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Magna PSU

I just bought a new PSU as my existing one is making an unpleasant noise when I boot up (tho not all the time - it's the classic annoying intermittent fault). The noise goes away after 15 mins or so but I thought I better get a replacement now rather than wait until it gives up on me completely.

It's a Magna ATX 500W and the design has changed a bit. Apart from the wacky clear plastic case, it now has a knob next to the on/off switch with a L --> H above it.

I received no documentation with it so can only guess that the knob controls the fan speed. Is this right and if so, should I set it low or high?
 
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