NOT the same!!!
If your mobo supports dual channel, 2x 256 will work a lot better than 1 single stick.
If it doesn't, choose 1x512,that way you have more ram slot for upgrade in the future.
If your mobo supports dual channel, 2x 256 will work a lot better than 1 single stick.
If it doesn't, choose 1x512,that way you have more ram slot for upgrade in the future.