What's the max gpu for an M17x r1?

[commanderf]

Recently, I got a good deal on an m17x r1.
It has a t9600, and dual 260Ms, but one of the games I'd like to play on it has Kepler cards as its minimum. 
What's the best gen of gpus I can put in this thing? From poking around here, it seems like someone's gotten dual 670MXs running on one, and the r2 seems to have a fair amount of compatibility with newer cards, but I do want to see if I can push it a bit, say with a maxwell card. 
Also, will the old SLI bridge work on newer cards?
Thermals, or heatsink compatibility aren't a concern for me either, I have a set of two MXM heatsinks from a laptop model I know can take maxwell cards I know I can modify to work with this laptop, and i figure i can get around what seems to be the dedicated fan controller chip's incompatibility with new cards thermal reporting by just setting a static curve, or making some other system that reads temps from the cards and adjusts the fans.

[ssj92]

3 hours ago, commanderf said:

Recently, I got a good deal on an m17x r1.
It has a t9600, and dual 260Ms, but one of the games I'd like to play on it has Kepler cards as its minimum. 
What's the best gen of gpus I can put in this thing? From poking around here, it seems like someone's gotten dual 670MXs running on one, and the r2 seems to have a fair amount of compatibility with newer cards, but I do want to see if I can push it a bit, say with a maxwell card. 
Also, will the old SLI bridge work on newer cards?
Thermals, or heatsink compatibility aren't a concern for me either, I have a set of two MXM heatsinks from a laptop model I know can take maxwell cards I know I can modify to work with this laptop, and i figure i can get around what seems to be the dedicated fan controller chip's incompatibility with new cards thermal reporting by just setting a static curve, or making some other system that reads temps from the cards and adjusts the fans.

I have a 880M running on my M17xR1. Single GPU. It does ocnflict with the internal hd audio, need to see if swapping the driver install order fixes white screen issue like on M17xR3. 

 

I think 780M should work & 680m without the hd audio conflict. You can reusethe heatsinks, I think the SLI cable form fermi to maxwell is the same but 260M is different