AMD Radeon RX 6600 LE vs NVIDIA L4 Comparison

FAQ

Q: How do the NVIDIA L4 and AMD Radeon RX 6600 LE compare in overall benchmark scores?

A: The NVIDIA L4 records an average benchmark score of 131,072, while the AMD Radeon RX 6600 LE records 70,829. The L4 sits in the 95th percentile of all GPUs, whereas the RX 6600 LE sits in the 91st percentile.

Q: Which GPU wins in OpenCL performance?

A: The NVIDIA L4 wins decisively. It scores 140,838 in Geekbench OpenCL versus 69,229 for the AMD Radeon RX 6600 LE, a 103.4% difference.

Q: Which GPU wins in Vulkan performance?

A: The NVIDIA L4 wins again. It scores 121,306 in Geekbench Vulkan versus 72,428 for the AMD Radeon RX 6600 LE, a 67.5% difference.

Q: What are the nearest rivals to the NVIDIA L4 in the database?

A: The nearest rivals are the NVIDIA GeForce RTX 3090 Ti (average score 131,938, 0.7% above the L4), the NVIDIA RTX 4000 Ada Generation (135,218, 3.1% above), the NVIDIA A10M (135,230, 3.1% above), and the AMD Radeon PRO W6800 (135,396, 3.2% above).

Q: What are the nearest rivals to the AMD Radeon RX 6600 LE in the database?

A: The nearest rivals are the NVIDIA RTX A3000 Mobile (average score 70,140, 1% below the RX 6600 LE), the NVIDIA Quadro P6000 (69,986, 1.2% below), the AMD Radeon RX 6650M (71,768, 1.3% above), and the AMD Radeon Pro WX 8200 (69,870, 1.4% below).

Q: Do both GPUs support the same API feature levels?

A: Yes, both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The key difference is that the NVIDIA L4 also includes 240 tensor cores, which the AMD part does not list.

Where Each One Wins

The benchmark record shows a clear split: the NVIDIA L4 wins both recorded head-to-head tests, with no wins recorded for the AMD Radeon RX 6600 LE. The L4’s OpenCL score of 140,838 is more than double the RX 6600 LE’s 69,229, and its Vulkan score of 121,306 is 67.5% higher than the RX 6600 LE’s 72,428.

The L4’s advantage is not marginal. In OpenCL, the delta is 103.4%, meaning the L4 delivers roughly twice the compute throughput in that workload. In Vulkan, the L4 still leads by a wide margin, though the gap narrows to 67.5%. This pattern suggests the L4 is built for compute-heavy tasks, while the RX 6600 LE remains competitive only in lighter graphics workloads where the API overhead and driver optimization matter more.

The RX 6600 LE’s only relative strength comes from its position among its own peers. It sits 1% above the NVIDIA RTX A3000 Mobile and 1.2% above the NVIDIA Quadro P6000, but it trails the AMD Radeon RX 6650M by 1.3%. The L4, by contrast, sits within 1% of the GeForce RTX 3090 Ti, a much higher performance tier. If the task is maximizing compute output, the L4 is the unambiguous choice. If the task is a lower-power, lower-throughput workload where the RX 6600 LE’s smaller footprint matters, the AMD part may suffice, but the data does not show any benchmark where it outpaces the L4.

Architecture Differences

The NVIDIA L4 uses the AD104 chip built on Ada Lovelace architecture, fabricated on a 5 nm process at TSMC. The AMD Radeon RX 6600 LE uses the Navi 23 chip built on RDNA 2.0 architecture, also fabricated at TSMC but on a 7 nm process. The process difference is significant: the L4 packs 35,800 million transistors into a 294 mm² die, yielding a transistor density of 121.8 million per mm². The RX 6600 LE contains 11,060 million transistors on a 237 mm² die, a density of 46.7 million per mm². The L4’s density is roughly 2.6 times higher, which explains its much larger compute capability in a similar physical footprint.

The L4 includes 7,424 shading units, 240 texture mapping units, and 80 render output units. It also has 60 ray tracing cores and 240 tensor cores. The RX 6600 LE has 1,792 shading units, 112 texture mapping units, and 64 render output units, with 28 ray tracing cores and no listed tensor cores. The L4’s shading unit count is over four times higher, and its tensor core count is unique to the NVIDIA part.

The memory architectures differ as well. The L4 uses 24 GB of GDDR6 on a 192-bit bus, delivering 300.1 GB/s bandwidth. The RX 6600 LE uses 8 GB of GDDR6 on a 128-bit bus, delivering 224.0 GB/s. The L4’s memory capacity is three times larger, and its bandwidth is 34% higher. The L4 also has a higher memory clock at 1563 MHz (12.5 Gbps effective) versus 1750 MHz (14 Gbps effective) for the RX 6600 LE, though the effective data rate is higher on the AMD part, the bus width difference gives the L4 the overall bandwidth advantage.

