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How can i keep my PCI Bus below 39mhz, while going for a 2gig OC

post #1 of 12
Thread Starter 
The Chip is an AMD 2000+XP T-Bred "B". It's currently at 144 FSB, 12.5X Mult, 1804Mhz w/ a 1.66Vcore. The PCI Bus is at x36Mhz according to Sandra, so i'd like to make sure i don't cross the limits as i've heard it can cause your Drive/or Drives to fail, along with other nasty issues.

I've been OC'ing for many years now, but i always had the issue of getting worried of my system failing in one way of another. And although i've always gone to the extreme when it comes to hardcore Vcard OC'ing, i still have always been a bit scured with pushing my CPU to the limit.

I usually end up happy with a 100-200mhz increase, whilst being stable through a long Torture/Burn in test. But i'd like to reach atleast 2.0Gig, or 166 fsb as my mb supports up to 200 fsb. I can change every specific voltage settings, the multiplyer, ram clocks and timings etc etc. Although i may have an older Motherboard, it sure has great OC'ing abilitys.

Thx.
PC
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Athlon 2000+ XP "B" @ 1804mhz MSI KT4V PNY 7600GS 512mb Samsung 
Hard DriveOSMonitorKeyboard
Western Digital 7k Rpm's Windows 2k xp 19 Inc Philips Monitor Sony 
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AMD Athlon 2000+ XP "B" @ 1804mhz MSI KT4V PNY 7600GS 512mb Samsung 
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Western Digital 7k Rpm's Windows 2k xp 19 Inc Philips Monitor Sony 
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400 Watt Brand Y Case by AMD Optical AMD 
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post #2 of 12
You need to lock the PCI frequency at 33MHz, you can do this in the bios usually, but your board does not have a PCI/AGP lock, so you are kinda screwed in this regard. Your motherboard is not suited at all for overclocking really, it has the KT400 chipset right?
post #3 of 12
If your mobo doesnt have pci/agp lock, then you may not be totally screwed. My board doesnt have it either but i am able to pull a decent oc because my pci/agp bus will snap back to 33/66 after it hits a certain ceiling. Example, at 3.2ghz, i lose sound because the pci/agp bus is clocked too high. But at 3.59, it is fine, because the pci/agp bus got higher and higher and then snapped back to 33/66. Do you get what im saying? You have to find the sweet spots.
post #4 of 12
Thread Starter 
Yeah i've never noticed the lock, but yes, it's an Apollo KT400 A.Thx for the info guys, as i'll go check for the Lock within the bios.
PC
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CPUMotherboardGraphicsRAM
AMD Athlon 2000+ XP "B" @ 1804mhz MSI KT4V PNY 7600GS 512mb Samsung 
Hard DriveOSMonitorKeyboard
Western Digital 7k Rpm's Windows 2k xp 19 Inc Philips Monitor Sony 
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400 Watt Brand Y Case by AMD Optical AMD 
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PC
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CPUMotherboardGraphicsRAM
AMD Athlon 2000+ XP "B" @ 1804mhz MSI KT4V PNY 7600GS 512mb Samsung 
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Western Digital 7k Rpm's Windows 2k xp 19 Inc Philips Monitor Sony 
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400 Watt Brand Y Case by AMD Optical AMD 
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post #5 of 12
Thread Starter 
Yeah, theres no option to lock the PCI Bus, but i can live with that. I was also wondering if raising the multiplier, but keeping the FSB low enough so that the PCI Bus doesn't exceed to high of a mhz(37-38) may be the highest i'm willing to go.
PC
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Athlon 2000+ XP "B" @ 1804mhz MSI KT4V PNY 7600GS 512mb Samsung 
Hard DriveOSMonitorKeyboard
Western Digital 7k Rpm's Windows 2k xp 19 Inc Philips Monitor Sony 
PowerCaseMouseMouse Pad
400 Watt Brand Y Case by AMD Optical AMD 
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PC
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Athlon 2000+ XP "B" @ 1804mhz MSI KT4V PNY 7600GS 512mb Samsung 
Hard DriveOSMonitorKeyboard
Western Digital 7k Rpm's Windows 2k xp 19 Inc Philips Monitor Sony 
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400 Watt Brand Y Case by AMD Optical AMD 
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post #6 of 12
Quote:
Originally Posted by Jimston View Post
Yeah, theres no option to lock the PCI Bus, but i can live with that. I was also wondering if raising the multiplier, but keeping the FSB low enough so that the PCI Bus doesn't exceed to high of a mhz(37-38) may be the highest i'm willing to go.
Good thinking, keeping the fsb as low as possible will also keep the pci/agp lock as low as possible.
post #7 of 12
You won't get too far though, the KT400 can barely run PC3200 memory at PC3200 speeds, and sure won't be able to go any higher. Good luck, be sure to stability test any overclock before thinking it is stable, odds are the chipset will be the limiting factor here.
post #8 of 12
Thread Starter 
Running stable @ 2083 166fsb, stock voltage, for 15 hours now, Prime95.
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AMD Athlon 2000+ XP "B" @ 1804mhz MSI KT4V PNY 7600GS 512mb Samsung 
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Western Digital 7k Rpm's Windows 2k xp 19 Inc Philips Monitor Sony 
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400 Watt Brand Y Case by AMD Optical AMD 
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AMD Athlon 2000+ XP "B" @ 1804mhz MSI KT4V PNY 7600GS 512mb Samsung 
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Western Digital 7k Rpm's Windows 2k xp 19 Inc Philips Monitor Sony 
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post #9 of 12
Very good OC for that CPU/Chip set combo
    
