Is it ok to use either a molex to 8 pin or...

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I'd replace the 450 Antec unit you have with something else, Antec is a good brand but the VP is their lowest model range, more for basic systems not those with gaming video cards, or power hungry FX 8xxxx CPUs. Especially since you are 50 watts under the recommended for the video card. While that number is always higher than what you really need, you don't want to run under that on a low quality PSU.

This is a good unit and not too pricey http://www.newegg.com/Product/Product.aspx?Item=N82E16817151094




I'd replace the 450 Antec unit you have with something else, Antec is a good brand but the VP is their lowest model range, more for basic systems not those with gaming video cards, or power hungry FX 8xxxx CPUs. Especially since you are 50 watts under the recommended for the video card. While that number is always higher than what you really need, you don't want to run under that on a low quality PSU.

This is a good unit and not too pricey http://www.newegg.com/Product/Product.aspx?Item=N82E16817151094




 
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