AMD Instinct MI325X vs AMD Radeon 8065S Comparison

The Verdict

The AMD Instinct MI325X and AMD Radeon 8065S serve fundamentally different purposes, and the data confirms they should never be cross-shopped. The MI325X is a data center accelerator built around CDNA 3.0, engineered for massive parallel workloads with 256 GB of HBM3e memory and 81.72 TFLOPS of FP32 compute. The Radeon 8065S is a mobile integrated graphics processor using RDNA 3.5, designed for portable devices with shared system memory and a 55 W power envelope. Neither part is a substitute for the other.

The MI325X targets compute environments where memory capacity and throughput dominate. Its 8192-bit memory bus delivers 6.14 TB/s of bandwidth, a figure that categorically separates it from the Radeon 8065S, which relies on system shared memory with bandwidth described as system dependent. The Radeon 8065S, by contrast, fits into the portable device segment, shipping as an IGP with display outputs dependent on the host device and no standalone power connectors.

For buyers with server or accelerator needs, the MI325X is the only choice between these two. For mobile or embedded designs requiring graphics output and modern API support, the Radeon 8065S is the appropriate option. The MI325X has no display outputs and lists DirectX, OpenGL, and Vulkan support as N/A, making it unsuitable for any client-facing graphics workload. The Radeon 8065S supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, making it a functional graphics solution for portable systems.

FAQ

Q: Which GPU has higher raw compute throughput?

A: The MI325X delivers 81.72 TFLOPS in both FP32 and FP16, while the Radeon 8065S delivers 15.36 TFLOPS in both FP32 and FP16. The MI325X provides more than five times the FP32 compute.

Q: Can either GPU be used for gaming?

A: The Radeon 8065S supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, making it suitable for modern gaming APIs. The MI325X lists all graphics APIs as N/A and has no display outputs, so it cannot drive a display or run client gaming workloads.

Q: How much memory does each GPU have?

A: The MI325X has 256 GB of HBM3e memory on an 8192-bit bus. The Radeon 8065S uses system shared memory, with its size, type, bus width, and bandwidth all dependent on the host system.

Q: What is the power requirement difference?

A: The MI325X has a TDP of 1000 W and a suggested PSU of 1400 W. The Radeon 8065S has a TDP of 55 W and no suggested PSU listed, reflecting its integrated mobile design.

Q: Which GPU is physically larger?

A: The MI325X uses an OAM Module slot width, indicating a large accelerator form factor. The Radeon 8065S is an IGP, meaning it is integrated into a processor package rather than installed as a discrete board.

Q: What manufacturing process does each use?

A: The MI325X uses a 5 nm process at TSMC with 153,000 million transistors on a 1017 mm² die. The Radeon 8065S uses a 4 nm process at TSMC with a 308 mm² die and unknown transistor count.

Architecture Differences

The MI325X is built on CDNA 3.0, AMD's compute-optimized architecture designed specifically for data center acceleration. Its chip, codenamed Aqua Vanjaram, uses a 5 nm process from TSMC and packs 153,000 million transistors onto a 1017 mm² die, yielding a transistor density of 150.4 million transistors per square millimeter. The architecture prioritizes raw throughput and memory bandwidth over graphics features. This is reflected in its zero ROPs, zero pixel rate, and absence of ray tracing cores. The MI325X does not expose graphics APIs, listing DirectX, OpenGL, and Vulkan as N/A. Its 19,456 shading units and 1,216 texture mapping units feed a texture rate of 2,553.6 GTexel/s, with FP32 and FP16 compute both rated at 81.72 TFLOPS in a 1:1 ratio.

The Radeon 8065S is built on RDNA 3.5, AMD's graphics-oriented architecture for mobile parts. Its chip, codenamed Gorgon Halo, uses a 4 nm process from TSMC and occupies a 308 mm² die. The transistor count is listed as unknown. The architecture includes 2,560 shading units, 160 texture mapping units, 64 ROPs, and 40 ray tracing cores. Pixel rate reaches 192.0 GPixel/s and texture rate reaches 480.0 GTexel/s. FP32 and FP16 compute are both rated at 15.36 TFLOPS in a 1:1 ratio. The RDNA 3.5 architecture supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, making it a full-featured graphics solution.

The two chips represent divergent design philosophies. CDNA 3.0 strips out graphics capabilities entirely to maximize compute and memory throughput. RDNA 3.5 retains full graphics functionality including ray tracing, while operating within a mobile power envelope. The MI325X has no display outputs and no power connectors, relying on the OAM Module form factor for power delivery. The Radeon 8065S is an IGP with display outputs described as portable device dependent, meaning the host laptop or handheld determines the actual display connections.

Specification Differences

The MI325X and Radeon 8065S differ across nearly every measurable specification. The MI325X uses a 5 nm process node, while the Radeon 8065S uses a 4 nm node, both from TSMC. Die size differs substantially: 1017 mm² for the MI325X versus 308 mm² for the Radeon 8065S. Transistor count is 153,000 million for the MI325X and unknown for the Radeon 8065S.

Clock speeds diverge significantly. The MI325X has a base clock of 1000 MHz and a boost clock of 2100 MHz. The Radeon 8065S has a base clock of 1295 MHz and a boost clock of 3000 MHz, meaning the mobile part runs at a higher clock frequency despite its much lower power budget.

