NVIDIA RTX A1000 vs NVIDIA Rubin GPU Comparison

The Verdict

The data in the database presents two entirely different NVIDIA products. The RTX A1000 is a workstation GPU from the Ampere generation, built on an 8 nm Samsung process. The Rubin GPU is a server-class accelerator from the Rubin architecture, built on a 3 nm TSMC process. They share a manufacturer but almost nothing else. The A1000 is a shipping, actively produced card with a full benchmark record. The Rubin GPU has no recorded benchmarks, no average score, and a 50th percentile ranking by default. The A1000 sits at the 79th percentile of all GPUs in the database.

The RTX A1000 is for workstation tasks that need a compact, low-power card with display outputs. The Rubin GPU is for server compute where power, size, and display output are irrelevant. The A1000 delivers a 6.737 TFLOPS FP32 rate from a 50 W TDP. The Rubin GPU delivers 130.0 TFLOPS FP32 from a 2300 W TDP. Anyone choosing between these two is not comparing like-for-like products; the decision rests entirely on deployment context.

The recorded data shows the A1000 has three benchmark scores: 969 in 3DMark Steel Nomad DX12, 52078 in Geekbench OpenCL, and 49574 in Geekbench Vulkan. Its average benchmark score is 34207. The Rubin GPU has zero benchmark entries and an average score of 0, which places it at the 50th percentile by the database's sorting logic. This is not a performance verdict; it is an absence of data.

For a user who needs a workstation GPU today, the A1000 is the only choice with measurable results. For a user planning a server deployment around a next-generation Rubin accelerator, the A1000 is not a substitute. The Rubin GPU's 288 GB of HBM4 memory, 22.1 TB/s bandwidth, and 28672 shading units place it in a different performance class entirely, even without benchmark scores.

Where Each One Wins

The RTX A1000 wins in the measured benchmark arena. It has three recorded scores, all from mainstream graphics and compute tests. The 3DMark Steel Nomad DX12 score of 969 reflects its DirectX 12 Ultimate support with the 12_2 feature level. The Geekbench OpenCL score of 52078 and Vulkan score of 49574 show balanced compute and graphics API performance. Its average benchmark score of 34207 places it 0.2% above the RTX A2000 12 GB, 0.2% above the AMD Radeon RX 560 XT, 0.6% above the AMD Radeon RX 480, and 0.4% below the NVIDIA TITAN V. These are tight margins, indicating the A1000 sits in a dense performance cluster.

The Rubin GPU wins in raw specification comparisons, though no benchmarks exist. Its FP32 throughput of 130.0 TFLOPS is 19.3 times the A1000's 6.737 TFLOPS. Its FP16 rate of 260.0 TFLOPS (2:1 ratio) is 38.6 times the A1000's FP16 rate of 6.737 TFLOPS (1:1 ratio). Its texture rate of 2,031.2 GTexel/s is 19.3 times the A1000's 105.3 GTexel/s. Its memory bandwidth of 22.1 TB/s is 115.1 times the A1000's 192.0 GB/s. The Rubin GPU has 28672 shading units against 2304, 896 tensor cores against 72, and 896 TMUs against 72.

The A1000 wins on physical integration. It is a single-slot card, 163 mm long and 69 mm high, drawing 50 W with no power connectors and a suggested PSU of 250 W. It outputs to 4x mini-DisplayPort 1.4a. The Rubin GPU is an SXM module with no display outputs, a 2300 W TDP, and a suggested PSU of 2700 W. The A1000 uses PCIe 4.0 x8; the Rubin GPU uses PCIe 6.0 x16.

Architecture Differences

The two GPUs come from different architectures, built by different foundries on different nodes. The A1000 uses the GA107 chip, an Ampere architecture part on Samsung's 8 nm process. It integrates 8,700 million transistors on a 200 mm² die, giving a transistor density of 43.5M per mm². The Rubin GPU uses the GR100 chip, a Rubin architecture part on TSMC's 3 nm process. It integrates 336,000 million transistors on a 1456 mm² die, giving a transistor density of 230.8M per mm². That is a 5.9 times higher transistor density and a 38.6 times higher total transistor count.

