NVIDIA RTX 4000 SFF Ada Generation vs NVIDIA RTX 6000 Ada Generation Comparison

Head-to-Head Benchmarks

The recorded head-to-head data shows a decisive performance gap between these two workstation GPUs. In the Geekbench OpenCL test, the NVIDIA RTX 6000 Ada Generation scores 311,629 against the RTX 4000 SFF Ada Generation's 124,812, a 149.7% advantage. The Vulkan results tell a similar story: 262,845 versus 109,364, which puts the RTX 6000 ahead by 140.3%. Both tests use the same API, the same driver stack, and the same test methodology, so the delta is purely a function of hardware capability.

What is striking is not just the magnitude of the win, but the consistency. The RTX 6000 nearly doubles the RTX 4000 SFF in both compute-oriented workloads. The OpenCL margin (149.7%) is slightly wider than Vulkan (140.3%), which suggests the gap is not API-specific but instead reflects a fundamental difference in raw throughput. When a GPU wins by that much in two different graphics and compute APIs, it points to a hardware resource advantage that software cannot paper over.

The average benchmark score in the database reinforces this picture. The RTX 6000 carries an average of 287,237 across all recorded tests, while the RTX 4000 SFF averages 117,088. That is a 2.45x difference in aggregate performance. The RTX 6000 sits in the 99th percentile of all GPUs in the database, meaning it outperforms 99% of everything else tracked. The RTX 4000 SFF, by contrast, lands in the 95th percentile, which is still strong but clearly a tier below.

Looking at the nearest rivals for each card puts the gap in context. The RTX 6000's closest competitor is the NVIDIA L40, which averages 284,111, only 1.1% behind. The L40S comes in at 295,763, which is 2.9% ahead of the RTX 6000. The AMD Instinct MI300X leads the RTX 6000 by 9.7% with an average score of 317,994. The NVIDIA L20 trails by 14.4% at 251,147. So the RTX 6000 is firmly in the top tier of workstation compute, trading blows with dedicated AI accelerators and flagship data center cards.

The RTX 4000 SFF's rivals are a different class entirely. The NVIDIA GB10 scores 117,393, a 0.3% edge over the RTX 4000 SFF. The AMD Radeon PRO W7700 is 1.6% ahead at 118,976. The older Tesla V100 SXM2 16 GB trails by 2.4% at 114,395, and the RTX A5500 Mobile is 2.8% behind at 113,944. These are all mid-range or previous-generation parts, and the RTX 4000 SFF is competitive with them, but none of them come close to the RTX 6000's performance tier.

The Verdict

The data is unambiguous: the RTX 6000 Ada Generation wins every recorded benchmark against the RTX 4000 SFF Ada Generation. The database shows 2 wins for the RTX 6000 and 0 for the RTX 4000 SFF. If raw performance is the only criterion, the choice is clear.

But the verdict should be nuanced by what each card is designed to do. The RTX 6000 is a dual-slot, 300 W behemoth with a 267 mm length. The RTX 4000 SFF is also dual-slot, but it is 168 mm long, draws only 70 W, and requires no power connector at all. The suggested PSU for the RTX 6000 is 700 W, while the RTX 4000 SFF only asks for 250 W. These are not competing in the same physical or thermal envelope.

The RTX 4000 SFF is for constrained chassis, low-power workstations, or dense multi-GPU setups where space and heat are the limiting factors. The RTX 6000 is for a single powerful compute node where performance is paramount and power budget is secondary. The benchmark delta of roughly 2.4x in average score is the price you pay for the SFF form factor, and the data says that tradeoff is substantial.

For users who need the maximum compute throughput per card, the RTX 6000 is the only choice from these two. For users who need to fit a workstation GPU into a small chassis with minimal power draw, the RTX 4000 SFF is the only option that exists in this comparison. The data does not support a middle ground, because the performance gap is too wide to be bridged by any workload the database records.

