Major frame drop/stutter issues

certain places experiencing stuttering and huge drop in frame rate

noticed in task manager seems to be a CPU issue
i noticed multi-core rendering option cant be changed but i tried changed threw dev console but didn’t seem to help (not sure if this method actually enabled or not)

CPU 980x@4.6ghz
Video 2 480SLI
120hz monitor

Max settings
frame capped at 120 dip to low 60
without frame cap goes up to 300 fps and drops to low 60

things i tried
disabled hyper threading
set hl2.exe process priory to high
messed with CPU affinity
set pre rendered frame to 1
different video drivers
disabled SLI

nothing is working

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.