Is A1200 power supply to weak for Viper 1240 or 1260?

[novaburst]

I'm thinking about getting a Viper 1240 or 1260 for my A1200.
My A1200 is not a tower model, it is in original case.
Is the original power supply in the A1200 strong enough to handle the Viper 1240 or 1260?

If not, is there a certain type of power supply I should upgrade too?
I would like to stay with the original case too, so hopefully if I have to upgrade, I can get a power supply that works with it.

[novaburst]

Ok, very good advice everyone, thank you!
I am also getting a scandoubler, so hearing about that, reminded me of it.
I found the Viper is offered at Softhut. Looks like I definitely need to shop around for a better power supply.  I'll see if they have one there when I order the Viper.