Intel Arc B390 vs NVIDIA L20 Comparison

Intel Arc B390 and NVIDIA L20 occupy opposite ends of the GPU spectrum, and the recorded data makes that separation explicit. The Arc B390 is an integrated graphics processor within Intel's Panther Lake chip, built for mobility and low power. The L20 is a dual-slot server accelerator built on NVIDIA's Ada Lovelace architecture, designed for compute-heavy professional workloads. The benchmark results show a chasm between them, not a contest.

Head-to-Head Benchmarks

The head-to-head benchmark table is empty, so the comparison relies on each card's individual recorded scores. The Intel Arc B390 has a single benchmark entry: 3DMark Steel Nomad DX12, where it scores 1482. That places it at the 9th percentile of all GPUs in the database. Its nearest rivals in the database are all low-end NVIDIA parts: the GeForce GT 520MX (score 1463, delta 1.3%), the GeForce 800M (score 1460, delta 1.5%), the GeForce GT 625 OEM (score 1446, delta 2.5%), and the GeForce GT 710 (score 1443, delta 2.7%). The Arc B390 beats each of these by margins between 1.3% and 2.7%. That is a narrow band of performance, and it confirms the Arc B390 sits at the very bottom of the database's performance distribution, just ahead of a group of decade-old entry-level discrete GPUs.

The NVIDIA L20 has two benchmark entries, both from Geekbench. It scores 274276 in OpenCL and 228018 in Vulkan, giving an average benchmark score of 251147. The L20 sits at the 99th percentile of all GPUs in the database, a full 90 percentile points above the Arc B390. Its nearest rivals are far more powerful: the NVIDIA PG506-232 (score 225124, delta 11.6%), the AMD Radeon PRO W7900D (score 219827, delta 14.2%), the NVIDIA L40 (score 284111, delta -11.6%), and the NVIDIA RTX 6000 Ada Generation (score 287237, delta -12.6%). The L20 leads the PG506-232 by 11.6% and the Radeon PRO W7900D by 14.2%. It trails the L40 by 11.6% and the RTX 6000 Ada by 12.6%. The L20 is not the fastest server GPU in the database, but it holds a clear mid-to-upper position among professional accelerators.

Direct score comparison between the two cards is impossible because they ran different benchmark suites. No shared test exists in the database. The 3DMark Steel Nomad result for the Arc B390 and the Geekbench results for the L20 measure different workloads, so no direct numerical delta can be calculated from the recorded data. What the data does show is the relative position. The Arc B390 sits among GPUs scoring roughly 1440 to 1480 in its benchmark, while the L20 sits among GPUs scoring roughly 220000 to 287000 in its suite. The percentile gap, 9 versus 99, is the cleanest summary of the performance separation.

The Verdict

The data points to two completely different buyers. The Intel Arc B390 is an integrated part of a Panther Lake processor, so it cannot be purchased separately and installed into a desktop. It is an IGP, meaning it shares system memory and its bandwidth is listed as "System Dependent". Its performance class, just above the GeForce GT 710 series in the database, suits basic display output and light 2D or older 3D workloads. The 9th percentile ranking means it outperforms only a small slice of the GPU population, and that slice consists of legacy low-end parts.

The NVIDIA L20 is a server accelerator with a 99th percentile ranking. Its OpenCL and Vulkan scores place it among professional compute GPUs, ahead of the PG506-232 by 11.6% and ahead of the Radeon PRO W7900D by 14.2%. It trails the L40 and RTX 6000 Ada, but those are higher-tier parts in the same professional family. The L20 is a dual-slot card, 267 mm long, with a 16-pin power connector and a 600 W suggested PSU. It is built for a server chassis, not a portable device.

The Arc B390 is for a thin-and-light laptop or compact mobile system where an integrated GPU is the only option. The L20 is for a server or workstation that needs substantial compute throughput. No user would choose between them because they are not alternatives in any purchasing decision. The database confirms the L20 is in a professional performance tier, and the Arc B390 is in an entry-level integrated tier.

Architecture Differences

The two GPUs share almost nothing architecturally. The Intel Arc B390 uses the Xe3-LPG architecture on a 3 nm process node, fabricated by Intel. It is part of the Arc Graphics-M generation for Panther Lake. The chip is integrated, so there is no separate die size or transistor count in the database, and the memory subsystem is entirely system-shared. The L20 uses NVIDIA's Ada Lovelace architecture, built on a 5 nm process at TSMC. It has 76,300 million transistors on a 609 mm² die, giving a transistor density of 125.3 million per square millimeter.

The compute resources differ by an order of magnitude. The Arc B390 has 1536 shading units, 48 texture mapping units, 24 ROPs, and 12 ray tracing cores. The L20 has 11776 shading units, 368 TMUs, 128 ROPs, and 92 RT cores. The L20 also includes 368 tensor cores; the Arc B390 has no tensor core count listed. Clock speeds show a similar gap. The Arc B390 runs at a 300 MHz base and 2500 MHz boost. The L20 runs at 1440 MHz base and 2520 MHz boost. The L20's higher base clock and far larger shader count produce a massive throughput advantage: the L20 delivers 59.35 TFLOPS FP32 and 59.35 TFLOPS FP16, while the Arc B390 delivers 7.680 TFLOPS FP32 and 15.36 TFLOPS FP16 at a 2:1 ratio. Pixel and texture rates follow the same pattern. The L20 achieves 322.6 GPixel/s and 927.4 GTexel/s; the Arc B390 manages 60.00 GPixel/s and 120.0 GTexel/s.

