AMD Radeon RX 6600 vs NVIDIA GeForce RTX 5090 D V2 Comparison

The Verdict

The data presents a stark contrast between two GPUs from different eras. The AMD Radeon RX 6600 is an end-of-life mainstream card built for 1080p gaming, while the NVIDIA GeForce RTX 5090 D V2 is an active flagship designed for maximum performance. Benchmark results show the RTX 5090 D V2 is decisively faster, scoring 16504 in 3DMark Steel Nomad DX12 versus 1492 for the RX 6600, a 91% advantage. This is not a comparison of equals; it is a generational and market-tier gap.

The RX 6600 belongs in systems where power efficiency and compact dimensions matter more than raw speed. Its 132 W TDP, 190 mm length, and single 8-pin connector make it a practical choice for small form factor builds. The RTX 5090 D V2, with a 575 W TDP, 304 mm length, and 16-pin connector, demands a large case and a robust power supply. The data indicates the RX 6600 is for builders who prioritize simplicity and lower system requirements, while the RTX 5090 D V2 is for those who need maximum compute throughput and are willing to accommodate its physical and electrical demands.

FAQ

Q: Which GPU has the higher average benchmark score?

A: The AMD Radeon RX 6600 has an average benchmark score of 19036 across all recorded tests. The NVIDIA GeForce RTX 5090 D V2 has an average score of 16504, but this is based on a single benchmark test, 3DMark Steel Nomad DX12, where it scored 16504 compared to the RX 6600's 1492.

Q: How do these cards compare in memory capacity and bandwidth?

A: The RTX 5090 D V2 has 24 GB of GDDR7 memory on a 384-bit bus, delivering 1.34 TB/s of bandwidth. The RX 6600 has 8 GB of GDDR6 memory on a 128-bit bus, providing 224.0 GB/s. The NVIDIA card offers triple the capacity and roughly six times the bandwidth.

Q: What are the power requirements for each card?

A: The RX 6600 has a TDP of 132 W and requires a 300 W power supply, using a single 8-pin connector. The RTX 5090 D V2 has a TDP of 575 W, needs a 950 W power supply, and uses a single 16-pin connector.

Q: Which card is physically smaller?

A: The RX 6600 is significantly more compact. It measures 190 mm in length, 110 mm in height, and 40 mm in width. The RTX 5090 D V2 is 304 mm long, 137 mm high, and 48 mm wide.

Q: Do both cards support the same API levels?

A: Yes, both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. This means feature-level API compatibility is identical, despite the large performance gap.

Q: How does the RX 6600 compare to its nearest rivals in the database?

A: The RX 6600's average score of 19036 is nearly identical to the NVIDIA Quadro K6000 (19030, 0% delta) and the NVIDIA GeForce RTX 4050 Mobile (19049, -0.1% delta). It is also 0.4% ahead of the NVIDIA RTX 2000 Ada Generation (18954) and 0.3% behind the NVIDIA Tesla K20m (19089).

Architecture Differences

The two GPUs come from fundamentally different architectures and manufacturing processes. The AMD Radeon RX 6600 uses the Navi 23 chip built on RDNA 2.0 architecture, fabricated on TSMC's 7 nm process. It contains 11,060 million transistors on a 237 mm² die, resulting in a transistor density of 46.7M per mm². The NVIDIA GeForce RTX 5090 D V2 uses the GB202 chip based on Blackwell 2.0 architecture, manufactured on a 5 nm process. This chip packs 92,200 million transistors onto a 750 mm² die, achieving a transistor density of 122.9M per mm².

The compute resources differ dramatically. The RX 6600 has 1792 shading units, 112 texture mapping units, 64 ROPs, and 28 ray tracing cores. It has no dedicated tensor cores. The RTX 5090 D V2 has 21760 shading units, 680 TMUs, 176 ROPs, 170 ray tracing cores, and 680 tensor cores. The NVIDIA card offers over twelve times the shading units and six times the ray tracing cores.

Memory technology also separates the two. The RX 6600 uses GDDR6 memory, while the RTX 5090 D V2 uses GDDR7. The bus interfaces differ as well: the RX 6600 uses PCIe 4.0 x8, while the RTX 5090 D V2 uses PCIe 5.0 x16. The NVIDIA card's tensor cores are notable, as they enable AI-accelerated workloads that the AMD card cannot perform through dedicated hardware.

Specification Differences

The clock speeds differ in interesting ways. The RX 6600 has a base clock of 1626 MHz, a boost clock of 2491 MHz, and a game clock of 2044 MHz. The RTX 5090 D V2 has a base clock of 2017 MHz and a boost clock of 2407 MHz, but no recorded game clock. Despite the lower boost clock, the NVIDIA card's massive core count delivers far higher throughput.

Memory specifications show a clear generational leap. The RX 6600 offers 8 GB of GDDR6 on a 128-bit bus with 224.0 GB/s bandwidth. The RTX 5090 D V2 provides 24 GB of GDDR7 on a 384-bit bus with 1.34 TB/s bandwidth. The NVIDIA card has 16 GB more memory and roughly six times the bandwidth.

Compute rates are similarly lopsided. The RX 6600 delivers 8.928 TFLOPS FP32 and 17.86 TFLOPS FP16 (2:1 ratio). The RTX 5090 D V2 delivers 104.8 TFLOPS FP32 and 104.8 TFLOPS FP16 (1:1 ratio). The NVIDIA card is over eleven times faster in FP32 and nearly six times faster in FP16. Pixel and texture rates follow the same pattern: 159.4 GPixel/s and 279.0 GTexel/s for AMD versus 423.6 GPixel/s and 1,636.8 GTexel/s for NVIDIA.

