I haven't done it yet but i've got the waterblock ordered which will attach to the back plate of the gpu. I'll post up once i receive this and begin the procedure.@Jay85 Nice build! (apologies if I missed this in amongst your posts) but what waterblock are you running on your 3090? I noted that you also water cooled the backplate side of the card too - how was that achieved?
Edit: I'm running an alphacool Waterblock