I've got a 600 (unknown actual core) running @750 w/ cache @2/5 speed.
My understanding is that with a goldfinger card you should see about 850 MHz max w/o a change in your cache speed (750's come stock w/ 2/5 set)... There is a site which offers experienced users (I say this cause one wrong move and you fry your BIOS) the ability to create a BIOS file that, when flashed to your board, will give you a BIOS locked cache speed of 1/2, 2/5, or 1/3. They're at
Http://www.insanehardware.com/scoopage/k7v/k7vcachebios.shtml that is how I flashed mine... Unfortunately w/o changing to 1/3 cache speed, via this flash or crazier yet a solder hak to your chip, the cache is too unstable to exceed the 850 w/o problems...
If you stay @ or under 850 a nice heatsink w/ dual fans AND a couple of case fans mounted directly above the CPU blowing down on it should keep you cool... While heat is a major issue in O/Cing, you might also want to make a Thermal Sensor, see
http://www.k7v.com/probe.asp on how to do this...
Good Luck...