A few days ago I spotted an awesome RAM deal on HotUKDeals, Amazon UK were selling 16GB of Corsair Vengeance low profile (2 x 8GB) DDR3 1866 Mhz for only £83.57 inc VAT + delivery. My order was placed at the right time so it seems, as according to Amazon price checker camelcamelcamel £83.57 is the lowest price recorded.
I already had a set of this RAM lying around, so ordered two more kits for a total of 48GB (6 x 8GB modules). 24GB is the official maximum supported RAM for the X58 chipset, but after reading online about some success stories with 48GB I thought it was worth a shot. Popped the modules in my Gigabyte GA-X58A-UD3R Rev 2.0 and can confirm it runs as sweet as a nut. OS X Yosemite recognises the full 48GB and all 6 modules correctly, with no issues reported so far.
A nice quick win, a rarity so it seams for Hackintosh builds 😛