There is not step up for the z68 sli.
EVGa Z68SLI A5 Bios
i7-2600K @ 4500 MHz (1.3v), BLCK = 100
GSkill PC3-17000 4x2Gb @ 1867MHz, 9-10-9-30, 1.6v
2 ea EVGa GTX480HydroCopper SLI @ 752/1900
2 Dell 2407 FPW LCD 24" Widescreen
Corsair Force 3 240 GB SSD & Raid0 2 WD 250GB SATA II @ 465GB
Corsair HX1000W
Cooling: CPU: XSPC Raystorm / XSPC ResPump / 1X240 BI II RAD / 1/2 Tygon
Temps CPU: 25c Ambient / 33c @ Idle / 56c @ 100% Load [link=mailto:w/F@H]w/F@H[/link]
Cooling GPU: HydroCopper / Swiftech MPC 655 / 1X360 BI II RAD / 1/2 Tygon
Temps GPU: 25c Ambient / 44 @ Idle / 59c @ 100% Load [link=mailto:w/F@H]w/F@H[/link]