The memory subsystems differ fundamentally. The A1000 has 8 GB of GDDR6 on a 128-bit bus, with 1500 MHz memory clock and 12 Gbps effective speed, producing 192.0 GB/s bandwidth. The Rubin GPU has 288 GB of HBM4 on a 16384-bit bus, with 2695 MHz memory clock and 10.8 Gbps effective speed, producing 22.1 TB/s bandwidth. The bus width is 128 times wider, and capacity is 36 times larger.

Compute resources scale accordingly. The A1000 has 2304 shading units, 72 TMUs, 32 ROPs, 18 RT cores, and 72 tensor cores. The Rubin GPU has 28672 shading units, 896 TMUs, 24 ROPs, and 896 tensor cores. The RT core count for the Rubin GPU is not recorded in the database. The A1000's pixel rate is 46.78 GPixel/s, while the Rubin GPU's is 54.41 GPixel/s, a modest 16% difference despite the massive shading unit gap, because the Rubin GPU has fewer ROPs (24 versus 32).

Clock behavior differs. The A1000 has a base clock of 727 MHz and a boost of 1462 MHz. The Rubin GPU has a base clock of 700 MHz and a boost of 2267 MHz. The boost clock is 55% higher, but the base clocks are nearly identical. The A1000's FP16 runs at 1:1 with FP32, while the Rubin GPU's FP16 runs at 2:1, doubling its FP16 throughput relative to FP32.

The A1000 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The Rubin GPU reports N/A for DirectX, OpenGL, and Vulkan, reflecting its server orientation with no display outputs. The A1000 has a production status of Active and a release date of 2024-04-15. The Rubin GPU also has a production status of Active and a release date of 2025-12-31. The A1000's predecessor is Quadro Turing and its successor is Workstation Ada. The Rubin GPU's predecessor is Server Blackwell and it has no successor recorded.

FAQ

Q: Which GPU has better benchmark scores?

A: The RTX A1000 has all recorded benchmarks. It scores 969 in 3DMark Steel Nomad DX12, 52078 in Geekbench OpenCL, and 49574 in Geekbench Vulkan. The Rubin GPU has no recorded benchmarks and an average score of 0.

Q: How does the RTX A1000 compare to its nearest rivals in average score?

A: The A1000's average score of 34207 is 0.2% above the RTX A2000 12 GB (34154), 0.2% above the AMD Radeon RX 560 XT (34133), 0.6% above the AMD Radeon RX 480 (33997), and 0.4% below the NVIDIA TITAN V (34355).

Q: What is the memory capacity difference?

A: The RTX A1000 has 8 GB of GDDR6 on a 128-bit bus with 192.0 GB/s bandwidth. The Rubin GPU has 288 GB of HBM4 on a 16384-bit bus with 22.1 TB/s bandwidth, which is 36 times the capacity and 115.1 times the bandwidth.

Q: Can the Rubin GPU drive displays?

A: No. The Rubin GPU has no display outputs, while the RTX A1000 has 4x mini-DisplayPort 1.4a outputs. The Rubin GPU's API support for DirectX, OpenGL, and Vulkan is listed as N/A.

Q: What are the power requirements?

A: The RTX A1000 has a 50 W TDP, no power connectors, and a suggested PSU of 250 W. The Rubin GPU has a 2300 W TDP and a suggested PSU of 2700 W.

Q: Which GPU has more tensor cores?

A: The Rubin GPU has 896 tensor cores, compared to 72 on the RTX A1000. The Rubin GPU's FP16 throughput is 260.0 TFLOPS (2:1 ratio), while the A1000's is 6.737 TFLOPS (1:1 ratio).

