Passing "the wall"

[Highlander]

Have seen many users hitting a clockspeed wall with their Dothan Sonoma's, kinda like the FSB wall with the 400 fsb chips.
This one doesnt like anything over 2.572 ghz. Anything higher and it'll reboot or hang. Passes pi 32m @ 2.572 with 1.375v, but even with 1.5+v it wont budge. Has anyone found a way to squeeze more from these chips once they hit this wall? Or is that it? No more...?

Cheers :D

[{PMS}fishy]

First thing I would do is freeze it. That will tell you if you have a wall or not.

Chips might not like voltage, but they love to get cold.

Seems ~2.8 is where most of the older chips hang up.

Also, all of the 400bus CPUs crap out at 165. Almost as if it was a designed limitation.

[Highlander]

Ok, freezing might well be a problem, would a larger cpu and 180cfm of cold air help do you think? Or is getting this chip really cold the only option?

[{PMS}fishy]

No idea if better air cooling will help. Freezing a chip will tell you if you have a wall or not. I have seen some winnys that run the same speed on air that they do on phase. Now thats a wall.

[Highlander]

Ok thanks m8 :)
Will add that to the list of things to do when I get a job lol!
Mighty impressive chip, even at 2.57ghz 28.1secs pi, 40mb/60secs winrar compression, 27.3k 01/9800pro... Dothan power!

[walaka7]

Im kinda with fishy on this one. Except it appears that the 400's like up to around 1.5-1.55 volts on air. And most will crap out at 165. ive run 170 on mine but after having issues that im not sure are resolved yet, im running 165. Once at around 1.5 volts, then its time to lower temps. I can tell you for sure mine will go more with cold, and from what ive seen others are getting great results going cold too. The dothan deffinatly acts differently than other cores in terms of stability, voltage, and temps. It can appear stable and with a change of a couple of degrees or a small flux in voltage, force a reboot or freeze.

[Highlander]

A little burn in has helped, will pass superpi 1m @ 2.6ghz now :D

[datura3]

Mine hit a wall even with a pelt. The proc at 2C gave me about 3mhz on the fsb compared to the proc at 32C on water. I never tested it on air.

[walaka7]

Yeah but the general consensus is yours is a lemon of sorts. Wait till you get your next one :) then we'll see ya hit 2.85 on water and 3+ on pelt :beer:

[Highlander]

Mine hit a wall even with a pelt. The proc at 2C gave me about 3mhz on the fsb compared to the proc at 32C on water. I never tested it on air.

Ouch, thats a very poor chip :( Still not a bad OC though ~900mhz was it?