I'm still on the lookout for a 128 GB configuration of RAM for the new Mac Pro but no luck so far. The only RAM I've seen that looks close are these: http://www.pc-wholesale.com/46w0761.html http://h30094.www3.hp.com/product.aspx?sku=10724005&mfg_part=708643-S21 I've talked to both companies, and I also talked to a Senior Engineer at Apple, but nobody will say whether these (or any other config) will work in the new Mac Pro. If I'm going to order 4 sticks of 32 GB of RAM, I would love someone to either (1) verify that they have tested it in the new Mac Pro and it works, or (2) to allow me to return the RAM without a restock fee. I've checked all of the usual places on the web for buying RAM, e.g., Crucial, NewEgg, OWC/Macsales, Ramjet, etc. I've also looked directly at many manufacturers' webpages. If anyone out there can provide some advice, I am willing to listen. I think I might have to just wait a couple more months until the RAM at this spec goes into higher levels of production and gets tested on the new Mac Pro. There is one place that looks very promising: http://macramdirect.com/macpro.html and they have a 128 GB configuration listed for the late 2013 Mac Pro, but they said that they are still testing it extensively, and it will be ready, perhaps, in March 2014. Any other suggestions? Thank you. P.S. Everyone asks why so much RAM. I'm a scientist who does a lot of symbolic computing, and I can utilize this much RAM in a single-threaded computation that does not distribute well over a cluster of nodes.