Getting a Tualatin to 1.6 can be quite Difficult. Many wont make it. 1.5 is easily done. 2 GHz? Not a chance. Here is my take:
1.0a 10 x 150 fsb = 1500mhz
1.1a 11 x 136 fsb = 1500mhz
1.2 12 x 125 fsb = 1500mhz
My take:
1.2 @ 1500 @ 125 FSB is cool as long as you have a board with a 1/4 PCI @ < 133 FSB like an ABIT ST6. 125/4 = 31.25 PCI. If you don't have that feature (TUSL2), 125/3 = 41.6 PCI...not good.
1.0A @ 1.5 GHz will have a 150 MHz bus which will outperform a 125 MHz FSB. You have to have decent ram for this setup. The 37.5 MHz PCI is not far enough out of spec to be a problem.
1.1 @ 1.5 is a 136 MHz FSB. Also a nice setup. If you don't have great ram, this may be the setup for you. This setup also keeps the PCI and AGP bus very close to spec.
I like the 1.0a @ 1.5 the best. It will be the best performing system.
BTW, the caps lock key is the one on the left between the shift and the tab heys.