Can DDR3 2133 1.6v @ 11 CAS run at 1.5v 1600 @ 7 or 8 CAS? I jumped the gun ordering the latter with a 2700K @ Z68 motherboard. After reading a post I found that my 2700K will only support 1.5v, 1.6/1.65 with stability issues. So I'm hoping to run the 2133 @ 1600 with lower volts and timings, but not sure if it's possible.
Look at the 'SPD' tab of CPU-z of the kit and you'll know what has been proven to work. Kits like F3-17000CL11D-8GBXL (1.5v-1.6v) yep but other kits??!! If there's a JEDEC ~800MHz @ 1.50v then yes, but if the voltage says 1.60v then no.
My experience with most G.SKILL's, if that's what this is, is that most DDR3-2133 kits have a ~800MHz @ 1.50v JEDEC option. However, often many have a 'crappy' DDR3-1600 options with CAS very high (slow) CAS Timings. In any case always run Memtest at minimum 4-passes or more -- more if not running per Rated.
Wow, never knew how to read the 'SPD' tab on CPU-Z! Thanks! Also, on my 775 mobo atm, my memory is 2.1v 1066. BUT I see JEDEC #1 266 Mhz with 1.80v, JEDEC #2 400Mhz 1.80v and EPP#1 533 2.1v. What is EPP? and will I possibly see this with the DDR3 kit?
EPP (Enhanced Performance Profiles) is the precursor to XMP (Extreme Memory Profile) they're encoded speeds with the RAM set -- little different than JEDEC (f/k/a Joint Electron Devices Engineering Council).