Architecture Differences

Both cards are built on the Ada Lovelace architecture and use TSMC's 5 nm process node. That is where the similarities end. The RTX 6000 uses the AD102 chip, which is the largest Ada die at 609 mm² with 76,300 million transistors. The RTX 4000 SFF uses the AD104 chip, a 294 mm² die with 35,800 million transistors. The transistor density is nearly identical (125.3M per mm² for AD102 versus 121.8M per mm² for AD104), which confirms both are on the same process, but the AD102 packs more than twice the silicon area and more than twice the transistor count.

The RTX 6000 has 18,176 shading units, 568 texture mapping units, and 192 render output units. The RTX 4000 SFF has 6,144 shading units, 192 TMUs, and 64 ROPs. That is a 2.96x difference in shading units, a 2.96x difference in TMUs, and a 3.0x difference in ROPs. The RTX 6000 also has 142 RT cores and 568 tensor cores, versus 48 RT cores and 192 tensor cores on the RTX 4000 SFF. The ratio is roughly 3:1 across every compute resource, which explains why the benchmark scores scale nearly linearly with the hardware count.

The memory architecture is another major divergence. The RTX 6000 ships with 48 GB of GDDR6 on a 384-bit bus, yielding 960.0 GB/s of bandwidth. The RTX 4000 SFF has 20 GB of GDDR6 on a 160-bit bus, providing 280.0 GB/s. That is a 3.43x bandwidth advantage for the RTX 6000, which matters for memory-bound workloads like large dataset processing or high-resolution rendering. The RTX 6000 also runs its memory at 2500 MHz (20 Gbps effective), while the RTX 4000 SFF runs at 1750 MHz (14 Gbps effective). Both use GDDR6, but the RTX 6000's wider bus and faster memory clock create a massive throughput gap.

Clock speeds tell a different story. The RTX 6000 has a base clock of 915 MHz and a boost of 2505 MHz. The RTX 4000 SFF has a base of 720 MHz and a boost of 1560 MHz. The RTX 6000 boosts 60.6% higher, which compounds with the 3x resource advantage to produce the observed performance delta. The pixel rate is 481.0 GPixel/s for the RTX 6000 versus 99.84 GPixel/s for the RTX 4000 SFF, and the texture rate is 1,422.8 GTexel/s versus 299.5 GTexel/s. These are not incremental differences; they are structural.

Specification Differences

The two cards share the same architecture, process node, foundry, API support (DirectX 12 Ultimate, OpenGL 4.6, Vulkan 1.4), and PCIe interface (PCIe 4.0 x16). They also share the same predecessor (Workstation Ampere) and successor (Blackwell PRO W) in the database. The differences are extensive beyond that.

The RTX 6000 has a base clock of 915 MHz and boost of 2505 MHz; the RTX 4000 SFF has 720 MHz base and 1560 MHz boost. Memory is 48 GB versus 20 GB, with bus widths of 384-bit versus 160-bit, and bandwidth of 960.0 GB/s versus 280.0 GB/s. Memory clocks are 2500 MHz versus 1750 MHz. The compute resources are 18,176 versus 6,144 shading units, 568 versus 192 TMUs, 192 versus 64 ROPs, 142 versus 48 RT cores, and 568 versus 192 tensor cores. FP32 performance is 91.06 TFLOPS versus 19.17 TFLOPS, and FP16 is identical at 91.06 versus 19.17 TFLOPS (both 1:1).

Power and physical specs diverge sharply. The RTX 6000 draws 300 W and requires a 16-pin power connector, while the RTX 4000 SFF draws 70 W and needs no connector at all. Suggested PSU is 700 W versus 250 W. The RTX 6000 is 267 mm long and 112 mm high; the RTX 4000 SFF is 168 mm long and 69 mm high. Display outputs are 4x DisplayPort 1.4a on the RTX 6000 versus 4x mini-DisplayPort 1.4a on the RTX 4000 SFF. The RTX 6000 is end-of-life, while the RTX 4000 SFF is active production. The RTX 6000 launched on 2022-12-02 with a launch MSRP of 6,799 USD; the RTX 4000 SFF launched on 2023-03-20 with no recorded MSRP.

