AMD Radeon RX 6600 LE vs AMD Radeon RX 6650M XT Comparison

The AMD Radeon RX 6650M XT and the AMD Radeon RX 6600 LE are both RDNA 2.0 parts built on the same Navi 23 chip, but they are configured for very different environments. The data shows a clear performance leader in the 6650M XT, yet the 6600 LE counters with its own set of practical advantages that matter depending on your build priorities. The benchmark scores indicate a tight race at the top of the 93rd percentile, but the underlying specifications reveal distinct personalities.

Where Each One Wins

The AMD Radeon RX 6650M XT is the outright performance winner in the only head-to-head benchmark available. In the Geekbench OpenCL test, it scores 76,768 points against the 6600 LE’s 72,784, a 5.5% delta. This advantage is rooted in its more generous compute configuration. The 6650M XT packs 2,048 shading units, 128 texture mapping units, and 32 ray accelerators, compared to the 6600 LE’s 1,792 shading units, 112 TMUs, and 28 ray accelerators. That translates to a higher FP32 throughput of 9.896 TFLOPS versus 8.942 TFLOPS for the 6600 LE. For raw number-crunching and compute-heavy workloads, the 6650M XT is the clear choice.

Where the AMD Radeon RX 6600 LE wins is in the field of practicality and sustained operation. While it is slower in raw performance, it is an active, dual-slot product with a discrete power connector. The 6600 LE carries a 1x 8-pin power connector and a 300 W suggested PSU, whereas the 6650M XT is an IGP (integrated graphics processor) with no power connectors, relying entirely on the host system’s power delivery. The 6600 LE also has a defined physical footprint at 190 mm in length, 110 mm in height, and 40 mm in width, making it a standard drop-in card. The 6650M XT has no dimensions listed, reflecting its mobile-oriented, board-integrated nature for laptops or proprietary systems.

Memory bandwidth is another point of divergence. The 6650M XT uses 2000 MHz memory with 16 Gbps effective speed, yielding 256.0 GB/s of bandwidth. The 6600 LE runs its memory at 1750 MHz with 14 Gbps effective speed, resulting in 224.0 GB/s. The 6650M XT’s higher bandwidth helps feed its larger shader array, contributing to its benchmark lead. However, the 6600 LE compensates with a higher boost clock of 2495 MHz versus the 6650M XT’s 2416 MHz, though its base clock is lower at 1626 MHz versus 2068 MHz.

The Verdict

The verdict is straightforward for raw compute performance: the AMD Radeon RX 6650M XT wins. The data shows it is 3.2% faster than the 6600 LE based on average benchmark scores, and 5.5% faster in the direct OpenCL comparison. Its nearest rival list confirms its standing, sitting just 2.1% behind the AMD Radeon Pro Vega 64 and 4.3% ahead of the AMD Radeon Vega Frontier Edition. If you are building a system where maximum FP32 throughput and memory bandwidth are the sole criteria, the 6650M XT is the better silicon.

The AMD Radeon RX 6600 LE is the better choice when you need a standard, self-contained graphics card. It is an active product with a dual-slot cooler, a dedicated 8-pin power input, and a suggested PSU rating, making it suitable for a typical desktop build. Its 132 W TDP is slightly higher than the 6650M XT’s 120 W, but that is the cost of having its own power delivery and cooling solution. The 6600 LE also shows versatility in its benchmark results, posting a Geekbench Vulkan score of 76,001 alongside its OpenCL score, whereas the 6650M XT only has an OpenCL result. For a practical, install-and-go desktop card, the 6600 LE is the more sensible pick, accepting a 5.5% performance deficit in exchange for a standard form factor.

Head-to-Head Benchmarks

The only direct comparison available is the Geekbench OpenCL test, and it decisively favors the 6650M XT. The 6650M XT scores 76,768 points, while the 6600 LE scores 72,784 points. That is a 5.5% advantage for the 6650M XT, which aligns with its higher core counts and memory bandwidth. The 6650M XT’s 256.0 GB/s bandwidth versus the 6600 LE’s 224.0 GB/s is a 14.3% raw advantage in memory throughput, helping to keep its 2048 shading units fed.

Looking at the broader rival context, the 6650M XT’s average score of 76,768 places it 4.3% ahead of the AMD Radeon Vega Frontier Edition and 2.1% ahead of the AMD Radeon Pro Vega 64. The 6600 LE’s average score of 74,393 puts it 1.1% ahead of the same Vega Frontier Edition but 1.1% behind the Pro Vega 64. The 6600 LE also edges out the AMD Radeon RX 6650M by 2.9%, showing it is no slouch despite trailing the 6650M XT. The 6650M XT’s win count of 1 versus the 6600 LE’s 0 in head-to-head tests confirms its dominance in this metric.

