P4 805 overclocking with DDR

Would it be possible and practical to overclock the P4 805 to 4 Ghz on a motherboard with DDR rather than DDR2 and AGP.

My Pc spec is currently
Athlon Xp 2600+
2 x 512 Mb DDR 3200
1 x 250 Gb WD SATA and 1 x 250 250Gb maxtor IDE
X800xt agp

I'm skint ATM but i think my processor is getting a bit long in the tooth. I was looking at prices in the UK and i can pick up a motherboard and processor for about 130 quid and maybe a nautillus 500 for another 100 and if it is practical overclock the hell out of it.

The question is with the memory running asynchronously on a lower divider will it boot and will it have big enough performance increase to make it worth while upgrading.

Just forget it, the P5P800 SE does'nt have good enough power regulation to properly feed a 4GHz 805D, that thing is too much of a hog, it will cause the voltage to fluctuate a lot no matter how you cool those flimsy VRMs. You'll need a high end motherboard with some solid 8 phase VRMs in order to get that high.

On top of that, this Corsair watercooling kit is barely better than high-end air cooling (they should have sticked to memory), you'll need something better like a DIY loop with a powerfull pump, a car heatercore and an high-end waterblock for 1/2" hoses.

Don't overlook the fact that unless you're going for short benchmark runs, reliability under load will be a big issue if you intend to run that thing for hours on end.

I would be surprised if you manage to break 3.4GHz stable under a sustained 100% load.

You also need to keep in mind that even though many hardware sites have articles about 805D overclocking, none of them (AFAIK) performed any kind of stress testing, sure, benchmark results are interesting but a 4GHz 805D is absolutely useless if it crash and burn after 30 minutes worth of dual Prime95.

BTW, countless threads have been posted about this very topic, use the Search Button.