Replace Fan on Corsair HX620

mattyfez said:
Yeh I thought about sourcing a suitable fan but it was proving difficult to figure out what I wante
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The ad1212hb-a71gl is a 120mm, 2200rpm non-PWM fan and will pull 0.37amps. replace it with something similar if you want to keep it powered internally or like andiarial said any 120mm fan will do if y6ou want to power it with a molex, for example. You can just feed the fan cable through the back of the psu where the main atx cable exits.
 
Yeh, I've ordered a new PSU now though, the 620 certainly gave it's monies worth. don't want to go too ghetto with it. the dust inside the PSU casing was pretty impressive too (my fault as the PC stits against a wall and it's ot had one side panel on for some time.!

Not sure why the silent wings fan wouldn't spin up, maybe it had to be non PWM which the silent wings was, but i was only using the Ground and +12v fan cable. the silent wings fan is rated at 0.20A, and lower 1500RPM, so I guessed if anything it would be working too hard... maybe it's something about PWM fans The PSU didn't agree with, although as I said, I only connected ground and +12v wires.
 
It's not just what the fan normally pulls in operation however, most typical fans we can source for ourselves actually pull a lot more than what they list for their rating, and that's why you only saw your fans twitch a bit on start up. They are getting power, just not enough to power them. The header inside the PSU simply doesn't provide the oomph required to power most typical aftermarket fans.

That's why I said you needed to power it externally to the PSU, although in my read up scenario, it was via the motherboard. Although via molex as others have said is viable too. Just the motherboard is controllable.
 
Meddling-Monk said:
It's not just what the fan normally pulls in operation however, most typical fans we can source for ourselves actually pull a lot more than what they list for their rating, and that's why you only saw your fans twitch a bit on start up. They are getting power, just not enough to power them. The header inside the PSU simply doesn't provide the oomph required to power most typical aftermarket fans.
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That wont be the case. standard fan pulls 4.5w at 12w and we know the psu will be built to deal with that. The psu is probably most likely expecting the fan to respond to a voltage too low for replacement fan he tried. Fans that spin slower at 12v (standard unit is a 2200rpm fan dont forget) tend to need a higher voltage to get going.
 
james.miller said:
That wont be the case. standard fan pulls 4.5w at 12w and we know the psu will be built to deal with that. The psu is probably most likely expecting the fan to respond to a voltage too low for replacement fan he tried. Fans that spin slower at 12v (standard unit is a 2200rpm fan dont forget) tend to need a higher voltage to get going.
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Ummm... That's what I said? :p

"why you only saw your fans twitch a bit on start up", not enough power on start up to get going.
 
Not really, no. You said :

"The header inside the PSU simply doesn't provide the oomph required to power most typical aftermarket fans."

Which isnt the case. It's not a power issue, it's a voltage issue. The psu would have started the fan if the load or internal temperature was high enough - I cant remember off hand how the fan is regulated. The point being; the psu can easily provide enough power but it's trying to start the fan with a voltage that's too low because designed to work with a fan that has a much wider voltage range. Give the psu some stick and that fan will spin just fine.
 
*shrugs* :confused:

Personally, my entire post was talking about the start-up not getting the power required to get the fans spinning on power up. Didn't say voltage, didn't say amps, just power (as in getting enough electricity to power it up during power up), but if you are talking about accuracy of statement, then yeah, I didn't say anything like that since I didn't say voltage. I personally see it as inferred from the entire post, but that's probably just me typing and not putting everything I wanted to into the post into proper sentences and structure so it doesn't read as such. But... *shrugs* that's just me. :)

Anyway, back to the OT. Not worth faffing around with the fan anymore as you've already said. If the PSU was that old already, a change is better off than just replacing the fan.
 
Ok, i guess this wasn't what you meant either then:
most typical fans we can source for ourselves actually pull a lot more than what they list for their rating, and that's why you only saw your fans twitch a bit on start up.
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You were incorrect on a number of points there, i was just making a friendly correction. But i'm bored now, so that's enough back and forth.

The header would be fine powering any normal case fan as we KNOW it's good for up to 5 watts. a 1200rpm not spinning at power up has nothing to do with the header having enough power, and it has nothing to do with the fan pulling 'more than its rating'. That's just wrong and that's my last reply to you on the subject :)
 
Well so far so good with the new PSU.

Initial observations:
  • Cable length is fine, slightly longer than those supplied with the HX620, at least the main Mobo/CPU cables are - the cpu cable on the HX was a bit of a stretch in my case.
  • The unit feels slightly lighter than the HX620, but not much, feels well built though.
  • It doesn't look too fancy, its a pretty plain looking black box, but the matte black look quite sleek and minimalist. Will fit into any case colour scheme if that's your thing.
  • The beveled edges of the casing make fitting easier if you have a tight cage/psu slot/bracket etc.
  • The semi passive fan is great, it spins up on startup so you can see it works, then just stops unless needed, PC is defiantly quieter now, although the fan on the outgoing PSU was worn out, to be fair.
  • Comes with 3 PCIE twin connectors (2x6+2 on each cable) which seems excessive, and as I only use one 6+2, I had to cable tie a plug back
  • Combined with the semi passive fan feature, the ultra light load efficiency is really good, from what I can gather it can deliver as little as 15watts (2% of the max-rated-output)? if the rest of they system doesn't call for more, which would work well with CPU power saving/down-clocking modes and GPUs that essentially go into standby if just doing desktop work.
 
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Yeh seems so from other replies too, how do you find such a fan though? most case/cpu fans just state rpm and amps on the spec
 
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Some PWM don't run with just 2 wires, the PWM channel may need to be connected to +12v via a resistor as well when there isn't an internal pull up.

Without the extra connection the requested duty cycle is 0%

Easier with a 3 pin fan where any fan can be used and the tacho signal ignored.
As long as you don't exceed the rated current on the existing fan, it will work just fine.

May be worth keeping as a spare.

My HX620 is still going strong
 
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