Gnalan
If this is the incorrect place to seek advice from people who may have been sent an incorrect replacement model, then I apologise. However, if this thread is permitted on this forum then I would be very happy to hear from people who have resolved such an issue and how they did it.
Looking forward to hearing from those willing to help.
When EVGA has No Stock of your 550G2 What would you like to do wait a few months or get one now of equal or better than what you have now.
I works the same way with Graphics Cards, Your GTX 550 Died and they send you a GTX 660 to replace it.
If you are unhappy with what you got then you need to contact EVGA and ask them what options you have.
Still what is the Problem with what they Gave You?
You may want to review this
http://www.evga.com/howtorma/ How to RMA.
If you have any questions about the preceding RMA terms and conditions, please contact our Customer Service by calling 888-881-EVGA (3842) option 2. Customer Service can be reached 9AM - 5:30PM Pacific M-F.
http://www.evga.com/support/warranty/power-supplies/