Aopen i975Xa-YDG Mod

[runmc]

Thats odd going from 100K to 50K yeilded no difference in vcore, did you check against all the suspected read points?

I checked in the bios, cpuz and I used my volt meter on the known read point. I must be doing something dumb here. Is this similar to the Dothan where we had to do a socket "Pin Mod" to increase the voltage?

[Hell-Fire]

ATM, I dont have time to read over the entire thread. Here are a few quick thoughts, and keep in mind that I don't have time to read the whole thread right now - so no flaming if I am about to ask questions that have been answered already.

What is the Vcore regulator chip? Looks like an Interisil chip..?? Once we get a look at that, it may be that the limiting factor here is that the output pins for Vcore have a max possible output regardless of resistance.

I have a few ideas, but I need to know what the regulator is before progressing.

[mike]

I set the resistors at 100kohms and 50kohms. Actually I used a fan socket so I can take the resistor out and change it.

tried 20k and lower still same vcore... either we both screwd up here ( according to STeven he does not have the prob.) or this is a wrong spot of a vocre mod

[zbogorgon]

A little help yet again. Kyosen's vcca mod, you need to increase R151 resistance by soldering another VR by. But how and where, without removing the R151.
If i solder on top of R151, that would lower resistance. Kyosen't pic isn't clear enough to see where exactly he solder.
Has anybody have a pic of their own mod?

[snatchmonkey]

Have the vcca and chipset mods yielded an improvement for anyone?

My yonah seems to max out at 270fsb, I find that increasing the chipset voltage in bios DECREASES stability and causes lockups around 240 between 240 - 246 fsb. I suspect that the PCI-E voltage is connected to the NB voltage as I actually find the AUTO setting to be the most stable just as long as the PCI-E voltage is put up a bit (1.55v+). If the PCI-E is set to max then anything above AUTO on the NB causes instability. Had some success with different variations but all in all it seems to me that the bios provides more than enough vchip options. I read somewhere that kyosen also has removed the NB mod from his board due to the lack of gain.

I'm too chicken to try above 1.64v vcore... looks like 270fsb yonahs are few and far between.

I'll be trying the VCCA mod soon though as I think it may help, also interested in the kyosen tcore mod - but will it let me get into the bios with my single stage???

[runmc]

also interested in the kyosen tcore mod - but will it let me get into the bios with my single stage???

I couldn't get into the bios @ sub zero cooling until I did the mod. Now it's no problem.

[Gautam]

My yonah seems to max out at 270fsb, I find that increasing the chipset voltage in bios DECREASES stability and causes lockups around 240 between 240 - 246 fsb. I suspect that the PCI-E voltage is connected to the NB voltage as I actually find the AUTO setting to be the most stable just as long as the PCI-E voltage is put up a bit (1.55v+). If the PCI-E is set to max then anything above AUTO on the NB causes instability. Had some success with different variations but all in all it seems to me that the bios provides more than enough vchip options. I read somewhere that kyosen also has removed the NB mod from his board due to the lack of gain.

I'm too chicken to try above 1.64v vcore... looks like 270fsb yonahs are few and far between.

I'll be trying the VCCA mod soon though as I think it may help, also interested in the kyosen tcore mod - but will it let me get into the bios with my single stage???

Thanks. That sounds very interesting...IMHO the northbridge is in one way or another part of the wall. Don't know how, but I think its more than just the procs. Especially after hearing this...that's one mod I'll skip for sure now.

Has s7e9h3n's alternate TCore mod worked for anyone? If its altering temps in the BIOS, it sounds like it should.

[s7e9h3n]

Has s7e9h3n's alternate TCore mod worked for anyone? If its altering temps in the BIOS, it sounds like it should.

I've still got no access to bios. It may require a different resistance or I may be running too cold for the mod to offset the temps....

[snatchmonkey]

I'm using s7e9h3n's Tcore mod and same, can't access the bios. It seems to only adjust the temps so far... not enough. I think it has helped a bit though.

Was hoping to get away without cutting any traces.

[Gautam]

Was hoping to get away without cutting any traces.

:-/ So was I.

Edit: anyone got a good shot of how the cut trace looks like when done right? Cutting traces is easy, it seems like not cutting too far is the challenge. :p

[zbogorgon]

can anybody tell me if this two point on normal board are connected?
marked red

[snatchmonkey]

:-/ So was I.

