AMD Radeon Pro Vega 56 vs AMD Radeon RX 6900 XT Comparison

# AMD Radeon Pro Vega 56 vs AMD Radeon RX 6900 XT

The AMD Radeon Pro Vega 56 and AMD Radeon RX 6900 XT represent two distinct eras of AMD GPU design. The Pro Vega 8 GB HBM2 memory, and the RX 6900 XT ships as a triple-slot card.

The Pro Vega 56 sits at the 89th percentile among all GPUs, placing it ahead of the AMD Radeon Pro WX 9100 and other rivals. The RX 6900 XT lands at the 86th percentile. The RX 6900 XT's average score places it behind the NVIDIA CMP 50HX in the recorded data. The Pro Vega 56 has a Vulkan API version of 1. The RX 6900 XT has a 2:1 FP32 compute throughput.

FAQ

Q: Which GPU wins in the Geekbench OpenCL test?

A: The RX 6900 XT scores 187,673 in OpenCL, a 67% lead over the Pro Vega 56, which records 61,930 points in the same test.

Q: Does the Pro Vega 56 have a higher boost clock than the RX 6900 XT?

A: No, the RX 6900 XT boosts up to 2,250 MHz, while the Pro Vega 56 boosts to 1,250 MHz. The Pro Vega 56 has a base clock of 1,138 MHz.

Q: How much VRAM does the Pro Vega 56 use?

A: The Pro Vega 56 uses 8 GB of HBM2 memory on a 2,048 bit bus interface, delivering 402.4 GB/s bandwidth. The RX 6900 XT carries 16 GB of GDDR6 memory on 256 bit bus.

Q: Which GPU has more shading units in the RX 6900 XT?

A: The RX 6900 XT has 5,120 shading units, with 80 ray tracing cores, and 128 ROPs.

Q: What process node is the RX 6900 XT built on?

A: The RX 6900 XT uses a 7 nm node from TSMC, while the Pro Vega 56 uses 14 nm from GlobalFoundries.

Q: What GPU has a higher pixel rate in the RX 6900 XT?

A: The RX 6900 XT has a pixel rate of 288.0 GPixel/s, and the Pro Vega 56 has 80.0 GPixel/s. The RX 6900 XT uses a PCIe 4.0 x16 interface.

Q: Which GPU has a Geekbench Vulkan score of 148,525 in the RX 6900 XT?

A: The RX 6900 XT scores 148,525 in Vulkan, with the Pro Vega 56 records 66,004 points in the same test. The RX 6900 XT uses a 26,800 million transistor count.

Q: What is the RX 6900 XT's average score?

A: The RX 6900 XT has an average benchmark score of 50,951. The Pro Vega 56 has an average score of 63,693. The Pro Vega 56 has a texture rate of 280.0 GTexel/s.

The Verdict

The data shows the RX 6900 XT is the clear performance leader across every shared benchmark. In Geekbench OpenCL, it beats the Pro Vega 56 by 67%. In Geekbench Metal, the RX 6900 XT leads by 64.3%. In Geekbench Vulkan, it wins by 55.6%. The RX 6900 XT wins 3 of 3 head-to-head comparisons, making it the obvious choice for anyone seeking maximum compute performance in the recorded tests.

The Pro Vega 56 still holds a place for users who prioritize its specific characteristics. It is an integrated form factor (IGP) with no power connectors, while the RX 6900 XT requires a triple-slot design with two 8-pin connectors and a 700 W power supply. The Pro Vega 56 offers display outputs of 1x HDMI 2.0b and 3x DisplayPort 1.4a, while the RX 6900 XT provides 1x HDMI 2.1, 2x DisplayPort 1.4a, and 1x USB Type-C. The Pro Vega 56 supports DirectX 12 (12_1), while the RX 6900 XT supports DirectX 12 Ultimate (12_2).

The RX 6900 XT is positioned for high-end gaming and compute workloads with its higher memory capacity, faster memory type, and larger transistor budget. The Pro Vega 56 is for systems that need a compact, low-power GPU with HBM2 memory and no external power requirement, though its performance is substantially lower in every measured test. The RX 6900 XT has a launch MSRP of 999 USD.

Head-to-Head Benchmarks

The head-to-head data shows the RX 6900 XT delivers a dominant performance in all three common tests. In Geekbench Metal, the RX 6900 XT scores 177,021 versus the Pro Vega 56's 63,145, a 64.3% difference. This is the smallest gap of the three tests. In Geekbench Vulkan, the RX 6900 XT scores 148,525 against 66,004, a 55.6% lead. In Geekbench OpenCL, the RX 6900 XT reaches 187,673 while the Pro Vega 56 manages 61,930, a 67% advantage.

The Pro Vega 56 cannot win a single head-to-head test in the database records. Its best result relative to the RX 6900 XT is in Vulkan, where it trails by 55.6%. In Metal, it trails by 64.3%. In OpenCL, it trails by 67%. The RX 6900 XT's 3-0 record in wins reflects the enormous architectural advantage it holds in compute throughput.

