Tom's Hardware has published many articles about memory. In some of the recent articles it was noted that those extra tall memory heatspreaders do not improve memory cooling. Optimal memory cooling is achieved without any heatspreaders. Other web sites have confirmed the findings. Consider those tall heatspreaders as an advertising gimmick. Memory modules are located next to cpu heatsinks with fans that draw cool air right over the memory modules.
In addition, when installed in the memory slot closest to a cpu, the memory modules with tall heatspreaders will interfere with tower style cpu heatsinks such as the Titan Fenrir.
enzo matrix was correct in suggesting memory modules with lower timings operating at a lower voltage.
I would consider anything over DDR1600 a waste unless you are into LN2 and 5 Ghz OC's. Yes, CAS 6 is better than CAS7, CAS 7 better than 8, etc.....whether it's worth it is up to your budget constraints.
I also agree w/ johnnylucky but with a caveat....I'd say "most" head spreader technology does nothing but make it look cool. OTOH, I have seen tests / articles on the Dominators in the past where a measurable advantage was tested and observed. Same for the Ascent cooling modules from Mushkin. Competitors faced with a choice of duplicating the performance or slapping on a look a like seem to have gone the latter route.
Some heat spreaders will cause a problem with aftermarket CPU coolers but it's specific to each particular combination of MoBo, cooler and RAM modules. The Ascent coolers have more of an issue with width rather than height as the liquid vapor chamber interface needs a circuitous route to function.
Whether it will make a difference or not is highly subject to air circulation within your case. I have one box here where I had to add one of these to make it stable at stock speeds.
Most manufacturers offer a module set w/ and w/o the coolers. In my last build, the 998691's were recommended for 12 GB setups and the 998692's (w/ Ascent Cooling) were recommended for 6 GB setups. The Coolers add up to 10% to the cost of the memory $189 vs. $204 when I bought) . As it turned out, the larger spacing of slots on the R2E I coulda fit either. I have the DDR1600's 998692's running at 10% over rated speed (1760). The 998691's just reappeared on newegg this week but have ballooned to $249.
Yup. I heard before that DDR3-2000 is a waste, now it's reinforced.
At the moment, I can't afford Dominators or Ascent Coolers (My RAM budget is >$200).
The same friend of mine suggested getting the dimensions of my HSF, then walking around "The electronics retailer that sells you fried things", measuring mobos.. I guess I'm going to do that next weekend...
I have an Antec 1200 now, so airflow won't be a problem.
Isn't it great that a $5 fan can save a $2000 build? Great stuff.
Well, (whether you got my last post or not [i posted and it didn't appear.. odd..]), I narrowed it down to these: