AMD Radeon Pro Vega II vs AMD Radeon RX 6850M XT Comparison

AMD Radeon Pro Vega II and AMD Radeon RX 6850M XT represent two very different interpretations of AMD graphics hardware. The Pro Vega II is a workstation-class, quad-slot behemoth from 2019, built on the older GCN 5.1 architecture and designed for Apple Mac Pro systems. The RX 6850M XT is a mobile-first RDNA 2.0 part from 2022, intended for high-end gaming laptops. The benchmark data shows a surprisingly close contest in some areas but a decisive victory for the Pro Vega II in overall compute throughput.

Head-to-Head Benchmarks

The database records three direct head-to-head benchmark comparisons between these two GPUs, all using Geekbench workloads. The AMD Radeon Pro Vega II wins all three, but the margins tell a compelling story.

In Geekbench Metal, the Pro Vega II scores 130,183 against the RX 6850M XT's 128,981. That is a razor-thin 0.9% advantage. For a card with nearly double the shading units (4096 vs 2560) and more than twice the memory bandwidth (825.3 GB/s vs 432.0 GB/s), such a small gap in Metal suggests the RDNA 2.0 architecture in the mobile part is exceptionally efficient at extracting performance per unit of compute. The RX 6850M XT's higher clock speeds, with a boost of 2581 MHz versus 1720 MHz, clearly help close the raw hardware gap.

The OpenCL result is where the Pro Vega II pulls ahead decisively. It scores 99,048 versus 85,040, a 16.5% advantage. This workload likely scales better with the Pro Vega II's massive 4096-bit memory bus and 32 GB of HBM2 memory. The 16.5% delta is the largest single difference in the head-to-head data, and it aligns with the Pro Vega II's positioning as a compute-oriented workstation part. The RX 6850M XT's 12 GB of GDDR6 on a 192-bit bus is a significant bottleneck for memory-heavy OpenCL tasks.

The Vulkan result is effectively a tie. The Pro Vega II scores 99,621, and the RX 6850M XT scores 99,483, a 0.1% difference. This near-parity in a modern cross-platform API is notable. It suggests that for gaming-oriented Vulkan titles, the newer architecture of the RX 6850M XT compensates almost perfectly for its smaller memory subsystem and fewer compute units. The data implies that while the Pro Vega II dominates in compute-heavy OpenCL, the RX 6850M XT is a much closer competitor in graphics-centric APIs like Metal and Vulkan.

The aggregate average benchmark score reinforces the Pro Vega II's lead. Its average is 109,617 across all recorded tests, while the RX 6850M XT averages 78,940. That is a 38.9% gap. However, this average includes the RX 6850M XT's 3DMark Steel Nomad DX12 score of 2,257, which is not a comparable metric to Geekbench scores and drags down its average significantly. The head-to-head data, which isolates the same test, is the more reliable indicator of relative performance.

FAQ

Q: Which GPU wins in Geekbench Metal?

A: The AMD Radeon Pro Vega II wins with a score of 130,183, edging out the RX 6850M XT's 128,981 by 0.9%.

Q: How large is the OpenCL performance gap?

A: The Pro Vega II is 16.5% faster in OpenCL, scoring 99,048 versus the RX 6850M XT's 85,040.

Q: Is the RX 6850M XT competitive in Vulkan?

A: Yes, it is nearly identical. The Pro Vega II scores 99,621, and the RX 6850M XT scores 99,483, a difference of just 0.1%.

Q: What is the average benchmark score for each GPU?

A: The Pro Vega II has an average benchmark score of 109,617, while the RX 6850M XT averages 78,940, a substantial overall lead for the Pro Vega II.

Q: How does the Pro Vega II compare to its closest rival, the AMD Radeon PRO W7900?

A: The Radeon PRO W7900 has an average score of 110,725, which is 1% higher than the Pro Vega II's average, making it a very close competitor.

Q: Where does the RX 6850M XT sit relative to NVIDIA's GeForce RTX 5090?

A: The RX 6850M XT's average score of 78,940 is 1.1% lower than the RTX 5090's 79,842, placing them in a similar performance tier according to the recorded data.

Architecture Differences

The two GPUs are built on fundamentally different architectures. The Pro Vega II uses GCN 5.1, a mature design optimized for compute and workstation tasks, while the RX 6850M XT uses RDNA 2.0, a gaming-focused architecture with significant efficiency improvements.

The process node is identical, 7 nm at TSMC, but the transistor counts differ. The Pro Vega II packs 13,230 million transistors into a 331 mm² die, while the RX 6850M XT has 17,200 million transistors on a slightly larger 335 mm² die. This gives the RX 6850M XT a much higher transistor density of 51.3M per mm² versus 40.0M per mm², reflecting RDNA 2.0's more compact and efficient design.

The compute resources are starkly different. The Pro Vega II has 4096 shading units, 256 TMUs, and 64 ROPs. The RX 6850M XT has 2560 shading units, 160 TMUs, and 64 ROPs. Despite having 60% more shading units, the Pro Vega II's FP32 throughput is only 14.09 TFLOPS versus the RX 6850M XT's 13.21 TFLOPS. The RX 6850M XT's much higher clocks, with a base of 2321 MHz and boost of 2581 MHz, nearly compensate for its smaller core count.

