Quote Originally Posted by eva2000 View Post
i7 memory quality not only effects frequency head room but ability to run certain timings so you have 10x core i7 cpus where only 5 or 6 of these cpus can do DDR3-2000Mhz at CAS7.

4GB detection usually occurs when vdimm and cpu vtt (uncore) differential balance isn't correctly set to what your core i7 cpu likes.. so play with the vdimm and cpu vtt somewhat. Same improper balance between vdimm and cpu vtt can also cause everest/sandra bandwidth to report lower than it should even if full tri kit modules are detected.

These kits are validated at 1.65v vdimm and 1.6v CPU VTT (uncore) volts.

Right now I'm working backwards for my tests starting with max intel spec'd 1.35v CPU VTT and seeing how my GTs scale as i bump CPU VTT (vdimm is no longer the sole factor determining memory frequency/timing overclocks)!
so eva ure asking me to change the difference.. ok will try again..
and i get 6gb only if i run 1.5375 set... if i down it to 1.51v set thats when the 4gb issue occurs more commonly.

so i see ure point but up to what voltage should i run on the vdimm for 2000mhz CL7.