I actually would reccomend a different type of ram if you're an extreme overclocker. The manufacturer for this ram is Centon Electronics, which most people have never heard of but they have the best enthusiast ram ever. Sadly they only come in 512mb stick flavours, but the preformance you get out of them is very worth it. This ram runs better on the DFI Lanparty enthusiast boards, because it needs quite a bit of voltage, it is set to 3.25 volts on default, but if your board goes upto 3.5 or 4 volts for memory, then this ram is for you. I have a few friends who run this ram at ddr540 with 2-2-2-0 timings on his dfi board. Here's the link to the ram.
Hiah!
If your board doesn't have that high a voltage avaliable then they have some ram chips that run at a lower voltage, for only a minimal reduction in overclockability, but it'll still run at over ddr500 with 2-2-2-5 timings, better than any other ram out there. I'd suggest getting two packs of this (4*512) and seeing what this is really worth. Here's the link to the lower voltage ram.
Hiah!
They also have another kind of uber ram out there which is called their super screened ram, which runs at pc4400 at 3-3-3-8 timings, and can be overcocked even more. They run at the lower volatage as well but they're only really good if you've got your cpu overclocked to the extreme, like with a fsb of 275 or more, but if for some reason, you have that, then this may just be for you. It has been known to go upto and over ddr-600 speeds with the 3-3-3-8 timings, and the bandwidth coming from this stuff is incredible.
Linky!!!
Of course if you're not a huge overclocker overclocker, and just want fast ram, there's a really good deal on OCZ Platinum right now on newegg. 150 for 2 gigs of their primo shtuff, running at ddr-500. Good stuff, and sexy looking too. It overclocks quite well too, but not as good as the Centon stuff.
Linky!!!