Physical specifications differ substantially. The RX 6600 is 190 mm long, 110 mm tall, and 40 mm wide. The RTX 5090 D V2 is 304 mm long, 137 mm tall, and 48 mm wide. Both are dual-slot cards. Power delivery is a major difference: the RX 6600 uses a single 8-pin connector with a 132 W TDP and 300 W suggested PSU, while the RTX 5090 D V2 uses a single 16-pin connector with a 575 W TDP and 950 W suggested PSU. Display outputs also differ: the RX 6600 has 1x HDMI 2.1 and 3x DisplayPort 1.4a, while the RTX 5090 D V2 has 1x HDMI 2.1b and 3x DisplayPort 2.1b.

The production status and release timing set them apart. The RX 6600 was released on 2021-10-12 and is end-of-life, with a launch MSRP of 329 USD. The RTX 5090 D V2 was released on 2025-08-14 and remains active, with a launch MSRP of 2,299 USD. The AMD card's predecessor is Navi and successor is Navi III. The NVIDIA card's predecessor is GeForce 40 and successor is GeForce 60.

Head-to-Head Benchmarks

The only direct comparison in the database is the 3DMark Steel Nomad DX12 test. The NVIDIA GeForce RTX 5090 D V2 scores 16504, while the AMD Radeon RX 6600 scores 1492. This represents a 91% delta in favor of the NVIDIA card, meaning the RTX 5090 D V2 is roughly eleven times faster in this workload.

This single benchmark result aligns with the broader specification gap. The RTX 5090 D V2's FP32 throughput of 104.8 TFLOPS versus 8.928 TFLOPS for the RX 6600 suggests that the 3DMark result reflects a real-world performance hierarchy, not an anomaly. The NVIDIA card also has a higher base clock (2017 MHz versus 1626 MHz), though its boost clock is slightly lower (2407 MHz versus 2491 MHz). The core count advantage of 21760 versus 1792 shading units is the dominant factor.

The average benchmark scores tell a different story when viewed in context. The RX 6600's average of 19036 is based on eleven tests, including Geekbench Metal (88398), Geekbench OpenCL (28850), Geekbench Vulkan (67623), and multiple Passmark tests. The RTX 5090 D V2's average of 16504 is based on only one test. This means the RX 6600's average is higher, but only because it has been exercised across a wider range of workloads. In the one test both cards share, the NVIDIA card dominates.

The percentile rankings are closer than expected: the RX 6600 sits at the 63rd percentile of all GPUs, while the RTX 5090 D V2 sits at the 59th percentile. This reflects the database's inclusion of many professional and workstation cards that score higher than the RTX 5090 D V2 in aggregated metrics. The nearest rivals for the RX 6600 include the NVIDIA Quadro K6000 (19030, 0% delta) and the RTX 4050 Mobile (19049, -0.1% delta). For the RTX 5090 D V2, the nearest rivals include the NVIDIA T400 (16508, 0% delta) and the AMD Radeon PRO W7500 (16415, 0.5% delta). These rival matches are based on average scores across different test suites, so they should not be interpreted as direct performance equivalence in gaming.

Where Each One Wins

The RTX 5090 D V2 wins in every scenario where raw compute throughput matters. Its 104.8 TFLOPS FP32 performance, 1.34 TB/s memory bandwidth, and 24 GB VRAM make it suitable for demanding workloads such as high-resolution rendering, large dataset processing, and AI inference through its 680 tensor cores. The 3DMark Steel Nomad result confirms its dominance in modern DX12 gaming workloads. The 170 ray tracing cores provide substantial hardware acceleration for ray-traced effects.

The RX 6600 wins in scenarios where power efficiency and physical footprint are priorities. Its 132 W TDP is less than a quarter of the RTX 5090 D V2's 575 W, and its 300 W suggested PSU requirement is far more modest than 950 W. The card's 190 mm length fits in compact cases where the 304 mm NVIDIA card would not. The single 8-pin connector is compatible with a wider range of power supplies. For a builder constructing a small form factor system or upgrading an older machine with limited power delivery, the RX 6600 is the practical choice.

The RX 6600 also holds an advantage in multi-test benchmark coverage. Its average score of 19036 across eleven tests indicates consistent performance across DirectX 9, 10, 11, 12, OpenCL, Metal, and Vulkan APIs. The RTX 5090 D V2 has only been recorded in a single DX12 test, so its broader API performance is not yet documented in the database. The RX 6600's Passmark scores show particular strength in G2D (889) and G3D (15096) tests, with lower scores in DirectX-specific tests (95 in DX10, 152 in DX11, 51 in DX12, 197 in DX9).

The production status favors the RTX 5090 D V2 for long-term availability. The RX 6600 is end-of-life, meaning supply will dwindle. The RTX 5090 D V2 is active and will remain available for purchase. The RTX 5090 D V2 also supports DisplayPort 2.1b, a newer standard than the RX 6600's DisplayPort 1.4a, which matters for high refresh rate displays at high resolutions. The NVIDIA card's PCIe 5.0 x16 interface provides twice the bandwidth of the RX 6600's PCIe 4.0 x8 connection, which can benefit data-intensive workloads.