That's dumb, Turbo messes up timers at computer start. Generally you want this to be off, especially when overclocking, to make CPU frequency constant! I AM using ITSC currently - 1ms timer resolution window, exactly: 0.9973ms. You can get to round 1.000 ms by disabling synthetic timers, but it causes input lag, so I prefer not to use this option...
Anyway OC works now, thanks for answers!