AMD Radeon RX 6600 XT vs NVIDIA GeForce RTX 3070 Ti Mobile Comparison

The benchmark data places the NVIDIA GeForce RTX 3070 Ti Mobile as the clear performance winner over the AMD Radeon RX 6600 XT, taking 7 of 10 head-to-head tests. However, the AMD card is not without its own advantages, particularly in specific legacy DirectX workloads and 2D performance. The RTX 3070 Ti Mobile leads decisively in modern API tests and raw compute, while the RX 6600 XT counters with wins in DirectX 11, G2D, and a near-tie in compute. The choice between the two hinges on whether the user prioritizes peak modern gaming performance and bandwidth, or specific legacy API efficiency and 2D responsiveness.

The Verdict

The data is unambiguous: the NVIDIA GeForce RTX 3070 Ti Mobile is the superior GPU for modern gaming and general compute. Its average benchmark score of 23518 is lower than the AMD's 24442, but this is misleading, as the NVIDIA part wins the most important and demanding tests. In the 3DMark Steel Nomad DX12 test, the RTX 3070 Ti Mobile scores 2572 against the RX 6600 XT's 1804, a commanding 29.9% lead. The NVIDIA card also wins Geekbench OpenCL by 24.1% and Vulkan by 27.6%. For users targeting high-fidelity, modern titles, the RTX 3070 Ti Mobile is the definitive pick.

The AMD Radeon RX 6600 XT is the better choice only for a narrow set of scenarios. It wins the Passmark DirectX 11 test with a 6.5% margin, the G2D test by 16.5%, and edges out a 0.2% win in GPU compute. Its 70th percentile ranking among all GPUs is one point higher than the NVIDIA's 69th, but this is a statistical artifact of its higher average score from less demanding tests. If the workload is dominated by older DirectX 11 titles or 2D tasks, the RX 6600 XT has a case. Otherwise, the RTX 3070 Ti Mobile is the verdict for almost every user.

Architecture Differences

The two GPUs come from fundamentally different design philosophies and process nodes. The AMD Radeon RX 6600 XT uses the Navi 23 chip built on RDNA 2.0 architecture, fabricated on TSMC's 7 nm process. It packs 11,060 million transistors into a 237 mm² die, yielding a transistor density of 46.7 million per mm². The NVIDIA GeForce RTX 3070 Ti Mobile uses the GA104 chip with Ampere architecture, built on Samsung's 8 nm process, with 17,400 million transistors on a much larger 392 mm² die, resulting in a lower density of 44.4 million per mm².

The compute resources differ substantially. The RTX 3070 Ti Mobile has 5888 shading units, 184 TMUs, 96 ROPs, 46 RT cores, and 184 tensor cores. The RX 6600 XT has only 2048 shading units, 128 TMUs, 64 ROPs, and 32 RT cores, with no tensor cores. This explains the NVIDIA card's higher FP32 throughput of 16.60 TFLOPS versus the AMD's 10.60 TFLOPS. The NVIDIA part also handles FP16 at the same 16.60 TFLOPS (1:1 ratio), while the AMD achieves 21.21 TFLOPS FP16 via a 2:1 shader rate.

Memory architecture is another major divergence. Both have 8 GB of GDDR6, but the RTX 3070 Ti Mobile uses a 256-bit bus for 448.0 GB/s bandwidth, while the RX 6600 XT is limited to a 128-bit bus and 256.0 GB/s. The AMD card compensates with higher clock speeds, boosting to 2589 MHz versus the NVIDIA's 1410 MHz, but the bandwidth deficit remains a critical factor in high-resolution textures. The NVIDIA card also uses a PCIe 4.0 x16 interface, while the AMD uses PCIe 4.0 x8.

Head-to-Head Benchmarks

The 3DMark Steel Nomad DX12 test is the most significant differentiator. The RTX 3070 Ti Mobile scores 2572 versus 1804 for the RX 6600 XT, a 29.9% margin that represents the largest single win for either card. This test reflects modern DX12 workload efficiency, where the NVIDIA architecture's higher shader count and memory bandwidth dominate. The Geekbench results reinforce this pattern: the NVIDIA card leads OpenCL with 106022 against 80503 (24.1% delta) and Vulkan with 100027 against 72417 (27.6% delta).

The Passmark suite shows a more nuanced picture. In DirectX 10, the RTX 3070 Ti Mobile wins 124 to 109, a 12.1% margin. DirectX 12 shows a 16.4% win for NVIDIA (73 vs 61). The DirectX 9 test is nearly a tie, with NVIDIA winning 196 to 194, just a 1% delta. However, the AMD card takes the DirectX 11 test decisively, scoring 163 against 153, a 6.5% win. This suggests the RX 6600 XT has better optimization for legacy DX11 titles.

The 2D and compute tests reveal the AMD's strengths. Passmark G2D goes to the RX 6600 XT at 912 versus 783, a substantial 16.5% lead. The GPU compute test is essentially a dead heat, with AMD winning 7520 to 7504, a 0.2% margin. The overall Passmark G3D score favors NVIDIA, 17727 to 16461, a 7.1% difference. The RTX 3070 Ti Mobile also wins the DirectX 10 test by 12.1%, showing its dominance is less pronounced in older APIs but still present.

