help with a duron900 o/c???

[iamthesystem]

I've had my duron 900 up and running on a MSI K7T Turbo mobo for a solid month now...maybe closer to two months.

things are going so well with this machine, I've decided to pump it up a bit and o/c.

I have a GlobalWin FOP32-1 on the chip and cracking RC5 all day will raise the temp to no higher than 42C, depending on room temp it usually hovers right at 39C.

I have not unlocked the chip--still 9x multiplier.

here's the rub: when i try and up the fsb to anything above 105, the machine operates fine, cpu temps are normal, but when i try and reboot, the monitor goes into power saving mode and the hard drive light shows some activity--but the monitor never comes back on.

if i unplug the machine for a few seconds, then plug it back in, the machine comes back up fine...

i don't know what's going on or why i can't push the cpu to 110-120 fsb...

here are my machine specs (in detail):

AMD Duron 900
MSI K7T Turbo
Voodoo3 2000 PCI
SBLive! Value
Linksys LNE100TX NIC
Maxtor Diamondmax ATA/100 15.3GB
Seagate Bigfoot ATA/33 8GB
Plextor Plexwriter 12/10/32A
generic 3 year old floppy drive
Viewsonic PS775 monitor

Memory:
128MB Mushkin Rev1.5 PC133
64MB Kingston ValueRam PC100
64MB Generic PC100

-----------------------------------

I've removed all of the PC100 memory, too...no difference

good ventilation, too...5 system fans bringing
the internal case temp to near room temp.


why am i having trouble doing a simple fsb overclock?

thanks...

 

[dietrologia]

From the extensive readings I've done, my guess would be that you're hitting the "performance wall" for your particular VIA133 chipset. Some people can get higher FSB than others. I would guess that your board tends more towards the lower range of FSB overclocking.

You could also try less aggressive settings on your memory.

You could also try bumping up the I/O voltage a tad.

 

[iamthesystem]

well, this mobo is a KT133A, is it not?

also...i've tried lowering memory to 100MHz, CAS3...no difference...

this motherboard has settings up past 133MHz...and was reviewed as an
excellent overclocker on anandtech...

i can't figure out what is going on...

 

[SleepyGuy]

yep the msi kt7 series boards have been known for this problem (reset prob). as for not getting past 105... your not gonna probably get 9x133 outta that chip (1200 Mhz)... maybe if you unlock the multiplier and lower it then bump the fsb that'll work, i'd say something like 7*140 is feasible. I have a MSI KT7 Pro2a and a Soya kt133a Pro board at home... the MSI is stable at default speeds but OC the Soya KILLS it!!! peace out.

 

[iamthesystem]

i guess what i want to ensure is that none of my components are holding me back (like the voodoo3 or linksys nic)...

 

[OCnMan]

The MSI K7T Turbo mobo that I used to build a friend a system proved to be finicky when trying different FSB speeds. I did finally get him running on a 133MHZ FSB and at 1466MHZ, but not without some fuss.
First, I'd flash to the latest bios offered by MSI, the stock bios is flaky and problematic.
Next, temporarliy remove your NIC card, just until you get where you want to go. NIC cards are notorious for messing up FSB overclocking.
Then, you might as well unlock your chip, as you will find the best performance with an FSB of 133MHZ or higher.
Note: While I did get him running at 133MHZ FSB, no variance was possible, not even 134MHZ, so this will take some playing around, but it is worth it.
Good Luck!
OCnMan
P.S. Try this, you never know: Since you are having something holding back your FSB speed, crank your voltage right up to 1.85, and set your FSB to 133MHZ. This way, all periferals will be at stock speeds due to the higher divisor used at 133MHZ FSB, though at first you may want to remove the PC-100 RAM. Your PC-100 may do the deed, but you can throw that back in later to see, you don't need it in the mix now. 9*133FSB is 1197MHZ, if your chip can handle that speed, you will avoid all of the problems with the MSI BIOS.

 

[iamthesystem]

OCnMan,

Just to understand something you seem to state in your post...the MSI BIOS will easier handle a full 133MHz bus speed than anything from 101-133???

need to fully unlock my CPU first.....voltage and multiplier...must...go...to....radio shack...!!!



does anybody else have an idea why i can't push my fsb to anything over 105?


thanks again...

 

[iamthesystem]

no further suggestions???