Had already Kingston for my previous iMac (24er with 2x2 GB Riegel) and ran perfectly. So I bought for my 27er who has held 8 GB, again 2 8-bars. Runs like oiled again. No swapen and not tough open windows with a lot more content. In the assignment of the memory banks of the Mac but ran only after I einhielt the simple sequence 1 2 3 4. So no 1 and 3 and 2 and 4 take various instructions on the Internet the same benches for bars. So no longer started my Mac (late 2013). With the availability Bank1 and Bank 2 for the two 4-bolt and then bank 3 and 4 for the two 8-bolt it sparked immediately. Anyway, it applies here: the more the better.