FAQ

Q: Which GPU is faster in OpenCL benchmarks?

A: The AMD Radeon RX 6650M XT is faster, scoring 76,768 points in Geekbench OpenCL compared to the 6600 LE’s 72,784, a 5.5% difference.

Q: Do both cards have the same amount of memory?

A: Yes, both the RX 6650M XT and RX 6600 LE feature 8 GB of GDDR6 memory on a 128-bit bus.

Q: Is the RX 6600 LE suitable for a standard desktop PC?

A: Yes, the RX 6600 LE is an active dual-slot card with a 1x 8-pin power connector, a 300 W suggested PSU, and defined dimensions of 190 mm in length, 110 mm in height, and 40 mm in width. The RX 6650M XT is an IGP with no power connectors.

Q: How does the RX 6650M XT compare to the RX 6600 LE in terms of average benchmark score?

A: The RX 6650M XT has an average benchmark score of 76,768, which is 3.2% higher than the RX 6600 LE’s 74,393.

Q: Which GPU has a higher memory bandwidth?

A: The RX 6650M XT has higher memory bandwidth at 256.0 GB/s, while the RX 6600 LE offers 224.0 GB/s.

Q: What is the performance difference between the RX 6600 LE and the RX 6650M?

A: The RX 6600 LE scores 2.9% higher than the AMD Radeon RX 6650M, according to the nearest rivals data.

Architecture Differences

Both GPUs are built on the same Navi 23 chip, using the RDNA 2.0 architecture and a 7 nm TSMC process. They share the same transistor count of 11,060 million and a die size of 237 mm², yielding an identical transistor density of 46.7M per mm². The fundamental architecture is the same, but the execution configurations differ significantly.

The RX 6650M XT is a more fully-featured Navi 23 die. It has 2,048 shading units, 128 TMUs, and 32 ray accelerators. The RX 6600 LE is a cut-down version, with 1,792 shading units, 112 TMUs, and 28 ray accelerators. Both have 64 ROPs. This difference in core counts directly explains the performance gap. The 6650M XT’s FP32 compute is 9.896 TFLOPS, while the 6600 LE manages 8.942 TFLOPS. FP16 performance scales accordingly, with the 6650M XT at 19.79 TFLOPS (2:1) and the 6600 LE at 17.88 TFLOPS (2:1).

The memory subsystem also differs. The 6650M XT runs its GDDR6 memory at 2000 MHz (16 Gbps effective), achieving 256.0 GB/s. The 6600 LE uses slower 1750 MHz memory (14 Gbps effective), for 224.0 GB/s. Both use a 128-bit memory bus. In terms of API support, both are identical, supporting DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Specification Differences

The two cards differ across several key specification fields, starting with their generation and release status. The RX 6650M XT belongs to the Navi Mobile (RX 6000M) generation and was released on 2022-01-03, with a production status of End-of-life. The RX 6600 LE belongs to the Navi II (RX 6000) generation, released on 2023-12-07, and is currently Active in production.

Clock speeds tell a story of different tuning strategies. The RX 6650M XT has a base clock of 2068 MHz, a boost clock of 2416 MHz, and a game clock of 2162 MHz. The RX 6600 LE has a lower base clock of 1626 MHz and a lower game clock of 2045 MHz, but a higher boost clock of 2495 MHz. This suggests the 6600 LE is tuned to run cooler at idle or low load, but can spike higher under boost conditions.

Power and physical design are major differentiators. The RX 6650M XT has a TDP of 120 W, is an IGP with no power connectors, and has a slot width listed as IGP. Its display outputs are listed as "Portable Device Dependent," indicating its mobile focus. The RX 6600 LE has a higher TDP of 132 W, is a dual-slot card with a 1x 8-pin power connector, and a suggested PSU of 300 W. It offers standard display outputs of 1x HDMI 2.1 and 3x DisplayPort 1.4a. The 6600 LE has physical dimensions of 190 mm x 110 mm x 40 mm, while the 6650M XT has no listed dimensions.

The benchmark portfolios also differ. The RX 6650M XT has a single Geekbench OpenCL score of 76,768. The RX 6600 LE has both a Geekbench OpenCL score of 72,784 and a Geekbench Vulkan score of 76,001. This gives the 6600 LE a broader software compatibility profile in the data. Finally, the bus interface is identical for both: PCIe 4.0 x8.