As is now standard across all new iMacs, the new iMac 27" features support for PCIe-based flash storage. This is a pleasant surprise compared to last year's 21.5" model, when we were left sorely disappointed by unpopulated solder pads on our low-end logic board.

According to Apple, the inclusion of PCIe flash storage allows for up to 50 percent faster speeds than the previous generation.

The Fusion Drive option combines the large storage capacity of a hard drive with the high performance of flash to deliver shorter boot times and faster access to apps and files.