NVIDIA L20 vs NVIDIA RTX A4500 Mobile Comparison

The Verdict

The data separates these two NVIDIA GPUs into entirely different performance tiers and use cases. The NVIDIA L20 is the clear performance leader, winning both recorded head-to-head benchmarks by a massive margin. In Geekbench OpenCL, the L20 scores 274276 against the RTX A4500 Mobile’s 105307, a 160.5% advantage. In Geekbench Vulkan, the L20 posts 228018 versus 76960, a 196.3% lead. The L20 also sits at the 99th percentile of all GPUs in the database, while the RTX A4500 Mobile ranks at the 93rd percentile. For any workload that stresses compute or graphics through these APIs, the L20 is the only choice from this pair.

The RTX A4500 Mobile, however, is not without its place. It draws only 140 W compared to the L20’s 275 W, and it carries no power connectors, meaning it is designed to run entirely off its host system’s power delivery. The L20 requires a 16-pin connector and a 600 W suggested power supply. The A4500 Mobile is also an end-of-life product, while the L20 remains active in production. For a system builder needing a mobile or compact solution with lower power demands, the A4500 Mobile’s specifications make it feasible where the L20 would not fit. But strictly from benchmark performance, the L20 dominates, and the A4500 Mobile trails by over 150% in both recorded tests.

Architecture Differences

The two GPUs come from different architectural generations and foundries. The NVIDIA L20 is built on the Ada Lovelace architecture, specifically the AD102 chip, fabricated on a 5 nm process at TSMC. It packs 76,300 million transistors on a 609 mm² die, yielding a transistor density of 125.3 million per square millimeter. The RTX A4500 Mobile uses the Ampere architecture with the GA104 chip, made on Samsung’s 8 nm process. It contains 17,400 million transistors on a 392 mm² die, for a density of 44.4 million per square millimeter. That means the L20 has nearly 4.4 times the transistor count and roughly 2.8 times the density, a direct result of the newer process node.

The compute resources diverge sharply. The L20 has 11,776 shading units, 368 texture mapping units, 128 ROPs, 92 ray tracing cores, and 368 tensor cores. The A4500 Mobile has 5,888 shading units, 184 TMUs, 96 ROPs, 46 RT cores, and 184 tensor cores. The L20 exactly doubles the shading units, TMUs, RT cores, and tensor cores, while offering 1.33 times the ROPs. Clock speeds also favor the L20: it runs at a 1440 MHz base and 2520 MHz boost, versus the A4500 Mobile’s 930 MHz base and 1500 MHz boost. The L20’s boost clock is 68% higher, compounding the core count advantage.

Memory architecture differs as well. The L20 has 48 GB of GDDR6 on a 384 bit bus, with a memory clock of 2250 MHz (18 Gbps effective) and bandwidth of 864.0 GB/s. The A4500 Mobile has 16 GB of GDDR6 on a 256 bit bus, at 2000 MHz (16 Gbps effective), yielding 512.0 GB/s. The L20 offers 3 times the capacity and 1.69 times the bandwidth. Both cards support PCIe 4.0 x16, DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The L20’s generation is listed as “Server Ada (Lxx)”, while the A4500 Mobile is “Ampere-MW (Ax000)”, reflecting the former’s server orientation and the latter’s mobile workstation design.

Where Each One Wins

The L20 wins every measured benchmark category, so the use-case split is less about performance and more about physical and power constraints. The L20 is a dual-slot, 267 mm long, 111 mm tall card with four DisplayPort 1.4a outputs. It is designed for a server chassis or a desktop workstation with a 600 W power supply. The A4500 Mobile has no dimensions listed, no slot width, and its display outputs are described as “Portable Device Dependent”. It is a mobile GPU, meant to be soldered into a laptop or mobile workstation, drawing 140 W with no external power connectors.

For compute-heavy tasks like OpenCL workloads or Vulkan rendering, the L20’s 59.35 TFLOPS FP32 and FP16 (1:1) performance dwarfs the A4500 Mobile’s 17.66 TFLOPS in both precisions. The L20’s pixel rate is 322.6 GPixel/s versus 144.0 GPixel/s, and its texture rate is 927.4 GTexel/s versus 276.0 GTexel/s. If a workload fits within the L20’s power and size envelope, it wins outright. The A4500 Mobile’s only advantages are its lower power draw, lack of power connectors, and portability. For a laptop or a compact system that cannot accommodate a dual-slot server card, the A4500 Mobile is the only viable option from this pair.

FAQ

Q: Which GPU has higher raw compute performance?

A: The NVIDIA L20. Its FP32 and FP16 performance is 59.35 TFLOPS (1:1), while the RTX A4500 Mobile delivers 17.66 TFLOPS in both. The L20 is 160.5% ahead in Geekbench OpenCL and 196.3% ahead in Geekbench Vulkan.

Q: How do their memory capacities compare?

A: The L20 has 48 GB of GDDR6 on a 384 bit bus with 864.0 GB/s bandwidth. The A4500 Mobile has 16 GB of GDDR6 on a 256 bit bus with 512.0 GB/s. The L20 offers three times the capacity and 1.69 times the bandwidth.

Q: Are these GPUs from the same architecture generation?

