AMD Radeon RX 7800 XT vs NVIDIA Rubin GPU Comparison

FAQ

Q: What is the core architectural difference between the AMD Radeon RX 7800 XT and the NVIDIA Rubin GPU?

A: The RX 7800 XT uses AMD's RDNA 3.0 architecture on a 5 nm TSMC process, while the Rubin GPU uses NVIDIA's Rubin architecture on a 3 nm TSMC process. The RX 7800 XT is a client gaming card with 60 RT cores, whereas the Rubin is a server compute module with 896 tensor cores.

Q: How do the memory subsystems compare?

A: The RX 7800 XT has 16 GB of GDDR6 on a 256-bit bus with 624.1 GB/s bandwidth. The Rubin GPU has 288 GB of HBM4 on a 16384-bit bus with 22.1 TB/s bandwidth, which is roughly 35 times the memory capacity and over 35 times the bandwidth.

Q: What is the transistor count difference?

A: The RX 7800 XT contains 28,100 million transistors on a 346 mm² die, giving a density of 81.2M transistors per mm². The Rubin GPU contains 336,000 million transistors on a 1456 mm² die, with a density of 230.8M per mm².

Q: Which GPU has higher FP32 compute?

A: The Rubin GPU delivers 130.0 TFLOPS FP32, which is about 3.5 times the 37.32 TFLOPS of the RX 7800 XT. The Rubin also offers 260.0 TFLOPS FP16 (2:1 ratio), while the RX 7800 XT provides 37.32 TFLOPS FP16 (1:1 ratio).

Q: What are the power requirements?

A: The RX 7800 XT has a TDP of 263 W with a suggested PSU of 600 W and uses 2x 8-pin connectors. The Rubin GPU has a TDP of 2300 W with a suggested PSU of 2700 W, and uses an SXM module form factor.

Q: Do both GPUs support the same APIs?

A: No. The RX 7800 XT supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The Rubin GPU has N/A for DirectX, OpenGL, and Vulkan, indicating it is not designed for client graphics APIs.

Architecture Differences

The AMD Radeon RX 7800 XT and NVIDIA Rubin GPU occupy entirely different segments of the hardware landscape. The RX 7800 XT is built on the Navi 32 chip with RDNA 3.0 architecture, part of the Navi III (RX 7000) generation. It uses a 5 nm TSMC process with 28,100 million transistors on a 346 mm² die. The Rubin GPU uses the GR100 chip with NVIDIA's Rubin architecture, part of the Server Rubin (Rxx) generation, fabricated on a 3 nm TSMC process with 336,000 million transistors across a 1456 mm² die. This makes the Rubin roughly 12 times larger in transistor count and about 4.2 times larger in die area.

The compute resources differ substantially. The RX 7800 XT has 3840 shading units, 240 TMUs, and 96 ROPs, with 60 dedicated RT cores. The Rubin GPU has 28,720 shading units, 896 TMUs, and only 24 ROPs, but adds 896 tensor cores. The low ROP count on the Rubin reflects its server-oriented design, where rasterization throughput (54.41 GPixel/s versus 233.3 GPixel/s on the RX 7800 XT) is not the priority. The RX 7800 XT achieves a texture rate of 583.2 GTexel/s, while the Rubin reaches 2,031.2 GTexel/s.

Memory architecture is where the two diverge most sharply. The RX 7800 XT uses 16 GB of GDDR6 on a 256-bit bus, delivering 624.1 GB/s. The Rubin uses 288 GB of HBM4 on a 16384-bit bus, delivering 22.1 TB/s. Clock behavior also differs: the RX 7800 XT has a base clock of 1295 MHz and a boost of 2430 MHz with a game clock of 2124 MHz. The Rubin has a much lower base of 700 MHz but boosts to 2267 MHz, closer to the RX 7800 XT's boost.

