You dont have to build a Threadripper rig with only 2-3 GPUs.
A frew weeks ago i build a 3x4090 (NonBlower) Aircoold 19" rig,....price limit was 7.500€ i took a 9950XCPU with an ASUS B650 Creator Board, All cards with PCI-x16->x16 Riser. On the electric side 2x PCI 4.0x8 1x PCI 4.0x4.
Everything works well with max temperature of <75 °C with Noctua industrial fans. (ambient temperatur perhabs ~15C,... server room)
A frew weeks ago i build a 3x4090 (NonBlower) Aircoold 19" rig,....price limit was 7.500€ i took a 9950XCPU with an ASUS B650 Creator Board, All cards with PCI-x16->x16 Riser. On the electric side 2x PCI 4.0x8 1x PCI 4.0x4.
Everything works well with max temperature of <75 °C with Noctua industrial fans. (ambient temperatur perhabs ~15C,... server room)