L40S vs RTX 4090
Head-to-head specifications
| Metric | L40S | RTX 4090 | Difference |
|---|---|---|---|
| 3DMark Time Spy | 32,060 | 33,032 | -2.9% |
| Avg FPS @ 1080p | 234 | 240 | -2.5% |
| Avg FPS @ 1440p | 148 | 153 | -3.3% |
| Avg FPS @ 4K | 84 | 87 | -3.4% |
| FP32 compute (TFLOPS) | 91.6 | 82.6 | +10.9% |
| VRAM | 48 GB GDDR6 | 24 GB GDDR6X | — |
| Memory bandwidth (GB/s) | 864 | 1,008 | -14.3% |
| TDP (W) | 350 | 450 | — |
| Stable Diffusion (it/s) | 36.6 | 33.0 | +10.9% |
| LLM inference (tokens/s) | 53 | 80 | -33.8% |
- RTX 4090 averages 153 fps at 1440p versus 148 fps — about 3% faster.
- L40S draws less power (350W vs 450W).
Verdict: L40S or RTX 4090?
L40S advantages
- Video memory (+50%)
- AI image generation (+10%)
- Power efficiency (+22%)
RTX 4090 advantages
- Memory bandwidth (+14%)
- Local LLM inference (+34%)
Which should you choose?
- Choose the L40S if you play the latest titles at high textures or do GPU-accelerated work.
- Choose the RTX 4090 if you work with high-resolution textures or memory-bound workloads.
- Choose the L40S if you run AI image generation locally.
L40S vs RTX 4090: which should you choose?
L40S — NVIDIA desktop graphics card (2023, Ada Lovelace) with 48 GB of GDDR6, averaging 148 fps at 1440p.
RTX 4090 — NVIDIA desktop graphics card (2022, Ada Lovelace) with 24 GB of GDDR6X, averaging 153 fps at 1440p; launched at $1,599.
L40S vs RTX 4090: RTX 4090 is faster for gaming. RTX 4090 averages 153 fps at 1440p versus 148 fps — about 3% faster. L40S draws less power (350W vs 450W).
1080p, 1440p and 4K
At 1440p — the most common enthusiast resolution — the RTX 4090 averages 153 fps against 148. At 4K (84 vs 87 fps) VRAM (48GB vs 24GB) and memory bandwidth matter more.
AI and creator workloads
Beyond gaming, the L40S is quicker for AI image generation (36.6 vs 33.0 it/s in Stable Diffusion) and local LLM inference (80 vs 53 tokens/s), which increasingly matters for creators and developers.
Power and value
Board power is 350 W versus 450 W, which affects PSU headroom, case cooling and noise.
The verdict
Both are credible choices in the graphics card comparison space; the specification table above lays out every metric so you can weigh the trade-offs that matter to you. Pick the one whose strengths line up with how you will actually use it.
Frequently asked questions
Is the L40S better than the RTX 4090?
L40S takes the overall edge, though RTX 4090 wins in specific areas worth weighing. RTX 4090 averages 153 fps at 1440p versus 148 fps — about 3% faster.
What is the main difference between the L40S and the RTX 4090?
RTX 4090 averages 153 fps at 1440p versus 148 fps — about 3% faster. L40S draws less power (350W vs 450W).
Which should I choose?
Choose the L40S if you play the latest titles at high textures or do GPU-accelerated work. Choose the RTX 4090 if you work with high-resolution textures or memory-bound workloads.
Methodology
Graphics cards are compared on 3DMark Time Spy scores, average gaming frame rates at 1080p/1440p/4K, FP32 compute throughput, VRAM capacity and type, memory bandwidth, board power (TDP) and launch MSRP — plus AI workload throughput (Stable Diffusion iterations/s and local LLM tokens/s) where measured. Vintage and server GPUs without modern benchmark results are compared on specifications only, clearly labelled. Frame rates are averages across a game suite at high settings; specific titles vary.