Depending on your board's ability to support the 133MHz bus speed. The chipset has been proven 100% stable at that speed and beyond. The BX has dividers for 1/4, 1/3, and 1/2 for PCI/FSB, giving you the proper 33MHz speed for 133, 100, and 66MHz system buses, respectively. But it only has 2/3 and 1/1 AGP/FSB dividers, for the 100MHz and 66MHz system bus. So the slowest setting at 133FSB is 2/3*133=89MHz. Most AGP cards are very tolorent to this speed.
The "E" on the end of the processor ID means it's a coppermine, the "B" means 133MHz. So the following processors are 100 MHZ FSB:
500E, 550E, 600E, 650E, 700E, 750E, 800E, 850E, 900E (rare), and 1000E (very rare).
The following are 133MHz FSB:
533EB, 600EB, 733EB, 800EB, 866EB, 933EB, 1000EB.
Notice that only a few speeds are available at both bus rates. Since the multiplier is locked on the CPU, any motherboard that supports Coppermines supports all of them, but running a 133MHz FSB processor at 100MHz FSB, means it will run at a 25% slower clock speed.
Having said that, you're best off running at 133MHz FSB for the added memory performance.
The difference in performance between AGP2x and AGP4x should be around 7%, a little higher for the newest cards. But the BX chipset outperforms the i815E by a similar amount in other areas, such as memory performance, making it a perfect tradeoff.
What's the frequency, Kenneth?
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