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Graphics card power connector

They will be ok to use, they get supplied with cards for instances where PSU's are being used without sufficient connectors.
 
I have now fitted the graphics card and the power adapter.

Should I have both white connecters connected to the power supply?

At the moment I only have one connected and the card is is installed and working ok nut I am worried I should be using both.
 
Using both just means you can deliver more current (and so the wires don't melt). As the GTS 450 is a relatively low-power card with a maximum power usage of 105W - it shouldn't need much more than the 75W delivered by the PCIE slot most of the time.
 
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