HP p4500 G2 storgage server fan issue

[Fatfrog50]

hi, anybody had any luck to convert hp server 6 pin fans to PWM low noise 4 pin fans. I have this old hp 4500 g2 servers, with 8 redundant fans, that is laud as a fighter plane, it should work with only 4 fans with less load, I try out 4 fan setup, but it stops and powers down.

I have read, that I can short out the blue wire whit 100 ohms and to 0. but do I need to do it with all six-pin connectors on the motherboard ?? ore how?

my goal is to water cool the 2 CPU's and connect six low noise fans to the motherboard, in a new case. but I do not have any luck yet

regards.