On Fri, Jul 17, 2015 at 7:07 AM, Abel Abraham Camarillo Ojeda <[email protected]> wrote:
> The PSU of the T1000 uses '4-connector' fan, as far as I know - and I know > very little after trying to hack into this PSU to make it's fan do less noise > - > the fourth connector is used for 'sending rotating speed', so I tried to > make it do a lot less noise by under voltaging it, like all other fans in the > T1000 (3 pin fans) but the PSU and the System Controller detects that > the fan isn't rotating at the speed it told it to do and after three tries > the PSU shuts down and _bricks_ itself, giving you a nice message in SC > telling you to 'PSU: fan problem, replace FPU' - or something like that... This looks optimistic. So SC is meassuring only PSU's fan speed and not front fans speeds? Have you tried to completely unconnect front fans and see what happen? On the other hand it looks like PSU may be more complex. but well, even standard ATX PSU communicates its fan speed to the board so the chance is still here. > I fix the heating problem by opening the case, putting a piece of paper in > the chassis sensor and dedicating a 40cm diameter standing fan to cool > my T1000... - having its integrated (except PSU) fans undervoltaged So how your modified T1000 sounds then? What exactly have you used to undervolt front fans? Diodes? To what voltage you got by it still to have fans rotating? >>> One last remark: this machine features neither USB nor optical drive >> >> No USB? Hmm, that means no keyboard nor mouse so no workstation but >> still possible silent server. >> > > You use serial to admin it... Yes, that was just a remark about possible workstation usage and by workstation I mean also with GPU/keyboard/mouse so have SPARC doing whole firefox/thunderbird/X work. I can still use remote X access indeed. Thanks a lot for your information! Karel
