I found a 4Gb 2400Mhz for $27. Would it make a difference if I buy two 4Gb sticks instead of one 8Gb stick. Two 4Gb stick would cost me $54 and one 8Gb stick would cost me around $70. Is there a difference besides the price. The 4Gb stick is Patriot Signature. The 4Gb sticks are not a kit. I am going to buy them separately. Thanks!