FAQ

Q: Which GPU has the higher average benchmark score?

A: The NVIDIA RTX 6000 Ada Generation averages 287,237 across all recorded tests, while the RTX 4000 SFF Ada Generation averages 117,088. The RTX 6000 outperforms the RTX 4000 SFF by roughly 2.45x.

Q: How much faster is the RTX 6000 in OpenCL?

A: In the Geekbench OpenCL test, the RTX 6000 scores 311,629 versus 124,812 for the RTX 4000 SFF, a 149.7% advantage.

Q: What is the memory bandwidth difference?

A: The RTX 6000 provides 960.0 GB/s of bandwidth from 48 GB of GDDR6 on a 384-bit bus. The RTX 4000 SFF provides 280.0 GB/s from 20 GB of GDDR6 on a 160-bit bus. That is a 3.43x difference.

Q: Does the RTX 4000 SFF require a power connector?

A: No. The RTX 4000 SFF has no power connector and draws 70 W, while the RTX 6000 requires a 16-pin connector and draws 300 W.

Q: How do these cards compare to their nearest rivals?

A: The RTX 6000 is 1.1% ahead of the NVIDIA L40, 2.9% behind the L40S, 9.7% behind the AMD Instinct MI300X, and 14.4% ahead of the NVIDIA L20. The RTX 4000 SFF is 0.3% behind the NVIDIA GB10, 1.6% behind the AMD Radeon PRO W7700, 2.4% ahead of the Tesla V100 SXM2 16 GB, and 2.8% ahead of the RTX A5500 Mobile.

Q: Which GPU has more RT cores?

A: The RTX 6000 has 142 RT cores, while the RTX 4000 SFF has 48 RT cores. The RTX 6000 also has 568 tensor cores versus 192 on the RTX 4000 SFF.

Where Each One Wins

The RTX 6000 Ada Generation wins every benchmark in the database, but the nature of the wins suggests where each card belongs. The RTX 6000's 91.06 TFLOPS of FP32 and FP16 performance, combined with 960.0 GB/s of memory bandwidth, make it suited for large-scale compute tasks: training or inference workloads that fit within 48 GB of VRAM, high-resolution rendering, scientific simulation, or any task where the GPU is the bottleneck and the chassis can accommodate a 300 W, 267 mm card. Its 99th percentile ranking puts it among the top 1% of all GPUs tracked.

The RTX 4000 SFF is not a compute monster, but it has its own domain. At 70 W with no power connector, it can fit into small form factor workstations, industrial PCs, or blade systems where the RTX 6000 physically cannot go. Its 20 GB of VRAM is still substantial, and its 95th percentile ranking means it beats the vast majority of GPUs in the database. For tasks like CAD, 3D modeling, moderate video editing, or rendering that does not require massive parallel throughput, the RTX 4000 SFF delivers acceptable performance in a fraction of the power envelope.

The data shows a clear split: the RTX 6000 wins on absolute performance, and the RTX 4000 SFF wins on power efficiency and physical footprint. The RTX 6000's 300 W TDP is 4.29x higher than the RTX 4000 SFF's 70 W, but its average score is 2.45x higher. That means the RTX 4000 SFF delivers more performance per watt, even though the RTX 6000 delivers more absolute performance. The RTX 4000 SFF also fits in a 168 mm length versus 267 mm, which is the difference between a compact workstation and a full-size expansion slot.

For users who prioritize raw compute, the RTX 6000 is the only rational pick from this pair. For users who prioritize space, heat, and power, the RTX 4000 SFF is the only viable option. The database does not record any workload where the RTX 4000 SFF wins, so any decision must weigh the RTX 6000's dominant benchmark performance against the RTX 4000 SFF's unique physical advantages.