AMD Instinct MI350X vs NVIDIA RTX PRO 4500 Blackwell Server Comparison

Where Each One Wins

The AMD Instinct MI350X and NVIDIA RTX PRO 4500 Blackwell Server target fundamentally different workloads, and the recorded data makes that split explicit. The MI350X is built around the MI350 256CU chip on a 3 nm process, delivering 72.09 TFLOPS FP32 and 72.09 TFLOPS FP16 at a 1:1 ratio. That symmetry matters: compute-heavy tasks that rely on either precision format can run at full throughput without penalty. The NVIDIA card, using the GB203 chip on a 5 nm process, delivers 50.70 TFLOPS FP32 and 50.70 TFLOPS FP16, also at a 1:1 ratio. The MI350X leads by roughly 42% in raw FP32 and FP16 throughput, a margin that shows up in any workload that scales with shader or tensor math.

Memory capacity and bandwidth further separate the two. The MI350X carries 288 GB of HBM3e across an 8192 bit bus, producing 8.19 TB/s of bandwidth. The RTX PRO 4500 uses 32 GB of GDDR7 on a 256 bit bus, yielding 800.3 GB/s. That is a 10x difference in bandwidth and a 9x difference in capacity. For large model inference, training datasets, or in-memory databases, the MI350X has a structural advantage that clock speed cannot offset. The NVIDIA part, meanwhile, offers 112 ROPs and a pixel rate of 270.5 GPixel/s, while the MI350X lists 0 ROPs and 0 MPixel/s pixel rate. The MI350X has no display outputs and no graphics API support (DirectX, OpenGL, Vulkan all listed as N/A). The RTX PRO 4500 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, making it the only one of the two that can handle graphics or rasterization pipelines.

Thermal and physical design tells the same story. The MI350X is an OAM Module with a 1000 W TDP and a suggested PSU of 1400 W, while the RTX PRO 4500 is a single-slot card with a 165 W TDP and a 450 W suggested PSU. The MI350X measures 102 mm by 165 mm, while the RTX PRO 4500 is 267 mm by 111 mm by 40 mm. The NVIDIA part fits in standard server chassis and draws a fraction of the power. The AMD part requires specialized OAM carrier boards and substantial power delivery. These are not competing products in the usual sense; they are answers to different questions.

The Verdict

The data indicates that each card wins in its intended domain. The AMD Instinct MI350X is the choice for memory-bound and compute-bound acceleration where capacity and bandwidth dominate. Its 288 GB HBM3e pool and 8.19 TB/s bandwidth allow it to hold models or datasets that would never fit in the RTX PRO 4500's 32 GB GDDR7. The 72.09 TFLOPS FP32 and FP16 figures are simply higher than the NVIDIA card's 50.70 TFLOPS, so any workload that saturates math units will finish faster on the MI350X. The 1000 W TDP and OAM form factor are acceptable trade-offs in a server room designed for dense compute.

The NVIDIA RTX PRO 4500 Blackwell Server is the choice for systems that need graphics API support, rasterization, or a conventional PCIe card footprint. It has 112 ROPs, 270.5 GPixel/s pixel throughput, and 82 RT cores, none of which the MI350X offers. It also draws 165 W, uses a single slot, and connects via a single 16-pin power connector. The 32 GB GDDR7 at 800.3 GB/s is modest compared to the MI350X, but it is sufficient for many inference and rendering workloads that do not require massive memory residency. The production status is Active for the NVIDIA card, while the MI350X lists no production status, and the release dates differ: the MI350X launched on 2025-06-11, the RTX PRO 4500 on 2026-03-16.

Neither card is a substitute for the other. The MI350X wins on raw compute, memory capacity, and bandwidth. The RTX PRO 4500 wins on power efficiency, graphics features, and physical compatibility. The 50th percentile ranking against all GPUs for both cards is identical, but that percentile reflects an empty benchmark database for both, not comparable performance. The recorded data shows two specialized accelerators, not two versions of the same product.

Head-to-Head Benchmarks

The head-to-head benchmark list is empty, and both cards have zero recorded benchmark scores. The wins counter is 0 for each side. That means the comparison must rely on architectural and specification differences rather than measured performance deltas. The most significant gap is memory bandwidth: 8.19 TB/s for the MI350X versus 800.3 GB/s for the RTX PRO 4500, a 10.2x difference. Any workload that streams data from memory will see the MI350X pull far ahead, assuming the software can utilize the HBM3e stack. The 8192 bit bus versus 256 bit bus explains the bulk of that gap, though the MI350X also uses a faster memory type.

Compute throughput follows a similar pattern. The MI350X delivers 72.09 TFLOPS FP32 and FP16, compared to 50.70 TFLOPS for the RTX PRO 4500. The MI350X leads by 42.4% in both formats. Texture rate also favors the AMD card: 2,252.8 GTexel/s versus 792.1 GTexel/s, a 2.84x margin. The MI350X has 16,384 shading units and 1,024 TMUs, versus 10,496 shading units and 328 TMUs for the NVIDIA card. That is 56% more shading units and 3.12x more TMUs. The NVIDIA card counters with 112 ROPs and 270.5 GPixel/s, while the MI350X has zero ROPs and zero pixel rate, so any pixel-heavy workload belongs to the RTX PRO 4500 by default.

Clock speeds are close at the boost level: 2200 MHz for the MI350X versus 2415 MHz for the RTX PRO 4500. The NVIDIA chip runs 9.8% higher boost clock, but the AMD card compensates with more than 1.5x the shader count. Base clocks are 1000 MHz versus 1215 MHz, a 21.5% difference in the NVIDIA card's favor. The memory clocks are not directly comparable given different memory types: 2000 MHz with 8 Gbps effective for HBM3e, versus 1563 MHz with 25 Gbps effective for GDDR7. The effective data rate is 3.13x higher on the NVIDIA card, but the bus width difference overwhelms that advantage.

