360freak

I know it's a no-no, but here's my situation.
Very shortly after buying this: http://www.newegg.com/Product/Produc...82E16820231122

...I see this: http://www.newegg.com/Product/Produc...82E16820231145

Both 44.99. So I have 4 gigs of that 800, and I want another set of 4 gigs. Will it be ok under those circumstances (same brand, same size, different clocks) to mix the two? I regret so much buying that first set. I could have a straight 8 gigs of 1000 mhz for the same price of a straight 8 gigs of the 800 mhz!