Never mind, after hearing this argurment both ways for so many years, I finally decided to look it up myself:
"Although AGP 1X mode operates at 266Mbytes per-second, how many bits is it? If it's two times faster than PCI at 32 bits, is it a 64-bit slot?
The AGP bus is 32 bits wide and the bus frequency is 66MHz. This compares to PCI at 33MHz and 32 bits, so AGP 1X mode data rate can be described as two times that of PCI. Stated another way, PCI data rate is 33 million transfers-per-second times 4 bytes (32 bits) for a maximum data rate of 133Mbytes per-second. AGP (1X mode) data rate is 66 million transfers-per-second times 4 bytes, for a maximum data rate of 266Mbytes per-second. AGP 2X mode uses a 66MHz clock, but data is transferred on both edges of the clock for 133 million transfers-per-second times 4 bytes, for 532Mbytes per-second maximum data rate. "
<A HREF="http://support.intel.com/support/technologies/graphics/agp/24237.HTM#4" target="_new">http://support.intel.com/support/technologies/graphics/agp/24237.HTM#4</A>. So now I'm on the other side of the argument. Those 64-bit 66MHz PCI server slots are starting to look more and more attractive for PC's.
What's the frequency, Kenneth?