Max safe voltage, PCI clock

[kallenin]

Hey,

I've been trying to overclock my Socket 423 system: a 1.5 GHz CPU on an Abit TH7-RAID Mobo with 512 MB of PC800 RAM. Since the CPU is 100x15, I'm ambitiously hoping to clock up to 133x15 (~2.0 GHz). So far I've been able to get the Mobo up to 115/36 (FSB/PCI), but it doesn't seem to like anything faster than that. At 115, PCMark ran well, but 3dMark 2003 crashed at some point - possibly unhappy AGP port? Anyway, I was thinking maybe if I raise the voltage I could up the clock a bit more. The default voltage is 1.7 and I can adjust it in 0.025 V increments. By how much voltage can I "safely" (more like "reasonably") increase the voltage without risking serious damage to the CPU (I'm cooling the computer with a big fan pointing at the open case: my HW pmonitor has read no therm problems yet)?

-Kallenin

P.S. The next FSB/PCI i've been trying to clock to is 120/30, which uses a different FSB/PCI ratio - maybe that has something to do with why I can't clock up that high?

 

[pIII_Man]

try bumping up the voltage to 1.75...

What graphics card are you using?

Also it may be your memory at fault...use the pc600 memory setting to see if that clears things up...


Proud owner of DOS 3.3

 

[kallenin]

My vid card is an ATI AIW Radeon 9800 Pro. I upgraded my sound card, vid card, and monitor recently - I'm waiting for the P5 to upgrade the rest, but that may take some time.

-Kallenin

 

[pIII_Man]

well...i know for a fact that the r300 cards do not take agp bus overclocking very well...my card cant take much over 70mhz...

But first focus on the mem and cpu...

try setting the mem to pc600

and/or try increasing the cpu voltage (crashman covered this in your other forum)

Now i am not sure what your agp divider is...but it may be helpful to SLIGHTLY increase your agp signaling voltage to see if that helps at all


Proud owner of DOS 3.3

 

[Crashman]

Your i850 chipset is that same as the i850E, it supports lower multiplier for use with 133MHz FSB. I believe your board also supports "locked" PCI and AGP speeds. If Fugger is still around, he can tell you more.\

You might have problems with speeds between 115 and 133 if your board only offers PCI ratios of 1/3 and 1/4. Shooting straight up to 133 will probably allow 133/33.

<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>

 

[kallenin]

Actually I did try that, thinking about the PCI bus being unhappy. I just get nothing. 🙁 I don't know if POST codes are standardized, but mine was giving "AE", which isn't listed in the manual. I'm guessing it was some sort of locking feature... unless maybe you know what it is and how I can get around it?

-Kallenin

 

[kallenin]

I've been using PC600 as the mem setting (i.e. 3/1) since I wanted my mem tooperate normally at PC800 *after* the overclock. I can't change the AGP voltage from the BIOS - i don't suppose there's another way to do that kind of thing? 😵

-Kallenin