AMD Radeon Pro Vega 64X vs NVIDIA L20 Comparison

FAQ

Q: How does the NVIDIA L20 compare to the AMD Radeon Pro Vega 64X in overall benchmark performance?

A: The NVIDIA L20 has an average benchmark score of 251,147, while the AMD Radeon Pro Vega 64X averages 80,959. The L20 is 249.5% ahead in the Geekbench OpenCL test, the only head-to-head benchmark recorded.

Q: What are the key architectural differences between the two GPUs?

A: The NVIDIA L20 uses the Ada Lovelace architecture on a 5 nm process with 76,300 million transistors, while the AMD Radeon Pro Vega 64X uses GCN 5.0 on a 14 nm process with 12,500 million transistors. The L20 also features 92 RT cores and 368 tensor cores, which the Vega 64X lacks entirely.

Q: How do the memory subsystems differ?

A: The NVIDIA L20 has 48 GB of GDDR6 memory on a 384-bit bus with 864.0 GB/s bandwidth. The AMD Radeon Pro Vega 64X has 16 GB of HBM2 memory on a 2048-bit bus with 512.0 GB/s bandwidth.

Q: Which GPU has higher compute throughput?

A: The NVIDIA L20 delivers 59.35 TFLOPS FP32 and 59.35 TFLOPS FP16 (1:1 ratio). The AMD Radeon Pro Vega 64X delivers 12.03 TFLOPS FP32 and 24.05 TFLOPS FP16 (2:1 ratio).

Q: What is the production status of each card?

A: The NVIDIA L20 is listed as Active and was released on November 15, 2023. The AMD Radeon Pro Vega 64X is End-of-life and was released on March 18, 2019.

Q: How do the two cards rank among all GPUs in the database?

A: The NVIDIA L20 sits in the 99th percentile among all GPUs, while the AMD Radeon Pro Vega 64X sits in the 92nd percentile.

Architecture Differences

The NVIDIA L20 and AMD Radeon Pro Vega 64X represent completely different eras of GPU design. The L20 is built on the Ada Lovelace architecture using TSMC's 5 nm process node, packing 76,300 million transistors into a 609 mm² die. This results in a transistor density of 125.3 million per mm². In contrast, the Vega 64X uses AMD's GCN 5.0 architecture on GlobalFoundries' 14 nm node, with 12,500 million transistors on a 495 mm² die, yielding just 25.3 million transistors per mm². The density gap is stark: the L20 packs nearly five times more transistors per square millimeter.

The compute pipelines diverge dramatically. The L20 has 11,776 shading units, 368 texture mapping units, and 128 ROPs. It also includes dedicated hardware for ray tracing: 92 RT cores. Additionally, it has 368 tensor cores for AI workloads. The Vega 64X, by comparison, has 4,096 shading units, 256 TMUs, and 64 ROPs. It has no RT cores and no tensor cores, meaning it lacks hardware acceleration for ray tracing and tensor-based operations. The Vega 64X does have a FP16 throughput advantage in ratio terms: it processes FP16 at 2:1 versus FP32, reaching 24.05 TFLOPS, while the L20 runs FP16 at a 1:1 ratio, also hitting 59.35 TFLOPS. Even with the ratio advantage, the Vega 64X's absolute FP16 output is less than half the L20's.

The memory architectures reflect different design philosophies. The L20 uses 48 GB of GDDR6 on a 384-bit bus, achieving 864.0 GB/s bandwidth. The Vega 64X uses 16 GB of HBM2 on a 2048-bit bus, achieving 512.0 GB/s. The L20's memory clock is 2250 MHz (18 Gbps effective), while the Vega 64X's is 1000 MHz (2 Gbps effective). The L20's wider effective bandwidth comes from its much faster memory clock, despite the narrower bus.

Power and physical design also differ. The L20 has a 275 W TDP, uses a dual-slot form factor, requires a single 16-pin power connector, and recommends a 600 W PSU. The Vega 64X has a 250 W TDP, is classified as an IGP (integrated graphics processor), requires no power connectors, and has no suggested PSU rating. The L20 is a discrete PCIe 4.0 x16 card measuring 267 mm in length and 111 mm in height, while the Vega 64X is a PCIe 3.0 x16 part with dimensions listed as portable device dependent. Display outputs also differ: the L20 offers 4x DisplayPort 1.4a, while the Vega 64X's outputs are portable device dependent.

API support shows another generational gap. The L20 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The Vega 64X supports DirectX 12 (12_1), OpenGL 4.6, and Vulkan 1.3. The L20's DirectX 12 Ultimate certification includes features like ray tracing and mesh shaders, which the Vega 64X cannot claim.

Head-to-Head Benchmarks

The only recorded head-to-head benchmark between these two GPUs is Geekbench OpenCL. The NVIDIA L20 scores 274,276, while the AMD Radeon Pro Vega 64X scores 78,467. The L20 wins by 249.5%, a massive margin that reflects the fundamental architectural and generational differences between the cards. This is not a close contest; the L20 delivers more than three times the OpenCL performance of the Vega 64X.

Looking at the broader benchmark context, the L20 also has a Geekbench Vulkan score of 228,018, which the Vega 64X does not have a corresponding Vulkan entry for in the database. The Vega 64X does have a Geekbench Metal score of 83,450, a test that the L20 does not participate in, reflecting the Vega 64X's macOS-oriented design (it belongs to the Radeon Pro Mac generation). The OpenCL results are the only directly comparable metric, and they strongly favor the L20.

