NVIDIA GeForce RTX 4090 D vs NVIDIA L4 Comparison

The NVIDIA GeForce RTX 4090 D is the dominant performer in this comparison, decisively outperforming the NVIDIA L4 in every shared benchmark by nearly double. However, the L4 is a specialized server accelerator with a radically different design focus, trading raw compute for extreme efficiency and a compact form factor. The data shows that while the RTX 4090 D wins on sheer speed, the L4 wins on operational flexibility and power economy.

Head-to-Head Benchmarks

The benchmark data is unambiguous: the GeForce RTX 4090 D leads the L4 by a massive margin in all available tests. In the Geekbench OpenCL test, the RTX 4090 D scores 278,621 points against the L4’s 140,838, a delta of 97.8% — essentially doubling the L4’s output. The Geekbench Vulkan result is even more lopsided: the RTX 4090 D scores 246,941, while the L4 manages 121,306, representing a 103.6% advantage. To contextualize, the RTX 4090 D’s average benchmark score is 178,050, placing it in the 98th percentile of all GPUs, while the L4’s average of 131,072 puts it in the 95th percentile. The RTX 4090 D wins both head-to-head tests; the L4 has zero wins.

The RTX 4090 D’s nearest rivals in the database are all professional-grade cards: the RTX PRO 5000 Blackwell (182,109 avg score, -2.2% delta), the A100 SXM4 80 GB (183,725, -3.1%), and the RTX 5000 Ada Generation (184,664, -3.6%). This positioning shows the 4090 D competes at the upper echelon of workstation compute, not just consumer gaming. The L4, by contrast, sits near the GeForce RTX 3090 Ti (131,938 avg, -0.7% delta) and the RTX 4000 Ada Generation (135,218, -3.1%), indicating its performance class is roughly that of a previous-generation high-end card, not a current flagship.

FAQ

Q: Which card has the higher raw compute throughput?

A: The RTX 4090 D. It delivers 73.54 TFLOPS FP32 and 73.54 TFLOPS FP16 (1:1), versus the L4’s 30.29 TFLOPS in both formats. This makes the 4090 D roughly 2.4x faster in theoretical compute.

Q: What is the power consumption difference?

A: The RTX 4090 D has a TDP of 425 W and requires an 800 W suggested PSU. The L4 has a TDP of just 72 W and a 250 W suggested PSU — a difference of 353 W in thermal design power.

Q: Do both cards support the same APIs?

A: Yes, they are identical in API support. Both feature DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: Which card has more memory bandwidth?

A: The RTX 4090 D. It has 1.01 TB/s bandwidth via a 384-bit bus with GDDR6X, while the L4 offers 300.1 GB/s on a 192-bit bus with GDDR6.

Q: What is the physical size difference?

A: The RTX 4090 D is a triple-slot card measuring 304 mm in length, 137 mm in height, and 61 mm in width. The L4 is a single-slot card at 169 mm long and 56 mm high, with no listed width.

Q: Are both cards currently in production?

A: No. The RTX 4090 D is marked as end-of-life, while the L4 is listed as an active product.

Architecture Differences

Both cards are built on NVIDIA’s Ada Lovelace architecture and use a 5 nm TSMC process, but they employ vastly different chips. The RTX 4090 D uses the full-scale AD102 die, packing 76,300 million transistors onto a 609 mm² die with a transistor density of 125.3M / mm². The L4 uses the smaller AD104 chip, which contains 35,800 million transistors on a 294 mm² die (121.8M / mm²). This means the 4090 D has more than double the transistor count and double the physical area.

The compute resources diverge sharply. The RTX 4090 D features 14,592 shading units, 456 TMUs, and 176 ROPs, along with 114 RT cores and 456 Tensor Cores. The L4 has 7,424 shading units, 240 TMUs, and 80 ROPs, with 60 RT cores and 240 Tensor Cores — roughly half the resources in every category. The memory subsystems also differ fundamentally: the 4090 D uses 24 GB of GDDR6X on a 384-bit bus, while the L4 uses 24 GB of GDDR6 on a 192-bit bus. The 4090 D’s pixel rate is 443.5 GPixel/s and its texture rate is 1,149.1 GTexel/s, versus the L4’s 163.2 GPixel/s and 489.6 GTexel/s.

