you still have to get more cooling on yours.
to run in the 5's makes lots of heat and to do it on all 8 really takes some cooling.
into the 5's for mine take a 4x120 thick phobia g changer, mine tops out, for me, at 5.4 and takes a 4x180 rad to do that but Rgone had it at 5.6 on chilled water. mine has now retired to being a file server that hangs on the wall at 5.2 24x7.