2GB sticks? The number you posted previously, H5PS1G83EFR, references 1GB sticks, in a configuration of 8x128MB chips, based on the manual from the Hynix website.
I'm assuming you don't get a SPD table from CPU-Z with these sticks?
You can try loose timings and higher volts, maybe they'll get you to 1000MHz, won't know 'til you try.