I've just bought myself the Sapphire HD Radeon 7770 for my i7 HP Pavillion P7-1058uk. I bought a new 500w power supply for it because the new card needed 450w and my pc only supplies 300w out of the box. I've looked everywhere online but hardly anyone seems to have the same PC as me and i cant even find it being sold anymore even though it's only just over a year and a half old, so i kind of just had to guess when buying a new power supply. Its an ATRIX ATX or something.
Just want to check if both are compatible for my PC. Not so much on whether it would work with what i've got, because the size of the tower is my main concern, and then there's getting into my computer's BIOS to stop the integrated Intel graphics.
You can now use two hd 7770 with that PSU. A lot of people have been successful in running a HD 7770 on a 350watts PSU, some even on a 300watts, but like you said it is always better to have more wattage.
One other thing, i can't seem to find the graphics card in the BIOS so i can disable it. However, i can find it in device manager and uninstall it.
This is how my computer gets to BIOS (I think)
ESC key > Computer Setup (F command, can't remember what one) then from there it's menus selected using arrow keys. Not even sure if that's the right menu but there is no option for hardware devices. Just information about the PC and a few security menus.