Specification Differences

The two GPUs differ across nearly every major specification. The L4 has a base clock of 795 MHz and a boost clock of 2040 MHz, while the RX 6600 LE has a base clock of 1626 MHz, a game clock of 2045 MHz, and a boost clock of 2495 MHz. The AMD part runs at higher clock speeds, but the L4 compensates with far more execution resources.

The L4’s FP32 throughput is 30.29 TFLOPS, and its FP16 throughput is 30.29 TFLOPS at a 1:1 ratio. The RX 6600 LE delivers 8.942 TFLOPS FP32 and 17.88 TFLOPS FP16 at a 2:1 ratio. The L4 is 3.4 times faster in FP32 and 1.7 times faster in FP16, but the RX 6600 LE’s FP16 rate is double its FP32 rate, which may suit mixed-precision workloads better if the software can use it.

The pixel rate is nearly identical: 163.2 GPixel/s for the L4 versus 159.7 GPixel/s for the RX 6600 LE. The texture rate favors the L4 substantially: 489.6 GTexel/s versus 279.4 GTexel/s. The L4 also draws less power, with a TDP of 72 W versus 132 W for the RX 6600 LE. The L4 is single-slot with no power connectors, while the RX 6600 LE is dual-slot with a single 8-pin connector. The suggested PSU is 250 W for the L4 and 300 W for the RX 6600 LE.

The L4 has no display outputs, while the RX 6600 LE has 1x HDMI 2.1 and 3x DisplayPort 1.4a. The L4 uses a PCIe 4.0 x16 interface, while the RX 6600 LE uses PCIe 4.0 x8. Dimensions differ: the L4 is 169 mm long and 56 mm high, while the RX 6600 LE is 190 mm long, 110 mm high, and 40 mm wide. The L4 released on March 20, 2023, and the RX 6600 LE released on December 7, 2023.

Head-to-Head Benchmarks

The Geekbench OpenCL test shows the L4 at 140,838 and the RX 6600 LE at 69,229. The L4 wins by 103.4%, which is the largest margin in the entire head-to-head record. This result aligns with the L4’s much higher FP32 throughput (30.29 TFLOPS versus 8.942 TFLOPS) and its larger memory pool (24 GB versus 8 GB). OpenCL workloads that scale with memory capacity and raw compute will heavily favor the L4.

The Geekbench Vulkan test shows the L4 at 121,306 and the RX 6600 LE at 72,428. The L4 wins by 67.5%. While still a clear victory, the narrower margin suggests that Vulkan workloads are less sensitive to the L4’s compute advantage, possibly because the RX 6600 LE’s higher clock speeds (boost 2495 MHz versus 2040 MHz) help close the gap in graphics-bound tasks. Still, the L4’s 4x shading unit count and 60 ray tracing cores provide a structural edge that the RX 6600 LE cannot overcome.

The L4 wins both benchmark categories, giving it a 2-0 record in the head-to-head comparison. The RX 6600 LE records zero wins. The average benchmark scores reinforce this: the L4’s 131,072 average is 85% higher than the RX 6600 LE’s 70,829. Relative to their peers, the L4 is competitive with the GeForce RTX 3090 Ti (only 0.7% behind), while the RX 6600 LE is competitive with mid-range mobile and workstation parts like the RTX A3000 Mobile (1% ahead) and the RX 6650M (1.3% behind).

The Verdict

The data is unambiguous. The NVIDIA L4 outperforms the AMD Radeon RX 6600 LE in every recorded benchmark, with a 103.4% lead in OpenCL and a 67.5% lead in Vulkan. The L4’s average benchmark score of 131,072 places it in the 95th percentile of all GPUs, while the RX 6600 LE’s 70,829 places it in the 91st percentile. The L4 is not merely faster; it is in a different performance class, sitting within 1% of the GeForce RTX 3090 Ti.

For workloads that rely on compute throughput, FP32 performance, or large memory buffers, the NVIDIA L4 is the clear pick. Its 24 GB memory, 300.1 GB/s bandwidth, and 240 tensor cores provide capabilities that the RX 6600 LE cannot match. The L4 also runs at a lower TDP (72 W versus 132 W) and requires no power connectors, making it easier to integrate into dense server environments.

For workloads that require display outputs, the RX 6600 LE is the only option of the two, as the L4 has no outputs. The RX 6600 LE also offers higher boost clocks and a dual-slot design, which may fit certain client-side or workstation setups. However, the benchmark data shows no scenario where the RX 6600 LE wins a performance test.

The verdict: choose the NVIDIA L4 for compute, server, or AI-adjacent tasks where raw performance and memory capacity are paramount. Choose the AMD Radeon RX 6600 LE only if the task requires display connectivity and the performance gap is acceptable, as the recorded benchmarks offer no evidence of a workload where the RX 6600 LE surpasses the L4.