AMD Instinct MI355X vs AMD Radeon 680M Comparison

Head-to-Head Benchmarks

The database contains no overlapping benchmark scores for the AMD Instinct MI355X and the AMD Radeon 680M. The Instinct MI355X has no recorded benchmark entries, while the Radeon 680M shows three results: a 3DMark Steel Nomad DX12 score of 378, a Geekbench OpenCL score of 23,468, and a Geekbench Vulkan score of 21,965. This absence of shared test data means a direct numeric comparison cannot be established from recorded measurements.

However, the Radeon 680M’s average benchmark score of 15,270 places it at the 57th percentile among all GPUs in the database. Its nearest rivals include the NVIDIA GeForce GTX 580 (average score 15,283, delta -0.1%), the NVIDIA GeForce RTX 2060 (average score 15,290, delta -0.1%), the NVIDIA GeForce RTX 3050 OEM (average score 15,199, delta +0.5%), and the AMD Radeon RX 7600 (average score 15,171, delta +0.7%). These deltas indicate the Radeon 680M sits within a tight performance cluster, trailing the GTX 580 and RTX 2060 by a negligible 0.1% each, while leading the RTX 3050 OEM by 0.5% and the RX 7600 by 0.7%.

For the Instinct MI355X, the recorded percentile stands at 50, with an average benchmark score of 0 and no rivals listed. This reflects a lack of validated test data rather than a performance verdict. The Instinct MI355X’s FP32 throughput of 78.64 TFLOPS and texture rate of 2,457.6 GTexel/s vastly exceed the Radeon 680M’s 3.379 TFLOPS and 105.6 GTexel/s, but these are specification-derived figures, not benchmark outcomes. The head-to-head benchmark section therefore contains zero wins for either part, as no shared tests exist.

Architecture Differences

The two AMD products occupy opposite ends of the hardware spectrum. The Instinct MI355X uses the MI350 256CU chip built on CDNA 4.0 architecture, fabricated on a 3 nm process at TSMC. It packs 185,000 million transistors on a 2,380 mm² die, yielding a transistor density of 77.7M per mm². The Radeon 680M uses the Rembrandt+ chip on RDNA 2.0 architecture, also TSMC-fabricated but on a 6 nm node, with 13,100 million transistors across a 208 mm² die, for a density of 63.0M per mm².

The Instinct MI355X is a compute accelerator with 16,384 shading units and 1,024 texture mapping units, but zero ROPs and a pixel rate of 0 MPixel/s. Its FP16 performance matches FP32 at a 1:1 ratio, both at 78.64 TFLOPS. The Radeon 680M, by contrast, is an integrated graphics processor with 768 shading units, 48 TMUs, and 32 ROPs, producing a pixel rate of 70.40 GPixel/s and a texture rate of 105.6 GTexel/s. Its FP16 throughput is 6.758 TFLOPS at a 2:1 ratio, double its FP32 rate of 3.379 TFLOPS.

Memory systems diverge completely. The Instinct MI355X features 288 GB of HBM3e on an 8,192-bit bus, delivering 8.19 TB/s bandwidth, with memory clocks at 2000 MHz (8 Gbps effective). The Radeon 680M uses system-shared memory, with its bus width, type, and bandwidth all listed as system dependent, meaning performance scales with the host platform’s memory. The Instinct MI355X has no display outputs and lists DirectX, OpenGL, and Vulkan APIs as N/A, while the Radeon 680M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, with display outputs described as portable device dependent.

Power and physical design reinforce the split. The Instinct MI355X carries a TDP of 1,400 W, uses an OAM module slot, requires an 1,800 W suggested PSU, and has no power connectors (likely relying on the module interface). Its dimensions are 102 mm (4 inches) in length and 165 mm (6.5 inches) in width, with a PCIe 5.0 x16 bus interface. The Radeon 680M operates at 50 W TDP, is an IGP with no slot width, no power connectors, and no suggested PSU, using a PCIe 4.0 x8 interface. The Radeon 680M’s base clock is 2000 MHz with a boost of 2200 MHz, while the Instinct MI355X runs at a 1000 MHz base and 2400 MHz boost.

The Instinct MI355X belongs to the Instinct (MIx) generation, released on 2025-06-11, with a predecessor named Radeon Instinct. The Radeon 680M comes from the Navi II IGP (Rembrandt Mobile) generation, released on 2023-01-02, with a predecessor of Vega II IGP and a successor of Navi III IGP. Production status for the Instinct MI355X is not recorded, while the Radeon 680M is listed as active.

The Verdict

The data indicates two distinct products with no benchmark overlap. The Instinct MI355X is a data-center accelerator aimed at compute workloads, as evidenced by its massive memory pool, extreme bandwidth, and absence of display outputs or consumer graphics API support. The Radeon 680M is an integrated GPU for mobile systems, with display output capability, full DirectX 12 Ultimate support, and a 57th percentile ranking among all GPUs.

From recorded measurements, the Radeon 680M has a validated average benchmark score of 15,270, placing it competitively against discrete GPUs like the RTX 2060 and GTX 580 (both within 0.1% delta). The Instinct MI355X has no benchmark scores, so its percentile of 50 reflects missing data, not a measured performance level. Specification comparisons favor the Instinct MI355X dramatically in raw throughput (FP32 at 78.64 TFLOPS versus 3.379 TFLOPS), texture rate (2,457.6 GTexel/s versus 105.6 GTexel/s), and memory bandwidth (8.19 TB/s versus system dependent), but these are theoretical maxima, not validated results.

