My 2x1gb ddr800 HZ sticks do not like 1:1 ratio - they are fine on 4:5 at ddr1000+, 4-4-4-8, but with 1:1 they don't like to go much over spec. this is on a DS3 rev 3.3, my old GBNQs were fine 1:1 at 1000+ as are 2x512mb ddr667 Ballistix (D9GMH). Kind of a bummer.