...with my dual 512MB sticks of 333mhz ram , which are two different brands
Are the timmings different on these two? May not be a huge factor in why you can't OC, but could be giving the system fits.
It all sounds mish-mash IMO. Asking for different brands of 333 memory to run at 400 isn't just a sane thought really. and OC'ing the memory to one level (400Mhz) then trying to go from there as if it was always at that speed (400Mhz, again) isn't a good way to look at this. Simply pushing standard 333 memory to 400 levels is a fairly hefty OC, anything above that is extreme.
Othwerwise the RAM will just be recognized as 666MHz because of the HT technology
HT has nothing to do with doubling memory speeds.
Frankenstein needs reworked if you want to OC more readily. 533 CPU (133 quad pumped) on 800 (200FSB quad pumped), 333 memory of different brands...this thing just isn't an OC monster. Getting rid of the 533 CPU to use a 2.4C (800 core) is a good move, but to get it to the 2,400Mhz it's supposed to run at will take seriously going above your 333 memory's rated speeds. SO, simply making the 2.4 a 2.4 will be an overclock in itself, and going up from there would be a verticle cliff IMO.
I'm REALLY confused on what's going on here and who we're trying to OC. Are we trying to see if your 2.4 (800Mhz core) will OC to 3.0G on the IC7!? Yes...yes it will with a lot of work and different parts.
Your brother's problem with his 3.2 is a different thread, or handled later on...So much stuff at once, but YES...3.0G is possible
on YOURS with the right memory in there. But let's work on that, then help out your bro.