Summary: I ordered these in order to double my RAM and speed up the computer startup. Unfortunately that didn't happen---everything seems to be about the same as always. Was it worth it to upgrade? Not as of now.
Summary: Built a new computer. Had a ddr2 machine with 8 gigs. The new rig is way faster with only 4 gigs of this ram. Already bought a second one and it's in the mail. If you're building or upgrading on a budget, this is your ram.