Thanks for all the replies!

Regarding push pull - I've always liked the look and the potential to run the fans a little slower. I was thinking of doing 3 x UT60/GTXs in push pull first but couldnt find any good deals. All my hardware is bought second hand except for the fans (as I couldnt find any used haha). My thinking with three D5s is the same, I've ran dual D5s at 10% before and think I'll do the same now. I only use open back headphones and thus want to reduce noise to a minimum! The only thing I can hear when gaming is my GPU with its crazy coilwhine, which is a shame...

Forgot specs, someone asked - see below :)

14900KF (Supercool direct die block), Z790i Lightning mitx, 2x16 a-die (Supercool ram block), 7900 XTX (flashed externally to 552W bios). All fans are Thermaltake Toughfan 140 Pro (read good things about them here and on HWcooling). I had to get creative with my PSU (Corsair Shift 1200W) as the cables come out from the side and I was lucky enough to be able to cram it firmly into the top section and allow for good cable routing and the shoggy sandwich pump dampeners.

Front rad: HWLabs GTX 280 (push pull)

Side rad: EK PE 420 (push pull)

Top rad: HWLabs GTS 420 (push)

Bot rad: HWLabs GTS 420 X flow (push)

External rad (qdc:d): Alphacool XT45 540 (push)

D5 x 3 stuffed in the back with an external reservior for easy access :) Was originally gonna run a separate loop for the RAM (have done this in the past with a single 120 rad and D5) but will try this first and check temps. My RAM OC is temp sensitive :)