Dothan overclocking thread

[Spajky]

@ Frozendeath :
@ charlie :
& @ others too ...

The problems with initial lower Fsb boot (no mater the Vcore set) but if clock is rised in Windows later goes higher is in fact Bios/design problem according to Intel´s datasheet !!!

Yes, in electrical specification there states for Vcore: Vcc,BOOT .. 1,2V (-/+ 5% margin)!!!
This voltage is controlled by 2 output control pins on the Cpu (VssSense+VccSense) that tell MoBo that all is Ok before attempting other Post procedure, no matter what actual Vcore is set-that looks like kicks_in determined by MoBo/Bios later when POST is finished! So that Vcc,BOOT too low Vcore at begining is the problem. Same is why MoBo has to be flashed before mounting P-M Cpu on it to recognize that states (if not flashed looks likes no boot at all except on ECS-P4IBASD (i845D) MoBo).

Yes guys, I´ve done today my "homework" by deeply studying datasheets whole day [http://developer.intel.com/design/litcentr/index.htm] & I am prepairing a post with more possible enhancements & troubleshooting ideas to better OC {"Me brainstorming, You make modds!" ... way, like I did it on times of Tualatin_on_BX mod breakthru on MadOnion/Futuremark thead more than 3y ago) also for some other sites forum Celeron-M thread guys ...

So how to circumvent that boot 1,2Vcore problem? Hardware way Fixing Vcore on the MoBo & maybe some of those other 2 mentioned pins (or both) "fixing" by adding some pull_up/down resistor for forced termination or isolating them (modding the adapter or MoBo further-need of also P4 datasheet for last!) That way IMHO could the MoBo or adapter be tricked to supply @ boot higher Vcore immediatelly resolving that lower Fsb problem on boot!

The other solution IMHO could be by isolating in socket the E4 pin (PwrGood) & connect it via "wire trick" to a non isolated first (not so) close VccP pin, to trick the CPU & MoBo that all is Ok, so that MoBo supplies full Vcore@boot to a CPU & boots anyway. Same way we did it for Tuallies on slotkets time ago to enable booting ...

I also checked fotos of that Asus CT-479 I got from different sources: There on it are 2 linear voltage regulators: bigger one for VccP (1,05V -/+5%) for signal i/o Cpu stages & smaller one for i/o chipset GTLREF-erence (0,63V -/+1%) = electricity source for that is from that additional "floppy" power conn. like for other electronics there on it, while Vcore source is from MoBo P4 socket ...

And you know what that means? It means that Intel reverted back to 8y ago (to P-1 family way) for supplying Cpu with 2 main voltages-differential supplying (like last ex.P233mmx & before) again !!! One for strictly main core & one for cores i/o signal stages! Thats way you need that Asus adapter (also because too may pins are differently placed on P4 & P-M Cpu, especially a bunch of Vss and Vcc pins interchanged). P4 & other last 8y Intel CPUs have single power supplying (like AMD too, starting with classic Athlon till now) ...

Did I make my homework or didn´t I ?
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Regards, http://www.spajky.vze.com