I want to upgarde RAM form 1gb to 2gb. I have 2x512 blocks and wanted to fit another 2x512mb blocks. The problem is it is showing as PC2-4300 (266mhz) Spektek & I cannot find anything to match. Is this becuase I was supplied with very poor & cheap memory? I am quite disappointed as I spent a lot of cash on a fairly high-spec machine. I cannot even buy the same memory from the pc supplier. All advise very welcome.