How to do 8KHA+ vcore mod this way?

[gared]

Please check this link: http://www.vr-zone.com/guides/3DMark2001/

Apparently, his mod enables his 8KHA+ and AXP to run at 2.13V. How lucky, my pin2 and pin11 mod can only go as high as 2.03V. Anything above that will restart my machine.

[EPoX Tech]

I've just read through all of that. That truly is what to do with a mainboard to make it do the most. That is true overclocking.

Many congratulations to Macci on the fruits of his hard work.

[Paul.K]

Gared,

Could you please give me some information concerning the Vcore mod the bypasses the Voltage protection circuit.


Thanks Paul.K

[gared]

Originally posted by Paul.K
Could you please give me some information concerning the Vcore mod the bypasses the Voltage protection circuit.

Paul, that's exactly what I am trying to find out. I haven't seen that information yet. Hopefully macci will share his trick in some forum.

[Paul.K]

Just e-mailed Macci for info!!!!!!

[Road_Runner]

Originally posted by Paul.K
Just e-mailed Macci for info!!!!!!

Paul...

Let me know if he responds. I emailed him 3-4 days ago after I read his mod article and he never responded. I've talked to hm before about a few things, mostly GeForce3 vmod related stuff, but I've since emailed him a number of times and he hasn't responded. maybe I peed in his Wheaties and don't know it.

[Paul.K]

I'll keep you posted mate!!!!!


Paul.K

P.S Got am e-mail from the publisher/adminstrator of VR-Zone and asked him to contact Macci on my behalf!!!!!

[Road_Runner]

Originally posted by Paul.K
I'll keep you posted mate!!!!!


Paul.K

P.S Got am e-mail from the publisher/adminstrator of VR-Zone and asked him to contact Macci on my behalf!!!!!

thanks Paul...

According to fedex, my Abit KR7A should be here any time now. I've got instructions printed and ready to go for vcore, vmem, and vio mods. Hopefully, after work, I'll be running in the Abit camp.

Interestingly enough, the 8KHA+ reviewer in the link below had some all too familiar sounding problems.

http://www.pcstats.com/articleview.cfm?articleID=887

[macci]

Hello!

This is how I modded my 8kha+:

1st step:
take a look at this datasheet:
http://www.onsemi.com/pub/Collateral/CS5301-D.PDF

Note "Hiccup Mode Current Limit" under Features list..
This means that the CS5301 chip controlling the CPU Vcore has overCURRENT(not voltage) protection feature. And the more you overclock the CPU and up the Vcore the more current will be drawn from the PSU. The defaul current limit is reached at around 1,8-1,9GHz (at Vcore of 1,98-2,1V). This is where the "Hiccup Mode" kicks in.

So in order to increase the Vcore past ~2V at ~1,8-1,9GHz CPU speed one has to set the Current Limit to a higher level.

Take a look at page 9 (pin descriptions) of that datasheet.
We already know that pin 2 can be used to raise the Vcore above 1,85V. Soldering a 100kohm resistor from pin 2 to GND increases my Vcore up to 2,26V. However some people are reporting that 100k resistor increases the Vcore all the way up to 2,4V!! So I suggest you start w/ higher resistance like 200kohm.

Pins 4, 5 and 6 are current sense inputs. Pin 7 is reference for current sense amplifiers. These pins are there to set the Current Limit and this limit can be set to a higher level by grounding each pin w/ a resistor. I've used 80kohm resistor for pins 4, 5 and 6 and 50k pot for pin 7. Using lower resistance would increase the current limit even higher. Note that resistance between pin 7 and GND should be 1/3 of the resistance between sense pins (4,5,6) and GND. So set the pin7 pot/resistor to around 30kohms.

[Note: the resistor values may slightly differ from mobo to mobo and from revision to revision, so I suggest you measure the original resistance between sense pins (4,5,6) before modding. It should be around 20kohms for sense pins and 6,66kohms for ref. pin.]

Good luck and don't kill your mobos and CPUs
And if u happen to kill em DON't BLAME me !

EPoX Tech,
Thank you for you kind words This board is really an outstanding performer at high FSB speeds!

-macci

[proze]

that is an AWESOME overclock, macci!! well done, mate!!

[Paul.K]

Thanks Macci I'll try this ok!!!!


Paul.K


So here's a summary,


place 80Kohm resistors on pin 4,5,6
place 5okohm pot on pin 7

and on pin2 place 200/220kohm resistor.

GND all!!!