Running with Ai Clock Twister Stronger is difficult to have it stable at high FSB a lot of memory and fast CPU's. You should have better bandwidth with Ai Clock Twister Stronger if you can run it stable like that.
I don't know what your current settings are but it's probably because it isn't stable with Ai Clock Twister Stronger the timings are probably to tight for that speed.
The same thing can happen with memory too. Tight timings give you better bandwidth but when they are to tight you will lose bandwidth.
But I have to say that losing 1200MB/s is a lot.
You might want to try Ai Clock Twister at stock speeds to see if the same thing happens.
Edit:
I just did a test to try it out.
For my 8 X 450MHz, DDR 1199 and tRD 6 setup I gain 127MB/s Read, 0MB/s Write and 24MB/s Copy. I have to raise the NB Voltage from 1.33V to 1.49V to run the EVEREST Cache & Memory Benchmark with Ai Clock Twister Stronger. The timings with Ai Clock Twister Stronger are definitely to tight for that setup and is probably going to give stability problems.
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