"Bad" FSB settings?

[yllus]

I can't recall exactly the place I read this, but it was along the lines of "don't use a FSB setting of 81 or 83" because of some reason or another. Could someone reiterate for me what settings to avoid and why? Or am I just totally off the mark here?

 

[Mikewarrior2]

well, an 83fsb means a 41.5 mhz PCI, which can cause major headaches.


Mike

 

[they call mr big]

alot of older hard disk crap out on the 41 mhz bus so be careful.I had no problems with the 83 mhz bus

 

[BlueDeathscreen]

Mr Big: Actually, a lot of newer hdd:s might also take serious damage if you run them at 40+ MHz for a long time. Furthermore, many sound cards sound like crap if you get that high. Also, many cheap network adapters die already at 38 MHz. So I wouldn't really go above 38-40 MHz on the PCI unless I really had to...

Edit: that looked very "mean" when I said it like that... Sorry, but the hdd:s really can take a lot of damage, especially in DMA. But you're right that older hdd:s are more sensitive, of course.

 

[Renob]

do not use a 83fsb i killed a new IBM deskstar GXP-75 a few months ago on my old cel-2 system running a 83fsb for only 1 day so all i can say is Danger Danger Danger.............

 

[yllus]

Of course, the PCI divider! Thanks guys, that makes inherent sense. I just took a look through MSI BusRacing like I should have in the first place, and it says:

FSB: 75.0 = PCI: 37.5
FSB: 78.0 = PCI: 39.0
FSB: 81.0 = PCI: 40.5
FSB: 83.3 = PCI: 41.7
FSB: 90.0 = PCI: 30.0

Looks like I'd have to jump all the way to a FSB of 90 Mhz to maintain a safe PCI clock speed. Would I run into any problems with a lower-than-normal PCI speed of 30.0 Mhz? I've switched to a FSB of 75.0 for now.

 

[BurntKooshie]

you'll be fine "underclocking" it.

 

[han888]

i run my system for 3 week already with 41 pci bus speed, until now the system is still ok

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