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Hi,
got an XP 2200 (T-bred 266MHz) on an MSI MS-6382. CMOS will let me change FSB clock and PCI clock and I've got it currently running at 1931MHz with CPU temp still around 35-36C so I'm tempted to go further (maybe get 2GHz?!) although I don't really know anything about overclocking the PCI clock so I'm kinda wary about increasing it too much. Is there a limit to how far I can push it? And knowing this is how I'm overclocking, is there a good cpu stress test I can run to test the stability of my system? Or anything else I need to worry about? Many thanks!
You should NOT overclock the PCI/AGP bus...lock them at 33/66mhz & just overclock the CPU/RAM.
Asus A7N8X-X
1800+ @8x210mhz
512mb PC3200
Ti4200/8X 128mb
WDC 60GB
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Can't unfortunately, it's just one setting in CMOS that changes the FSB and PCI Clock at the same time. What's the danger in doing it? Also, I'm using Speenfan to watch my CPU temp however I've noticed that the CPU usage is always 100%?! Is this cause of the overclock? Cheers!
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You're at 143Mhz now? You'll need to get to 148Mhz to make ~2000Mhz and that'll put your pci freq at 37Mhz. If you can even get it there, that number puts you pretty close to pci problems...
If that board allows you to lock the agp and pci bus at 66/33 you'll have a much better chance.
A good stress test? Yep, a couple of them:
http://www.geocities.com/btvillarin/Downloads/Toast.zip
Unzip toast.zip and just click on toast.exe; let it run for 10-15 min as you monitor your cpu temps. They will go up dramatically. If toast locks up, you've gone too far.
Another is the SiSoft burn in wizard in SiSoft Sandra; not as demanding on the processor as toast but checks more of your system. Again, if it locks up you've gone too far.
Another practical stress test is to play a modern game for a half hour or so.
My MS6330 motherboard will clock up to where you want to go but only with raising vcore (lots more cpu heat generated) and occasional lockups.
Monitor cpu temps with MBM5 or SpeedFan so you can see what's going on as you stress the cpu.
Now's a good time to grab a notebook and write everything down...you won't remember what worked best later.
Skip
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Hi Skip,
yeah I'm currently at FSB 147MHz and PCI clock 37MHz giving me 1993MHz CPU. Just ran toast for 15mins and temperature was 52C at the end of it, system is running fine though. Haven't downloaded Sandra yet but I'll post back when I've got some results. What are PCI problems? The only PCI card is a modem if thats relevant?! It's just the next step in the CMOS is FSB 150MHz and PCI clock 38MHz and I'm really tempted....
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Onboard components like onboard sound is also connected by the PCI bus and AGP is only an extention of the PCI bus so it too runs at two times the PCI clock.
Most PCI cards and components will work up to 37 or 38MHz but somewhere around that you may run into problems. The card or the whole system may become unstable around that mark but to know for sure you have to test it out.
Going in small steps I never fried a PCI card until now.
My old Asus P2B Slot1 board goes up to 112MHz which makes a PCI of 37,333....MHz. The next possible inofficial step would be 133MHz which would run with the PCI cards because the chipset will raise the FSB to PCI divider from 3 to 4 but my two ISA card will not do.
If you can set such a devider manually you can try it. Running the PCI a bit slower shouldn't be a problem but above 38MHz you will soon run into trouble because PCI components are only meant to run at 33MHz and the graphic card will reach 75+MHz instead of the original 66MHz.
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Oh oh! i'm having trouble with my onboard sound now, is it possible I've fried it by raising the pci clock too much?
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clock back to stock setting of 133MHz and see if sound appears again.
which makes a PCI of 37,333....MHz
Thats a LOT of PCI speed...hehe??
who knows, may in a couple of years ;)
Good Luck and Happy Computing,
Kailas Shastry,
Sempron 2400 underclocked to 1GHz...just for the heck of it! MSI KT266VM
DDR 256MB
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Problems tend to arise when the PCI speed hits about 37-38mhz, but it varies from rig to rig - some hardware can take it, some can't. Sounds like your's can't....
Asus A7N8X-X
1800+ @8x210mhz
512mb PC3200
Ti4200/8X 128mb
WDC 60GB
0
That's about the speed my board goes to hell.
Here's one thing to consider after you're done playing with the overclock thing:
Although I like to see my 2400+ running at 2600+ speeds, my favorite setting is at 133 or 134Mhz and vcore undervolted from 1.65v to 1.60v. CPU temps drop about 10°C and I can get a higher overclock on my video card.
Performance differences only show up in benchmarking utilities and video benchmarks remain about the same.
It's nice to overclock but not always worth the effort on the motherboards we're using here. Gotta admit though that I like seeing 2600+ at post.
Skip
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Hey,
is it possible this overclocking would afect my IDE drives? Hard drives are fine but CD-ROM and CD-RW drives on IDE2 channel are acting funny, taking ages to read a CD if they ever do?!
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Yes, that's one of the things we talk about when we mention data corruption. If you push the fsb 1 or 2 Mhz higher you'll probably see about the same thing happen to the hdd when it tries to read and write data. It's time to back off a bit.
Skip
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I guess I've been lucky over the years, because I've run the PCI bus to the low 40s on many different boards, with a large variety of hardware with no problems. I ran my KT333 8K3A+ at 209 FSB with no problems for close to a year (I retired it from my primary system because of bad caps. I've since repaired it, and it is running strong again). My CDRW was the weak link though. Anything over 209 bumped the PCI to 42 MHz, and it wouldn't burn properly. All other components were ok up to 214 MHz FSB.
And I've set up many Socket 7 sytems using the 83 MHz bus, and I've yet to find any hardware that won't work at that speed.
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I hae a PII233 happily running at 83Mhz too. I also have a PII300 that absolutely will not run stably at anything over 66Mhz.
Kinda the luck of the draw; but shuck and I are only two of many who have run into problems with the pci bus in the 37~38Mhz range.
I also recently clocked a "crummy" Chaintech board and Duron1400+ combo to 156Mhz with no problems whatsoever and no agp/pci bus lock.
the quest by shuck to make a 2400+ out of his 2200+ is pretty close. He may make it and he may not...time will tell.
Skip
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Hello
sorry for bad english
I am running Ga-7DX with FSB at 119Mhz witch turns PCI to 39Mhz. Its running like this since 3 years andno problems where found.BUT!
The PCI components are:
Sb Live! : Extremelyhigh temperature over the emu10k. Dont know if this is common, but now is with a heatsink.
Miro Dc10Plus : This is what a worry a lot!. Until now some hangs under windows XP (but is common because it didnt have drivers)
Networks Adapters : Well no problems at all. The only thing to say is that when copying files it have a 512Kb/s and not 1Mb/s ( meabe the HUB? )
Ok now the AGP
Geforce 2 Pro : No problems, exept that when I DONT OC IT ,sometimes appear lines and dots ...I SAY DONT OC ..thats the strange thing. (when I say DONT OC is that agp is running at 66Mhz,not OCing the memory or GPU)The good things!
i see that the system is solid rock, meabe because is a motherboard for this (GA-7dx with AMD761) and the system is running a lot more speedy :) .
I think I win 15-20 fps! in some games
Example NFS U2 at 1280*768*32 at full quality no FAA. Runs from 25-30fps and sometimes 45fps when there are no opponents.
Great video card, it is 4 years old or more and buy it around 220Us.
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