AMD Radeon Instinct MI60 vs AMD Radeon RX 6650M XT Comparison

The AMD Radeon Instinct MI60 and the AMD Radeon RX 6650M XT represent two completely different design philosophies from the same manufacturer, and the benchmark data reflects that divergence clearly. The MI60 is a data-center workhorse built for compute throughput, while the RX 6650M XT is a mobile gaming part engineered for efficiency within a tight power envelope. Across the single available head-to-head benchmark, the MI60 dominates, but the story is far more nuanced when considering the architectures, target use cases, and the specific strengths each chip brings to the table.

Head-to-Head Benchmarks

The only direct benchmark comparison available is the Geekbench OpenCL test, and it is a decisive victory for the MI60. The Instinct MI60 scores 92,488 points, while the RX 6650M XT manages 76,904 points. That is a 20.3% advantage for the MI60, a substantial margin that underscores its compute-oriented design. This result aligns with the MI60’s position in the broader GPU landscape, where it sits at the 93rd percentile of all GPUs, while the RX 6650M XT trails slightly at the 91st percentile.

Looking at the MI60’s nearest rivals provides context for that score. The MI60 is just 0.9% ahead of the NVIDIA RTX A4500 (91,671 points) and 1.5% ahead of the RTX A4500 Mobile (91,134 points). It falls behind the AMD Radeon Pro VII by 4.8% and the RX 7900M by 5.2%. These deltas show that the MI60 is competitive with high-end workstation and mobile parts, even if it is not the absolute top performer in its immediate neighborhood. The 20.3% gap over the RX 665M XT is therefore not just a win; it places the MI60 in a different performance tier entirely.

For the RX 6650M XT, its 76,904 OpenCL score is close to the NVIDIA GeForce RTX 5090 D, which scores 77,712 points, a 1% deficit for the AMD mobile part. It is also 2.6% behind the AMD Radeon RX 6850M XT (78,940 points) and 3.1% behind the NVIDIA Tesla P100 PCIe 12 GB (79,396 points). These are tight margins, suggesting that the RX 6650M XT is a solid mid-to-high-range mobile performer, but it is not designed to compete with dedicated compute accelerators like the MI60. The benchmark data shows a clear hierarchy: the MI60 is a compute specialist, while the RX 6650M XT is a generalist mobile GPU that holds its own against other mobile and older workstation parts.

The Verdict

The data points to a simple conclusion: the AMD Radeon Instinct MI60 is the clear winner in raw computational throughput, and it is the only rational choice for workloads that prioritize OpenCL performance. Its 20.3% lead over the RX 6650M XT in the sole head-to-head test is not a marginal difference; it is a decisive margin that reflects the MI60’s purpose-built nature. With 32 GB of HBM2 memory and a 4096-bit bus, the MI60 is engineered for large datasets and memory-bandwidth-intensive tasks, a fact that is evidenced by its 1.02 TB/s bandwidth. The RX 6650M XT, with its 8 GB GDDR6 memory and 128-bit bus, simply cannot match that capacity or throughput.

However, the verdict is not universally in favor of the MI60. The RX 6650M XT is a mobile part, which means it is designed for a completely different physical and thermal environment. The MI60 is a dual-slot card with a 300 W TDP and requires a 700 W power supply, while the RX 6650M XT is an IGP (integrated graphics processor) with a 120 W TDP and no power connectors. The RX 6650M XT is meant to be soldered onto a motherboard in a laptop, while the MI60 is a discrete card for a server chassis. If the use case is a portable gaming system, the RX 6650M XT is the only viable choice, despite its lower benchmark scores. The data shows that the MI60 wins on performance, but the RX 6650M XT wins on practicality for mobile scenarios.

Architecture Differences

The architectural divide between these two GPUs is fundamental. The MI60 utilizes the Vega 20 chip, built on the GCN 5.1 architecture, which is a mature design focused on raw compute throughput. It employs 13,230 million transistors on a 331 mm² die, fabricated on a 7 nm process at TSMC. The RX 6650M XT, in contrast, uses the Navi 23 chip, based on the RDNA 2.0 architecture, which is a newer gaming-first design. It has 11,060 million transistors on a smaller 237 mm² die, also using a 7 nm TSMC process. The transistor density tells the story: the RX 6650M XT packs 46.7 million transistors per mm², while the MI60 has 40.0 million per mm². This indicates that RDNA 2.0 is a more compact and efficient design, allowing for higher clock speeds and better performance per watt.

