There is nothing wrong with the 775 socket, but it's old. My Dell Precision 370 has a 775 socket and it runs fine, but it's not very powerful (although it was when it was new), and there is no upgrade path.
There is nothing wrong with the 775 socket, but it's old. My Dell Precision 370 has a 775 socket and it runs fine, but it's not very powerful (although it was when it was new), and there is no upgrade path.