What kind Ram do you have (model, speed, timings). Your Ram may simply not be capable of 1000 Mhz! 2GB modules are especially troublesome.
Northbridge voltage increases often help Ram clock faster.
You could also increase you timings (to say 6-5-5-15). But remember, memory running at 4-4-4-12 at 800 Mhz. is just as fast as memory running at 5-5-5-15 at 1066 Mhz.
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