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The brand ain't that important. OWC, Crucial, OCZ, Kingston, G-skill, Mushkin, Samsung etc.... Are all good brands.
 
It's far far more important to buy from a retailer/site that will replace if it doesn't work. I would much rather buy from someone I trust such as OWC or Crucial or others and know that if there is a problem they will replace the ram. Ram can be touchy.
 
I'd look on newegg.com and see what the best deal is. Brand doesn't seem to matter a ton. I got crucial when I upgraded because I heard good things about it, and it was a good price.
 
Some ram is causing problems...

There are a number of review posts at Newegg about ram not working in the Mini or some books.

Anyone have info on which ram will work for sure and which ram does not?
 
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