Canon A540 - what speed for SD card ?

I'm getting a new 6MP Canon PowerShot A540 today.

I have a PQI Hi-Speed 60 2GB SD flash memory card.

QUESTION: Is this 60X (9 MB/Sec) 2GB card fast enough for this camera?

I am assuming that the camera will store the image in internal memory first,
then copy it over to the SD card. I am assuming that the time to "copy" is
the speed problem. The speed of the SD card should not influence the speed
of
the CCD, etc.

QUESTION: If I am only taking still shots about every 5 minutes, does
the faster SD cards buy me ANYTHING? I can see where video & rapid
fire shots would be a problem. But stills every 5 minutes?

I can't find any data from Canon on the required speed of the SD card
for the A540.

THANKS,
Gene