The RX 7800 XT is a dual-slot card with 2x 8-pin power connectors, a 267 mm length, and display outputs including 1x HDMI 2.1a and 3x DisplayPort 2.1. The Rubin is an SXM module with no display outputs, no dimensions recorded, and no power connector field. The RX 7800 XT uses PCIe 4.0 x16, while the Rubin uses PCIe 6.0 x16. The RX 7800 XT supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4; the Rubin lists N/A for all three client APIs.

Head-to-Head Benchmarks

The database contains benchmark results for the RX 7800 XT, while the Rubin GPU has no recorded benchmark scores. The head-to-head comparison list is empty, so the analysis relies on the available performance data for the RX 7800 XT and the raw specifications of the Rubin.

The RX 7800 XT posts a 3DMark Steel Nomad DX12 score of 4157. In Geekbench, it scores 18,290 in OpenCL and 54,228 in Vulkan. Passmark results include 24,176 in G3D, 13,473 in GPU Compute, 1177 in G2D, and legacy DirectX scores of 304 (DX9), 249 (DX11), 121 (DX10), and 93 (DX12). Its average benchmark score is 11,627, placing it at the 51st percentile among all GPUs.

The RX 7800 XT's nearest rivals in the database show a tight cluster. The NVIDIA GeForce GTX 1660 has an average score of 11,680 (0.5% ahead), the AMD Radeon Pro 5500M scores 11,528 (0.9% behind), the NVIDIA Tesla K20c scores 11,479 (1.3% behind), and the AMD Radeon RX 6500 XT scores 11,842 (1.8% ahead). This places the RX 7800 XT in a competitive mid-range band, where small percentage differences separate the cards.

For the Rubin GPU, the lack of benchmark data means no direct score comparisons are possible. The specification sheet, however, indicates a different performance class entirely. With 130.0 TFLOPS FP32 and 260.0 TFLOPS FP16, the Rubin's compute capacity exceeds the RX 7800 XT by 3.5 times in FP32 and 7 times in FP16. The texture rate is 3.5 times higher, and the memory bandwidth is 35.4 times higher. The RX 7800 XT does maintain an advantage in pixel rate (233.3 versus 54.41 GPixel/s), which reflects its rasterization focus.

The Verdict

The data supports a clear segmentation. The AMD Radeon RX 7800 XT is a client graphics card designed for DirectX 12 Ultimate workloads, with a dual-slot footprint, display outputs, and a 263 W TDP. Its benchmark scores, while modest in absolute terms, place it at the 51st percentile, with nearest rivals within a 2% band. The Rubin GPU is a server compute module with no display outputs, no client API support, a 2300 W TDP, and a 2700 W suggested PSU. Its raw compute and memory resources target data center workloads, not desktop gaming.

For a builder assembling a gaming or workstation PC, the RX 7800 XT is the only viable choice between the two, given its API support and conventional form factor. For a server deployment requiring massive memory bandwidth (22.1 TB/s), tensor core compute, and 288 GB of HBM4, the Rubin GPU is the intended selection. The two do not compete in the same market segment.

The RX 7800 XT also offers an active production status with a release date of September 5, 2023, and a launch MSRP of 499 USD. The Rubin GPU has an active production status with a release date of December 31, 2025, and no recorded MSRP.

