Slot 1 FSB Overclocking - ISA, PCI and AGP buses come along for the ride? \ VOGONS

Slot 1 FSB Overclocking - ISA, PCI and AGP buses come along for the ride?

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First post, by Almoststew1990

Posted on 2020-05-01, 13:06

Almoststew1990 Offline

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I am doing a bunch of benchmarks at different CPU speeds. My CPUs are all 100MHz FSB models and i'm running them at 66 and 112MHz as well to get a range of CPU speeds to test at.

My question is, if I do this, will it decrease and increase the ISA, PCI and AGP bus speeds? (I would rather it didn't!)

The motherboard is an MSI 6119 Slot 1 with a 440BX chipset.

Reply 1 of 1, by darry

Posted on 2020-05-01, 15:54

darry Offline

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From https://en.m.wikipedia.org/wiki/Intel_440BX

"Unfortunately, running a 440BX above 100 MHz FSB resulted in the AGP video card being forced to run on an overclocked AGP bus, as the 440BX only had "2/3" and "1/1" bus dividers. Some video cards were tolerant of this, such as various early NVIDIA GeForce cards, but more than a few were unstable with a 35% AGP overclock.[2] The PCI bus was not affected by this problem (there was a "1/4" bus divider for the PCI bus on the 440BX) so users could use a PCI graphics card in lieu of an AGP one."

If memory serves, not all 440BX supported use of the PCI 1/4 divider .

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