It's not here yet, only the Y400/GT750

A lot of shops didn't have stock today for Y400/GT750M when i buy.

Most of them replied me with "Y400/GT750M shipment will come with new Y500/GT750M, mid may or early june" but i dont know how reliable is that. 

i tried to install intel vga and iffs driver (from cd driver and downloaded from lenovo website ), but i can't,since "'this computer not meet minimum requirement
to install this software". Does anyone know why,and what should i do to overcome this issue ? Plz help me out

is there any way to enable Intel HD Graphic 4000 in my Y400?
coz i will not use SLI on Y400 (don't have money to buy UltraBay GT750M if available) 

void warranty? 

Basically the whole point of getting a Lenovo Y500/400 is because you want a gaming monster but you have a tight budget, so things like disabled Nvidia Optimus, heating problems, touchpad faultiness is expected, if you want to get a proper gaming laptop, your budget must be at least RM6000, you guys better look elsewhere rather than the Y series of Lenovo.  Just sharing my thoughts.