AMD Radeon PRO V620 vs AMD Radeon Pro Vega II Duo Comparison

The Verdict

The data separates these two AMD workstation cards clearly. The AMD Radeon PRO V620 is the outright performance winner in every shared benchmark, posting an average benchmark score of 136,472 against the Radeon Pro Vega II Duo’s 106,750. That is a 27.8% gap in aggregate compute output, placing the V620 in the 96th percentile of all GPUs while the Vega II Duo sits in the 94th. If your workload is raw number-crunching — OpenCL or Vulkan compute — the V620 is the only rational choice from this pairing.

However, the Vega II Duo is not without a constituency. It offers the same 32 GB of memory as the V620, but does so with a vastly wider 4096-bit bus and HBM2, delivering 1.02 TB/s of bandwidth versus 512.0 GB/s. For memory-bound tasks that saturate bandwidth rather than raw FLOPs, the Duo’s design philosophy is different. It also carries display outputs — 1x HDMI 2.0b and 4x Thunderbolt — where the V620 has none. The verdict: pick the V620 for pure compute density and API modernity; pick the Vega II Duo only if you specifically need integrated display connectivity over Thunderbolt and can tolerate its lower compute throughput and older architecture.

Architecture Differences

The two cards represent distinct architectural eras within AMD’s professional lineup. The Radeon PRO V620 uses the Navi 21 chip on RDNA 2.0, built on TSMC’s 7 nm process. It packs 26,800 million transistors onto a 520 mm² die, yielding a transistor density of 51.5 million per square millimeter. The Radeon Pro Vega II Duo uses the Vega 20 chip on GCN 5.1, also on TSMC’s 7 nm, but with just 13,230 million transistors on a 331 mm² die — a 40.0 million per square millimeter density. The V620’s newer architecture translates directly into higher clock speeds: it boosts to 2200 MHz versus the Duo’s 1720 MHz, with base clocks of 1825 MHz and 1400 MHz respectively.

Compute resources differ substantially. The V620 fields 4608 shading units, 288 texture mapping units, and 128 ROPs, plus 72 dedicated ray tracing cores. The Vega II Duo counters with 4096 shading units, 256 TMUs, and only 64 ROPs, with no ray tracing hardware at all. That absence of RT cores limits the Duo to DirectX 12 (12_1) and Vulkan 1.3, while the V620 supports DirectX 12 Ultimate (12_2) and Vulkan 1.4. Both cards support OpenGL 4.6. Memory configurations share 32 GB capacity, but the type and bus are polar opposites: GDDR6 on a 256-bit bus for the V620 versus HBM2 on a 4096-bit bus for the Duo. The bandwidth result is a near 2:1 advantage for the Duo — 1.02 TB/s versus 512.0 GB/s.

Physical and power profiles diverge even more. The V620 is a dual-slot card drawing 300 W with two 8-pin connectors and a 700 W suggested PSU, measuring 267 mm in length. The Vega II Duo is a quad-slot behemoth rated at 475 W with an 850 W suggested PSU, using Apple’s MPX bus interface rather than standard PCIe. The V620 uses PCIe 4.0 x16; the Duo relies on the proprietary Apple MPX form factor. The V620 has no display outputs, while the Duo provides 1x HDMI 2.0b and 4x Thunderbolt. Production status for both is end-of-life. The V620 launched in November 2021, the Duo in June 2019. The Duo had a launch MSRP of 4,399 USD; the V620 has no listed launch MSRP.

Head-to-Head Benchmarks

The shared benchmark suite contains two tests, and the V620 wins both decisively. In Geekbench OpenCL, the V620 scores 128,580 against the Duo’s 98,432 — a 30.6% advantage. That margin is substantial, reflecting the combination of higher clock speeds (2200 MHz boost versus 1720 MHz), more shaders (4608 versus 4096), and the architectural efficiency of RDNA 2.0 over GCN 5.1. The V620’s FP32 throughput of 20.28 TFLOPS versus 14.09 TFLOPS for the Duo corroborates this dominance in general compute.

The gap widens in Geekbench Vulkan. The V620 posts 144,364, while the Duo manages 99,296 — a 45.4% delta. This is the single largest performance differential between the two cards. The V620’s Vulkan 1.4 support and hardware ray tracing cores likely contribute to this outsized advantage in a modern graphics API workload. The Duo’s older GCN architecture, limited to Vulkan 1.3 and lacking RT acceleration, simply cannot keep pace. In terms of pixel and texture throughput, the V620 leads with 281.6 GPixel/s and 633.6 GTexel/s, compared to the Duo’s 110.1 GPixel/s and 440.3 GTexel/s.

