AMD Instinct MI325X vs Intel Arc Pro B65 Comparison

Where Each One Wins

The recorded data for these two accelerators shows no direct head-to-head benchmark results, so the comparison rests entirely on their architectural specifications and the roles those specifications define. The AMD Instinct MI325X is built for a single purpose: massive parallel computation with enormous memory capacity. It has no display outputs, no consumer graphics API support, and a power envelope that places it firmly in datacenter territory. The Intel Arc Pro B65, by contrast, is a professional workstation GPU with four DisplayPort 2.1 outputs, full DirectX 12 Ultimate support, and a power draw suited to a standard desktop workstation.

In raw compute throughput, the AMD part dominates. The MI325X delivers 81.72 TFLOPS of FP32 performance, which is roughly 6.6 times the Arc Pro B65's 12.29 TFLOPS. For FP16 workloads, the gap narrows somewhat because Intel uses a 2:1 ratio, giving 24.58 TFLOPS, while AMD provides FP16 at a 1:1 ratio, meaning the same 81.72 TFLOPS. This makes the MI325X the clear choice for dense matrix operations, large-scale inference, and scientific simulation where FP32 or FP16 precision dominates.

Memory capacity is another decisive differentiator. The MI325X carries 256 GB of HBM3e across an 8192-bit bus, yielding 6.14 TB/s of bandwidth. The Arc Pro B65 offers 32 GB of GDDR6 on a 256-bit bus, delivering 608.0 GB/s. That is a 10x bandwidth advantage for AMD and an 8x capacity advantage. For datasets that exceed 32 GB, or for models that require constant high-bandwidth access to large matrices, the MI325X is the only one of the two that can operate without spilling to system memory.

The Arc Pro B65 wins in areas the MI325X simply does not address. It has 20 ray tracing cores, a pixel rate of 192.0 GPixel/s, and a texture rate of 384.0 GTexel/s. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. It fits in a dual-slot form factor with a single 8-pin power connector and a suggested PSU of 550 W. The MI325X has a pixel rate of 0 MPixel/s, no ray tracing cores listed, no graphics API support, and no display outputs. It is not a graphics card in any conventional sense; it is a compute accelerator with an OAM module form factor.

Architecture Differences

The two chips come from different architectural lineages. The MI325X uses CDNA 3.0, AMD's dedicated compute architecture, built on the Aqua Vanjaram chip. The process node is 5 nm at TSMC, with 153,000 million transistors on a 1017 mm² die. That translates to a transistor density of 150.4 million per mm². The Arc Pro B65 uses Intel's Xe2-HPG architecture, the Battlemage generation, on the BMG-G21 chip. It is also 5 nm from TSMC, but packs 19,600 million transistors on a 272 mm² die, for a density of 72.1 million per mm². Both use the same foundry and node, but AMD devotes far more silicon area and transistor budget to raw compute throughput.

Compute resources differ sharply. The MI325X has 19,456 shading units and 1,216 texture mapping units. The Arc Pro B65 has 2,560 shading units and 160 TMUs. The Arc Pro B65 has 80 ROPs; the MI325X lists zero ROPs, consistent with its lack of rasterization hardware. The MI325X also lists no ray tracing cores, while the Arc Pro B65 includes 20. Clock behavior also differs: the MI325X runs at a 1000 MHz base and 2100 MHz boost, whereas the Arc Pro B65 runs at a flat 2400 MHz for both base and boost. Intel compensates for fewer cores with a higher sustained clock.

Memory architecture could hardly be more different. AMD uses HBM3e at 1500 MHz with 6 Gbps effective speed, across an 8192-bit bus. Intel uses GDDR6 at 2375 MHz with 19 Gbps effective speed, across a 256-bit bus. The bandwidth difference is enormous in AMD's favor, but the Intel part uses conventional GDDR6, which is far simpler to integrate on a dual-slot card. The MI325X is an OAM module, meaning it requires a server platform designed for that form factor, with no power connectors because power delivery is handled through the module interface. The Arc Pro B65 uses a standard 1x 8-pin connector.

Power requirements reflect the performance gap. The MI325X has a TDP of 1000 W and suggests a 1400 W PSU. The Arc Pro B65 has a 200 W TDP and a 550 W suggested PSU. The AMD part is a five-fold increase in power draw, which is the price of 6.6x FP32 throughput and 10x memory bandwidth.

The Verdict

The data defines two separate products with almost no overlap in intended use. The AMD Instinct MI325X is for compute-heavy environments where memory capacity, bandwidth, and FP32 throughput are the limiting factors. It has no display outputs, no graphics API support, and no rasterization hardware. It cannot render a desktop, run a game, or drive a monitor. Its role is datacenter acceleration, large model inference, and scientific workloads where a 256 GB HBM3e pool is a requirement.

The Intel Arc Pro B65 is a professional workstation GPU. It provides 32 GB of GDDR6, four DisplayPort 2.1 outputs, full graphics API support, and ray tracing hardware. It fits in a standard dual-slot card with a single 8-pin power connector. Its FP32 throughput of 12.29 TFLOPS is far below the MI325X, but it can actually display results, run graphics workloads, and be installed in a conventional workstation.

