As is ilh, I am overclocking mildly, and also have low temps.
ilh has a 3200+ with a default clock speed of 2,000 MHz, which is 200 BUS x 10x Multiplier.
His RAM overclocks very well.
I have a 3500+ with a default clock speed of 2,200 MHz, which is 200 BUS x 11x Multiplier.
My RAM does NOT overclock as well, my machine runs fine at 220 BUS x 11x Multiplier, should be 2200, but actually runs at 2240.
My idle temps are between 29C and 33C idle, and the highest temp I have hit is 48C.
If you are interested in overclocking, you will need a good board, Abit, Asus, DFI, or MSI, you will need fast RAM, or RAM that is known to overclock well, work out the likely fastest BUS your RAM will operate at and Multiply it by 9x for the 3000+, 10x for the 3200+, or 11x for the 3500+.
If you do NOT change the voltages any of the above CPU's will be the same temperatures at the same overall clock speeds, remember overclocking does not miraculously make the CPU hotter only the clock speed and voltage increases do.
If you just cant be bothered, or think that the higher cost of faster RAM is not worth it, just buy a faster CPU, (beyond the 3500+ they use a different core, and are hotter).
PS: I have only NOT overclocked 1 system, and that was because the boards (2 of them) were crap, and were totally flaky. My best overclock was on the legendary Abit BP6, 2 x Celerons (with cache) 400MHz @ 600MHz, thats 50%.
First of all 220x11 is 2420. You will only need good ram, if you plan to overclock 1:1, just use memory dividers. For example with a divider of 0.8 (166) you could run your 3200+ 250x10 = 2500mhz and your ram would still be running at ddr400 and not ddr500.
I have Crucial Ballistix memory, but fast RAM is really not necessary for CPU overclocking, it justs gives you an extra performance with lower timings and increased bandwith.
I always refer people to this
article. Zebo runs his amd64 @ 2610 in it and uses wide variaty of RAMs from really old ddr266 to the fast samsung TCCDs at DDR590...
Doom3 1024x768 in FPS
PC2300 - 3-3-3 1T- 77.8
PC3000 - 3-3-3 1T- 80.3
PC3000 - 2-2-2 1T- 81.4
PC4700 - 3-4-3 1T- 82.3
PC3800 - 2.5-2-2-1T - 82.4
No signifigant difference above PC3000
Now that makes you think if it's really worth spending the extra money on ram. It's not.
There are only couple of reasons to buy 3500+ over 3000+ or 3200+.
1) Extreme overclocking. You need the 11x multiplier to run winbond UTT or BH5 memory at 250x11 1:1 @ 2-2-2-5. (not really possible on a silent air cooling).
2) You don't overclock at all and want the fastest winchester core.
Overclocking and silence can be done, but you just have to balance between them, you can't have both extremes. Cpu temp is hardly the nr1 reason why people in this forum underclock. It's the power usage of the CPU, with higher overclocks your CPU will use more power wich will heat up your PSU and ramp up your PSUs fan speed, this is even more true with cheap PSUs with moderate efficiency. You can't avoid this even if you have water cooled CPU.
So in order to have a silent, but powerful computer you need a good high efficiency PSU (seasonic comes to mind), good mobo (DFI, MSI), good cpu cooler and good airflow in the case to keep everything as cool as possible.
If you still don't own a amd64 Venice cores are coming out soon, they should have a bit higher temps (2-3c) then winchester, but they should be better overclockers then wichester. They will also feature a better memory controller and support for SSE3.