High Vcore freezing issues, any advice?

[felinusz]

I've been playing with my Mobile Barton 2500+, doing some preliminary pushing, and have experienced some odd issues.

It looks like my chip is 'Vcore sensitive', as Windows will freeze, or restart with high Vcore voltages (above 2V). Doing a burn-in at 600 MHz, with 2.1V of Vcore caused windows to restart. Trying to boot at any speed, with any Vcore above 2V will cause freezing, or restarting during boot up.

Has anyone else experienced this with a mobile Barton, and were you able to fix it?

A L12 pin mod fixed a similar problem with a Thoroughbred 1800+ of mine, but I am reluctant to remove my Waterblock to get at the chip, and L12 mod it, if there is an easier soloution.

I am using an NF7-S, I have RAMsinked Mosfet cooling with a 120mm AOC fan blowing over them, and my Voltages are all stable, without fluctuation. my Vcore undervolts more and more as the BIOS Vcore is raised, but this occured with all my other chips as well, and I don't think it is related.

I really appreciate any advice, and any suggestions :)

[Sentential]

Its one of two things bro.

#1 Its the "siren issue", which I have the solution for. It is stickied here: http://www.ocforums.com/showthread.php?s=&threadid=278581

#2 "Voltage Burn" as I like to call it. If that ^^ dosnt fix the problem it sounds like you have weak silicon that cant handle high voltage.

I hope my mod fixes ur porblem. It helped enough pplz to get stickied

[greenman100]

What's your PSU, and voltages?

[ChillPhatCat]

As I posted in the other thread... yes they seem to be sensitive to voltages. At voltages above 1.8-1.85 it seems these chips start to crave better cooling... I found that my chip will restart in the mid 30's in temp at voltages 2.0+ After much tweaking I arrived at my current speed at 1.95V (bios) and it primes indefinitely at under 40C.

When I did open the windows up and drop the room temp to about 10C, I was able to run at 2.2V when temps were under 25C... I came inches away from a 2.8GHz screen shot... but it crashed as I opened up MS paint.

[greenman100]

If your PSU is stable, then maybe your CPU doesn't like high voltages. Mine doesn't.

[JerMe]

I'm still having temp/thermistor issues, but felinusz, maybe a different BIOS would help. My board hates tictac's 22s, ever since I flashed to his BIOS, I can't get past 2V without that damn siren going off and windows freezing. :rolleyes: I'll have to flash back to the official D21s in a bit.

[ogboot]

i've wondered if i could get a better overclock on an Nforce2 mobo. pci/agp lock isn't an issue with me, my drives ran at 38mhz long time without corruption, but i have seen people change mobos and get better overclocks with their cpus. course, i won't be buying another 32bit board anyway so this is a moot point :)

[felinusz]

posted by Sentential

Its one of two things bro.

#1 Its the "siren issue", which I have the solution for. It is stickied here: http://www.ocforums.com/showthread....threadid=278581

#2 "Voltage Burn" as I like to call it. If that ^^ dosnt fix the problem it sounds like you have weak silicon that cant handle high voltage.

I hope my mod fixes ur porblem. It helped enough pplz to get stickied

Thanks man :). I definetely intend to bend the diode up some more when I L12 mod this chip tommorrow. My diode has already been bent up a little bit in an attempt to get more accurate temperature readouts, but not enough I think :). I have never experienced the two-tone siren untill now, which I also find odd. None of my other chips ever experienced it.

I have had a voltage sensitive, or voltage burned chip before, and the L12 mod helped. I'm hoping a combination of your diode modification, and an L12 mod will help set things straight.

posted by geenman100

What's your PSU, and voltages?

I have an Antec TruePower 550W, and my rails are solid. The rail lows (they never fluctuate below these values) are; 3.3V at 3.28V, 12V at 11.98V, and 5V at 5V.

posted by JerMe

I'm still having temp/thermistor issues, but felinusz, maybe a different BIOS would help. My board hates tictac's 22s, ever since I flashed to his BIOS, I can't get past 2V without that damn siren going off and windows freezing. I'll have to flash back to the official D21s in a bit.

I'll try out modded D10, tictac's D22s, and the 'official' revisions. Right now I'm on official revision 18 - I hadn't thought of trying a new BIOS, and it's definetely worth a shot.

Thanks for the help, I'll be sure to let you know how it works out.