An "RTX 4090" in a laptop is not an RTX 4090. It has 16 GB of VRAM instead of 24, and runs at a fraction of the power. For local AI that first difference matters most, because memory decides what you can load at all.
Same name, less memory
NVIDIA lists the RTX 4090 Laptop GPU with 16 GB and the RTX 5090 Laptop GPU with 24 GB; their desktop namesakes have 24 and 32 GB. Lower down the range the pattern continues: most RTX 4060, 4070, 5060 and 5070 laptops have 8 GB. In April 2026 NVIDIA added a 12 GB version of the RTX 5070 Laptop GPU — if you are shopping for AI, that variant is worth hunting for.
| Laptop GPU | VRAM | Power range | Models that run well |
|---|---|---|---|
| RTX 5090 Laptop 24 GB | 24 GB | 95–150 W | 43 |
| RTX 4090 Laptop 16 GB | 16 GB | 80–150 W | 25 |
| RTX 5080 Laptop 16 GB | 16 GB | 80–150 W | 25 |
| RTX 4080 Laptop 12 GB | 12 GB | 60–150 W | 17 |
| RTX 5070 Laptop 12 GB | 12 GB | 50–100 W | 17 |
| RTX 5070 Ti Laptop 12 GB | 12 GB | 60–115 W | 17 |
| RTX 4060 Laptop 8 GB | 8 GB | 35–115 W | 8 |
| RTX 4070 Laptop 8 GB | 8 GB | 35–115 W | 8 |
| RTX 5050 Laptop 8 GB | 8 GB | 35–100 W | 8 |
| RTX 5060 Laptop 8 GB | 8 GB | 45–100 W | 8 |
| RTX 5070 Laptop 8 GB | 8 GB | 50–100 W | 8 |
| RTX 4050 Laptop 6 GB | 6 GB | 35–115 W | 7 |
Out of 49 models. Calculated with the same rule as desktop GPUs. Power ranges from NVIDIA.
The power limit decides the speed
Laptop makers choose how much power the GPU may draw, anywhere inside NVIDIA's range, and often do not print it on the spec sheet. Notebookcheck found a 140 W RTX 3070 Laptop beating RTX 3080 laptops set to lower power. For image generation that means two laptops with the same GPU can differ a lot in seconds per image. It does not change what fits.
Practical tips
- Plug in and use the maker's performance mode; on battery the GPU is held back hard.
- Keep it cool. Long video renders will hit thermal limits; a stand that lifts the back helps.
- Check system RAM too. Many laptops ship with 16 GB, which is tight for FLUX-class models. 32 GB is the comfortable minimum.
- If you are choosing between two laptops, pick more VRAM over a higher GPU tier. An 8 GB laptop has to compress or stream what a 12 GB one holds entirely, no matter how fast it is.
All 32 laptop GPUs and what they run →
Sources
- Same name, less VRAM and power: NVIDIA lists the GeForce RTX 4090 Laptop GPU at 16 GB GDDR6, 256-bit, 80–150 W. The desktop GeForce RTX 4090 is 24 GB … www.nvidia.com →
- The pattern continues with Blackwell. NVIDIA lists the RTX 5090 Laptop GPU at 24 GB GDDR7, 256-bit, 95–150 W. The desktop RTX 5090 is 32 GB GDDR7, 512… www.nvidia.com →
- Notebookcheck on Ampere: compared with the desktop RTX 3080, the RTX 3080 Laptop drops from 8,704 to 6,144 shaders and from a 320-bit to a 256-bit mem… www.notebookcheck.net →
- Notebookcheck found that a 140 W RTX 3070 Laptop (Schenker XMG Neo 17) outperformed its RTX 3080 laptops in synthetic benchmarks: 'ostensibly slower G… www.notebookcheck.net →
- Notebookcheck: 'OEMs are also free to configure Ampere Laptop GPUs across a range of total graphics power (TGP) values', these details 'are not necess… www.notebookcheck.net →
- NVIDIA still publishes wide power ranges for current laptop GPUs, e.g. RTX 5090 Laptop 95–150 W, RTX 5070 Laptop 50–100 W, RTX 5050 Laptop 35–100 W. T… www.nvidia.com →