If you're planning to buy top end water cooling to push your system to the limit, won't you start with the best equipment you can buy without invalidating warranties and buying extra cooling?
$300 of top of the range water cooling?
A $800 processor?!
$400 x 2 graphics cards?
Who has these high end components lying around (well, apart from reviewers?)! If you're reading this site, you're you won't need convincing and you're gonna know you're gonna be overclocking these if you can afford them, because you're a crazy overclocker! And you're gonna have some kind of 8800 too!
And yeah, calling an article extreme, having a nitrogen cannister on the front page, and then using water cooling is a little duplicitious!
This has convinced me not to extreme overclock, since just buying a better graphics card and lower specced processor would have given me ten extra frames on Oblivion without all the fandangoing with tubes.
I'm pretty sure that 4300 owners are matching 6800 extreme speeds on stock cooling, and beating 3Ghz with a top end air cooler! Water cooling 3.5? And for a processor a seventh of the price! And it'll still comfortably run games for, um, at least the next year. Maybe.
And of course, I don't have these things "lying around" and Danger Den don't send me high end water cooling bits for free!
What kind of budget would this project have? $1500+? Heck, $700 would have got you a better card and better results!
PS. It's unfortunate that Doom3 isn't on the interactive charts any more (maybe Hard Truck Apocalypse and Titan Quest can go, as Oblivion, Half Life 2 and Prey surely between them test all you need to for benchmarks?) since Doom3 keeps popping up in articles about overclocking and benchmarking (like this one!) For the next bunch maybe they can change Ride of Legends (whose still playing this? There's almost no fan web covererage of this game, not last time I looked) to Supreme Commander, 'cos that's gonna be the next big RTS benchmark and the next big upgrade question mark since Oblivion for a lot of people.
But don't let what I wrote put anyone off, 'cos THG is still a great site!