Z640 Fan speed is quite too hight and so noisy

Hello,

We have purchased 2 workstations Z640 in March 2017 and they look quite impressive.

However we have a problem:

The 2 workstations fans speed is quite high and then noisy.

we have seen some bug reports about fan speed - fixed by bios update -:

https://h30434.www3.hp.com/t5/Business-PCs-Workstations-and-Point-of-Sale-Systems/Z640-made-great-noise-with-32GB-DDR4-RAM/m-p/5992673/thread-id/15877?device-view=desktop

But even with most up to date BIOS version 2.32 (April 10 2017), the problem still occurs.

We have 32Gb RAM (2*16gb).

We plan to buy another Z640 workstations but if the fan are too noisy, it could be compromised.

Any help would be appreciated.

Best regards...

Christophe