ProFire 610 Firewire Question

Currently my laptop has a firewire 4-pin insert and I'm aware the ProFire 610 will work with the 4-pin so long as I use the power supply with it, however I bought the unit used without the power supply. Now my question is I have an express card slot that isn't being used. I was wondering if I picked up an express firewire 6-pin card would that be enough to power the ProFire by itself? I'm thinking it would be fine since it would be drawing power from the laptop but I'd rather check here first being blowing the cash.

Here's the card I'm thinking about: http://microcenter.com/product/29856...ExpressCard-34

Any help would be appreciated. Thanks guys!