As far as I know 680m is currently (sadly) the most powerful GPU for 170EM or EM series. However after some search recently I found that there maybe a chance to have 980m on-board skiping 7 and 8 series. Some Chinese clevo resellers tested EM and 980M and found surprising results. I think this may be interested for someone(including me a owner of 680m P170EM)
Here is the original link 实测è“天GTX 980M 完美兼容，è“天 EM机器_准系统å§_百度贴å§
Please note this is not fully confirmed yet!
