I consider myself quite good at overclocking memory, but some you all are just supremely talented and knowledgeable! I try to pick up as much as possible from posts here, to improve my own skill set, but sometimes I am just in awe!
Thanks, Reefa_Madness; you and coolhandluke are seriously invaluable members of the forum, and we're all lucky to have you!
Going on what I know, the CFR PBC seem to have quite a bit of headroom while sticking around 1.65-1.675v, and then they get another big jump in speed from increasing the volts into the ~1.700-1.725v area. They also can run some of the tightest timings (at high speed) of the currently available high-performance IC's, with CAS9 possible beyond 1250Mhz, although tRCD is always relatively loose due to, for whatever reason, requiring a +2 latency increase over CAS, while tRP requires CAS + 1. tRAS seems to be almost irrelevant to anything except stability, and even then it has only seemed to help me if the settings were borderline, not when they were just "impossible". The command rate seems to be half CPU/half IC, but I lucked out with a strong IMC on my 3930K, and apparently some strong IC's as I have yet to find a "wall" for running 1T/1N, as you can see in some of the screens I posted earlier (which were very "quick and dirty" overclocks; no fine-tuning, no 2ndary/tertiary timing adjustments; no voltages dropped despite having room with the CPU @ 1.425v for 5.14Ghz, VCCSA/VTT1 at no more than 1.175v, vDIMM at no more than 1.66-1.665v). This in and of itself is impressive, to me, as many/most people seem to have difficult running even 1866-2133 4x4GB @ CR 1T on SNB-E, and it's very much hit-or-miss with Ivy Bridge (for example, my 3770K can run up to 2550 +/- 50 with 1T CR, but with 2T it will do up to 2880 +/- 60; yet with 2x4GB, it will hit the frequency wall before showing any signs of a problem running 1T, and that frequency wall is right around 1530Mhz at least with Trident X 2800 2x4GB).
I also have a fairly flexible BCLK with my chip, considering I'm "just" water cooling, although I am slowly turning an old fridge's guts into a single-stage, with the system having no issues running between 95.8 to 105.9 BCLK with a 100Mhz strap; I can widen the allowable frequency but it scales almost directly with cold (ducting the AC to only blow through my rads, and then into the case to prevent condensation, I can get temps to as low as 18-21C under 100% load for the CPU; it'll go much lower but at that point I don't think the potential for problems is worth the risk, and would rather just wait until I have a real phase change built). This translates into a wider range at Strap 125, giving me essentially 116.1-132.6. I have not even attempted to boot 166 strap, but maybe I should... I don't know that it would be of any benefit, though?
Anyway, I'm working on figuring out a DIY way to increase airflow across my VRM's and also DIMM's, as watercooled I have little direct airflow in that area. I have the backside MB VRM's cooled with an industrial 120V AC fan and some pure copper BGA RAMsinks, and I had ordered a MIPS RIVE Ni/BLK Motherboard full-coverage block set but it never came, and now that MIPS is gone, I've tried searching everywhere but can't find another place to buy one
I know that DDR3 doesn't put out hardly ANY heat, but I just feel more comfortable having a small bit of airflow directly across the DIMM's; even if it doesn't get me a single MHz better OC, at least I'll feel more "at ease"
I'm going to hopefully do some more RAM OC'ing tonight, and I'll post back results. I'd love to have some of you pro's go over my "game tapes", so to speak