Well, what I mean about the DICE is that SB doesn't really scale better with cold. The cold kind of helps keeps chips alive and withstand the heat a little better, but it's more of a chip thing than anything else. It's a matter of how lucky you are and how well your chip clocks. My 2500k is a 5.2-5.3ghz chip. Others have chips that can do 5.5-5.6ghz on air. It all comes down the chip, almost nothing else. I've ran other 2500k with phase and it really didn't help any. It's always been a chip thing, but before you could get some crazy clocks out of almost any chip just by adding cold, with SB it's not really like that. I can't make my chip cold, pump 1.65v and all of a sudden it can do 5.5ghz. It's not good for more than 5.25ghz or so.
Now the ram thing. Most ram nowadays uses Powerchip (PSC) IC's. Even some of the high dollar ram uses thes PSC ic's. They might be clocked at like 2200 9-11-9 or something. But then a $50 1600 7-8-7 kit can use the same ic's and run the same speeds. Some of the more expensive kits might be slightly better binned, but most do the same. There were some $150 ripjaw-x kits that used BBSE ic's and they clocked slightly better.
For benching I just put a fan over them to make sure they stay cool. If I had a ram pot i'd give that a shot, but they work ok with only the fan and cheapo heatsink thye got on them. PSC don't really scale any better once you are getting close to 1.8v.