As far as we know, there are 5 different variant available on the market for the Asus Zenfone 2. The highest specification variant of the Zenfone 2 comes with 5.5 inches full HD display, 2.3Ghz Intel Atom Z3580 prcessor, 4GB RAM and 64GB ROM.
Since the Zenfone 2 has receive great response due to the high multitasking capability, Asus has rolled out a 128GB Zenfone 2 which will be available on Taiwan from 18 of June this year.
Last but not least, with the addition of larger storage size and large display variant, there is total of 7 variants of the Zenfone 2 available onto the market. Looks like Asus is doing good with its product!