im running a 23 inch 60hz and on full on bf4 here is my pc specs:
Black Flag PC GAMEs
NZXT Switch 810 Black Full Tower USB 3.0 Gaming Case
Antec High Current GAMER HCG-850W 80+ Modular PSU
Intel Core i7 4770K 3.5Ghz Overclocked to (8 x 4.6GHz) CPU (not clocked due to my area is very hot and lot of power dips)
Noctua NH-D14 Dual Radiator 6 Heatpipe Dual Fan CPU Cooler
MSI Gaming Z87-GD65 SATA 6Gb/s USB 3.0 Motherboard
16GB DDR3 1600Mhz High Performance Gaming RAM
2 x MSI Gaming Edition TFIV GTX 780 3GB 384bit OC Cards In SLI
Samsung 840 EVO 120GB r: 540mb/s w :440mb/s SSD
1TB WD Blue 7200RPM SATA3 6.0Gb/s 64MB Cache HDD
Integrated 8 Channel HD Audio
24x Dual Layer DVD +/- Writer
Integrated Gigabit Network LAN
.....
i went and made a user.cfg file and set a command :gametime.maxvariablefps 200
getting now between 100fps and 160fps and drivers is up to date
On heaven benchmark 4.0 got max fps of 135fps min of 27fps avg of 67fps score 1704
settings to extreme screen res to 1920X1280 1080p
it seems its bf4 that does not yet support crossfire or sli in battlelog forums nvidia replied an sain its a dice issue