sorry that was mistake of me...i have a thermaltake 420W i think its called thermaltake rs 420 or smthing like that i dont rly know
Hi - You have more than enough watts, the 6670 doesn't draw much power. On the TR2 PSU's some are ok and others are not.
If you have the funds you might want to upgrade the PSU anyway.
Brands to consider - Seasonic, Corsair, Antec, XFX. There are other good brands, but you will be able to find a nice unit
from this list. There are some nice deals being offered. Anything in the 500w(you are ok with 400w) range
will allow you to upgrade the GPU down the line.