Go with the DDR2 800. It will give you more overclocking headroom, and the extra MHz will more than offset the timings difference. As an inconsequential bonus, you will probably be able to run the RAM at DDR2 667 with the 4-4-4-12 timings.
Go with the DDR2 800. It will give you more overclocking headroom, and the extra MHz will more than offset the timings difference. As an inconsequential bonus, you will probably be able to run the RAM at DDR2 667 with the 4-4-4-12 timings.