AMD Radeon RX 6750 XT vs NVIDIA GeForce RTX 3090 Comparison

# Head-to-Head Benchmarks

The benchmark data presents a decisive overall picture: NVIDIA GeForce RTX 3090 wins 9 of the 10 head-to-head tests, with AMD Radeon RX 6750 XT taking a single victory. The scale of those wins, however, varies dramatically across workloads, revealing distinct performance profiles.

The most lopsided result appears in Geekbench OpenCL, where the RTX 3090 scores 172,758 against the RX 6750 XT's 16,360. That is a 956% advantage, the single largest delta in the entire comparison. This gap dwarfs every other metric, suggesting a fundamental difference in how the two cards handle general-purpose compute workloads. The RTX 3090's FP32 throughput of 35.58 TFLOPS versus 13.31 TFLOPS for the RX 6750 XT aligns with this outcome, as does the NVIDIA card's 1:1 FP16 ratio compared to AMD's 2:1 implementation.

In 3DMark Steel Nomad DX12, the RTX 3090 posts 5,118 points against 2,548, a 100.9% lead. This benchmark reflects modern gaming workloads, and the margin here is substantial—the NVIDIA card delivers more than double the performance. The PassMark suite further reinforces NVIDIA's dominance: DirectX 10 shows a 45.6% lead (182 vs 125), DirectX 11 a 22.2% edge (220 vs 180), and DirectX 12 a 37.5% advantage (110 vs 80). These results indicate that across multiple DirectX API generations, the RTX 3090 maintains a consistent upper hand.

PassMark G3D, which aggregates overall 3D graphics performance, shows the RTX 3090 at 26,645 versus 20,700—a 28.7% lead. GPU compute in PassMark extends this to 15,356 against 9,550, a 60.8% margin. Even the closest traditional benchmark, PassMark DirectX 9, favors NVIDIA narrowly at 268 vs 263, a 1.9% difference that falls within run-to-run variance territory.

The one AMD victory comes in Geekbench Vulkan, where the RX 6750 XT scores 98,089 against the RTX 3090's 53,927—a 45% advantage for AMD. This is a notable reversal, as Vulkan is a low-level API that often favors efficient driver architectures. The RX 6750 XT's RDNA 2.0 design appears to excel in this specific environment, despite losing in every other comparison.

Architecture Differences

The two cards represent fundamentally different design philosophies from different foundries and process nodes. The RTX 3090 uses the GA102 chip on an 8 nm Samsung process, measuring 628 mm² with 28,300 million transistors. This yields a transistor density of 45.1M per mm². The RX 6750 XT counters with Navi 22 on a 7 nm TSMC process, a smaller 335 mm² die with 17,200 million transistors, achieving a higher density of 51.3M per mm². The smaller, denser AMD chip reflects a more modern manufacturing node.

The RTX 3090's Ampere architecture is built around a massive array of compute resources: 10,496 shading units, 328 TMUs, 112 ROPs, 82 RT cores, and 328 tensor cores. The RX 6750 XT's RDNA 2.0 design is far leaner, with 2,560 shading units, 160 TMUs, 64 ROPs, and 40 RT cores. Notably, the AMD card has no tensor core equivalent listed, while the NVIDIA card's tensor cores are a defining feature. This resource disparity explains much of the compute performance gap, particularly in OpenCL where the RTX 3090's advantage exceeded 950%.

Memory architecture differs substantially as well. The RTX 3090 pairs 24 GB of GDDR6X memory on a 384-bit bus, delivering 936.2 GB/s bandwidth. The RX 6750 XT offers 12 GB of GDDR6 on a 192-bit bus, with 432.0 GB/s bandwidth. The NVIDIA card provides exactly double the memory capacity and roughly 117% more bandwidth. These figures matter for high-resolution textures and large datasets, though both cards remain competitive for their respective market positions.

Clock speeds tell a different story. The RX 6750 XT runs at a 2,150 MHz base and 2,600 MHz boost, with a 2,495 MHz game clock. The RTX 3090's 1,395 MHz base and 1,695 MHz boost are significantly lower. AMD's higher clocks partially compensate for fewer compute units, but cannot close the raw throughput gap. The FP32 output of 35.58 TFLOPS for NVIDIA versus 13.31 TFLOPS for AMD reflects this balance.

Both cards support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, placing them on equal footing for modern API compatibility. Display outputs are identical: 1x HDMI 2.1 and 3x DisplayPort 1.4a.

Where Each One Wins

The RTX 3090 dominates in nearly every measurable category, but the specific workloads where it wins reveal its intended use cases. OpenCL compute performance, with its 956% lead, positions the RTX 3090 as a serious workstation tool for GPU-accelerated applications that leverage OpenCL. The 60.8% advantage in PassMark GPU compute reinforces this, suggesting strong performance in rendering, scientific simulation, and other compute-heavy tasks. The 100.9% lead in 3DMark Steel Nomad DX12 indicates excellent modern gaming performance at high settings and resolutions, where the card's bandwidth and shading power come into play.

The RX 6750 XT's lone Vulkan win is worth examining. A 45% lead in Geekbench Vulkan (98,089 vs 53,927) suggests that in Vulkan-based games or applications, the AMD card can outperform its larger rival. This could matter for users running Vulkan-native titles or using APIs that bypass DirectX. However, the overall PassMark DirectX results show NVIDIA leading across the board, so this Vulkan advantage does not translate to broader gaming superiority.

