The best replacement for 667 is 800 ram.

The best alternatives to 667 are rated as following:
★★★★★  800 ram
★★★★  533
★★★★  ddr2 800
★★★  800
★★★  800 ddr2
★★  800mhz
★★  800 memory
★★  671
★  ddr 800
★  ddr2 533
★  675
★  onkyo 608
  1067
  2gb 800
  ddr2 1066
  533 ddr2
  800 mhz
  800 mhz ddr2
  ddr 400

Your alternative for 667 is not listed? Suggest!
Speaking about 667, one probably shouldn't forget about ddr2 533.

Other search terms related to 667 and their ratings are:
★★★★★ ddr2 533
★★★★ 533
★★ ddr2 800
You have in mind a companion for 667 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of 667 in all years. Click on graph for more.
667
800 ram
533