It should not make a difference.
Ram doesn't use much power.
You said you only have a 300watt psu check the mininum requirements for your video card that could ve the issue if you dont have enough power going to it
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I dont trust those sites. I put in my next build and said i only needed 250watts but my video card needed a minimum of 450watts. And i thought you said you bought the video card seperatley
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Only way to tell would be to test it in your main pc. Never jump to conclusions because it wont work in one pc. Also youd probably be better off buying a new mobo cpu and ram all together just for the fact that the pc only uses DDR ram DDR3 would be quite a bit faster
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