im not entirely sure, it may just be that its isn't stable at 1t, so its reverting to default.
ive never actually attempted to clock at 1t before, so im not entirely sure what happens when it fails. but if you havn't loosened any other timings, i wouldn't expect it to work. so i assume it is just falling back to 2t.
i enjoy overclocking and benchmarking more than actually gaming these days. a little sad, but it keeps me off the streets
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IMO, ram isn't really worth the effort. i tightened the timings on mine and left it. no need to do any more. im still always playing about with my CPU and GPU trying to get more out of them. just the other day i managed to get my CPU up to 3.6ghz unlocked. thinkingg i was stuck at 3.4, i just cranked up the voltage more than usual and it worked. not exactly safe, but hey.
and yesterday i got to 1000mhz on my 5870 core.
i dont mean to ramble though, my point is, if you don't really know alot about it, there are other ways to get more performance from your system that are far less complicated.