FAQ

Q: Which GPU has the higher average benchmark score?

A: The AMD Radeon RX 6600 XT has an average benchmark score of 24442, while the NVIDIA GeForce RTX 3070 Ti Mobile scores 23518. This is despite the NVIDIA card winning the majority of individual head-to-head tests.

Q: How large is the performance gap in the most demanding modern test?

A: In the 3DMark Steel Nomad DX12 test, the RTX 3070 Ti Mobile scores 2572, which is 29.9% higher than the RX 6600 XT's 1804 score. This is the largest performance delta between the two cards in any benchmark.

Q: Does the AMD card win any test by a significant margin?

A: Yes, the RX 6600 XT wins the Passmark G2D test with a score of 912 versus 783, a 16.5% margin. It also wins DirectX 11 by 6.5% and GPU compute by a slim 0.2%.

Q: What are the memory specifications for each card?

A: Both cards have 8 GB of GDDR6 memory. The NVIDIA card uses a 256-bit bus with 448.0 GB/s bandwidth, while the AMD card uses a 128-bit bus with 256.0 GB/s bandwidth. The AMD has a higher effective memory clock of 16 Gbps versus 14 Gbps for NVIDIA.

Q: How do the shading unit counts compare?

A: The RTX 3070 Ti Mobile has 5888 shading units, significantly more than the RX 6600 XT's 2048. The NVIDIA card also has 184 TMUs and 96 ROPs, compared to 128 TMUs and 64 ROPs on the AMD.

Q: Which card has a higher boost clock?

A: The AMD Radeon RX 6600 XT has a boost clock of 2589 MHz, far exceeding the RTX 3070 Ti Mobile's 1410 MHz boost clock. The AMD also has a higher base clock at 1968 MHz versus 915 MHz.

Where Each One Wins

The RTX 3070 Ti Mobile is the clear winner for modern gaming and compute-heavy tasks. Its 29.9% lead in 3DMark Steel Nomad DX12, 24.1% lead in OpenCL, and 27.6% lead in Vulkan make it the superior choice for DX12 titles, ray tracing workloads, and general GPU compute. The 7.1% win in Passmark G3D confirms its overall rasterization advantage. The NVIDIA card's 448.0 GB/s bandwidth and 16.60 TFLOPS FP32 performance provide the headroom needed for high-resolution textures and demanding visual effects.

The RX 6600 XT is the winner for specific legacy scenarios and 2D performance. Its 6.5% win in DirectX 11 makes it the better option for older game libraries that rely on that API. The 16.5% G2D lead suggests superior 2D rendering and desktop responsiveness. The 0.2% win in GPU compute is negligible, but it does show the AMD card is competitive in that specific metric. Its higher boost clock of 2589 MHz may provide lower latency in certain workloads, though this does not translate to overall wins.

The AMD card also wins on power efficiency in terms of TDP, with 160 W versus the NVIDIA's 115 W, though this is a mobile part with different constraints. The RX 6600 XT is a desktop card with a dual-slot form factor and a 1x 8-pin power connector, while the RTX 3070 Ti Mobile has no power connectors and is portable-device dependent. For users building a desktop system, the RX 6600 XT's fixed form factor is a consideration, but the NVIDIA card's performance lead is too substantial to ignore.

Specification Differences

The process nodes differ: AMD uses 7 nm TSMC, while NVIDIA uses 8 nm Samsung. This leads to different transistor counts and die sizes, with the AMD at 11,060 million transistors on 237 mm² and the NVIDIA at 17,400 million on 392 mm². The transistor density favors AMD at 46.7M / mm² versus 44.4M / mm² for NVIDIA.

Clock speeds are dramatically different. The AMD has a base clock of 1968 MHz and boost of 2589 MHz, with a game clock of 2359 MHz. The NVIDIA has a base of 915 MHz and boost of 1410 MHz. Memory clocks also differ: AMD runs at 2000 MHz (16 Gbps effective), while NVIDIA runs at 1750 MHz (14 Gbps effective). However, the NVIDIA card's 256-bit bus doubles the AMD's 128-bit bus, resulting in 448.0 GB/s versus 256.0 GB/s bandwidth.

The compute units are vastly different. The NVIDIA has 5888 shading units, 184 TMUs, 96 ROPs, 46 RT cores, and 184 tensor cores. The AMD has 2048 shading units, 128 TMUs, 64 ROPs, and 32 RT cores, with no tensor cores. This results in pixel rates of 165.7 GPixel/s for AMD versus 135.4 GPixel/s for NVIDIA, and texture rates of 331.4 GTexel/s versus 259.4 GTexel/s. The FP32 performance favors NVIDIA at 16.60 TFLOPS versus 10.60 TFLOPS, while FP16 favors AMD at 21.21 TFLOPS (2:1) versus 16.60 TFLOPS (1:1). The TDP is 160 W for AMD and 115 W for NVIDIA, and the AMD uses PCIe 4.0 x8 while NVIDIA uses x16.