For productivity workloads, the RTX 3090's 24 GB memory capacity and 936.2 GB/s bandwidth make it suitable for large datasets, while the RX 6750 XT's 12 GB and 432.0 GB/s may encounter limits sooner. The PassMark G2D score of 1,063 vs 972 (a 9.4% lead) shows NVIDIA also edges ahead in 2D graphics tasks, though this margin is modest.

Specification Differences

The specification sheet highlights several key differentiators between these two cards. The RTX 3090 ships with 24 GB of GDDR6X memory on a 384-bit bus, while the RX 6750 XT offers 12 GB of GDDR6 on a 192-bit bus—a direct doubling of capacity and bus width for NVIDIA. Memory bandwidth follows suit at 936.2 GB/s versus 432.0 GB/s.

Compute resources diverge sharply: the RTX 3090 has 10,496 shading units, 328 TMUs, 112 ROPs, 82 RT cores, and 328 tensor cores. The RX 6750 XT has 2,560 shading units, 160 TMUs, 64 ROPs, and 40 RT cores, with no tensor cores. Pixel rate favors NVIDIA at 189.8 GPixel/s versus 166.4 GPixel/s, as does texture rate at 556.0 GTexel/s versus 416.0 GTexel/s.

Power requirements differ meaningfully. The RTX 3090 draws 350 W TDP and requires a 750 W suggested PSU, while the RX 6750 XT runs at 250 W TDP with a 600 W suggested PSU. Physical dimensions vary accordingly: the RTX 3090 measures 336 mm x 140 mm x 61 mm and takes a triple-slot width, whereas the RX 6750 XT is 267 mm x 110 mm x 40 mm with a dual-slot design. Power connectors differ as well—the RTX 3090 uses a single 12-pin, while the RX 6750 XT uses 1x 6-pin plus 1x 8-pin.

Process technology and chip construction also differ: the RTX 3090 uses Samsung's 8 nm node with a 628 mm² die and 28,300 million transistors, while the RX 6750 XT uses TSMC's 7 nm node with a 335 mm² die and 17,200 million transistors. The AMD card's higher transistor density (51.3M per mm² vs 45.1M per mm²) reflects the more advanced process.

FAQ

Q: Which card has higher overall benchmark performance?

A: The NVIDIA GeForce RTX 3090 has an average benchmark score of 27,565, which sits at the 73rd percentile of all GPUs. The AMD Radeon RX 6750 XT averages 26,011, placing it at the 71st percentile. The RTX 3090 wins 9 of 10 head-to-head comparisons.

Q: What is the biggest performance gap between the two cards?

A: In Geekbench OpenCL, the RTX 3090 scores 172,758 against the RX 6750 XT's 16,360, representing a 956% difference. This is the largest delta in any shared benchmark.

Q: Is there any test where the AMD card wins?

A: Yes, in Geekbench Vulkan, the RX 6750 XT scores 98,089 versus the RTX 3090's 53,927, a 45% advantage for AMD. This is the only head-to-head win for the AMD card.

Q: How do the memory subsystems compare?

A: The RTX 3090 has 24 GB of GDDR6X memory on a 384-bit bus with 936.2 GB/s bandwidth. The RX 6750 XT has 12 GB of GDDR6 on a 192-bit bus with 432.0 GB/s bandwidth. NVIDIA provides double the capacity and more than double the bandwidth.

Q: What are the power requirements for each card?

A: The RTX 3090 has a 350 W TDP and suggests a 750 W PSU. The RX 6750 XT has a 250 W TDP and suggests a 600 W PSU. The AMD card is more power-efficient per watt.

Q: Which card has more processing units?

A: The RTX 3090 has 10,496 shading units, 328 TMUs, 112 ROPs, 82 RT cores, and 328 tensor cores. The RX 6750 XT has 2,560 shading units, 160 TMUs, 64 ROPs, and 40 RT cores with no tensor cores.

The Verdict

The data points to a clear hierarchy: the NVIDIA GeForce RTX 3090 is the substantially faster card, winning 9 of 10 benchmarks with an average score of 27,565 compared to the RX 6750 XT's 26,011. Its FP32 throughput of 35.58 TFLOPS, 24 GB memory configuration, and 936.2 GB/s bandwidth make it the choice for users who need maximum compute performance, high-resolution gaming, or large-memory workloads. The 956% OpenCL lead and 60.8% PassMark GPU compute advantage are decisive for GPU compute tasks.

The RX 6750 XT, with its 250 W TDP, dual-slot design, and 267 mm length, is the more compact and power-efficient option. Its 45% Vulkan win suggests it may be preferable for Vulkan-focused use cases, and its higher clocks (2,600 MHz boost vs 1,695 MHz) indicate strong per-watt performance. However, its 13.31 FP32 TFLOPS and 12 GB memory limit its ceiling in compute and large-texture scenarios.

Users prioritizing raw performance, compute capability, and memory capacity should select the RTX 3090. Users who value efficiency, smaller physical footprint, and Vulkan API performance—and who can work within 12 GB memory—will find the RX 6750 XT adequate for their needs. The benchmark data does not support the RX 6750 XT as a performance equal, but it does carve out a niche where its Vulkan efficiency and lower power draw are meaningful advantages.