Context from nearest rivals reinforces the V620’s standing. Its avg score of 136,472 sits just 0.5% ahead of the AMD Radeon Pro W6800X Duo (135,774) and 0.8% ahead of the AMD Radeon PRO W6800 (135,396). It edges out the NVIDIA A10M (135,230) by 0.9% and the RTX 4000 Ada Generation (135,218) by the same margin. The Vega II Duo, by contrast, trails its own nearest rivals: it is 0.6% behind the AMD Radeon Pro W6600X (107,342), 2.6% behind the AMD Radeon Pro Vega II (109,617), and 3.6% behind the AMD Radeon PRO W7900 (110,725). It only leads the NVIDIA Quadro RTX 6000 (101,872) by 4.8%. The V620 is competitive with top-tier modern workstation GPUs; the Duo is clearly a generation behind.

FAQ

Q: Which card has more raw compute performance?

A: The AMD Radeon PRO V620. It delivers 20.28 TFLOPS FP32 versus 14.09 TFLOPS for the Radeon Pro Vega II Duo, and it wins Geekbench OpenCL by 30.6% and Vulkan by 45.4%.

Q: Does the Vega II Duo offer any advantage in memory bandwidth?

A: Yes. The Duo’s HBM2 memory on a 4096-bit bus provides 1.02 TB/s of bandwidth, exactly double the 512.0 GB/s of the V620’s GDDR6 on a 256-bit bus, despite both cards having 32 GB capacity.

Q: Can either card output video to displays?

A: Only the Radeon Pro Vega II Duo can. It has 1x HDMI 2.0b and 4x Thunderbolt outputs. The Radeon PRO V620 has no display outputs whatsoever, making it a compute-only card.

Q: What is the difference in API support?

A: The V620 supports DirectX 12 Ultimate (12_2) and Vulkan 1.4, while the Duo is limited to DirectX 12 (12_1) and Vulkan 1.3. Both support OpenGL 4.6.

Q: How do their power requirements compare?

A: The V620 has a 300 W TDP and a 700 W suggested PSU, while the Vega II Duo draws 475 W and requires an 850 W suggested PSU. The Duo is also a quad-slot card versus the V620’s dual-slot design.

Q: Which card has higher transistor density?

A: The V620 has 51.5 million transistors per square millimeter (26,800 million total on 520 mm²), versus 40.0 million per square millimeter for the Duo (13,230 million total on 331 mm²).

Where Each One Wins

The AMD Radeon PRO V620 wins in every measured compute category. It is 30.6% faster in OpenCL and 45.4% faster in Vulkan. It has higher clock speeds (2200 MHz boost versus 1720 MHz), more shading units (4608 versus 4096), more ROPs (128 versus 64), and dedicated ray tracing cores that the Duo lacks entirely. Its FP32 throughput is 44% higher (20.28 versus 14.09 TFLOPS), and its pixel rate is more than 2.5 times higher (281.6 versus 110.1 GPixel/s). The V620 also supports newer API versions — Vulkan 1.4 and DirectX 12 Ultimate — making it the better choice for modern compute stacks, ray-traced workloads, and any application leveraging the latest graphics features. Its PCIe 4.0 x16 interface is standard, and its dual-slot, 300 W profile fits conventional workstation chassis with a 700 W PSU.

The AMD Radeon Pro Vega II Duo wins decisively in memory bandwidth: 1.02 TB/s versus 512.0 GB/s. For workloads that are bandwidth-limited rather than compute-limited — large data transfers, certain scientific simulations, or high-resolution texture streaming — the Duo’s HBM2 advantage could be meaningful. It also provides integrated display outputs (1x HDMI 2.0b, 4x Thunderbolt), making it a self-contained solution for Mac Pro environments where the Apple MPX interface is native and external GPUs are not needed. Its 475 W TDP and 850 W PSU requirement are higher, but the quad-slot design allows for more substantial cooling. The Duo’s lower average score (106,750 versus 136,472) places it behind the AMD Radeon Pro W6600X by 0.6% and the AMD Radeon Pro Vega II by 2.6%, but ahead of the NVIDIA Quadro RTX 6000 by 4.8%. Its niche is narrow: memory-bandwidth-hungry tasks and Apple ecosystem integration. For everything else, the V620 is the data-backed winner.