AMD Radeon RX 6500M vs AMD Radeon RX 7800 XT Comparison

Where Each One Wins

The benchmark split between the AMD Radeon RX 7800 XT and the AMD Radeon RX 6500M is decisively one-sided, but the single exception is revealing. The RX 7800 XT takes 8 of 9 head-to-head tests, while the RX 6500M claims only one victory—in Geekbench OpenCL, where it scores 38,586 against the RX 7800 XT's 18,290, a 52.6% margin in the mobile card's favor. That result is anomalous; every other compute-oriented test swings heavily toward the desktop part.

For gaming workloads, the RX 7800 XT is the clear choice. In Passmark's DirectX 11 test, it scores 249 versus 70, a 255.7% lead. DirectX 9 shows 304 against 92, a 230.4% advantage. DirectX 12 delivers 93 versus 34, a 173.5% gap. Even the older DirectX 10 path shows 121 versus 52, a 132.7% difference. The RX 7800 XT also dominates in the general 3D workload, posting 24,176 in Passmark G3D against 7,531, a 221% lead.

Compute performance outside of OpenCL tells the same story. Passmark GPU Compute scores 13,473 for the RX 7800 XT versus 2,669 for the RX 6500M, a 404.8% margin—the largest delta in the entire comparison. The 2D graphics test also favors the desktop card heavily: 1,177 versus 385, a 205.7% difference.

The RX 6500M's OpenCL win is worth examining. In Geekbench Vulkan, the RX 7800 XT takes back the lead with 54,228 versus 43,837, a 23.7% advantage. So the mobile part's OpenCL superiority does not extend to the Vulkan API, where the desktop card's architectural advantages reassert themselves.

Architecture Differences

The two GPUs come from different generations and process nodes. The RX 7800 XT uses the Navi 32 chip on RDNA 3.0 architecture, built on TSMC's 5 nm process. It packs 28,100 million transistors into a 346 mm² die, yielding a transistor density of 81.2M per mm². The RX 6500M uses the Navi 24 chip on RDNA 2.0, fabricated on TSMC's 6 nm node, with 5,400 million transistors on a 107 mm² die—a density of 50.5M per mm².

The compute unit counts differ dramatically. The RX 7800 XT has 3,840 shading units, 240 texture mapping units, 96 raster operations units, and 60 ray tracing cores. The RX 6500M has 1,024 shading units, 64 TMUs, 32 ROPs, and 16 RT cores. That is a 3.75x difference in shading units and TMUs, and a 3x difference in ROPs and RT cores.

Memory configurations are equally divergent. The RX 7800 XT carries 16 GB of GDDR6 on a 256-bit bus, achieving 624.1 GB/s of bandwidth. The RX 6500M has 4 GB of GDDR6 on a 64-bit bus, with 144.0 GB/s. The desktop card offers four times the capacity and over four times the bandwidth.

Clock behavior also differs. The RX 7800 XT has a base clock of 1295 MHz, a boost of 2430 MHz, and a game clock of 2124 MHz. The RX 6500M starts higher at 2000 MHz base, boosts to 2400 MHz, and games at 2191 MHz. Despite the mobile card's higher base clock, the desktop part's massive compute resource advantage dominates.

The RX 7800 XT is a dual-slot desktop card requiring 2x 8-pin power connectors and a 600 W suggested PSU, with a 263 W TDP. The RX 6500M is an IGP (integrated graphics processor) with no power connectors and a 50 W TDP, designed for portable devices. The RX 7800 XT uses PCIe 4.0 x16, while the RX 6500M uses PCIe 4.0 x4.

FAQ

Q: Why does the RX 6500M win in Geekbench OpenCL despite losing everywhere else?

A: The RX 6500M scores 38,586 in Geekbench OpenCL versus the RX 7800 XT's 18,290, a 52.6% advantage. However, the RX 7800 XT wins Geekbench Vulkan with 54,228 against 43,837. The OpenCL result is an outlier that does not reflect overall compute performance, as the RX 7800 XT leads Passmark GPU Compute by 404.8%.

Q: Which card has better memory bandwidth?

A: The RX 7800 XT has 624.1 GB/s of bandwidth from 16 GB of GDDR6 on a 256-bit bus. The RX 6500M has 144.0 GB/s from 4 GB of GDDR6 on a 64-bit bus. The desktop card's bandwidth is roughly 4.3 times higher.

Q: Are these cards from the same architecture generation?

A: No. The RX 7800 XT uses RDNA 3.0 on a 5 nm process, while the RX 6500M uses RDNA 2.0 on a 6 nm process. The RX 7800 XT is from the Radeon RX 7000 series (Navi III generation), and the RX 6500M is from the Radeon RX 6000 series (Navi Mobile generation).

Q: What is the power consumption difference?

A: The RX 7800 XT has a 263 W TDP and requires a 600 W suggested PSU. The RX 6500M has a 50 W TDP and no power connectors. The desktop card consumes over five times the power of the mobile part.

Q: How do these cards compare in ray tracing hardware?

A: The RX 7800 XT has 60 ray tracing cores, while the RX 6500M has 16. This is a 3.75x difference in dedicated RT hardware, which aligns with the overall compute resource disparity.

Q: Which card supports newer APIs?

A: Both cards support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. There is no API-level difference between the two.

