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To: Scumbria who wrote (114558)6/6/2000 10:58:00 AM
From: pgerassiRead Replies (1) of 584188
 
Dear Scumbria and Thread:

I was just reading the pdf for the Socket A thunderbird:

http://www.amd.com/products/cpg/athlon/techdocs/pdf/23792.pdf

On page 38 at the bottom it reads that the FID, Frequency ID (read clock multiplier) is sampled from these pins after the PWROK is asserted till RESET# is deasserted.

This would mean that overclocking could be done from the motherboard itself via either DIP switches or some non volatile memory read. It also could be done on a warm restart. For example after the CMOS is read and the BIOS could reset the multiplier to whatever is desired. Thus even Abit's Soft Menu could allow us to change the multiplier and the voltage "On The Fly" before any reboot of the OS. The initial setting could be left to the CPU.

This allows the end user to overclock but forces the package to report the AMD factory set settings during initial power on. This gets rid of most quick and dirty remarkers which is good for AMD but still allows us, the consumers, to overclock just fine. So the Socket A version is no less and may be an easier overclock than the Slot A versions.

Pete

PS: The Socket A multipliers range from 5.0 to >= 12.5. Or between 500Mhz to 1.25Ghz on 100Mhz EV-6 (200Mhz DDR) and 633Mhz to 1.67Ghz on 133Mhz EV-6 (266Mhz DDR). Thus at least the Socket A versions will allow for higher clocks than the Slot A versions in the future. Even 2.5Ghz may be possible given 200Mhz EV-6 (400Mhz DDR) as the current defined EV-6 Maximum rate.

Also VIDs range from 1.125V to 1.850V in .005V increments.
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