Stuck in the 939 era...need C2D info

I am going to be selling my rig here soon (check sig), not that I am unhappy with it, but have more of the 6 month itch going on (despite some of my hardware being dated, it's still kicking out almost 9k in 3dmark06, and other games run steady at very playable speeds, even at 1920x1080, and options cranked in most games)...anyways. I just need some basic information, as I am out of the loop on current intel hardware, and from what I have been reading, I need to take a long hard look at all of my options.

My questions are basic:

On an Allendale 4xxx series CPU, the FSB is listed as 800MHz
On Conroe chips, 6xxx series CPUs, the FSB is lised as 1066
IIRC, QX series chips are FSB 1333, correct? (or correct me, if I am wrong)

If any of the above is incorrect, please correct me. I need to know what the matched RAM speeds (spec speed, not for OC...that I can figure out) for each chip type. When I last goofed with intel (read - they dropped the ball, and AMD ran with it), the chips were running basically a 4x multiplier on the rated matched RAM speed, ie:

533FSB Xeons were using PC2100=133MHz x 4 quad pumped bus
800MHz P4's were running PC3200=200MHz x quad pumped bus

Is this still the case? What RAM do I use, and for what chips, that's what I need to know. Thanks, in advance...man I feel so dumb with the new stuff, all my machines are S939 (5 of them). Moving to DDR2...very slowly.

RAM speed is FSB x 2 on all of them. 6xxx series for example 266 FSB x 2 = DDR 533. 533 x 2 = 1066

heh, so the pc2-5400 (667, or 675...can't recall) is about 1 step over spec for stock, then? heh...nice. good thing he didn't ask me for the info, but i was curious. so by the fsb x2 logic, allendale chips (800fsb) require ddr2-400, but the lowest spec is actually ddr2-533, right? So the chart goes like this then?:

800MHz FSB chips --> PC-4200 or DDR2-533 (which is technically overkill...or OC RAM, since stock is 400 of 533MHz rated speed)

1066MHz FSB chips --> PC2-4200 or DDR2-533 (to run completely stock)

1333MHz FSB chips --> PC2-5300 or DDR2-667 (to run completely stock)

Is that all correct? If I am reading that all correctly, there are no Intel chips that run at FSB 1350 (DDR2-675 or PC2-5400), FSB 1600 (DDR2-800 or PC2-6400), etc? so anything above DDR2-667 is overclocking area, period, correct?

I love catching up, and feeling dumb for being behind.

the QX6700 is still on the 1066fsb
Otherwise yes you are correct on the speeds and ratings etc.