They will work fine at lower FSB speeds along with some fine tuning on the skews and delays, just finding that right balance above 450FSB (9x450, DDR2-900 4-4-4-12 is my limit on some very good GSkill or OCZ 2x2GB kits) is hard right now but solvable with BIOS updates.
I am getting 7x550 at DDR2-1100 with 5-5-4-15 (GSkill 2x2GB 1100 kit, E8400/stock cooler) on the ASUS P5Q-E after the last BIOS update (would not post before), but tRD is so relaxed (13) for 24/7 operation that 9x427 (tRD 7) is actually faster and of course easier to do.
Most of the P45 boards have suffered from this but the suppliers are coming around now with proper 4/8GB support. I just think everyone got carried away with the single channel 600+FSB races instead of remembering what 95% of the owners will do with the boards.![]()
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