The L20's average benchmark score of 251,147 places it 11.6% above the NVIDIA PG506-232 (225,124) and 14.2% above the AMD Radeon PRO W7900D (219,827). It trails the NVIDIA L40 (284,111) by 11.6% and the NVIDIA RTX 6000 Ada Generation (287,237) by 12.6%. The Vega 64X, with its average score of 80,959, sits just 1.3% below the AMD Radeon PRO W6600 (81,995), 1.4% above the NVIDIA GeForce RTX 5090 (79,842), 1.7% above the NVIDIA Tesla P100 PCIe 16 GB (79,605), and 2% above the NVIDIA Tesla P100 PCIe 12 GB (79,396). These rival comparisons show that the L20 competes at the high end of workstation and server GPUs, while the Vega 64X sits near the mid-range of that era.

Specification Differences

The following specifications differ between the NVIDIA L20 and AMD Radeon Pro Vega 64X:

• Architecture: Ada Lovelace vs GCN 5.0
• Process node: 5 nm (TSMC) vs 14 nm (GlobalFoundries)
• Transistors: 76,300 million vs 12,500 million
• Die size: 609 mm² vs 495 mm²
• Transistor density: 125.3M / mm² vs 25.3M / mm²
• Base clock: 1440 MHz vs 1250 MHz
• Boost clock: 2520 MHz vs 1468 MHz
• Memory clock: 2250 MHz (18 Gbps effective) vs 1000 MHz (2 Gbps effective)
• Memory size: 48 GB vs 16 GB
• Memory type: GDDR6 vs HBM2
• Memory bus width: 384 bit vs 2048 bit
• Memory bandwidth: 864.0 GB/s vs 512.0 GB/s
• Shading units: 11,776 vs 4,096
• TMUs: 368 vs 256
• ROPs: 128 vs 64
• RT cores: 92 vs none
• Tensor cores: 368 vs none
• Pixel rate: 322.6 GPixel/s vs 93.95 GPixel/s
• Texture rate: 927.4 GTexel/s vs 375.8 GTexel/s
• FP32 performance: 59.35 TFLOPS vs 12.03 TFLOPS
• FP16 performance: 59.35 TFLOPS (1:1) vs 24.05 TFLOPS (2:1)
• TDP: 275 W vs 250 W
• Slot width: Dual-slot vs IGP
• Power connectors: 1x 16-pin vs none
• Suggested PSU: 600 W vs none
• Bus interface: PCIe 4.0 x16 vs PCIe 3.0 x16
• Display outputs: 4x DisplayPort 1.4a vs Portable Device Dependent
• DirectX support: 12 Ultimate (12_2) vs 12 (12_1)
• Vulkan support: 1.4 vs 1.3
• Dimensions: 267 mm length, 111 mm height vs none listed
• Production status: Active vs End-of-life
• Release date: November 15, 2023 vs March 18, 2019
• Generation: Server Ada (Lxx) vs Radeon Pro Mac (Vega Series)
• Predecessor/successor: Server Ampere predecessor, Server Hopper successor vs none listed

Where Each One Wins

The NVIDIA L20 wins in every measured compute category. Its FP32 throughput of 59.35 TFLOPS is nearly five times the Vega 64X's 12.03 TFLOPS. Its FP16 output of 59.35 TFLOPS is more than double the Vega 64X's 24.05 TFLOPS. The L20 also dominates in pixel rate (322.6 GPixel/s vs 93.95 GPixel/s) and texture rate (927.4 GTexel/s vs 375.8 GTexel/s). Memory bandwidth favors the L20 at 864.0 GB/s versus 512.0 GB/s, and its 48 GB capacity is triple the Vega 64X's 16 GB.

The Vega 64X has no benchmark wins in the recorded data. Its only advantages are structural rather than performance-based: it consumes slightly less power (250 W vs 275 W), requires no external power connectors, and fits an IGP form factor, making it suitable for integrated or portable designs. Its HBM2 memory uses a wider 2048-bit bus, which is an architectural curiosity but does not translate into higher bandwidth. The Vega 64X also has a Metal benchmark score of 83,450, indicating some macOS compatibility, while the L20 has no Metal entry.

For use cases, the L20 is the clear choice for compute-heavy workloads: AI inference, ray tracing, high-bandwidth data processing, and any task requiring large memory capacity. Its 92 RT cores and 368 tensor cores make it suitable for graphics rendering with ray tracing and for machine learning acceleration. The Vega 64X, given its end-of-life status and 2019 release, is only relevant for legacy Mac environments or systems where its IGP form factor and lack of power connectors are required.

The Verdict

The data is unambiguous: the NVIDIA L20 is the superior GPU in every measurable performance category. Its 249.5% lead in Geekbench OpenCL, combined with its 99th percentile ranking versus the Vega 64X's 92nd percentile, establishes it as a high-end server and workstation part. The L20's nearest rivals include the NVIDIA L40 and RTX 6000 Ada Generation, both of which exceed it by roughly 11.6% to 12.6%, placing it just below the top tier of NVIDIA's Ada lineup but far above the Vega 64X.

The AMD Radeon Pro Vega 64X is a legacy product from 2019, built on GCN 5.0, a now-outdated architecture. Its nearest rivals include the AMD Radeon PRO W6600 and NVIDIA Tesla P100 variants, all within 2% of its average score. This places it in a completely different performance class. The Vega 64X should only be considered for systems that specifically require its IGP form factor, lack of power connectors, or Metal API support for macOS environments. It offers no competitive advantage in raw compute, memory bandwidth, or feature support.

For anyone choosing between these two GPUs, the L20 is the only viable option for modern workloads. It delivers nearly five times the FP32 performance, triple the memory capacity, and includes dedicated RT and tensor cores that the Vega 64X simply does not have. The Vega 64X's only saving grace is its lower power draw and integrated form factor, but those come at the cost of being an end-of-life product with no path forward in compute performance. The verdict is clear: the NVIDIA L20 wins decisively, and the AMD Radeon Pro Vega 64X is only relevant in narrow legacy scenarios.