The clock speeds tell a story of different priorities. The RTX 4090 D runs at a base of 2280 MHz and boosts to 2520 MHz, with memory at 1313 MHz (21 Gbps effective). The L4 has a much lower base clock of 795 MHz but boosts to 2040 MHz, with memory at 1563 MHz (12.5 Gbps effective). The L4’s low base clock suggests aggressive power-saving behavior under idle or light loads, while the 4090 D stays closer to its peak frequency.

Specification Differences

The two cards diverge on nearly every measurable specification. The RTX 4090 D has a base clock of 2280 MHz versus the L4’s 795 MHz, and a boost clock of 2520 MHz versus 2040 MHz. Memory type differs: GDDR6X on the 4090 D versus GDDR6 on the L4. The bus width is 384-bit versus 192-bit. Bandwidth is 1.01 TB/s versus 300.1 GB/s. Shading units are 14,592 versus 7,424. TMUs are 456 versus 240. ROPs are 176 versus 80. RT cores are 114 versus 60. Tensor cores are 456 versus 240.

Pixel rate is 443.5 GPixel/s versus 163.2 GPixel/s. Texture rate is 1,149.1 GTexel/s versus 489.6 GTexel/s. FP32 and FP16 compute are 73.54 TFLOPS versus 30.29 TFLOPS. TDP is 425 W versus 72 W. Slot width is triple-slot versus single-slot. The 4090 D has a 1x 16-pin power connector; the L4 has none. Suggested PSU is 800 W versus 250 W. Display outputs: the 4090 D has 1x HDMI 2.1 and 3x DisplayPort 1.4a; the L4 has no outputs. Dimensions: 304 mm x 137 mm x 61 mm versus 169 mm x 56 mm (no width listed). The 4090 D launched at 1,599 USD MSRP; the L4 has no listed MSRP. Transistor count is 76,300 million versus 35,800 million. Die size is 609 mm² versus 294 mm².

The Verdict

The data is clear: the RTX 4090 D is the superior choice for anyone who needs maximum compute performance, and it wins both head-to-head benchmarks by roughly 100%. Its 73.54 TFLOPS FP32 output, 1.01 TB/s bandwidth, and 98th-percentile ranking make it a top-tier card for heavy rendering, AI training, or scientific workloads. The L4, however, is not a failure — it is a different tool. Its 72 W TDP and single-slot design make it ideal for dense server deployments where power and space are at a premium, and its 95th-percentile standing is still strong. The L4’s 30.29 TFLOPS and 300.1 GB/s bandwidth are respectable for a card that draws a fraction of the power.

Choose the RTX 4090 D if your workload is performance-bound and you have the physical space and power budget for a 425 W, triple-slot card. Choose the L4 if you need to fit many accelerators into a single chassis, require passive cooling, or have strict power limits — the L4’s 72 W TDP means it can be deployed where the 4090 D would be impossible. The RTX 4090 D is end-of-life, while the L4 remains active, which matters for long-term procurement.

Where Each One Wins

The RTX 4090 D wins in every performance metric: raw compute (2.4x FP32), memory bandwidth (3.4x), pixel fill rate (2.7x), and texture rate (2.3x). It wins the OpenCL benchmark by 97.8% and Vulkan by 103.6%. It is the clear choice for desktop workstations, high-end gaming rigs, or any environment where maximum throughput is the sole objective. Its 24 GB of GDDR6X memory provides ample capacity for large datasets, and its triple-slot cooling can handle sustained high loads.

The NVIDIA L4 wins in efficiency and deployment flexibility. Its 72 W TDP is 83% lower than the 4090 D’s 425 W, and its single-slot, 169 mm length allows for far denser server configurations. It has no power connector requirement, simplifying cabling. It has no display outputs, confirming its purpose as a compute-only accelerator for data centers. While it loses on performance, its 95th-percentile ranking shows it is still capable, and its active production status ensures ongoing availability. For inference workloads, video transcoding, or virtualized environments where many GPUs must share a power budget, the L4 is the superior choice — the benchmark gap is real, but the operational advantages are decisive in the right context.