Transistor counts and die sizes show two very different design philosophies. The MI350X packs 185,000 million transistors on a 2380 mm² die with a 77.7M / mm² density. The RTX PRO 4500 uses 45,600 million transistors on 378 mm² with a 120.6M / mm² density. The MI350X die is 6.3x larger and holds 4.06x more transistors, but the NVIDIA chip achieves 1.55x higher transistor density. The MI350X uses a 3 nm process, the RTX PRO 4500 uses 5 nm, both from TSMC. The larger die and higher transistor count explain the MI350X's 1000 W TDP versus 165 W for the NVIDIA card.

FAQ

Q: Which card has higher FP32 compute?

A: The AMD Instinct MI350X delivers 72.09 TFLOPS FP32, compared to 50.70 TFLOPS for the NVIDIA RTX PRO 4500, a 42.4% advantage.

Q: Can either card render graphics?

A: Only the RTX PRO 4500 supports graphics APIs: DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI350X lists N/A for all three APIs and has no display outputs.

Q: How do memory capacities compare?

A: The MI350X has 288 GB of HBM3e, while the RTX PRO 4500 has 32 GB of GDDR7. The MI350X also has a much wider 8192 bit bus versus 256 bit, yielding 8.19 TB/s versus 800.3 GB/s bandwidth.

Q: What is the power draw difference?

A: The MI350X has a 1000 W TDP with a 1400 W suggested PSU, while the RTX PRO 4500 has a 165 W TDP with a 450 W suggested PSU.

Q: Do both cards have ray tracing cores?

A: The RTX PRO 4500 has 82 RT cores. The MI350X lists no RT core count, and its architecture is CDNA 4.0, which does not include graphics-focused hardware.

Q: What are the physical form factors?

A: The MI350X is an OAM Module measuring 102 mm by 165 mm with no power connectors listed. The RTX PRO 4500 is a single-slot PCIe card measuring 267 mm by 111 mm by 40 mm with a 1x 16-pin power connector.

Architecture Differences

The two cards use entirely different architectures from different vendors, and the data shows no overlap in design goals. The MI350X uses CDNA 4.0, a compute-oriented architecture from AMD, while the RTX PRO 4500 uses Blackwell 2.0 from NVIDIA. The MI350X chip is labeled "MI350 256CU," suggesting 256 compute units, while the RTX PRO 4500 uses the GB203 chip. The MI350X has 16,384 shading units and 1,024 TMUs but zero ROPs, confirming it has no rasterization pipeline. The RTX PRO 4500 has 10,496 shading units, 328 TMUs, 112 ROPs, and 82 RT cores, making it a full-featured graphics processor that also handles compute.

The MI350X supports no graphics APIs, while the RTX PRO 4500 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI350X has no display outputs, and the RTX PRO 4500 also lists no display outputs, so neither card is meant for direct video connection. The MI350X uses HBM3e memory, which is stacked and high-bandwidth, while the RTX PRO 4500 uses GDDR7, a conventional discrete memory type. The memory bus widths reflect that: 8192 bit for HBM3e versus 256 bit for GDDR7.

The process nodes differ: 3 nm for the MI350X versus 5 nm for the RTX PRO 4500, both fabricated by TSMC. Transistor density is higher on the NVIDIA chip at 120.6M / mm² versus 77.7M / mm², despite the AMD chip having a more advanced process node. The MI350X transistor count of 185,000 million dwarfs the RTX PRO 4500's 45,600 million, and the die size of 2380 mm² versus 378 mm² shows the MI350X is a massive chip by any standard. The RTX PRO 4500 has a production status of Active, while the MI350X lists no production status. The MI350X predecessor is Radeon Instinct, and the RTX PRO 4500 predecessor is Server Hopper, with a successor of Server Rubin listed for the NVIDIA card.

Specification Differences

The MI350X and RTX PRO 4500 differ on nearly every specification field. The MI350X has a base clock of 1000 MHz and boost of 2200 MHz, while the RTX PRO 4500 runs at 1215 MHz base and 2415 MHz boost. The MI350X memory clock is 2000 MHz with 8 Gbps effective, while the RTX PRO 4500 memory clock is 1563 MHz with 25 Gbps effective. Memory size is 288 GB versus 32 GB, type is HBM3e versus GDDR7, bus width is 8192 bit versus 256 bit, and bandwidth is 8.19 TB/s versus 800.3 GB/s.

Shading units are 16,384 versus 10,496, TMUs are 1,024 versus 328, and ROPs are 0 versus 112. The RTX PRO 4500 has 82 RT cores and 328 tensor cores, while the MI350X lists no RT or tensor core counts. Pixel rate is 0 MPixel/s versus 270.5 GPixel/s, texture rate is 2,252.8 GTexel/s versus 792.1 GTexel/s. FP32 is 72.09 TFLOPS versus 50.70 TFLOPS, and FP16 is 72.09 TFLOPS versus 50.70 TFLOPS, both at 1:1 ratios.

TDP is 1000 W versus 165 W. Slot width is OAM Module versus single-slot. Power connectors are none versus 1x 16-pin. Suggested PSU is 1400 W versus 450 W. Bus interface is PCIe 5.0 x16 for both. Display outputs are none for both. Dimensions are 102 mm by 165 mm for the MI350X, versus 267 mm by 111 mm by 40 mm for the RTX PRO 4500. The MI350X release date is 2025-06-11, and the RTX PRO 4500 release date is 2026-03-16. The MI350X has no launch MSRP listed, and the RTX PRO 4500 also has no launch MSRP listed.