L40S vs RX M 6400
Head-to-head specifications
| Metric | L40S | RX M 6400 | Difference |
|---|---|---|---|
| 3DMark Time Spy | 32,060 | 1,272 | +2,420.4% |
| Avg FPS @ 1080p | 234 | 28 | +735.7% |
| Avg FPS @ 1440p | 148 | 15 | +886.7% |
| Avg FPS @ 4K | 84 | 8 | +950.0% |
| FP32 compute (TFLOPS) | 91.6 | 3.0 | +2,923.1% |
| VRAM | 48 GB GDDR6 | 4 GB GDDR6 | — |
| Memory bandwidth (GB/s) | 864 | 112 | +671.4% |
| TDP (W) | 350 | 34 | — |
- L40S averages 148 fps at 1440p versus 15 fps — about 887% faster.
- RX M 6400 draws less power (34W vs 350W).
Verdict: L40S or RX M 6400?
L40S advantages
- 1440p gaming (+90%)
- 4K gaming (+90%)
- Synthetic benchmark performance (+96%)
- Video memory (+92%)
- Memory bandwidth (+87%)
RX M 6400 advantages
- Power efficiency (+90%)
Which should you choose?
- Choose the L40S if you game at 1440p.
- Choose the RX M 6400 if you want lower power draw, heat and noise.
- Choose the L40S if you game at 4K or drive a high-resolution display.
L40S vs RX M 6400: which should you choose?
L40S — NVIDIA desktop graphics card (2023, Ada Lovelace) with 48 GB of GDDR6, averaging 148 fps at 1440p.
RX M 6400 — AMD desktop graphics card (2022, RDNA 2) with 4 GB of GDDR6, averaging 15 fps at 1440p.
L40S vs RX M 6400: L40S is faster for gaming. L40S averages 148 fps at 1440p versus 15 fps — about 887% faster. RX M 6400 draws less power (34W vs 350W).
1080p, 1440p and 4K
At 1440p — the most common enthusiast resolution — the L40S averages 148 fps against 15. At 4K (84 vs 8 fps) VRAM (48GB vs 4GB) and memory bandwidth matter more.
Power and value
Board power is 350 W versus 34 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 RX M 6400?
L40S is the clearly stronger overall choice, winning most of the dimensions that matter. L40S averages 148 fps at 1440p versus 15 fps — about 887% faster.
What is the main difference between the L40S and the RX M 6400?
L40S averages 148 fps at 1440p versus 15 fps — about 887% faster. RX M 6400 draws less power (34W vs 350W).
Which should I choose?
Choose the L40S if you game at 1440p. Choose the RX M 6400 if you want lower power draw, heat and noise.
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.