Specification Differences

| Specification | AMD Radeon RX 7800 XT | NVIDIA Rubin GPU |

| --- | --- | --- |

| Architecture | RDNA 3.0 | Rubin |

| Process Node | 5 nm | 3 nm |

| Transistors | 28,100 million | 336,000 million |

| Die Size | 346 mm² | 1456 mm² |

| Transistor Density | 81.2M / mm² | 230.8M / mm² |

| Base Clock | 1295 MHz | 700 MHz |

| Boost Clock | 2430 MHz | 2267 MHz |

| Game Clock | 2124 MHz | N/A |

| Memory Size | 16 GB | 288 GB |

| Memory Type | GDDR6 | HBM4 |

| Memory Bus Width | 256 bit | 16384 bit |

| Memory Bandwidth | 624.1 GB/s | 22.1 TB/s |

| Shading Units | 3840 | 28,720 |

| TMUs | 240 | 896 |

| ROPs | 96 | 24 |

| RT Cores | 60 | N/A |

| Tensor Cores | N/A | 896 |

| Pixel Rate | 233.3 GPixel/s | 54.41 GPixel/s |

| Texture Rate | 583.2 GTexel/s | 2,031.2 GTexel/s |

| FP32 | 37.32 TFLOPS | 130.0 TFLOPS |

| FP16 | 37.32 TFLOPS (1:1) | 260.0 TFLOPS (2:1) |

| TDP | 263 W | 2300 W |

| Slot Width | Dual-slot | SXM Module |

| Power Connectors | 2x 8-pin | N/A |

| Suggested PSU | 600 W | 2700 W |

| Bus Interface | PCIe 4.0 x16 | PCIe 6.0 x16 |

| Display Outputs | 1x HDMI 2.1a, 3x DisplayPort 2.1 | No outputs |

| DirectX | 12 Ultimate (12_2) | N/A |

| OpenGL | 4.6 | N/A |

| Vulkan | 1.4 | N/A |

| Release Date | 2023-09-05 | 2025-12-31 |

| Predecessor | Navi II | Server Blackwell |

| Successor | Navi IV | N/A |

| Launch MSRP | 499 USD | N/A |

Where Each One Wins

The AMD Radeon RX 7800 XT wins in client-side rendering workloads. Its pixel rate of 233.3 GPixel/s is 4.3 times higher than the Rubin's 54.41 GPixel/s, making it the stronger choice for rasterized graphics output. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, which the Rubin lacks entirely. The RX 7800 XT also has display outputs (1x HDMI 2.1a, 3x DisplayPort 2.1), a dual-slot form factor, and a 263 W TDP that fits standard desktop power envelopes. Its 16 GB of GDDR6 memory and 624.1 GB/s bandwidth serve typical gaming and workstation resolutions. The RX 7800 XT holds the 51st percentile ranking with benchmark scores across 3DMark, Geekbench, and Passmark suites, confirming it as a functional, measurable product in the database.

The NVIDIA Rubin GPU wins in compute-dense server workloads. Its FP32 throughput of 130.0 TFLOPS is 3.5 times the RX 7800 XT's 37.32 TFLOPS, and its FP16 throughput of 260.0 TFLOPS is 7 times higher. The 22.1 TB/s memory bandwidth is 35.4 times the RX 7800 XT's 624.1 GB/s, and the 288 GB HBM4 capacity dwarfs the 16 GB GDDR6 pool. The 896 tensor cores provide dedicated AI acceleration hardware that the RX 7800 XT lacks. The texture rate of 2,031.2 GTexel/s is 3.5 times higher. The Rubin's 3 nm process with 230.8M transistors per mm² shows a density advantage of 2.8 times over the RX 7800 XT's 81.2M per mm². The PCIe 6.0 x16 interface doubles the bandwidth potential of the RX 7800 XT's PCIe 4.0 x16. The SXM module form factor and 2300 W TDP indicate a data center installation profile, with the suggested 2700 W PSU reinforcing that positioning.

The RX 7800 XT also wins on power efficiency relative to its role: 37.32 TFLOPS at 263 W versus 130.0 TFLOPS at 2300 W. On a per-watt basis, the RX 7800 XT delivers 0.142 TFLOPS per watt, while the Rubin delivers 0.057 TFLOPS per watt. The Rubin's absolute performance is far higher, but its power draw scales disproportionately. For workloads that fit within 16 GB of memory and do not require tensor cores, the RX 7800 XT is the practical choice. For workloads that need massive memory capacity, extreme bandwidth, or tensor core acceleration, the Rubin GPU is the only option with the recorded specifications to meet those demands.