Head-to-Head Benchmarks

The database records no direct head-to-head benchmark comparisons between the RTX A1000 and the Rubin GPU. The winsA and winsB fields are both 0. This absence is itself informative. The two products occupy different segments, and no common test has been run on both.

The A1000's measurable performance comes from three tests. In 3DMark Steel Nomad DX12, it scores 969. This test exercises DirectX 12 Ultimate features, which the A1000 supports at the 12_2 feature level. The Rubin GPU lists DirectX as N/A, so this test cannot run on it. In Geekbench OpenCL, the A1000 scores 52078. In Geekbench Vulkan, it scores 49574. The Vulkan score is 4.8% lower than the OpenCL score, a modest gap that reflects the A1000's balanced API support. The Rubin GPU lists Vulkan as N/A.

The closest rival data for the A1000 shows how tightly packed its performance tier is. The A2000 12 GB averages 34154, just 0.2% below the A1000. The TITAN V averages 34355, 0.4% above. The RX 560 XT averages 34133, 0.2% below, and the RX 480 averages 33997, 0.6% below. These deltas are within noise for most workloads. The A1000 is not a performance outlier; it is a consistent mid-pack workstation card.

The Rubin GPU's specification sheet tells a different story. Its FP32 rate of 130.0 TFLOPS is 19.3 times the A1000's 6.737 TFLOPS. Its FP16 rate of 260.0 TFLOPS is 38.6 times the A1000's 6.737 TFLOPS. Its texture rate of 2,031.2 GTexel/s is 19.3 times the A1000's 105.3 GTexel/s. Its pixel rate of 54.41 GPixel/s is only 16% higher, because ROP count is lower (24 versus 32). Its memory bandwidth of 22.1 TB/s is 115.1 times higher. Its shading unit count is 12.4 times higher. Its tensor core count is 12.4 times higher.

Clock rates matter here. The A1000's base clock of 727 MHz and boost of 1462 MHz produce a 6.737 TFLOPS FP32 rate from 2304 shading units. The Rubin GPU's base clock of 700 MHz and boost of 2267 MHz produce 130.0 TFLOPS FP32 from 28672 shading units. The Rubin GPU's boost clock is 55% higher, but the shading unit count is 12.4 times higher, so the throughput scales far beyond clock differences.

The process node gap is the architectural root of this difference. The A1000 on 8 nm Samsung achieves 43.5M transistors per mm². The Rubin GPU on 3 nm TSMC achieves 230.8M transistors per mm². That density allows the Rubin GPU to pack 336,000 million transistors into a 1456 mm² die, while the A1000 fits 8,700 million into 200 mm². The Rubin GPU's die is 7.3 times larger, but its transistor count is 38.6 times higher.

The A1000's memory clock of 1500 MHz (12 Gbps effective) and 128-bit bus yield 192.0 GB/s. The Rubin GPU's memory clock of 2695 MHz (10.8 Gbps effective) and 16384-bit bus yield 22.1 TB/s. The effective memory speed is lower on the Rubin GPU (10.8 Gbps versus 12 Gbps), but the bus width compensates by a factor of 128. The result is a bandwidth advantage of 115.1 times.

The A1000 is a single-slot, 163 mm long card with no power connectors. The Rubin GPU is an SXM module with a 2300 W TDP. The suggested PSU scales from 250 W to 2700 W. The A1000's 50 W TDP allows deployment in systems where the Rubin GPU's power draw would be prohibitive. The Rubin GPU's PCIe 6.0 x16 interface doubles the lane width and generational bandwidth compared to the A1000's PCIe 4.0 x8.

The release dates bracket a full generation gap. The A1000 launched on 2024-04-15. The Rubin GPU is dated 2025-12-31. The A1000 follows Quadro Turing and precedes Workstation Ada. The Rubin GPU follows Server Blackwell and has no successor. The A1000's benchmark percentile of 79 places it above most GPUs in the database, while the Rubin GPU's default 50th percentile reflects its empty benchmark record, not its expected performance class.