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Altered the system agent voltage with offsets between .100 and .250, no success. Won't run at 1600 or higher, even with higher latencies and voltage. http://www.crucial.com/usa/en/blt4g3d1608et3lx0#reviewDetails I'm not really certain what causes the 1333/1400 limit here. The CPU, the chipset/MB, the BIOS or a combination of them?

So it's some kind of lottery, unfortunately. I've tried with older versions of BIOS, the XMP was recognized correctly (1600), but the system wouldn't start. Strangely in the next bios versions ( those optimized for Haswell ) the ram speed limit was even lower, 1333. Now I'm forced to stick to the newest BIOS, at least it supports 1400 with 6-7 latency. Maybe some AMI BIOS editing tools would work.... But for the time being i give up. Thank you

Hello, How is it possible to run your ram @ 2133 with an Pentium G3258 on Z97 MB? Everyone on forums ( tomshardware, etc) claims that the CPU memory controller limits the speed @ 1333/1400, including some guys with Z97 systems. Even ASUS guys told me that is "impossible", so they are lying. I got a nice litte ASUS Vanguard B85 with nice Crucial tactical memory and G3258@ 4.5, it would be a shame to run the memory at only 1400. How do increase its speed? Do I need a modified BIOS? The one I got , UEFI BIOS, has lots and lots of voltage options ( and others ) for CPU, but nothing for memory multiplier or bCLK. For a few dollars more i can get some entry level Z97, but Vanguard looks too tough and polished to give up on it. Thank you Isaiah ( hornybluecow ), or anyone who helps.