I have ordered one of the 100mm ones as a stop gap until I can send mine to spec R, I can monitor the temps and see if they are within acceptable levels and always sell it on when I upgrade, I am sure it will be better than my RS500 cooler and allows a bit more room to spin the air filter over and have it sucking in cold air through the grill. I may experiment with sealing the rest off with rubber or flexi carbon sheet.