Three RAM options: Choose between 4GB, 8GB and 16GB. 12-months warranty included! Upgrade: Get an Apple keyboard and a mouse. Apple iMac: Get a 21.5" Apple iMac with Microsoft Office included. Pre-installed with Mac OS x 10.6.8. Three HDD options: Choice of 500GB, 1TB or 2TB. Compatible with: Mac OS High Sierra operating system (released in 2017). | 21.5" Apple iMac with Microsoft Office - 4GB | Wowcher