The memory subsystems are completely different. The Pro Vega II uses 32 GB of HBM2 on a 4096-bit bus, delivering 825.3 GB/s of bandwidth. The RX 6850M XT uses 12 GB of GDDR6 on a 192-bit bus, providing 432.0 GB/s. The Pro Vega II's bandwidth advantage is enormous at 91% higher, but it comes at the cost of a much larger and more power-hungry memory system.

A critical architectural difference is the presence of ray tracing cores. The RX 6850M XT has 40 dedicated RT cores and supports DirectX 12 Ultimate (12_2). The Pro Vega II has no RT cores and is limited to DirectX 12 (12_1). The RX 6850M XT also supports Vulkan 1.4, while the Pro Vega II is capped at Vulkan 1.3.

The Verdict

The data supports a clear division of use cases. The AMD Radeon Pro Vega II is the superior choice for compute-heavy workloads, as demonstrated by its 16.5% OpenCL win. Its massive 32 GB HBM2 memory pool and 825.3 GB/s bandwidth are unmatched by the RX 6850M XT. It also holds a slight edge in Metal and Vulkan, though those margins are small.

The AMD Radeon RX 6850M XT is the more practical choice for gaming and mobile use. It has dedicated ray tracing cores, supports DirectX 12 Ultimate, and consumes only 165 W TDP compared to the Pro Vega II's 475 W. Its 12 GB of GDDR6 memory is sufficient for modern gaming, and its Vulkan performance is statistically tied with the Pro Vega II.

The Pro Vega II's quad-slot form factor, Apple MPX bus interface, and 850 W suggested PSU make it unsuitable for any conventional desktop or laptop. The RX 6850M XT is an integrated graphics processor (IGP) with no power connectors, designed to be soldered into laptops. The choice is not about which is "better" but which fits the intended environment.

For a professional workstation tasked with rendering, scientific compute, or large dataset processing, the Pro Vega II's OpenCL dominance and 32 GB memory capacity make it the clear pick. For a gaming laptop that needs to handle ray-traced titles and run on battery power, the RX 6850M XT is the only viable option between the two.

Specification Differences

The two cards differ in nearly every specification category. The Pro Vega II has a base clock of 1574 MHz and boost of 1720 MHz, while the RX 6850M XT runs much faster at 2321 MHz base and 2581 MHz boost. The Pro Vega II's memory operates at 806 MHz with an effective rate of 1612 Mbps, while the RX 6850M XT's GDDR6 runs at 2250 MHz with an effective rate of 18 Gbps.

Memory capacity is 32 GB HBM2 for the Pro Vega II versus 12 GB GDDR6 for the RX 6850M XT. The bus widths are 4096-bit and 192-bit, respectively, leading to bandwidths of 825.3 GB/s and 432.0 GB/s. The Pro Vega II has 4096 shading units and 256 TMUs; the RX 6850M XT has 2560 shading units and 160 TMUs. Both have 64 ROPs.

The Pro Vega II's pixel rate is 110.1 GPixel/s, while the RX 6850M XT achieves 165.2 GPixel/s due to its higher clocks. Texture rates are closer: 440.3 GTexel/s for the Pro Vega II versus 413.0 GTexel/s for the RX 6850M XT. FP32 performance is 14.09 TFLOPS for the Pro Vega II and 13.21 TFLOPS for the RX 6850M XT. FP16 is 28.18 TFLOPS and 26.43 TFLOPS, respectively.

The Pro Vega II consumes 475 W TDP and requires an 850 W PSU, while the RX 6850M XT is rated at 165 W with no power connectors. The Pro Vega II uses an Apple MPX bus interface and is quad-slot; the RX 6850M XT uses PCIe 4.0 x16 and is an IGP. Display outputs are 1x HDMI 2.0b and 4x Thunderbolt for the Pro Vega II, while the RX 6850M XT's are portable device dependent.

Where Each One Wins

AMD Radeon Pro Vega II wins on:

• OpenCL compute: 16.5% faster than the RX 6850M XT (99,048 vs 85,040).
• Overall average benchmark score: 109,617 versus 78,940, a 38.9% lead.
• Memory bandwidth: 825.3 GB/s versus 432.0 GB/s, a 91% advantage.
• Memory capacity: 32 GB versus 12 GB.
• Shading units: 4096 versus 2560.
• FP32 performance: 14.09 TFLOPS versus 13.21 TFLOPS.
• Texture rate: 440.3 GTexel/s versus 413.0 GTexel/s.
• Metal performance: 130,183 versus 128,981, a 0.9% win.
• Vulkan performance: 99,621 versus 99,483, a 0.1% win.

AMD Radeon RX 6850M XT wins on:

• Clock speeds: 2321 MHz base and 2581 MHz boost versus 1574 MHz and 1720 MHz.
• Pixel rate: 165.2 GPixel/s versus 110.1 GPixel/s.
• Power efficiency: 165 W TDP versus 475 W TDP.
• Ray tracing: 40 RT cores versus none.
• DirectX support: 12 Ultimate (12_2) versus 12 (12_1).
• Vulkan version: 1.4 versus 1.3.
• Transistor density: 51.3M per mm² versus 40.0M per mm².
• Form factor: IGP with no power connectors versus quad-slot with Apple MPX interface.