Your card manual should give that.
See page 12 (page 7 index wise) of <A HREF="http://www.ati.com/support/products/pc/radeon9800/Getting_Started.pdf" target="_new">this pdf</A>.
OPTIONAL: Dont use the power connector that says FAN only (u might not have this, but dome PSUs do have)
<font color=blue>Futile is resistance,</font color=blue><font color=red> assimilate you we will.</font color=red>
<b>Hard work has a future payoff. Laziness pays off now.</b>