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Abit KT7A: Duron 650 not stable at over 150 MHz (UPDATED: 3rd Feb)

L

limsandy

Golden Member
Hi, my computer spec is:

Duron 650 (multiplier locked)
Abit KT7A (KT133A week 52)
PC133 512 MB (Infineon chips)
Generic Casing
GW FOP32

I tried all different settings and found out that my memory is stable at 150 MHz CAS2. My system rocks stable with memory interleaving and all other eye candy settings turned on.

Right now, I am running 140 MHz (FSB Plus = 10) and trying to increase the FSB to 155 MHz. CPU temperature is 70-80F, CPU voltage is 1.800V, (AGP?) voltage is 3.6V, CAS is left at 3. I have dificulties increasing the FSB by a mere 5 MHz. I also tried booting at 155 MHz, at 1.85V. It could load windows but locked up as soon as I opened "my computer".

Can someone tell me what to do to achieve 155 MHz and rock stable?
Thanks.




UPDATE:
Ok, now I want to settle for 150 MHz. The problem is that it's not stable when I close my computer case. (temp rise from 80F to 100F) What should I do if I want my case closed? Or is it ok to leave my computer naked and let all the dust form in there? Has anyone actually have open case systems?

 
it's probably just the limitatoin of the CPU or the Northbridge.
I have a very similar system setting as your.
 
It's either the RAM or the KT133A northbridge. I smell a KT133A overclocking article brewing on AnandTech. . .

Modus
 

Bah, my KT133A chipset is week 52.
Shouldn't be a problem with that.
I ordered my memory from memman.com
They claimed the memory can do 142 MHz at CAS2 and 161 MHz at CAS3
Yet, I can do 150 MHz at CAS2

What I believe the problem is my power supply unit (PSU). Is 250 W enough to overclock this baby to 155 MHz (1007.5 MHz) ???

 
have you ever heard of not every processor are created equal? Same applies to every other silicon products.
Why can't you just face it? North Bridge itself is a very possible spot, if you insist it's not the NB, then it might very well be your CPU then. I don't think it has anything to do with your power supply.
 
I have heard that rumor about the week of the KT133A northbridges affecting overclockability, and I don't think it has been proven..just someone's idea I think.
 
Your problem could have nothing to do with the Northbridge or you cpu. At 155 your overclocking both your PCI and AGP busses. Your HDD could be freaking out. Maxtors are known to have issues with OCed PCI.
 
<trying to increase the FSB to 155 MHz>

what is the duron rated for??? Not 155

<70-80F> WTF are you Thinking? About to get a keychain...
 
Check out the anand article on the new MSI K7T turbo. It appears all the KT133A mb's top out around 145-147 MHz FSB. So you probably have little chance of getting the FSB that high.
 
nweaver, 70-80F is NOT by any means hot...Fahrenheit...not Celcius! 😉

Probably the AGP bus not being able to handle it...what video card are you using? Could also be the HDD.
 
70-80 F How he heck can you be so low My duron @ 1GHz will only go down to 100F there no way it could be as low as 70F at 1.8 Vcore not overclocked. you must be reading that off Sandra.
 
Naw, 145mhz is far from the max. The Iwill KK266 has hit 165mhz. It has fairly conservative memory settings so thats not a problem. Most good quality AGP cards will handle the increased AGP bus speed BUT watch out for PCI devices, especially HDDs.
 
mhm.

my friend runs his abit kt7a with 157 mhz (tbird 900@7x157 mhz).

he only have a geforce2 and a sb128 pci in his system.

good 150 mhz ram (dont know the brand), alpha 6035 cooler with high speed fan, enermax powersupply (has a second fan witch cool the cpu too).

he is very lucky with the abit.

i have a epox 8kta3 and my duron 800 runs with 8*140 mhz.
i think i can get higher with better ram (i only have noname pc133 cas3 ram).

Check out the anand article on the new MSI K7T turbo. It appears all the KT133A mb's top out around 145-147 MHz FSB. So you probably have little chance of getting the FSB that high

you should read some hardwaresites with better ram then anandtech use 🙂

145-147 mhz is a joke for a good kt133a system with good 150 mhz ram. 🙂


 
I've seen 160mhz+ fsb on an epox 8kta3...but big deal - it's rare...

it coudl be many things causing the inability to operate at 155mhz fsb, but it's probably your RAM or northbridge.

why don't u unlock your cpu and set the multiplier lower to rule the CPU out...then it would have to be your RAM or northbridge...and if the company is claiming that particular ram does 160+ @ CAS3 for the RAM, then it's probably the northbridge...it's doesn't matter which frickin' week it was made...

you can also set the pci clock ratio lower (i.e. 5) to rule out PCI devices...

you can also upgrade the week of your northbridge...send the northbrdige to myself, and i'll upgrade (pee on) it for a measly $1.32...think about it - an extra 9 weeks overclock...FAST.
 
DaddyG:

I am running the PCI at 35 MHz.....
See it's running at 140 MHz
FSB Plus = 10 MHz
So it's 150 MHz
I am using 3d Prophet Geforce 256 32 MB and Seagate 20.6 Baracudda ATA/66

 
nweaver, Mustanggt:

I opened my windows at night and let the cold breeze blowed my entire case (opened)
Anyway, it's still winter and it does get below 50F at night where I live.

Again, I am using Infineon PC133 at 150 MHz, CAS2
I tried switching it back to CAS3 and increased CPU voltage to 1.85V, but still no go.

WHY?
 
Lots of people have already told you its most likely the chipset! 150 is about average for KT133A OCing. If you don't want to accept it then well, we cant help you there.
 
Try active cooling on your chipset. That about the only thing you can do to help make it to 155. or make it more stable at 150. Unless you really want to get extreme and try liquid nitrogen.
 
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