Some people say 1T is important, some say it doesn't matter. I'd say its not that important. If you want to squeeze the very last ms from a Super Pi run, then 1T may make a little difference but for everyday use it won't show. I like to stay 1:1 than use a divider, so I use 2T. It varys, you have to test your system to see what difference things make. Its generally a toss up between high HTT @ 1:1 and looser timings (and 2T on the A8N) or high HTT with a divider and tighter timings (and 1T).
On every test I have ever done, Bandwidth wins out over tighter timings. If you can only get a small increase in mhz with 2t(you will have to test it) then stick with 1t. If it lets you get a bigger increase in speed then it will out perform the tighter timings.
At the moment I have the CPU at 2.86Mhz (10x286) and the RAM at 239.4 (3-4-4-8 and 1T). This performs well on the benchmarks and at relatively low voltages (1.44 and 2.7). I tried changing the CPU to 2.84(11x255) with no divider to give the RAM a speed of 260MHz (3-4-4-8 and 2T) and at the same voltages the whole system became a lot less stable. How would I make this more stable? Should I increase Vcore or Vram or both?
Also, if I stuck with the stable setup and changed the timings to 3-3-3-6 and 1T, would increasing the voltages make the system more stable?
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