As per the title, I had older 1333 Mhz DDR3 memory laying about and i didnt want to buy the new 1600 memory, so i installed the old one and fired up the macbook and voila !!! she works
To be specific i installed Corsair 2 x 4GB DDR3 - 1333 Mhz memory 
I also installed a DVD to HDD adapter instead of the DVD burner so i can confirm that those models from ebay will happily still fit in the new macbook too
I also installed a DVD to HDD adapter instead of the DVD burner so i can confirm that those models from ebay will happily still fit in the new macbook too