Looking only at the nearest rivals for context, the Pro Vega 56's average score of 63,693 is nearly identical to the AMD Radeon RX 7600M, which scores 63,775, showing a 0.1% difference. The RX 6900 XT's average of 50,951 sits between the NVIDIA CMP 50HX, which scores 51,790, and the AMD Radeon RX Vega 64, which scores 50,001. These rival positions do not change the outcome of the head-to-head comparison: the RX 6900 XT is far ahead of the Pro Vega 56 in every shared benchmark.

Specification Differences

The two GPUs differ in nearly every specification category. The Pro Vega 56 uses 8 GB of HBM2 memory with a 2,048 bit bus and 402.4 GB/s bandwidth. The RX 6900 XT uses 16 GB of GDDR6 memory with a 256 bit bus and 512.0 GB/s bandwidth, giving it higher total bandwidth but a narrower physical interface. The memory clock also differs: the Pro Vega 56 runs memory at 786 MHz (1,572 Mbps effective), while the RX 6900 XT runs memory at 2,000 MHz (16 Gbps effective).

The clock speeds are also quite different. The Pro Vega 56 has a base clock of 1,138 MHz and boost of 1,250 MHz, while the RX 6900 XT has a base clock of 1,825 MHz and boost of 2,250 MHz, with a game clock of 1,015 MHz. The RX 6900 XT's boost is 1,000 MHz higher than the Pro Vega 56's boost. The FP32 performance reflects this, with the Pro Vega 56 at 8,960 TFLOPS versus the RX 6900 XT's 23.04 TFLOPS, a 2.5 times difference in FP32 throughput. FP16 performance is similarly scaled: the Pro Vega 56 delivers 17.92 TFLOPS (2:1 ratio) versus the RX 6900 XT's 46.08 TFLOPS (2:1 ratio).

Power and physical dimensions also vary. The Pro Vega 56 is rated at 210 W TDP, uses no power connectors, and is listed as an integrated form factor. The RX 6900 XT is rated at 300 W TDP, requires 2x 8-pin power connectors, and is a triple-slot card with dimensions of 267 mm length, 120 mm height, and 50 mm width. The bus interface differs: the Pro Vega 56 uses PCIe 3.0 x16 while the RX 6900 XT uses PCIe 4.0 x16.

Display outputs are not shared. The Pro Vega 56 offers 1x HDMI 2.0b and 3x DisplayPort 1.4a. The RX 6900 XT offers 1x HDMI 2.1, 2x DisplayPort 1.4a, and 1x USB Type-C. The Pro Vega 56 supports DirectX 12 (12_1), OpenGL 4.6, and Vulkan 1.3. The RX 6900 XT supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Architecture Differences

The architecture gap between the two is significant. The Pro Vega 56 is built on the GCN 5.0 architecture with the Vega 10 chip, while the RX 6900 XT uses RDNA 2.0 architecture with the Navi 21 chip. The Pro Vega 56 belongs to the Radeon Pro Mac (Vega Series generation, while the RX 6900 XT belongs to the Navi II (RX 6000) generation. The RX 6900 XT lists its predecessor as Navi and successor as Navi III.

The process technology and foundry differ too. The Pro Vega 56 uses a 14 nm process from GlobalFoundries, while the RX 6900 XT uses a 7 nm process from TSMC. The transistor count is more than double on the RX 6900 XT at 26,800 million versus the Pro Vega 56's 12,500 million transistors. The die size is similar at 495 mm² for the Pro Vega 56 and 520 mm² for the RX 6900 XT. (These are the only specifications where the two are close.) The transistor density is also different: the Pro Vega 56 has 25.3M / mm² density, the RX 6900 XT has 51.5M / mm² density.

The RX 6900 XT adds 80 ray tracing cores, a feature the Pro Vega 56 does not have. TMUs and ROPs also differ, with the Pro Vega 56 having 224 TMUs and 64 ROPs, while the RX 6900 XT has 320 TMUs and 128 ROPs.

The RX 6900 XT's production status is end-of-life for both GPUs. The release dates are also distinct: the Pro Vega 56 was released in 2017-08-13T00:00:00.000Z, while the RX 6900 XT was released in 2020-10-10-10-27T00:00:00.000Z. The RX 6900 XT's Game clock is 2,015 MHz, which is higher than the Pro Vega 56's boost clock of 1,250 MHz.

The RX 6900 XT has a higher memory bandwidth of 512.0 GB/s compared to the Pro Vega 56's 402.4 GB/s. The RX 6900 XT has a pixel rate of 288.0 GPixel/s, while the Pro Vega 56 has 80.0 GPixel/s. The RX 6900 XT has a texture rate of 720.0 GTexel/s, while the Pro Vega 56 has 280.0 GTexel/s.