I'm not sure what power connection the 9700 will need exactly, but you should easily be able to buy an extension or splitter cable for your power supply to hook up to the card. There's no need to sacrifice an existing connection because of a new peripheral.
My only real concern based on what you've asked is the size and quality of your power supply. If you're at your limit of connectors then you might want to look critically at whether you'll have enough juice to run a stable upgraded system.
Here's an excerpt from ATI's website:
<font color=blue>Radeon 9700 PRO requires connection to your PC's internal power supply for operation. A 300 watt power supply or greater is recommended to ensure normal system operation where a number of other internal devices are installed. </font color=blue>
So, inline with what Wingding said, if you're reduced to unplugging your floppy drive to power up your R9700P, maybe it's time to upgrade your PSU.
<font color=red>If you feel like going to work today, just lie down and it'll go away.</font color=red>
dude, think about it. Where does the power to your floppy drive come from...I think you'll figure out the answer. Yes, you are SUPPOSED to use that kind of connector. If you have only one, get a spliter. If you have any free large connectors, get an adapter instead.
<font color=blue>You're posting in a forum with class. It may be third class, but it's still class!</font color=blue>