By the way, these CTL sticks I got suck *** bad. They showed promise, but they got worse after burning in. These are dated 0225. They do not like 2.8 volts at all, and stability gets worse in some situations.
Best they will do is around 166, 2-2-2-5. They will do 193 mhz max at something like 2.5-3-3-6. I burned 'em in twice, at 2.5 and 2.8 volts (highest my board will go).
But I do have one tough Mutha-board on DDR: MSI 645E MAX-LRU. My 0208 CTL sticks did 200, 2-2-2-5-1 on a P4S533 and can only muster 180 on this board.
The 512 MB DTL stick I got will do 170, 2-2-2-5, and will do DDR400 at 2.5-3-3-6.
An XMS3200 will do 175 at 2-2-2-5, but won't do DDR400 at all.
So a lot depends on the motherboard. The P4S533 is pretty much a pushover and it's easy to hit DDR400 at fast settings on it, but memory scores leave much to be desired.
BTW, I tested the XMS3200 on a P4B266-E and it will do DDR426. Wow, 512 MB at 160 FSB, 3:4. Though the settings are locked at 2.5-3-3-7 I get 3200/3100 Sandra marks so good enuff. Tested stable in 3D. Only one of my good 0208 CTL sticks will do DDR426 on the same board.