Originally posted by: oldfart
for a 150fsb / 400DDR id recommend the Asus P4S533.
Why? Your own testing has shown the SiS to be slower and not as good an overclocker as an 845 setup. You also give up the PCI/AGP lock, and get lower IDE performance. There are better boards to do a 150 FSB DDR400 setup. EPOX 4BDA(2+), 4BEA(2+), Abit BD7, BD7II, IT7, Gigabyte 845E is also a good board. The ASUS 845 boards have a major flaw that they do not allow 3:4 above 132 FSB. I dont at all consider them the best overclockers for that reason. They also have a lower Vcore range than other boards. If you plan on overlocking to a higher than 150 FSB setup, it doesn't really matter since you wont be able to run 3:4 anyway. The question is, "Do you feel lucky?" If you get a good CPU that will run in the 160+ FSB range, 1:1 mem is all you can use. If you get an "average" CPU, that tops out ~ 150 FSB, you want the 3:4 to get the best performance.
For how long you have been here, you don't read much, eh?
There's a difference in the Asus P4S
533 and Asus P4S
333.
The P4S333 can only support DDR333 at stock speeds (and up to 133fsb), while the P4S533 can support DDR400 at stock speeds (and up to 133 fsb), along with having many other enhancements, like ATA 133 support.
The i845 chips aren't any contest in comparison to the SiS645DX chipsets. They're an entire generation behind. The i845 doesn't have officialy DDR333 support, let alone DDR400 support.
The tests run by Thugs are inconclusive since to get both mobos running the RAM at DDR333 he has to raise the fsb on the i845 mobo
much higher than the SiS 645 mobo. The fact remains: The P4S533 may not get as high of a clockspeed as the i845 chipsets due to the lacking agp/pci lock, but it will give more bandwidth due to the extra dividers.
The thing about not being able to boot above 147 is one of two things:
1. Poor overclocking skills (which I doubt)
2. Bad luck and getting a lemon mobo (which is likely)
My P4S333's running at 153fsb (or in reality 612mhz fsb) with a 4:5 memory divider, perfectly stable.
I'd go higher but my Kingmax RAM can't hit any higher than what it's at all ready.