Dedicated Server Question

[Stu]

Hi,

I'm currently on a shared Server which is a Dual PIII, 40gig disk and 200gig B/W
I have the chance to get a Dedicated Single PIII, 40gig disk, 200gig B/W

I'm looking at putting just two vB sites on this Single PIII (both vB's are currently on same shared)

my question is if I go with the single would I notice a decrease or increase in speed? taking into account that I've no idea who else or how many others are on the shared Dual PIII

but there will be just the two sites on this Single.

Also are any of you on a Single PIII Dedicated? if so what's the performance like for your vB site?

Thanks