Specification Differences

| Specification | AMD Radeon RX 7800 XT | AMD Radeon RX 6500M |

|---|---|---|

| Architecture | RDNA 3.0 | RDNA 2.0 |

| Process Node | 5 nm | 6 nm |

| Transistors | 28,100 million | 5,400 million |

| Die Size | 346 mm² | 107 mm² |

| Transistor Density | 81.2M / mm² | 50.5M / mm² |

| Base Clock | 1295 MHz | 2000 MHz |

| Boost Clock | 2430 MHz | 2400 MHz |

| Game Clock | 2124 MHz | 2191 MHz |

| Memory Size | 16 GB | 4 GB |

| Memory Bus Width | 256 bit | 64 bit |

| Memory Bandwidth | 624.1 GB/s | 144.0 GB/s |

| Shading Units | 3840 | 1024 |

| TMUs | 240 | 64 |

| ROPs | 96 | 32 |

| RT Cores | 60 | 16 |

| Pixel Rate | 233.3 GPixel/s | 76.80 GPixel/s |

| Texture Rate | 583.2 GTexel/s | 153.6 GTexel/s |

| FP32 | 37.32 TFLOPS | 4.915 TFLOPS |

| FP16 | 37.32 TFLOPS (1:1) | 9.830 TFLOPS (2:1) |

| TDP | 263 W | 50 W |

| Slot Width | Dual-slot | IGP |

| Power Connectors | 2x 8-pin | None |

| Suggested PSU | 600 W | None |

| Bus Interface | PCIe 4.0 x16 | PCIe 4.0 x4 |

| Display Outputs | 1x HDMI 2.1a, 3x DisplayPort 2.1 | Portable Device Dependent |

| Production Status | Active | End-of-life |

| Release Date | 2023-09-05 | 2022-01-03 |

| Launch MSRP | 499 USD | None |

Head-to-Head Benchmarks

The largest single victory for the RX 7800 XT comes in Passmark GPU Compute, where it scores 13,473 versus 2,669—a 404.8% advantage. This is the clearest indicator of raw compute throughput, and the margin reflects the desktop card's 7.6x higher FP32 throughput (37.32 TFLOPS versus 4.915 TFLOPS).

In DirectX 11, the RX 7800 XT posts 249 against 70, a 255.7% lead. The desktop card's pixel rate of 233.3 GPixel/s versus 76.80 GPixel/s and texture rate of 583.2 GTexel/s versus 153.6 GTexel/s explain the dominance in rasterization-heavy workloads.

DirectX 9 shows a 230.4% gap (304 versus 92), while DirectX 12 shows 173.5% (93 versus 34). The smaller DirectX 12 delta—though still massive—might reflect the RX 6500M's higher base clock relative to its compute resources, or API-level optimizations in the newer path.

Passmark G3D gives the RX 7800 XT 24,176 versus 7,531, a 221% lead. The 2D test shows 1,177 versus 385, a 205.7% gap. Geekbench Vulkan shows the closest desktop victory: 54,228 versus 43,837, a 23.7% lead. DirectX 10 is the smallest percentage win at 132.7% (121 versus 52).

The RX 6500M's only win, Geekbench OpenCL at 38,586 versus 18,290, is a 52.6% margin in its favor. This is the sole benchmark where the mobile card's higher base clock (2000 MHz versus 1295 MHz) and game clock (2191 MHz versus 2124 MHz) appear to translate into a real advantage, possibly due to workload characteristics in OpenCL that favor the RDNA 2.0 design.

The Verdict

The data indicates two cards serving entirely different purposes. The AMD Radeon RX 7800 XT is a desktop-class GPU with 16 GB of memory, a 256-bit bus, and 3,840 shading units. It wins 8 of 9 head-to-head benchmarks and dominates in every gaming API tested. Its Passmark G3D score of 24,176 places it in the 51st percentile of all GPUs, with an average benchmark score of 11,627. Its nearest rivals include the NVIDIA GeForce GTX 1660 (delta -0.5%) and AMD Radeon RX 6500 XT (delta -1.8%).

The AMD Radeon RX 6500M is an end-of-life mobile IGP with 4 GB of memory and a 64-bit bus. Its 1,024 shading units and 50 W TDP make it a low-power part for portable devices. Its average benchmark score is 10,362, placing it in the 48th percentile. Its nearest rivals include the NVIDIA Tesla C2075 (delta -0.4%) and AMD Radeon RX 550X (delta -1.1%).

Choose the RX 7800 XT for any workload involving DirectX gaming, Vulkan, or general 3D compute. Its 404.8% lead in GPU compute and 221% lead in G3D make it the only rational choice for desktop performance. Choose the RX 6500M only if you need the OpenCL-specific performance edge it demonstrates, or if the 50 W power envelope and integrated form factor are absolute requirements. The RX 7800 XT's 263 W TDP and dual-slot footprint are not comparable to the RX 6500M's mobile design.

The verdict from the data is clear: the RX 7800 XT is a high-performance desktop part, while the RX 6500M is a low-power mobile solution. Their benchmark results are not close, except for the single OpenCL anomaly. The RX 7800 XT's 3.75x shading unit advantage, 4.3x bandwidth advantage, and 7.6x FP32 throughput advantage produce outcomes that are decisive across nearly every test.