Lenovo latest flyer:


Y500/Y400 optional ultrabay components available according to Hikari85:
Idea Y Series Options
Y400 Removable DVD Burner DB35 RM190
Y500 Removable DVD Burner DB36 RM190
Y400 Removable HDD F450 RM450
Y500 Removable HDD F451 RM450
Y400 Removable Graphics GN35(GT650m) RM580
Y500 Removable Graphics GN36(GT650m) RM580
Y400 Removable Fan S2601 RM75
Y500 Removable Fan S2602 RM75
IdeaPad 170W AC Adapter (CE) RM229


pic & box identification for official local set Y500/Y400/Y580:
- SIRIM sticker is at the bottom of local set laptop
- Look for "MY" sign on the box, ie IDEAPADY500xxxxxxxxxxMY.
- make sure the spec same as local set listed above.
- make sure is the local set part No. stated on the box.
Y500/GT750m(59-377008), Y500/GT750m sli(59-378187), Y400/GT750m/DOS(5937-7760), Y400/GT750m/W8(59-373880)
Refer local Lenovo site for any changes:http://bit.ly/rpZTBR
- local set all come with 2 yrs international warranty

take back to the seller request a new unit

Y500 local set stocks are drying up fast. Good luck finding them Go with Y510P lah
Yes, if you could find the Y500 single GPU, you could buy the external GPU later and slot it in (need to be the exact model. SLI only work if GPU match).

Also note the you need the 170w adapter as devour sifu mentioned.
The touchpad is not "problem". it is a "fact" that user have to adapt

I think quite difficult to find non-SLI version now.
If you can wait another 2-3 weeks, then perhaps y510p would be a better choice.

Whre u found it? Link pleasee..

yes but its hard and price wise.

Chances are very slim since the Y510p SLI model will be available. 

Alternatively, u can get it from Y500/Y510p SLI users who wish to sell their swappable GT750m + 170w adapter. 

Good news and great effort. 
Wish more resellers will persuade Lenovo to bring it to us. 

Y510p feature optional swappable ultrabay gpu (GT750m) but not available, haizzz to many potential buyers. 

Between the Y510P & Y500, if both are SLI GT750M, which would you get?
Price difference seems to be RM100 only.
Lenovo Y510P 59-389550 (2xGT750) = RM3999
Lenovo Y500 59-378187 (2xGT750m) = RM3899
My concern is the cooling as the Y510p runs slightly hotter.
According to notebookcheck, both are using the same chassis so they're the same size.