Users seeking a measured, working graphics solution with driver support and display outputs should consider the Radeon 680M, which has concrete benchmark results and a competitive standing against known rivals. Users targeting high-performance compute without needing graphics output would look at the Instinct MI355X, but the database lacks any benchmark verification for it. The choice hinges on whether the workload requires the accelerator’s extreme memory and compute specifications or the integrated GPU’s verified performance and feature set.

FAQ

Q: Does the AMD Instinct MI355X have any benchmark scores in the database?

A: No benchmark scores are recorded for the Instinct MI355X. Its average benchmark score is listed as 0, and its percentile of 50 reflects the absence of validated test data.

Q: What benchmark results does the AMD Radeon 680M show?

A: The Radeon 680M has three recorded results: 3DMark Steel Nomad DX12 at 378, Geekbench OpenCL at 23,468, and Geekbench Vulkan at 21,965, producing an average score of 15,270.

Q: How does the Radeon 680M compare to its nearest rivals?

A: The Radeon 680M trails the NVIDIA GeForce GTX 580 (15,283) and RTX 2060 (15,290) by 0.1% each, while leading the RTX 3050 OEM (15,199) by 0.5% and the AMD Radeon RX 7600 (15,171) by 0.7%.

Q: What memory configuration does the Instinct MI355X use?

A: The Instinct MI355X uses 288 GB of HBM3e memory on an 8,192-bit bus, providing 8.19 TB/s bandwidth with a memory clock of 2000 MHz (8 Gbps effective).

Q: What is the process node difference between the two chips?

A: The Instinct MI355X uses a 3 nm TSMC process with 185,000 million transistors on a 2,380 mm² die, while the Radeon 680M uses a 6 nm TSMC process with 13,100 million transistors on a 208 mm² die.

Q: Does the Radeon 680M support ray tracing?

A: Yes, the Radeon 680M lists 12 ray tracing cores and supports DirectX 12 Ultimate (12_2), along with OpenGL 4.6 and Vulkan 1.4.

Where Each One Wins

The Instinct MI355X wins on raw compute specifications. Its FP32 performance of 78.64 TFLOPS is over 23 times the Radeon 680M’s 3.379 TFLOPS. Texture rate reaches 2,457.6 GTexel/s versus 105.6 GTexel/s, and memory bandwidth hits 8.19 TB/s against the Radeon 680M’s system-dependent value. The accelerator also offers 288 GB of dedicated HBM3e, compared to the integrated GPU’s shared memory. The 1:1 FP16/FP32 ratio on the Instinct MI355X contrasts with the Radeon 680M’s 2:1 ratio, indicating different precision handling priorities.

The Radeon 680M wins on actual measured performance and features. It has three benchmark scores with an average of 15,270, placing it at the 57th percentile, whereas the Instinct MI355X has no validated results. The integrated GPU provides display outputs, supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, and includes 12 ray tracing cores. Its 70.40 GPixel/s pixel rate indicates rendering capability, while the Instinct MI355X’s 0 MPixel/s confirms no rasterization role. The Radeon 680M also operates at 50 W TDP compared to 1,400 W, though power efficiency is not directly scored. The Radeon 680M’s production status is active, while the Instinct MI355X’s status is unrecorded.

Specification Differences

The two products differ in every major specification category. The Instinct MI355X uses a 3 nm process with 185,000 million transistors and a 2,380 mm² die, while the Radeon 680M uses a 6 nm process with 13,100 million transistors and a 208 mm² die. Transistor density favors the Instinct MI355X at 77.7M per mm² versus 63.0M per mm².

Clock speeds show a 1000 MHz base on the Instinct MI355X versus 2000 MHz on the Radeon 680M, with boosts of 2400 MHz and 2200 MHz respectively. Memory differs absolutely: 288 GB HBM3e with 8,192-bit bus and 8.19 TB/s bandwidth on the accelerator, versus system-shared memory with system-dependent bandwidth on the integrated GPU. Compute units scale from 768 shading units on the Radeon 680M to 16,384 on the Instinct MI355X, with TMUs at 48 versus 1,024. The Radeon 680M has 32 ROPs and 12 ray tracing cores, while the Instinct MI355X has 0 ROPs and no listed ray tracing cores.

Pixel rate is 70.40 GPixel/s on the Radeon 680M versus 0 MPixel/s on the Instinct MI355X. Texture rate reaches 2,457.6 GTexel/s on the accelerator versus 105.6 GTexel/s on the integrated GPU. FP32 performance is 78.64 TFLOPS versus 3.379 TFLOPS, with FP16 at 78.64 TFLOPS (1:1) versus 6.758 TFLOPS (2:1). Power consumption spans 1,400 W versus 50 W. The Instinct MI355X uses an OAM module slot with an 1,800 W suggested PSU, while the Radeon 680M is an IGP with no suggested PSU. Bus interfaces are PCIe 5.0 x16 versus PCIe 4.0 x8. The Instinct MI355X has no display outputs and N/A APIs, while the Radeon 680M offers portable device dependent outputs and full DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 support. Release dates differ by over two years: 2025-06-11 for the Instinct MI355X and 2023-01-02 for the Radeon 680M.