random oclock, please help

[toutin]

I've a duron 700 and the only 100% success rate oclock I reach is 850Mhz(8.5*100 @1.75V selected, 1.82V reported in VIA monitor [ i don't touch the FSB because my chipset is a KT133] ) .
900 Mhz happen to work (at 1.775/1.85 reported) sometimes and I'm really wondering why not all the time. I have a PAL6035 and my temps shouldn't be the problem. I've tried with vcore to max 1.85 which is displayed 1.92V by the VIA monitor (about this, wich voltage is real? bios selected/reported or VIA monitor reported?) but it didn't allow me for an "all the time" 900mhz. It's disapointing because when it reaches to 900, it is 100% stable at a reasonable voltage (burn in tests, sisoft, prime 95 ,etc...) but if I try to reboot, black screen or bios checksum error.
Do you know what could help me to get those extra 200mhz last (or more if you know the secret key) ? Is this possible that I can achieve 900 only at cold boot?

[Pitspawn]

Could you give us a little more info about your system?

My guess so far is that it's either temperature on the motherboard (not processor) or your psu.

Try a higher wattage psu or putting a heatsink or mini hsf combo on your motherboard northbridge.

[toutin]

Mainboard: soltek SL 75 KV2-X (basically a kt133 with the 686B southbridge)
CPU: duron 700 AKCA week 44
192 ram PC 133 (128 infineon, 64 no name).
Case: Aopen HQ 45 250 W (should be enough, I only have one CD-ROM, 1 HDD, a sb live and a geforce 2GTS, and an USB mouse with my USB modem)
I'll try some cold boots to see if it could be mobo temperature...

[-=UR=- Ranger]

I have never heard about your mobo..
It might not be the best oc mobo in the world..
Why don´t you guys stay with Abit and Asus, those boards are really worth their money

[toutin]

"Why don´t you guys stay with Abit and Asus, those boards are really worth their money "?
Money.
-->Duron + lower price (but fair) mobo = half the price of a t-bird with asus or abit... (at least when I bought them back in october...)
the remaining half surely saved for a good graphic card or hard disk or whatever you want.
You've never heard about my mobo but it's really stable, offers good performance and interesting features at 1/3 less the price of an abit (a friend of mine does have a KT7 RAID and he tried a lot of settings before reaching a stablility equal to mine! and he doesn't have crappy hardware at all) AND something you doesn't know isn't necessary bad (don't forget the price ratio). Anyway, you didn't propose any answer clue about my current problem and I 'm still wondering how a mobo could make the difference between a duron 900 (9*100) and a duron 700 oclocked @900 (9*100)? (Voltage factor taken out) I think it's about overclocking CPU wise (simply, can this cpu reach higher than 850 full time?) , but I don't think it's motherboard wise. I'll try cold boot to see whether Pitspawn was right or not.
Thank you for the feedback, still welcoming other ideas.

[jordan]

soltek has been around the block once or twice, they are similar to iwill as far as being unknow but good, why not try to up your fsb? You can probably still get an extra 10% on the fsb even with the kt133 chip

[toutin]

problem is that upping the FSB is really hard, my geforce 2 hangs quite quickly at a little 106 FSB :( . I'll try to improve my cooling and see what happens...

[toutin]

by the way which voltage monitoring is wrong? the one reported by VIA hardware monitor (typically reports 0.5V higher than the bios) or the bios?
(see upper prior post )

[el]

first thing to do is get rid of the no name stick of 64mb and see if things get better. u have the kt133 and not the kt133a is that correct? I would suggest getting a different mobo with the kt133a north bridge.

[seadog]

Yeh, the no-name ram probably isn't helping things any. Have you tried the "pencil trick" on your L7 bridges? Even if you have the Vcore raised in the bios, when the system boots, it momentarily reads the default voltage off the hard-wired L7s. Connecting the L7s like you did the L1s raises this default voltage to 1.85. I could only get my Duron 800 to 950 until I modded the L7s. Then it went to 1030.

[toutin]

Nice Hint, I'll try it!
All the L7 need to be closed too? exactly as the L1 are?
If my no name is the cause, why isn't there any problems when 900 is reached (burn in tests during, quake3 no problems)?.

[seadog]

To max out the Vcore all the L7s should be closed (I think you should only have two of them open). As far as the ram is concerned, it may or may not be causing a problem. You never know with ram compatibility :).

[toutin]

I linked my L7 and at boot I got the funny voice yelling "Please Clear Cmos settings" (my mobo have voice diagnose) I cleared it but it was still shouting that... So L7 doesn't work for me :(