How can I OC more? 1700XP+

[calvink]

I'm having problems OC'n to hit the 2000Mhz mark. I can't oc any higher than 12.5 * 144fsb with this setup. My CPU vcore is at 1.625 and i tried to increase the DDR voltage to 2.7v but it didn't even help by 1fsb. I got it up to 1938Mhz (12.5 * 155), using out of sync memory timings (155-33=122), but that isn't a good idea. I don't know why it's hold me back at 155, either... My board lets me change the fsb up to 220. Any help, is appreciated. Thanks.

Windows XP Professional
AMD 1700+ XP T-Bred B 0302 @ 1.741 ~2100+ XP
MSI K7T266 Pro2-A (6380E)
Thermaltake Volcano 7 HSF Idle: 38C, Stress: 42C (Night: Idle 32C, Stress 35C)
512Mb Samsung PC2100 CL 2.5
64Mb Radeon 8500 Retail
Creative Audigy! OEM
Seagate Barracuda IV ATA 100 80Gb 7200rpm
16X/48X SD-M1612 Toshiba DVD-Rom Drive
Verbatim(AOpen) 48x12x50 CDRW

 

[ChampionAtTufshop]

it could be the ram
but definitely up the vcore more....atleast to 1.7 or 1.75 lol
you are only giving it 0.025v more than stock i think


but the ram thing makes me wonder if its the ram.....
do you have any other ram, or a friends stick, that you could try out? (higher than pc2100, atleast pc2700 or so)

 

[BigJ]

My greatest guess is that you're limited by your PCI divider. Most likely it has a 1/4 divider, so you being at 155mhz FSB = 38.75 PCI bus, and a 77.5mhz AGP bus. Those are quite high to run your HD and Video card on, and may, just may cause data corruption and hard drive failure. 144/4 gives you a 36mhz PCI and a 72mhz AGP bus, which is what my old MSI KT333 also maxed out at. My guess is that this is definitely a PCI and AGP limitation due to the divider.

 

[ChampionAtTufshop]

does it give you a "so and so file cannot be found or is corrupted" error?

it could also be the lack of a 1/5 divider as statedabove , if there is one

 

[bgeh]

Originally posted by: BigJ2078
My greatest guess is that you're limited by your PCI divider. Most likely it has a 1/4 divider, so you being at 155mhz FSB = 38.75 PCI bus, and a 77.5mhz AGP bus. Those are quite high to run your HD and Video card on, and may, just may cause data corruption and hard drive failure. 144/4 gives you a 36mhz PCI and a 72mhz AGP bus, which is what my old MSI KT333 also maxed out at. My guess is that this is definitely a PCI and AGP limitation due to the divider.

i agree. i own the MSI KT266PRO2-RU(same as you but i have raid and usb 2.0)
it doesn't have the pci lock
you shouldn't overclock your pci bus
it may cause serious hard drive corruption over a period of time

 

[panhead49]

you shouldn't overclock your pci bus

it may cause serious hard drive corruption over a period of time\


come on ....you should.nt chew your nails eirther but we all do........up the voltage....little at a time...let it run in awhile at each increase....go for it!!!....life is short......

 

[bigpow]

calvink,

try using lower multiplier with very high FSB

It works for me!


😉

 

[BigJ]

Haha you guys are going to have him absolutely fry his PCI devices and everything on the channels. The MSI KT266A board only has a 1/4 divider, so having him say for a lower multiplier (say 9) and a FSB of say 166, will w/o a doubt fry something.

 

[ChampionAtTufshop]

well if it doesnt have 1/5 divider go as far as you can with fsb (pci is usually ok until 35-36mhz...even 37 at times) and u can either stick with highest mult available (12.5x) or hard mod a specific mult from ocinside.de 's cool little program thingy

 

[Killrose]

First off your board only supports a 1/4 PCI divider, so running your PCI devices above the 38MHz level can cause some problems. If you are'nt willing to chance it, and the highest multiplier you have is 12.5, then you dodn't have a choice but to buy a KT333/400 which has a 1/5 divider or an nForce2 which will lock the PCI.

But you need to raise the voltage on that bird if you are having lock-ups, or other problems with the highest settings you are currently trying to use. 1.7v would be a good place to start.

 

[gplracer]

I bought an Epox 8RDA+. It has PCI lock so none of the items on the PCI bus are overclocked. My 1700+ does 12x180=2170mhz with just 1.675v. You might need another board.

 

[calvink]

Thanks for the advice, I think i'll be lowering the speeds now to prevent data corruption. I have the fsb at 139 now, but it's definiately not worth even 1mhz to lose any data. I started the voltage at 1.65V with no probs, so i've been slowly lowering it to 1.60V still with no problems. I ran a burn in test for 6hours, and there hasn't been any noticable problems either. 🙂 guess, I just got lucky with my cpu... too bad I can't OC anymore. I'll just play with my other system at home, a 2100+ XP T... since it's not worth upgrading this mobo. Thanks again.