To ww4397,
I got this info from a Japanese site:
It's by Twinmos (not Kingston), but the chips are the same: Winbond W942508CH-6 306WG. PCB is different (GB3-212B)
At 2-5-3-2, it does 210-220MHz at 2.6V-3.2V (this is very high...)
At 2-5-2-2, it does 177 at 2.6V, 187 at 2.9V, and 210 at 3.2V
I don't know how he could apply such high voltage, but at least it tells what is can do.
i tested at 177MHz, at 2-5-2-2 with 2.5V, and there are errors in MEMTEST. But as I stated in earlier post, it does 2-5-2-2 at 166 with 2.5 V with no problem.