A: No. The L20 uses Ada Lovelace (AD102 chip) on a 5 nm TSMC process, while the A4500 Mobile uses Ampere (GA104 chip) on an 8 nm Samsung process. The L20 has 76,300 million transistors versus 17,400 million for the A4500 Mobile.

Q: Can the RTX A4500 Mobile be installed in a desktop server?

A: The data does not support that. The A4500 Mobile has no slot width, no dimensions, and no power connectors. Its display outputs are “Portable Device Dependent”, indicating a mobile design. The L20 is a dual-slot card with a 267 mm length and 111 mm height.

Q: Which GPU has more ray tracing and tensor cores?

A: The L20 has 92 RT cores and 368 tensor cores. The A4500 Mobile has 46 RT cores and 184 tensor cores. The L20 doubles both counts.

Q: What is the production status of each GPU?

A: The L20 is listed as “Active” and was released on 2023-11-15. The A4500 Mobile is listed as “End-of-life” and was released on 2022-03-21.

Head-to-Head Benchmarks

The Geekbench OpenCL test shows the L20 scoring 274276 against the A4500 Mobile’s 105307. That is a delta of 160.5%, meaning the L20 is more than 2.6 times faster. The L20’s score places it near the top of the database, at the 99th percentile, while the A4500 Mobile sits at the 93rd percentile. The L20’s nearest rivals in the database are the NVIDIA L40 at 284111 (11.6% higher), the NVIDIA RTX 6000 Ada Generation at 287237 (12.6% higher), and the NVIDIA PG506-232 at 225124 (11.6% lower). The A4500 Mobile’s nearest rival is the desktop NVIDIA RTX A4500 at 91671, which is only 0.6% slower. That suggests the mobile variant performs almost identically to its desktop counterpart, but neither comes close to the L20.

The Geekbench Vulkan test amplifies the gap. The L20 scores 228018, while the A4500 Mobile scores 76960, a 196.3% difference. The L20’s Vulkan score is nearly three times the A4500 Mobile’s. In both tests, the L20 wins 2 and the A4500 Mobile wins 0, as recorded in the head-to-head data. The L20’s average benchmark score across all tests is 251147, versus 91134 for the A4500 Mobile, a ratio of roughly 2.76 to 1.

Looking at the L20’s rivals, the L40 and RTX 6000 Ada Generation are both slightly faster, by 11.6% and 12.6% respectively. That puts the L20 in a strong but not top-tier position among Ada server cards. The A4500 Mobile, by contrast, trades blows with the AMD Radeon Instinct MI60 (92466, 1.4% faster) and the NVIDIA Quadro GP100 (87445, 4.2% slower). The A4500 Mobile’s delta to its nearest rival, the desktop A4500, is only 0.6%, meaning the mobile part loses almost nothing to the desktop version in average score. But the architectural gap between Ampere and Ada Lovelace, plus the massive core and clock differences, makes the L20 the overwhelming winner here.

Specification Differences

The L20 and RTX A4500 Mobile differ in nearly every key specification. The L20 uses the AD102 chip on a 5 nm TSMC process, while the A4500 Mobile uses GA104 on an 8 nm Samsung process. Transistor count is 76,300 million for the L20 versus 17,400 million for the A4500 Mobile. Die size is 609 mm² versus 392 mm². The L20’s base clock is 1440 MHz and boost is 2520 MHz; the A4500 Mobile runs at 930 MHz base and 1500 MHz boost. The L20 has 11,776 shading units, 368 TMUs, 128 ROPs, 92 RT cores, and 368 tensor cores. The A4500 Mobile has 5,888 shading units, 184 TMUs, 96 ROPs, 46 RT cores, and 184 tensor cores.

Memory differs: the L20 has 48 GB GDDR6 on a 384 bit bus, with 2250 MHz memory clock (18 Gbps effective) and 864.0 GB/s bandwidth. The A4500 Mobile has 16 GB GDDR6 on a 256 bit bus, at 2000 MHz (16 Gbps effective) and 512.0 GB/s bandwidth. Pixel rate is 322.6 GPixel/s for the L20 versus 144.0 GPixel/s for the A4500 Mobile. Texture rate is 927.4 GTexel/s versus 276.0 GTexel/s. FP32 and FP16 are both 59.35 TFLOPS for the L20, and 17.66 TFLOPS for the A4500 Mobile.

Power and physical specifications diverge completely. The L20 has a TDP of 275 W, is dual-slot, uses a 16-pin power connector, and requires a 600 W suggested power supply. It measures 267 mm long and 111 mm tall. The A4500 Mobile has a TDP of 140 W, no slot width, no power connectors, no suggested PSU, and no recorded dimensions. The L20’s display outputs are 4x DisplayPort 1.4a, while the A4500 Mobile’s are “Portable Device Dependent”. The L20 is from the “Server Ada (Lxx)” generation and the A4500 Mobile from “Ampere-MW (Ax000)”. Release dates are 2023-11-15 for the L20 and 2022-03-21 for the A4500 Mobile. The L20 is still active, while the A4500 Mobile is end-of-life. The A4500 Mobile’s predecessor is “Quadro Turing-M” and its successor is “Ada-MW”, while the L20’s predecessor is “Server Ampere” and successor is “Server Hopper”. Neither card has a recorded launch MSRP. Both support PCIe 4.0 x16, DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, which are the only major specification areas where they agree.