Memory configurations are completely different. The MI325X features 256 GB of HBM3e on an 8192-bit bus with 6.14 TB/s bandwidth and a memory clock of 1500 MHz (6 Gbps effective). The Radeon 8065S uses system shared memory, with size, type, bus width, and bandwidth all marked as system dependent or system shared.

Compute resources show the MI325X's scale advantage: 19,456 shading units versus 2,560, 1,216 TMUs versus 160, and 0 ROPs versus 64. The Radeon 8065S includes 40 ray tracing cores, while the MI325X lists no RT cores. Pixel rate is 0 MPixel/s for the MI325X and 192.0 GPixel/s for the Radeon 8065S. Texture rate is 2,553.6 GTexel/s for the MI325X and 480.0 GTexel/s for the Radeon 8065S.

Power and form factor differ dramatically. The MI325X has a TDP of 1000 W, a suggested PSU of 1400 W, and an OAM Module slot width. The Radeon 8065S has a TDP of 55 W, no suggested PSU, and an IGP slot width. Both use PCIe 5.0 x16 as the bus interface and have no power connectors listed.

API support is mutually exclusive. The MI325X lists DirectX, OpenGL, and Vulkan as N/A. The Radeon 8065S supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Release dates differ by more than a year. The MI325X launched on October 9, 2024. The Radeon 8065S is dated December 31, 2025. The MI325X's predecessor is Radeon Instinct, while the Radeon 8065S's predecessor is Polaris Mobile. The Radeon 8065S has an active production status, while the MI325X's production status is not listed.

Head-to-Head Benchmarks

The database contains no recorded benchmark scores for either GPU. Both parts have an average benchmark score of 0 and a percentile rank of 50 against all GPUs. No nearest rivals are listed for either part, and the head-to-head benchmark array is empty. Wins are recorded as 0 for both sides.

The absence of benchmark data is itself informative. The MI325X is a data center accelerator with no graphics APIs and no display outputs, making standard GPU benchmark suites inapplicable. The Radeon 8065S is a mobile IGP that had not shipped at the time of data collection, with a release date of December 31, 2025. Neither part has accumulated public benchmark results in the database.

What can be compared directly are the specification-derived performance indicators. The MI325X's FP32 compute of 81.72 TFLOPS is 5.32 times the Radeon 8065S's 15.36 TFLOPS. Texture rate favors the MI325X at 2,553.6 GTexel/s versus 480.0 GTexel/s, a 5.32 times advantage consistent with the compute ratio. Memory bandwidth cannot be compared numerically because the Radeon 8065S's bandwidth is system dependent, but the MI325X's 6.14 TB/s represents a fixed, massive throughput figure.

The Radeon 8065S counters in areas the MI325X does not address. Pixel rate of 192.0 GPixel/s compares to 0 MPixel/s for the MI325X. Ray tracing cores number 40 for the Radeon 8065S versus none for the MI325X. The Radeon 8065S also operates at higher clocks: 3000 MHz boost versus 2100 MHz for the MI325X, and 1295 MHz base versus 1000 MHz.

Power efficiency favors the Radeon 8065S overwhelmingly based on the recorded TDP figures. The MI325X consumes 1000 W to deliver 81.72 TFLOPS, while the Radeon 8065S consumes 55 W to deliver 15.36 TFLOPS. Per watt, the Radeon 8065S delivers approximately 0.279 TFLOPS per watt versus approximately 0.082 TFLOPS per watt for the MI325X, a calculation derived directly from the recorded numbers.

Where Each One Wins

The MI325X wins decisively in compute throughput and memory capacity. Its 81.72 TFLOPS FP32 and FP16 performance, 256 GB of HBM3e memory, and 6.14 TB/s bandwidth position it for large-scale data center workloads such as model training, scientific simulation, and high-performance computing. The 8192-bit memory bus is the widest recorded in the data, and the 1017 mm² die with 153,000 million transistors indicates a part built without cost constraints for maximum capability. Its CDNA 3.0 architecture dispenses with graphics features entirely, confirming a singular focus on compute acceleration.

The Radeon 8065S wins in graphics capability, power efficiency, and portability. Its RDNA 3.5 architecture includes 40 ray tracing cores, 64 ROPs, and support for DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Pixel rate of 192.0 GPixel/s and a 3000 MHz boost clock make it appropriate for gaming and graphical workloads in portable devices. At 55 W TDP, it operates in a power class the MI325X cannot approach; the 1000 W TDP of the MI325X requires a 1400 W suggested PSU and an OAM Module form factor. The Radeon 8065S uses system shared memory, which ties its bandwidth to the host platform, but this design choice enables the IGP form factor and eliminates the need for dedicated VRAM.

The MI325X is the winner for server racks, accelerator pods, and compute clusters where power and space are available and memory bandwidth is paramount. The Radeon 8065S is the winner for laptops, handhelds, and embedded systems where graphics output, modern API support, and low power draw are required. The MI325X produces no display output and cannot run graphics APIs, so it holds no utility in client systems. The Radeon 8065S cannot match the MI325X's compute or memory capacity, so it holds no utility in data center acceleration.

The production status further separates the two. The Radeon 8065S is listed as active production with a release date of December 31, 2025. The MI325X's production status is not listed, though its October 9, 2024 release date indicates it has been available for over a year. The predecessor relationships also differ: the MI325X follows Radeon Instinct, while the Radeon 8065S follows Polaris Mobile, confirming their distinct product lineages within AMD's portfolio.