Ooo yes. I agree that PBO doesnt yield the best results looking at clocks vs heat, but its the only way to combine 1T and all core OC without having to manually switch profiles all the time depending on your workload. Also, with the power limit set in PBO you can control the heat generated by the CPU prety well. For example; running prime95 (small FTT) generates an absolute shitload of heat. Compared to a stable cinebench run, i need to up the voltage from 1,05 to 1.125V (using manual OC), but with PBO and a fixed power limit it just reduces the clock speed. At this moment I'm running with a 160W limit and that seems to give OK temps/clocks (65C during gaming and ~4.2 ghz all core in cinebench).
Bubbles are almost completely elimitated. I use a vacuum pump and a long tube connected to one of the ports on the rad and 'guide' all air pockets to the outlet by rotating/shaking the complete pc. There's still a very small 'dead' pocket, but no circulating air thanks to a low pump speed (20-25% pwm).
Given that I can run very low fan rpm with just the CPU in the loop gives me some hope adding the 3090 will not have a huge impact on cpu temps, as long as the additional heat generated can be dissipated by upping the fan rpm to keep water temp under control. I have a temp sensor in backorder to be able to monitor water temps and controlling fan speed.
I never thought Ali would be able to have a working setup with just 1 rad, so i wasnt surprised with the temps he is seeing. Thats a whole different bottleneck limiting his system
Anyways, all I want to say is that I believe there's more performance to be had with a better cold plate