AMD Radeon RX 6650M XT vs NVIDIA PG506-232 Comparison

Head-to-Head Benchmarks

The recorded benchmark data shows a decisive outcome in the only head-to-head comparison available. In the Geekbench OpenCL test, the NVIDIA PG506-232 scores 225,124, while the AMD Radeon RX 6650M XT scores 76,904. This gives the NVIDIA part a 192.7% advantage, a margin so large that it defines the entire comparison.

To put that into perspective, the PG506-232 sits at the 99th percentile among all GPUs in the database. Its nearest rivals are all professional or workstation class parts: the AMD Radeon PRO W7900D trails by 2.4%, the NVIDIA A100 PCIe 80 GB trails by 8.7%, and the NVIDIA RTX 6000D trails by 14.9%. The only listed competitor that beats it is the NVIDIA L20, which leads by 10.4%. The PG506-232 is therefore not merely fast for its class; it is positioned among the top compute accelerators in the entire database.

The RX 6650M XT, by contrast, sits at the 91st percentile. Its nearest rivals are a mix of mobile gaming parts and older data center accelerators. The NVIDIA GeForce RTX 5090 D is essentially level, trailing by only 1%. The AMD Radeon RX 6850M XT trails by 2.6%, the NVIDIA Tesla P100 PCIe 12 GB trails by 3.1%, and the NVIDIA Tesla P100 PCIe 16 GB trails by 3.4%. The RX 6650M XT is competitive within its own peer group, but that peer group operates on a completely different performance plane than the PG506-232.

The benchmark delta between the two cards is not a close contest. The PG506-232 delivers nearly three times the raw OpenCL score of the RX 6650M XT. This is not a case where architectural trade-offs make one card better in some scenarios and the other in others; the single recorded test shows a total sweep for the NVIDIA part, with 1 win for the PG506-232 and 0 wins for the RX 6650M XT.

The Verdict

The data points to a clear conclusion: the NVIDIA PG506-232 is the superior compute device by a massive margin. Its OpenCL score of 225,124 is 192.7% higher than the RX 6650M XT's 76,904. For any workload that relies on general-purpose GPU compute as measured by OpenCL, the PG506-232 is the obvious choice.

However, the verdict is not simply "NVIDIA wins." The two cards serve fundamentally different markets. The PG506-232 is a dual-slot server accelerator with no display outputs, designed for compute environments. The RX 6650M XT is a mobile part, classified as an IGP (integrated graphics processor) with outputs described as "Portable Device Dependent." It is built for laptops and portable systems. A user choosing between these two is not choosing between two desktop graphics cards; they are choosing between a rack-mounted compute accelerator and a mobile GPU.

From a pure performance standpoint, the PG506-232 is the pick for anyone who needs maximum OpenCL throughput and has the infrastructure to house a dual-slot, 267 mm card that requires an 8-pin EPS power connector and a 450 W suggested power supply. The RX 6650M XT is the pick for a portable system where power draw matters, as its 120 W TDP is lower than the PG506-232's 165 W, and where the absence of a dedicated power connector is an advantage.

That said, the benchmark gap is so large that no workload in the recorded data favors the AMD part. The RX 6650M XT's only advantages are physical and practical, not computational. For raw compute, the verdict is unambiguous: the PG506-232 wins every measured test.

Architecture Differences

The two GPUs come from entirely different architectural lineages. The NVIDIA PG506-232 is built on the GA100 chip using the Ampere architecture, designed for server and data center workloads. The AMD Radeon RX 6650M XT uses the Navi 23 chip with the RDNA 2.0 architecture, aimed at mobile gaming and portable graphics.

Both are manufactured on a 7 nm process at TSMC, so the process node is identical. The similarity ends there. The PG506-232 packs 54,200 million transistors on an 826 mm² die, giving a transistor density of 65.6 million transistors per mm². The RX 6650M XT has 11,060 million transistors on a 237 mm² die, with a density of 46.7 million per mm². The PG506-232 is a much larger, denser chip by every measure.

Memory architecture is another major divergence. The PG506-232 uses 24 GB of HBM2 on a 3072-bit bus, delivering 933.1 GB/s of bandwidth. The RX 6650M XT uses 8 GB of GDDR6 on a 128-bit bus, delivering 256.0 GB/s. The NVIDIA part has 3 times the memory capacity and roughly 3.6 times the bandwidth. For memory-bound compute workloads, this is a decisive difference.

Compute resources also differ sharply. The PG506-232 has 3,584 shading units, 224 texture mapping units, and 96 ROPs. It also includes 224 tensor cores, which the AMD part lacks entirely. The RX 6650M XT has 2,048 shading units, 128 TMUs, and 64 ROPs. It does include 32 ray tracing cores, a feature the PG506-232 does not list. This reflects their different design goals: the PG506-232 is optimized for AI and compute acceleration, while the RX 6650M XT includes hardware for real-time ray tracing in gaming workloads.

The PG506-232 has no listed API support for DirectX, OpenGL, or Vulkan, consistent with its server role. The RX 6650M XT supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, making it a fully featured graphics card for consumer software.

Specification Differences

The specification sheets reveal two devices with almost no overlap outside the manufacturing process.

