Dual RTX 3090 local LLM builds depend heavily on cooling
The setup is a workstation with two RTX 3090 s. The current parts are an ASUS Crosshair VIII Hero X570 and one Gainward Phoenix RTX 3090. A second used RTX 3090 will be added, and both cards will be limited to about 250 watts each.
The target case and fan budget is under 200 euros, with some room to stretch if needed. The case options are Fractal North XL Mesh, Meshify XL 2, and Lian Li O11D EVO. The main concern is heat, because two large s may sit very close together and run hot during long or training jobs.
One option is mounting the second card vertically with a , but stability and s are still open questions.
Key points
- The planned machine uses two RTX 3090 cards for work.
- Both cards would be power-limited to about 250 watts each.
- The case shortlist is Fractal North XL Mesh, Meshify XL 2, and Lian Li O11D EVO.
- The main risk is high GPU during long or training runs.
- A vertical second GPU using a is being considered.