...depends on the water cooler because of the width of the 2 or 2.5 slots and connections. If the graphics card has a standard PCB, it should work without problems if you do everything correctly with the heat conduction pads and heat conduction paste.
Hello
you need more detail to find out what is not working
I have 2 palit 2080 Ti Gaming pro OC Gigabyte NVlink and 1200watt corsair power supply and no problem in SLI mode.