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Sputnik
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Sputnik
356 Posts
17 Aug 2003, 3:59pm

Safe PCI bus speeds?

Ok... i like to mildly overclock (nothing to crazy....yet) my CPU and was curious what are safe PCI bus speeds? right now i'm running a 177 MHZ bus on a NF7-S v2.0 with a barton 2500+ with the stock 11x multiplier, so i'm running my PCI bus at 35.4MHz (not much more than spec).

how far can i push it w/o hard drive corruption etc? 37MHz? 40MHz?
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TheLostSwede
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TheLostSwede
3,227 Posts
17 Aug 2003, 4:01pm
Sputnik,

One of the best features of the Nforce2 chipset is that it has locked pci/agp busses at 33/66 if you want.
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Park_7677
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Park_7677
667 Posts
17 Aug 2003, 4:01pm
ABIT NF7-S nForce2 has locked PCI speed (33MHz)

OC away!
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Sputnik
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Sputnik
356 Posts
17 Aug 2003, 4:37pm
it does? huh.... i somehow missed that.... probably misinterpretation of the crazxy 5:5 divider....

alright! time for a reboot!
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TheLostSwede
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TheLostSwede
3,227 Posts
17 Aug 2003, 4:45pm
What that 5:5 means is that you run memory and cpu in sync.
5:5 means FSB divided by 5 times 5. Take that speed times the multi and you have your effective cpu speed. If you have it set at let say 5:4 and 200 fsb, that means you have an effective fsb of 160. This is only for good usage if you have crappy memory that cant be used in high fsb but you have a fast cpu. Leave it at sync if possible.

What memory do you have? 1 stick or 2?
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Sputnik
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Sputnik
356 Posts
17 Aug 2003, 5:00pm
1 stick right of 512MB geil PC3200 (i plan on getting a second in a few weeks). i knew i could run them out of sync at stock speeds using the 5:6 divider, but i do run the 5:5 divider.

for some reason i thought (probalby just misread) that say you had a 375fsb using the 5:5 you would get a 35mhz PCI.... just missinterpretation.

i still am curious about the FSB question.... i have a KR7A-RAID motherboard with a old palomino 1700+ left over from my upgrade that i gave to my little brother, and have been wanting to push it a little further (running happily at 11x140MHz) so he gets a little bit of a boost with his games (or folding, what have you).
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Sputnik
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Sputnik
356 Posts
18 Aug 2003, 5:01am
c'mon guys... i know you know this sorta stuff.... i havne't done much overclocking so need your help
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Thrax
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Thrax
25,154 Posts
18 Aug 2003, 5:05am
The PCI/AGP speeds are forever locked at 33/66MHz.

The dividers are to allow different speeds between the RAM and the FSB (I don't even see why they included it).

Conceivably it'd allow you to run 133/200, 166/200, etc.

But it's pretty pointless, considering people all buy the memory according to the processor's FSB, or using memory better than his FSB.

The OLD way dividers were implemented (VIA did, and still do use them...Stoneagers) also adjusted PCI/AGP. Doesn't do it on Nforce2 boards.
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Thrax edited : 18 Aug 2003 at 5:08am .
Sputnik
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Sputnik
356 Posts
18 Aug 2003, 5:10am
that's exaclty what i's wonderign about thrax! i have a KR7A-RAID (VIA KT266a chipset) and because of the dividers was wondering how far i can push the FSB w/o data corruption because of an out of spec PCI bus?
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Sputnik edited : 18 Aug 2003 at 5:13am .
Thrax
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18 Aug 2003, 5:14am
Most KT266A boards crapped out at around 40 or 45MHz on PCI. SOME went as high as 50MHz...And SOME of those some went as high as 66.
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Sputnik
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Sputnik
356 Posts
18 Aug 2003, 5:17am
ok, thanks! so i'm gonna be pretty paranoid and stick the the 38-40MHz range on the PCI bus on that board
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Geeky1
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Geeky1
7,972 Posts
18 Aug 2003, 5:38am
Well, if it's any help, I run my MSI K7D Master-L with a 150MHz FSB, which is 37.5MHz PCI... and it runs fine with an Audigy2 Platinum, a HighPoint RocketRaid 1540 w/4 160GB Maxtors, and a MSI/NEC USB 2.0 card...
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muddocktor
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muddocktor
6,260 Posts
18 Aug 2003, 1:59pm
As far as PCI bus speeds go, I never have had any problems with hard drives or optical drives with a PCI bus speed of 37-38 MHz or so. I have had the Maxtor D740X hard drive in my P3S rig running on a 45 MHz PCI bus(180 fsb speed) before with no corruption problems though; surprised the hell out of me it was able to do it.
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MJO
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947 Posts
21 Aug 2003, 3:02pm
The PCI bus is locked at 33 Mhz.

But you are free to adjust the AGP bus in the BIOS.

I do not recommend it, but it is indeed possible.

I believe you can bump it all the way up to 99 Mhz.
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