Watch out! Different cores of Celeron c-128 and P3 c-256.

[weibow]

Hi. I don't if this is a news or not but I still want to post here. There are two different cores of Celeron C-128.

0x683: 533A-700 v:1.5~1.65 Back of the chip: only two resistors with no other contact plate. The size of the die is bigger.

0x686: 533A-700 v:1.7 Back of the chip: Just look like a P3 but some open connector( fewer resister than P3). The size of the die is smaller. CHECK the datasheet on Intel's web.

Overclocking: 0x686 is better for overclock. I got two 0x686 600s and they will work beautifully @ 945 with default 1.7V. And one is now working @ 990 with 1.9V. I also got a retail boxed 0x683 600 which refused to work at 900 with even 1.8V (default 1.5V) . FYI, from Intel, the MAX V for FC-PGA is 2.1V.

Also from Intel's datasheet. 1.13G and 1.0G P3s used only 0x686 and with 1.8V and 1.7V. That means 0x686 is the newest core design and was designed to reach 900 to 1G+ range with only 1.7V. So, my conclusion is, go for a 0x686 chip for overclocking.

 

[RoadRuner]

of course.

the 1.7V are the cb0's,

the cc0's are out now!

onvia.com 633 is a cb0 (0x686) or whatever you call it. they all work great at 950.

 

[AndyHui]

CPUID 686 is the cC0 stepping. Nice to see they are now on the market.

 

[Eug]

Roadrunner, he's right. The cC0's are the 1.7 V chips. It's interesting to note however, that Intel's last recalled chip was a cC0.

As for the 533As, I don't know if there is such a thing as a cC0 533A, because they stopped releasing them here just as the cC0 chips were appearing. The spec sheets include a cC0 533A, but other info from Intel doesn't seem to acknowledge its existence. Not a biggie though, since my cB0 533A does 920 1.9 forever and 960 1.9 V for over a day at full load. (I can't test anything in between because of my limited FSB settings.)

 

[AdamK47]

It looks like the cC0 is only a tiny bit better than the cB0 when it comes to overclocking... well, for the most part. Perhaps some cC0s can overclock to 1.1GHz and run reliably (Unlike the recalled 1.13GHz CPU). I'm still happy with my lucky cB0 chip though.