You cannot upgrade or change the RAM in a rMBP.
But why how that is not possible?
So even if i find to buy the ram or ssd i cant replace by myself?
So even if i find to buy the ram or ssd i cant replace by myself?
Every MacBook Pro with Retina display comes with 8GB of 1600MHz memory. Please note that the memory is built into the computer, so if you think you may need more memory in the future, it is important to upgrade at the time of purchase.
Well lets wait for other 3rd party ssd makers and and for price drop
If upgradability is a concern, your only choice is the classic 13-inch. While the Retina's SSD can technically be upgraded, it's not cost effective to do so, at least when compared to the plethora of 2.5-inch SSD options that you can use on the classic. For the Retina, you can either buy a 2nd-hand original equipment Apple SSD from the likes of eBay or buy the OWC Aura Pro. The 480 GB Aura is US$580.