XPS 9100 deSktop Ram Upgrade

Hi Everyone,

I've been having a hard time finding the info I need so here goes nothing:

I have this older dell computer with mobo 05DN3X .  XPS 9100 built for me around Sept 2010.

What ram can I use that WILL work with this system?  In another forum, someone recommended ripjaws: http://www.newegg.com/Product/Product.aspx?Item=N82E16820231356&cm_re=rip_jaws-_-20-231-356-_-Produc...

Or 24gbs: http://www.newegg.com/Product/Product.aspx?Item=N82E16820231359

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