It is possible ;), but...
- the RAM will operate at the speed of the slowest RAM module installed
- it's possible that the system operates unstable with different RAM modules (there's a reason RAM packages with two or four modules are sold)
- Dual-channel mode will work, but you need them to install in the correct RAM slots, otherwise it will operate in single-channel mode.
Installation for G73Jh: 4Gb modules in slots 1 and 3, 2Gb modules in slots 2 and 4
😉 Below you see, which slots has which number.
Desktop: Xigmatek Elysium | Rampage IV Extreme | i7-3960X | G.Skill 32Gb DDR3 2133Mhz|fastest Asus MarsII on the planet:cool: core 950Mhz| Kingston HyperX SSD 240Gb + 300Gb Intel 300series SSD + Velociraptor 600Gb + 3TB HDD | Enermax Maxrevo 1500W| 3xDell U2412m |
Laptop: Samsung 940X3G | i7-4500U | 8Gb RAM | 256Gb SSD | 13.3" 3200x1800 |