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500G WD Black LiteOn CD/DVD R/W Win7 64 22'' ws Acer AL2223W 
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CPUMotherboardGraphicsRAM
X4 965 ASUS M4A79 Deluxe 9800GTx2 2x2G OCZ Reapers 
Hard DriveOptical DriveOSMonitor
500G WD Black LiteOn CD/DVD R/W Win7 64 22'' ws Acer AL2223W 
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MS KU462 Natural SS DA750 MS 5 button 
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post #10 of 12
Thread Starter 
Thank you

I just can't see how the cpu is running at 2.083mhz, 166 fsb, and stock voltages(1.65), without any drawbacks or instability. Infact i'm beginning to think that my chip is a 2600+ in disguise seeing as it's perfectly stable now after about 20 hours of Prime95, while also running 5-6 or more applications at diferent times throughout the torture test.

So it gets me thinking that the chip/mb/ram has even more potential seeing that everything was fine at 148fsb, as my pci bus was x37mhz, agp bus was the same, and my 1.5+ gigs of pc3200 was also stable after hours of both prime95 and memtest. I had heard that my board had a hard enough time running ddr333-400, although that is probibly hear say...

I'm not trying to brag or anything, just very happy since this PC was sitting in my graveyard for 3+ years after having major issues with it, as over 3 years ago it died on me, and i had spent days, weeks, and even a few months trying desperately to get it back up and running after so many hours of process and elimination, only to put it back together again, to have it OC nicely lol.

Sorry for the rant hehe, i may be loaded with to much caffeine
PC
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Athlon 2000+ XP "B" @ 1804mhz MSI KT4V PNY 7600GS 512mb Samsung 
Hard DriveOSMonitorKeyboard
Western Digital 7k Rpm's Windows 2k xp 19 Inc Philips Monitor Sony 
PowerCaseMouseMouse Pad
400 Watt Brand Y Case by AMD Optical AMD 
  hide details  
Reply
PC
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Athlon 2000+ XP "B" @ 1804mhz MSI KT4V PNY 7600GS 512mb Samsung 
Hard DriveOSMonitorKeyboard
Western Digital 7k Rpm's Windows 2k xp 19 Inc Philips Monitor Sony 
PowerCaseMouseMouse Pad
400 Watt Brand Y Case by AMD Optical AMD 
  hide details  
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