SLI + Beast Fan = Overdrawn?

Current set up:

Kingwin 1000w PSU powering:
X6 1055T
2 GTX 460's
2 SSDs, 1 HDD
6 case fans (~1500 RPM)

No power problems with the above. I recently order this beast of a fan to replace the back exhaust (mostly just to see what it could do, knowing that I probably wouldn't put up with the noise eventually). Snapped in the molex with the computer live so I could spy on the temps in real time, only to find my keyboard and mouse stopped working properly (or not at all) a few seconds later. Unplugging it for a while saw things back to normal, while plugging it back in again caused mouse and keyboard failure once more. This was my first build a few months ago so I'm not that knowledgeable, but I can only imagine this is a power related problem considering how powerful the fan is. I like to think I would be seeing symptoms far earlier if adding what seems like 30 or so watts to the system would lead to this, so my only guess is that it's voltage related.

So, I end up reading a bunch of stuff about the 12v rail and whatnot, but an electrical engineer I clearly am not. I am on the right track? Any insight into the matter? Anyone experience a similar situation? Does anyone else find it quite amusing that a jet-engine of a case fan might be overdrawing my system?
7 answers Last reply
More about beast overdrawn
  1. What fan is it? The Tornado?

    What PSU do you have also?

    Could be the fan trying to draw a 24v current on a 12v rail.
  2. Thanks for showing interest. Both the PSU and fan are hyperlinked in my post, but here again:

    Fan is 1ST PC CORP. PFB1212UHE-F00
    Description from
    3 bare wire or 4-pin Rated Voltage : 12V Operating Voltage Range : 8 ~ 13.2V Rated Current: 4.80 amp Rated Input Power: 48W Air Pressure: 35.877 mm H²O

    PSU is KINGWIN Lazer LZ-1000 1000W Modular 80 PLUS BRONZE
  3. you have plenty of power so I don't believe that is the issue. it could be a bad molex connection on the male or female side. try playing around with it on other free connections and see if you can repeat the problem.

    frankly you have enough power to run three GTX 460s

    edit: 68dBA.....i hope you bought ear plugs for yourself....and anyone that lives within shouting distance..... :lol:
  4. ^4 actually.

    What connectors are you using for the fan? A modular molex? Try switching to another modular plug and see if the problem still persists.
  5. The Fan pulls about 5 amps, which is a lot for a molex. You may have too much on that rail, switch connectors.
  6. I figured as much. I was trying to save space by using one modular plug for as much as possible, and this fan fills up the last connection on it. Trying it on it's own plug was the next step I thought I'd take, and from all the advice so far that should do it.

    I'll report back later.
  7. So far, regardless of what modular plug I'm using, I can only run the beast fan by itself with no other fans, and even then there's slight system lag every now and then. Just plugging in one other fan starts the real problems.

    So for now I'm stumped, but I'll try it again later today when my fan controller comes in, seeing if I can drop it down to a lower voltage.
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