Re: Is my Ram worth an upgrade????
You said CPUID is showing 665.2MHz. The 1333 in DDR3-1333 is the amount of MT/s or mega-transfers per second. Since it is double data rate, there are two transfers per clock cycle.
Therefore DDR3-1600 would have a memory clock of 800MHz and DDR3-1866 would operate at 933MHz.
When you consider that the integrated memory controller in the i7 operates at 1600MT/s, going with DDR3-1866 would be a waste since you wouldn't be able to overclock the laptop.
The difference between DDR3-1333 and DDR3-1600 is negligible. I say stick with what you have.
FX-8350 @ 4.7 cooled by H80, 32GB Mushkin Enhanced Blackline 2133, Asus Sabertooth 990FX, 2x Radeon HD 7850 2GB in X-fire, 500GB Samsung 850 Evo, 4TB Seagate, 3TB WD Black, 2x 1TB WD RED in RAID 0