The differences extend to core counts and features. The MI60 has 4,096 shading units, 256 TMUs, and 64 ROPs, but it has no ray tracing cores. The RX 6650M XT has half the shading units (2,048), half the TMUs (128), and the same number of ROPs (64), but it adds 32 ray tracing cores. This is a clear sign of their different purposes: the MI60 is a pure compute engine, while the RX 6650M XT is equipped for modern gaming with hardware-accelerated ray tracing. The MI60 also supports DirectX 12 (12_1) and Vulkan 1.3, while the RX 6650M XT supports DirectX 12 Ultimate (12_2) and Vulkan 1.4, reflecting the newer feature set of the RDNA 2.0 architecture.

Specification Differences

The specification sheets highlight stark contrasts in nearly every category. The MI60 has a base clock of 1200 MHz and a boost clock of 1800 MHz, while the RX 6650M XT runs significantly faster with a base clock of 2068 MHz, a game clock of 2162 MHz, and a boost clock of 2416 MHz. The higher clocks on the RX 6650M XT are a direct result of the more efficient RDNA 2.0 architecture, which allows it to achieve higher frequencies within a lower power budget. The MI60’s memory clock is listed as 1000 MHz with 2 Gbps effective, whereas the RX 6650M XT has a 2000 MHz memory clock with 16 Gbps effective.

Memory configuration is another major differentiator. The MI60 offers 32 GB of HBM2 memory on a 4096-bit bus, yielding 1.02 TB/s of bandwidth. The RX 6650M XT offers 8 GB of GDDR6 memory on a 128-bit bus, yielding 256.0 GB/s. This is a 4x difference in capacity and a 4x difference in bandwidth, which explains the MI60’s dominance in memory-intensive tasks. The pixel rates also differ, with the RX 6650M XT achieving 154.6 GPixel/s compared to the MI60’s 115.2 GPixel/s, and the texture rates favor the MI60 at 460.8 GTexel/s versus the RX 6650M XT’s 309.2 GTexel/s. The FP32 performance is 14.75 TFLOPS for the MI60 and 9.896 TFLOPS for the RX 6650M XT, with FP16 performance at 29.49 TFLOPS and 19.79 TFLOPS respectively.

Physical specifications are equally divergent. The MI60 is a dual-slot card, 267 mm in length and 111 mm in height, with 1x 6-pin and 1x 8-pin power connectors and a 300 W TDP. The RX 6650M XT is an IGP with no dimensions listed, no power connectors, and a 120 W TDP. The MI60 uses a PCIe 4.0 x16 interface and has 1x mini-DisplayPort 1.4a output, while the RX 6650M XT uses a PCIe 4.0 x8 interface and its display outputs are portable-device dependent. The MI60 was released in November 2018, while the RX 6650M XT arrived in January 2022, and both are now end-of-life products.

FAQ

Q: Which GPU has higher raw compute performance in OpenCL?

A: The AMD Radeon Instinct MI60 is decisively ahead, scoring 92,488 points in Geekbench OpenCL compared to 76,904 points for the AMD Radeon RX 6650M XT, a 20.3% advantage.

Q: Does the RX 6650M XT support ray tracing, and does the MI60?

A: Yes, the RX 6650M XT has 32 ray tracing cores, while the MI60 has no ray tracing cores at all. This makes the RX 6650M XT suitable for modern gaming features that the MI60 cannot handle.

Q: How do their memory capacities and bandwidths compare?

A: The MI60 has 32 GB of HBM2 memory with a 4096-bit bus and 1.02 TB/s bandwidth. The RX 6650M XT has 8 GB of GDDR6 memory with a 128-bit bus and 256.0 GB/s bandwidth.

Q: What are the TDPs of these two GPUs?

A: The MI60 has a 300 W TDP and requires a 700 W power supply, while the RX 6650M XT has a 120 W TDP and no power connectors, as it is an IGP.

Q: Which GPU is positioned higher in the overall performance percentile?

A: The MI60 is at the 93rd percentile of all GPUs, while the RX 6650M XT is at the 91st percentile, indicating the MI60 is the higher-performing part overall.

Q: What are the release dates for these products?

A: The MI60 was released on November 17, 2018, and the RX 6650M XT was released on January 3, 2022. Both are now end-of-life products.