If you have an original A7V (KT133 Chipset, not KT133A), the chip will
only support up to 1.4 GHz (with a 200 FSB Athlon). If you run a
faster chip, you would be limited by the FSB (which might be
overclocked a little, but not nearly to 133). If you want to use a
Barton Chip on either the A7V or A7V133, I believe it is theoretically
possible, but not at the right speed unless you had a socket adapter.
I've only seen one that works on a SocketA chip and it was reviewed
very recently on Tom's Hardware. It looks like a good way to do a
cheap upgrade (sorta like the old Overdrive, Powerleap and EverGreen
processors). It allows you to maintain the 200FSB while ratcheting up
the Multiplier to run the chip at a speed that is relatively close, if
not identical, to the intended speed. The units (with a HSF) are about
$40 and a 2500+ Barton can be found for just under $100. Not too bad.
Read about it at:
http://www6.tomshardware.com/cpu/20030703/index.html
Good Luck,
BG