ryvin :
I may pickup a spinpoint soon for a second drive. I lean towards WD because I have never had a problem with them...also 6gb/s
I did the exact same thing for the exact same reason till i saw the benchmarks for both. They dont lie and the samsung seems to be the fastest mechanical drive out there even beating some SSD's!
There will be no difference in speed at all with 3 vs 6 dimms. The reason people say 3 is better then 6 is that there is more likely to be compatibility issues with 6 dimms. 6 dims of ram may be more likely to run below rated speed or sometimes not show up.
HERE IS HOW TO CHOOSE YOUR RAM
1. get the ram compatibility chart from the mobo manufacturers website.
2. Find the ram on that chart with the lowest CAS from a good manufacturer. The mhz is not all that important as long as its 1600mhz or more but buying 2000+ is kind of a waste since cas and price is generally higher (the lower the cas number the faster)
3. look how many dims of that ram is supported (on the chart).
4. Call the mobo manufacturer and ask if they have tested the board with X# of dimms of XXXXXX ram and does it run at rated speed. The ram i got said it was supported 3 and 4 dimm configuration (i know, weird) so i called asus and said WTF is the deal with 4 dimm and were they sure it would not work in 6 dimm. They said that it should indeed work in a 6 dimm configuration but i may have to drop the timing slightly if i had to do anything at all. If i got 4 dims it would work as 1tripple channel (weird again)... Well 6 dimms works fine like they say no tweaking at all necessary. If your still worried call the ram manufacturer and ask them. The mushkin guys are great. He transferred me over to a dude using my mobo with 6 dimms of the memory i was getting so i was confident then.
5. Once you have decided on the ram shop around a lot! i got my ram for $98 per 6gb (3X 2gb) which is close to half what amazon was selling it for. Sure i had to buy it from a co i didnt know and trust but again i talked to the guy on the phone and he seemed honest and cool + they just drop shipped the stuff straight from mushkin so i had no worries and saved over $100.
In my opinion the only reason to consider ram with higher MHZ is because it gives you more flexabiltiy to overclock since the BCL it tied to the ram speed. so it becomes a balancing act between base clock, ram speed, performance, and voltage.
Another reason you may considder 3 dimms rather then 6 is because if you want more later you still got room. Computer are progressing so damn fast though i feel its pretty unlikely you will ever buy those last three sticks of ram before they become obsolete.
One last reason is that if you are buying a HUGE cooler like the NOCTURA D14 you may not be able to fit 6 sticks of your desired ram under that mammoth! This is a reason to STAY AWAY from ram with tall heat spreaders. the redline has a very low heat spreader. This does not apply when using the 212 + though because you can side the fans up higher on the cooler.
p.s. i love being a nerd!