Gigabyte Mobile NVIDIA driver v331.97 for Windows 8 64bit
Looks like Gigabyte are also bringing out possible 840/850/860/870 or 880M based notebooks very soon.
* nvgb.inf supports 57 models: [DEV_0DF2&SUBSYS_15261458] NVIDIA GeForce GT 435M [DEV_1198&SUBSYS_A5521458] NVIDIA GeForce GTX 880M [DEV_1199&SUBSYS_14561458] NVIDIA GeForce GTX 870M [DEV_1199&SUBSYS_17561458] NVIDIA GeForce GTX 870M [DEV_1199&SUBSYS_A5521458] NVIDIA GeForce GTX 870M [DEV_1199&SUBSYS_B5561458] NVIDIA GeForce GTX 870M [DEV_119A&SUBSYS_17561458] NVIDIA GeForce GTX 860M [DEV_119A&SUBSYS_A5521458] NVIDIA GeForce GTX 860M [DEV_119A&SUBSYS_B5561458] NVIDIA GeForce GTX 860M [DEV_1391&SUBSYS_A4561458] NVIDIA GeForce GTX 850M [DEV_1392&SUBSYS_674A1A58] NVIDIA GeForce GTX 860M [DEV_1392&SUBSYS_A4561458] NVIDIA GeForce GTX 860M [DEV_0A70&SUBSYS_11001458] NVIDIA GeForce 310M [DEV_0A71&SUBSYS_11001458] NVIDIA GeForce 305M [DEV_0DCD&SUBSYS_15251458] NVIDIA GeForce GT 555M [DEV_0DCD&SUBSYS_15321458] NVIDIA GeForce GT 555M [DEV_0DF2&SUBSYS_15251458] NVIDIA GeForce GT 435M [DEV_0DF6&SUBSYS_25251458] NVIDIA GeForce GT 550M [DEV_0DF6&SUBSYS_25321458] NVIDIA GeForce GT 550M [DEV_0FD1&SUBSYS_24421458] NVIDIA GeForce GT 650M [DEV_0FD1&SUBSYS_25421458] NVIDIA GeForce GT 650M [DEV_0FD2&SUBSYS_15421458] NVIDIA GeForce GT 640M [DEV_0FD2&SUBSYS_24421458] NVIDIA GeForce GT 640M [DEV_0FD4&SUBSYS_25421458] NVIDIA GeForce GTX 660M [DEV_0FD4&SUBSYS_67451458] NVIDIA GeForce GTX 660M [DEV_0FD4&SUBSYS_67461458] NVIDIA GeForce GTX 660M [DEV_0FDB&SUBSYS_24421458] NVIDIA GK107-ESP-A1 [DEV_0FE1&SUBSYS_24421458] NVIDIA GeForce GT 730M [DEV_0FE1&SUBSYS_A4421458] NVIDIA GeForce GT 730M [DEV_0FE3&SUBSYS_24421458] NVIDIA GeForce GT 745M [DEV_0FE3&SUBSYS_A4421458] NVIDIA GeForce GT 745M [DEV_0FE4&SUBSYS_15521458] NVIDIA GeForce GT 750M [DEV_0FE4&SUBSYS_24521458] NVIDIA GeForce GT 750M [DEV_0FE4&SUBSYS_35521458] NVIDIA GeForce GT 750M [DEV_0FE4&SUBSYS_A4521458] NVIDIA GeForce GT 750M [DEV_0FE4&SUBSYS_C5521458] NVIDIA GeForce GT 750M [DEV_1050&SUBSYS_11321458] NVIDIA GeForce GT 520M [DEV_1054&SUBSYS_11001458] NVIDIA GeForce 410M [DEV_1054&SUBSYS_11251458] NVIDIA GeForce 410M [DEV_11E0&SUBSYS_25521458] NVIDIA GeForce GTX 770M [DEV_11E0&SUBSYS_A5521458] NVIDIA GeForce GTX 770M [DEV_11E1&SUBSYS_17561458] NVIDIA GeForce GTX 765M [DEV_11E1&SUBSYS_25521458] NVIDIA GeForce GTX 765M [DEV_11E1&SUBSYS_A5521458] NVIDIA GeForce GTX 765M [DEV_11E2&SUBSYS_15521458] NVIDIA GeForce GTX 765M [DEV_11E2&SUBSYS_24521458] NVIDIA GeForce GTX 765M [DEV_11E2&SUBSYS_34561458] NVIDIA GeForce GTX 765M [DEV_11E2&SUBSYS_67481A58] NVIDIA GeForce GTX 765M [DEV_11E2&SUBSYS_A4561458] NVIDIA GeForce GTX 765M [DEV_11E2&SUBSYS_A7481A58] NVIDIA GeForce GTX 765M [DEV_11E2&SUBSYS_B5521458] NVIDIA GeForce GTX 765M [DEV_11E3&SUBSYS_34561458] NVIDIA GeForce GTX 760M [DEV_11E3&SUBSYS_A4561458] NVIDIA GeForce GTX 760M [DEV_1247&SUBSYS_15321458] NVIDIA GeForce GT 555M [DEV_1247&SUBSYS_67441458] NVIDIA GeForce GT 555M [DEV_1292&SUBSYS_35521458] NVIDIA GeForce GT 740M [DEV_1292&SUBSYS_C5521458] NVIDIA GeForce GT 740M