Quote Originally Posted by flytek
ummm...well you would if you had 2 e6600 at 6X multiplier that stopped goin faster at inecplicably low fsb on a p5b-dlx known to go much higher on the fsb.
swop one chip for the other and the fsb wall changes....and this all while hovering below 3ghz for the core....

fsb walls exist...you just have to look for them
no they dont.

the P5B deluxe has a NBCC that gets higher the lower you set the multiplier.

say you have your E6600 and are setting 6 x 500 cause you think that will work.

Multiplier divide by set multiplier = X, take X and multiply that by the FSB, then take that number and multiply that by 4 and you get the NBCC.

9/6 = 1.5 x 500 = 750 x 4 = 3000 mhz.

a 3 ghz NBCC is extremely high and in 90% of cases will not be bootable.

a CPU with a lower default multiplier has a far better chance at hitting 500 then a CPU with a high multiplier, which is why you see E6300's do it all the time, but never a E6700.

yes, the 4 meg cache will hold them back... but even a 4 meg cache CPU can hit 500 stable... so thats not the issue.
its the north bridge core clock.

a typical NBCC will not like going higher then about 2400 mhz before freaking out.

if your doing default multiplier, 2400 is enough for a 600 FSB.
but once you lower your FSB, you start to drastically decrease your CPU's ability to hit stable FSBs that are really high cause you greatly increase the NBCC faster.