Neither part is a substitute for the other. A machine learning engineer with datasets exceeding 32 GB needs the MI325X. A workstation user who needs GPU-accelerated rendering, video output, and professional graphics API support needs the Arc Pro B65. The MI325X's 50th percentile standing among all GPUs in the database reflects its narrow specialization; the Arc Pro B65 shares that same percentile, but for entirely different reasons. The choice is dictated by workload, not by any notion of one being objectively better.

FAQ

Q: Which has higher FP32 performance?

A: The AMD Instinct MI325X delivers 81.72 TFLOPS, which is 6.6 times the 12.29 TFLOPS of the Intel Arc Pro B65.

Q: How much memory does each card have?

A: The MI325X has 256 GB of HBM3e. The Arc Pro B65 has 32 GB of GDDR6.

Q: Can the AMD Instinct MI325X output video?

A: No. It lists no display outputs and has a pixel rate of 0 MPixel/s. The Arc Pro B65 has four DisplayPort 2.1 outputs.

Q: What is the power draw difference?

A: The MI325X has a 1000 W TDP and recommends a 1400 W PSU. The Arc Pro B65 has a 200 W TDP and recommends a 550 W PSU.

Q: Do both support the same graphics APIs?

A: No. The MI325X lists N/A for DirectX, OpenGL, and Vulkan. The Arc Pro B65 supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Q: Which GPU has ray tracing cores?

A: Only the Intel Arc Pro B65, which has 20 ray tracing cores. The MI325X lists no ray tracing cores.

Head-to-Head Benchmarks

The database records no direct benchmark comparisons between these two parts, so the largest wins must be quantified from specification data. The most decisive advantage for the AMD MI325X is memory bandwidth. At 6.14 TB/s, it is roughly 10.1 times the 608.0 GB/s of the Arc Pro B65. For memory-bound workloads such as large language model inference or sparse matrix multiplication, this is the dominant factor. The MI325X also holds an 8x capacity advantage with 256 GB versus 32 GB, which determines whether an entire dataset can reside on the accelerator.

FP32 throughput is the second major win for AMD. The MI325X's 81.72 TFLOPS is 6.6 times the Arc Pro B65's 12.29 TFLOPS. In FP16, the MI325X maintains 81.72 TFLOPS on a 1:1 ratio, while the Arc Pro B65 reaches 24.58 TFLOPS on a 2:1 ratio, still a 3.3x gap in AMD's favor. Texture rate follows a similar pattern: 2,553.6 GTexel/s for AMD versus 384.0 GTexel/s for Intel, a 6.7x difference.

The Intel Arc Pro B65 wins in areas related to graphics and integration. Its pixel rate of 192.0 GPixel/s compares to 0 MPixel/s for the MI325X, a complete shutout for rasterization. The Arc Pro B65 also has 20 ray tracing cores where the MI325X has none. Clock speed favors Intel as well: 2400 MHz base and boost, compared to 1000 MHz base and 2100 MHz boost for AMD. The higher base clock means the Intel part sustains its full frequency without boost variability. Power efficiency, measured as performance per watt, also favors Intel: the Arc Pro B65 delivers its 12.29 TFLOPS at 200 W, while the MI325X delivers 81.72 TFLOPS at 1000 W, which is roughly 61.5 GFLOPS/W for Intel versus 81.7 GFLOPS/W for AMD, a modest efficiency edge for the larger chip.

Form factor is a practical win for Intel. The Arc Pro B65 is a dual-slot card with a standard 1x 8-pin power connector. The MI325X is an OAM module with no power connectors, requiring a server chassis with the appropriate power delivery via the module interface. For any user outside a datacenter, the Intel part is the only one that installs into a conventional system.

Specification Differences

The following fields differ between the two parts:

• Architecture: CDNA 3.0 (AMD) versus Xe2-HPG (Intel)
• Chip: Aqua Vanjaram versus BMG-G21
• Generation: Instinct (MIx) versus Battlemage (Pro Series)
• Transistors: 153,000 million versus 19,600 million
• Die size: 1017 mm² versus 272 mm²
• Transistor density: 150.4M / mm² versus 72.1M / mm²
• Base clock: 1000 MHz versus 2400 MHz
• Boost clock: 2100 MHz versus 2400 MHz
• Memory clock: 1500 MHz 6 Gbps effective versus 2375 MHz 19 Gbps effective
• Memory size: 256 GB versus 32 GB
• Memory type: HBM3e versus GDDR6
• Memory bus: 8192 bit versus 256 bit
• Memory bandwidth: 6.14 TB/s versus 608.0 GB/s
• Shading units: 19456 versus 2560
• TMUs: 1216 versus 160
• ROPs: 0 versus 80
• Ray tracing cores: None versus 20
• Pixel rate: 0 MPixel/s versus 192.0 GPixel/s
• Texture rate: 2,553.6 GTexel/s versus 384.0 GTexel/s
• FP32: 81.72 TFLOPS versus 12.29 TFLOPS
• FP16: 81.72 TFLOPS (1:1) versus 24.58 TFLOPS (2:1)
• TDP: 1000 W versus 200 W
• Slot width: OAM Module versus Dual-slot
• Power connectors: None versus 1x 8-pin
• Suggested PSU: 1400 W versus 550 W
• Display outputs: No outputs versus 4x DisplayPort 2.1
• DirectX support: N/A versus 12 Ultimate (12_2)
• OpenGL support: N/A versus 4.6
• Vulkan support: N/A versus 1.4
• Production status: Not listed versus Active
• Release date: 2024-10-09 versus 2026-03-31