150 W. The RTX 4070 Mobile has a TDP of 115 W with no suggested PSU listed. The MI308X has a die size of 1017 mm² with 153,000 million transistors; the RTX 4070 Mobile has a die size of 188 mm² with 22,900 million transistors. Neither product has a recorded launch MSRP.

Head-to-Head Benchmarks

The database contains no head-to-head benchmark entries comparing the MI308X and RTX 4070 Mobile. The MI308X has no individual benchmark scores recorded, while the RTX 4070 Mobile has nine recorded benchmark results. The comparison therefore relies on the RTX 4070 Mobile's measured performance and the MI308X's architectural specifications.

The RTX 4070 Mobile's strongest recorded scores include a Geekbench OpenCL score of 109,197 and a Geekbench Vulkan score of 108,367. Its Passmark scores are 19,587 for G3D, 8,399 for GPU compute, 763 for G2D, 223 for DirectX 9, 179 for DirectX 11, 116 for DirectX 10, and 85 for DirectX 12. The average benchmark score across all tests is 27,435, placing it at the 73rd percentile of all GPUs.

The nearest rival data provides context for the RTX 4070 Mobile's standing. The AMD Radeon RX 6700 XT scores 27,425, a 0% delta. The NVIDIA GeForce RTX 3090 scores 27,565, a -0.5% delta relative to the RTX 4070 Mobile. The NVIDIA RTX PRO 4000 Blackwell scores 27,135, a 1.1% delta. The AMD Radeon Pro Vega 20 scores 27,839, a -1.5% delta. These figures indicate the RTX 4070 Mobile performs within a narrow 1.5% band of four very different desktop and workstation GPUs, despite its mobile form factor and lower TDP.

The MI308X holds a 50th percentile ranking among all GPUs with an average benchmark score of 0, reflecting the absence of recorded graphics benchmarks. Its compute capabilities are expressed only through raw specifications. The FP32 throughput of 81.72 TFLOPS is 5.23 times the RTX 4070 Mobile's 15.62 TFLOPS. The texture rate of 2,553.6 GTexel/s is 10.5 times the RTX 4070 Mobile's 244.1 GTexel/s. The memory bandwidth of 5.32 TB/s is 20.8 times the RTX 4070 Mobile's 256.0 GB/s.

The RTX 4070 Mobile's pixel rate of 81.36 GPixel/s is the only measurable graphics output capability between the two, since the MI308X records 0 MPixel/s with no ROPs. The RTX 4070 Mobile also provides the only ray tracing and tensor core hardware, with 36 and 144 units respectively. The MI308X's 1,216 TMUs versus the RTX 4070 Mobile's 144 TMUs indicates a 8.4-fold advantage in texture processing hardware.

The release dates show the MI308X arrived 11 months after the RTX 4070 Mobile. The RTX 4070 Mobile has an active production status; the MI308X has none recorded. The MI308X uses PCIe 5.0 x16 versus the RTX 4070 Mobile's PCIe 4.0 x8, providing double the lane width and a newer bus generation for the MI308X. The RTX 4070 Mobile's 5 nm process and 121.8M per mm² transistor density compare to the MI308X's same 5 nm process but higher 150.4M per mm² density, indicating the MI308X packs transistors more tightly on its 1017 mm² die.