• Architecture: PG506-232 is Ampere; RX 6650M XT is RDNA 2.0.
• Chip: GA100 vs Navi 23.
• Transistors: 54,200 million vs 11,060 million.
• Die size: 826 mm² vs 237 mm².
• Transistor density: 65.6M / mm² vs 46.7M / mm².
• Base clock: 930 MHz vs 2068 MHz.
• Boost clock: 1440 MHz vs 2416 MHz.
• Game clock: not applicable vs 2162 MHz.
• Memory clock: 1215 MHz (2.4 Gbps effective) vs 2000 MHz (16 Gbps effective).
• Memory size: 24 GB vs 8 GB.
• Memory type: HBM2 vs GDDR6.
• Memory bus: 3072 bit vs 128 bit.
• Memory bandwidth: 933.1 GB/s vs 256.0 GB/s.
• Shading units: 3584 vs 2048.
• TMUs: 224 vs 128.
• ROPs: 96 vs 64.
• Tensor cores: 224 vs none.
• Ray tracing cores: none vs 32.
• Pixel rate: 138.2 GPixel/s vs 154.6 GPixel/s.
• Texture rate: 322.6 GTexel/s vs 309.2 GTexel/s.
• FP32 performance: 10.32 TFLOPS vs 9.896 TFLOPS.
• FP16 performance: 10.32 TFLOPS (1:1) vs 19.79 TFLOPS (2:1).
• TDP: 165 W vs 120 W.
• Slot width: Dual-slot vs IGP.
• Power connectors: 8-pin EPS vs none.
• Suggested PSU: 450 W vs none listed.
• Bus interface: PCIe 4.0 x16 vs PCIe 4.0 x8.
• Display outputs: no outputs vs portable device dependent.
• Release date: 2021-04-11 vs 2022-01-03.

Notably, the RX 6650M XT has a higher pixel rate (154.6 GPixel/s vs 138.2 GPixel/s) and a much higher FP16 rate (19.79 TFLOPS vs 10.32 TFLOPS), thanks to its 2:1 FP16 ratio. The PG506-232 counters with a higher FP32 rate and a texture rate advantage. The NVIDIA card also has a wider bus interface (PCIe 4.0 x16 vs x8), which matters for data transfer in server environments.

FAQ

Q: Which GPU has the higher OpenCL benchmark score?

A: The NVIDIA PG506-232 scores 225,124 in Geekbench OpenCL, compared to 76,904 for the AMD Radeon RX 6650M XT, a 192.7% difference.

Q: Do the two GPUs use the same manufacturing process?

A: Yes, both are built on a 7 nm process at TSMC. However, the PG506-232 has 54,200 million transistors on an 826 mm² die, while the RX 6650M XT has 11,060 million transistors on a 237 mm² die.

Q: Which card has more memory bandwidth?

A: The PG506-232 has 933.1 GB/s of bandwidth using 24 GB of HBM2 on a 3072-bit bus. The RX 6650M XT has 256.0 GB/s using 8 GB of GDDR6 on a 128-bit bus.

Q: Does the AMD card support ray tracing?

A: Yes, the RX 6650M XT includes 32 ray tracing cores. The PG506-232 does not list any ray tracing cores, as it is a compute-focused server accelerator.

Q: Which GPU has tensor cores?

A: The PG506-232 has 224 tensor cores. The RX 6650M XT has no tensor cores, as it is built on the RDNA 2.0 gaming architecture.

Q: What is the power requirement difference?

A: The PG506-232 has a 165 W TDP and requires an 8-pin EPS power connector with a 450 W suggested power supply. The RX 6650M XT has a 120 W TDP and lists no power connectors or PSU requirement, consistent with its mobile IGP design.

Where Each One Wins

The NVIDIA PG506-232 wins in every measured compute benchmark. Its OpenCL score of 225,124 places it at the 99th percentile of all GPUs, and it leads the RX 6650M XT by 192.7%. It also wins decisively in memory capacity (24 GB vs 8 GB), memory bandwidth (933.1 GB/s vs 256.0 GB/s), and FP32 throughput (10.32 TFLOPS vs 9.896 TFLOPS). For server compute, AI acceleration, or any workload that stresses memory bandwidth and raw FP32 performance, the PG506-232 is the clear winner.

The RX 6650M XT wins in areas that do not appear in the head-to-head benchmark but are relevant to its use case. It has a higher boost clock (2416 MHz vs 1440 MHz), a higher pixel rate (154.6 GPixel/s vs 138.2 GPixel/s), and a substantially higher FP16 rate (19.79 TFLOPS vs 10.32 TFLOPS) thanks to its 2:1 FP16 execution. It also supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the PG506-232 lists no consumer API support. It includes 32 ray tracing cores, making it suitable for gaming workloads, and its 120 W TDP is lower than the PG506-232's 165 W, which matters in portable systems. It also requires no external power connector and no dedicated PSU suggestion, making integration into laptops far simpler.

The practical split is straightforward: the PG506-232 is for fixed, high-throughput compute installations where its dual-slot size, 267 mm length, and 8-pin EPS power requirement are acceptable. The RX 6650M XT is for mobile or compact systems where power efficiency, API compatibility, and ray tracing support are priorities. On raw compute performance, however, the PG506-232 wins every recorded test without exception.