The power and form factor difference is stark. The Arc B390 has an 80 W TDP, uses no power connector, and is an IGP with no slot width. The L20 has a 275 W TDP, requires a 16-pin connector, and is a dual-slot card. The L20 uses 48 GB of GDDR6 memory on a 384-bit bus with 864.0 GB/s bandwidth. The Arc B390 has no dedicated memory at all; its size, type, bus width, and bandwidth are all listed as system shared or system dependent.

FAQ

Q: Which GPU has the higher benchmark score?

A: The NVIDIA L20 has an average benchmark score of 251147 across its OpenCL and Vulkan Geekbench results. The Intel Arc B390 has a single 3DMark Steel Nomad DX12 score of 1482. They were tested with different benchmarks, so no direct numerical comparison exists, but the L20 sits at the 99th percentile of all GPUs while the Arc B390 sits at the 9th percentile.

Q: How does the Intel Arc B390 compare to its nearest rivals?

A: The Arc B390 leads the NVIDIA GeForce GT 520MX by 1.3%, the GeForce 800M by 1.5%, the GeForce GT 625 OEM by 2.5%, and the GeForce GT 710 by 2.7% in its recorded benchmark.

Q: How does the NVIDIA L20 compare to other professional GPUs?

A: The L20 is 11.6% ahead of the NVIDIA PG506-232 and 14.2% ahead of the AMD Radeon PRO W7900D. It trails the NVIDIA L40 by 11.6% and the NVIDIA RTX 6000 Ada Generation by 12.6%.

Q: Does the Intel Arc B390 have its own video memory?

A: No. The Arc B390 uses system-shared memory. Its memory size, type, bus width, and bandwidth are all listed as system shared or system dependent, and its memory clock is listed as system shared.

Q: What kind of power connector does the NVIDIA L20 need?

A: The L20 uses a single 16-pin power connector, has a 275 W TDP, and its suggested PSU rating is 600 W. It is a dual-slot card.

Q: What is the node size for each GPU?

A: The Intel Arc B390 uses a 3 nm process at Intel. The NVIDIA L20 uses a 5 nm process at TSMC.

Where Each One Wins

The Intel Arc B390 wins in power efficiency and integration. Its 80 W TDP requires no external power connector, and its IGP form factor means it occupies no expansion slot. It is built into the Panther Lake processor itself, so it adds no separate board footprint. The 3 nm process gives it a process advantage over the L20's 5 nm node, which is relevant for a mobile integrated part. Its boost clock of 2500 MHz is close to the L20's 2520 MHz, which indicates the small chip can reach similar frequency ceilings despite its far lower power draw.

The NVIDIA L20 wins in every raw compute category. Its FP32 throughput of 59.35 TFLOPS is roughly 7.7 times the Arc B390's 7.680 TFLOPS. Its FP16 output of 59.35 TFLOPS at a 1:1 ratio exceeds the Arc B390's 15.36 TFLOPS at a 2:1 ratio. Its 864.0 GB/s memory bandwidth is a dedicated GDDR6 implementation, versus the Arc B390's system-dependent shared memory. The L20 has 368 tensor cores for AI workloads, a feature the Arc B390 does not list. Its 48 GB of VRAM dwarfs any shared memory allocation a mobile IGP could access. The L20 also has four DisplayPort 1.4a outputs, while the Arc B390's display outputs are listed as portable device dependent.

The use cases split cleanly. The Arc B390 serves portable devices where power, heat, and space are constrained. The L20 serves servers and workstations where throughput, memory capacity, and dedicated compute features matter more than power consumption. The data does not suggest any overlap.

Specification Differences

The two cards differ in nearly every recorded field. The process node is 3 nm for the Arc B390 and 5 nm for the L20. The Arc B390 has no transistor count or die size listed; the L20 has 76,300 million transistors on a 609 mm² die. The base clock is 300 MHz for the Arc B390 versus 1440 MHz for the L20. The boost clocks are closer: 2500 MHz versus 2520 MHz. Memory is the largest gap. The Arc B390 uses system shared memory with system dependent bandwidth. The L20 uses 48 GB of GDDR6 on a 384-bit bus with 864.0 GB/s bandwidth and an 18 Gbps effective memory clock.

The compute units differ by a wide margin. The Arc B390 has 1536 shading units, 48 TMUs, 24 ROPs, and 12 RT cores. The L20 has 11776 shading units, 368 TMUs, 128 ROPs, 92 RT cores, and 368 tensor cores. The Arc B390 lists no tensor core count. Pixel rate is 60.00 GPixel/s for the Arc B390 versus 322.6 GPixel/s for the L20. Texture rate is 120.0 GTexel/s versus 927.4 GTexel/s. FP32 is 7.680 TFLOPS versus 59.35 TFLOPS. FP16 is 15.36 TFLOPS at a 2:1 ratio versus 59.35 TFLOPS at a 1:1 ratio.

TDP is 80 W for the Arc B390 and 275 W for the L20. The Arc B390 is an IGP with no power connector and no slot width. The L20 is a dual-slot card with a 16-pin connector and a 600 W suggested PSU. The bus interface is IGP for the Arc B390 and PCIe 4.0 x16 for the L20. Display outputs are portable device dependent for the Arc B390 and 4x DisplayPort 1.4a for the L20. The L20 measures 267 mm in length and 111 mm in height; the Arc B390 has no dimensions listed. Both support DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The Arc B390 was released in January 2026, and the L20 in November 2023. The L20's predecessor is Server Ampere and its successor is Server Hopper; the Arc B390 has no predecessor or successor listed.