I have a dell Inspiron computer(was told that the pus on dells are pretty bad) that only posseses 300 watts of power. I was looking to upgrade my graphics card to play some modern games. I have an intel i-3 2130 processor 3.4 GHz. My question is whether or not I can use the 7770 with 300w. If not, what is the best graphic card I can use with 300w for gaming?