Help testing Corsair AX750

95thrifles · 10 Nov 2011 at 12:09

Hi guys

As a lot of you will be aware I'm doing rebuild, now I've already got my PSU, the above, but as I'm sending my case off for modding it wont be for a coupla weeks til I actually do new build. Now at present I am running old rig outside case, rig is sat on desk. Figured I'd check PSU now rather than wait another coupla weeks then test it and find dreaded DOA or something then have issues with time lapsed etc. So anyway I hooked it up n powered up and all is running fine, tried a quick spot of gaming & I've run IBT+furmark to stress system, no issues with current system coping, however the fan on the PSU is not spinning, it spins up briefly on initial power on then stops, figured this is part of its hybrid fanless system, where it doesnt spin below 20% load, but surely gaming/IBT+furmarks gonna push it over 20%? Only thing I can think is cos its sat on desk its not getting hot? But it doesnt mention anywhere about the fanless system being related to temp, just load.
So anyone any ideas? Or anyone got this, or one of other models able to confirm if theres does same? Dont want to wait 2/3 weeks til got new system then find the fans faulty on the unit and have difficulties RMAing cos of time lapsed

Current system is [email protected]/6 cant recall ATM and a 560, surely enough to be over that 20% threshold

95thrifles · 10 Nov 2011 at 12:16

Ahh nvm, after more gaming its going now, must be partially linked to temp even though its not stated any where, I'll leave this up in case anyone ever gets same query

Plec · 10 Nov 2011 at 12:18

Hi Thriffles

The fan may only in kick through temp change rather than load - and as it's outside of the case that may explain its lack of activity:

Corsair said:
•An ultra-quiet 120mm double ball-bearing fan delivers excellent airflow at an exceptionally low noise level by varying fan speed in response to temperature

linkk

95thrifles · 10 Nov 2011 at 12:29

cheers mate, missed that bit, I was looking on next page at tech specs n seeing the charts n stuff
no worries

Sasahara · 10 Nov 2011 at 13:33

I think even the corsair site has it wrong, well partly.

It has the correct spec in the Tech Spec tab

"The Corsair AX750's energy-efficient design allows it to operate reliably with minimal cooling, and hence very low noise levels. The AX750's Hybrid Silent Fan Control technology offers three modes of cooling, depending on the load level. This includes a fanless mode of operation (0 rpm) up to about 20% load, a quiet, low fan speed cooling mode for typical loads up to around 50% load, and a higher performance cooling mode for more demanding loads"

And I can pretty much vouch for this as I had a faulty AX850 that got really hot when it wasn't at 20% and the fan didn't run, it only started when under load. If it was temp based it would have started up.

It's replacement doesn't get anywhere near that hot and the fan kicks in only when it was underload, but still a lot cooler than the faulty one.

I believe there is a patent for temperature controlled fan startup on a computer PSU, so they'd have to pay extra for that.

Sasahara · 10 Nov 2011 at 13:38

Thinking about it, the temperature thing might be for fan speed after the fan has started, that would make sence, aka the cooling mode.

Avathar77 · 10 Nov 2011 at 13:49

I got AX850 couple of days ago and this still kinda worries me!
My one is sitting outside with out a case as well and still can't check with dedicated GPU so not sure how it will turn out!