Take a picture of the inside of your case please and stating how many fans you have too.
I will help you with that as I have the same card, before you take it apart and redo the thermal paste which I'm sure it will not need doing.
I know Spikey sold you the card and he originally purchased it from Voltage too. But Spikey RMA-ed the original card and you have the RMA card now. So I know the history behind the 2 cards

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Also what OS are you on and have you made sure you don't have a bitcoin miner virus on your system or any other type of virus that uses the GPU ?
Check the idle use and temps and make sure not to run anything like browsers that can use the GPU acceleration and give strange readings.
The card will not turn on fans unless the card temp hits 60C+ that is normal, also make sure you didn't click the switch on the card from Normal to LN2 OC, top of the card little dip switch.
Do that above and shout again mate and I will help you sort it.
ALSO if you have flashed any VBIOS on the card remove it and stick the stock one back on and remove any overclocking utility that starts up with the system. Also have you been overclocking it ? And what Volts did you push threw it and what speeds were you getting ? I ask this because some people load up a VBIOS that can damage their card if they don't know how to overclock correctly with a fully unlocked VBIOS. Are you seeing any strange artifacting and driver resets when using it ?