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I'm currently running the Samsung (wonder ram) @ 1600 7-8-8-20-28 1T 1.5v. About to finish 10pass Extreme in IBT. Was running 7-8-8-22-30 1T 1.45v just fine.

How much lower can/should tRAS / tRC go?

Also I read on the net that a general rule of thumb for timings is:
CL + tRCD + tRP = tRAS
tRP + tRAS = tRC

With others running lower tRAS / tRC this seems to make the formula a bit inaccurate. So whats the truth?