Edit: anyone got a good shot of how the cut trace looks like when done right? Cutting traces is easy, it seems like not cutting too far is the challenge. :p

I was looking for one earlier also, no luck. it's quite a small trace and it needs to be cut between the ic and the little circular 'dimple' just above r572 and r570. I did the mod earlier and can report that it works flawlessly. Not sure how everyone else does it, but when cutting traces i tend to make two parallel cuts and then scrape away the copper in between. With only one cut I find myself having to press harder etc. which makes me nervous

VCCA mod bought me 5Mhz @ 2.3v btw... which is fine on a 12x multiplier but useless to me on 13x as I just cant seem to get past 3.51Ghz

[zbogorgon]

cmon sb, are those two connected. I did Tcore mod, but resistance of my connceted VR is not 12.1k (set to 17.5k before connection) but 7.5k. Is that right or did i do sth wong.

[s7e9h3n]

cmon sb, are those two connected. I did Tcore mod, but resistance of my connceted VR is not 12.1k (set to 17.5k before connection) but 7.5k. Is that right or did i do sth wong.

Use your meter to check if they're connected. I don't have the board next to me ATM, but your meter should have a function to check continuity. Use that and you should be able to tell.. Sorry I couldn't be of more help right now....,

[Gautam]

BIOS 1.03C apparantly makes the TCore mod unnecessary.

[s7e9h3n]

BIOS 1.03C apparantly makes the TCore mod unnecessary.

Really? That's great news Linky?

[zbogorgon]

yes i have them connected, but i have a problem. I did the mod and aparently i did sth wrong. When I turn on mobo, i got 125° in bios and i can't get in windows, just like with sub 0 cooling before mod. If i turn the trimmer nothing changes.
So if those two points are not connected in normal mobo, that is the problem, but i looked and it doesn't seem that i connected them, but just to be sure. I really don't know what is the problem. I checked the mod hundered times and it looks like everything is just as it should be according Kyosen's guide.

[Gautam]

Really? That's great news Linky?

http://www.xtremesystems.org/forums/...&postcount=240

[kiwi]

Here is the link to 1.03c (posted by VictorWang) which solves 'getting in bios when subzero' problem

http://vic.expreview.com/attachment/ica13c.rar

tried 20k and lower still same vcore... either we both screwd up here ( according to STeven he does not have the prob.) or this is a wrong spot of a vocre mod

As far as I know you can't get higher vcore no matter which VR since max. V is controlled by that chip on mb. Yes, if you find another spot, you might get higher vcore.

[s7e9h3n]

yes i have them connected, but i have a problem. I did the mod and aparently i did sth wrong. When I turn on mobo, i got 125° in bios and i can't get in windows, just like with sub 0 cooling before mod. If i turn the trimmer nothing changes.
So if those two points are not connected in normal mobo, that is the problem, but i looked and it doesn't seem that i connected them, but just to be sure. I really don't know what is the problem. I checked the mod hundered times and it looks like everything is just as it should be according Kyosen's guide.

The mod is NOT working then. If it reads 125C in bios and you CAN'T get into windows, you did something wrong. I had that problem and then I noticed one of the legs on my solder points had come loose....

[Thomas Olivaux]

Stupid question... do this Vcore mod exist to increase the max CPU voltage or just to have a more pricise voltage, closer to what the BIOS propose?

In my case, I've just mesured 1.312v with kiwi mesure points, Bios set to 1.325v.

++

Thomas

[kiwi]

Who succesfully did vcca mod?

I did vcca mod but I can only decrease voltage from 1.5V to lower lol
What did I do wrong?
Mod taken from this pic:
http://www.xtremesystems.org/forums/...4&postcount=54

Without VR I am getting 20ohms, but with a 100ohm VR I can only decrease resistance to around 16ohms or less thus voltage only lower.



Thomas Olivaux:
Vcore mod is only to increase voltage above 1.5V

[zbogorgon]

you solder VR wrong, it should be soldered the way you increase resistance not decrease. You soldered on existing resistor and that way you decrease it's resistance.
The only pretty way to do that mod is unsolder existing resistor and solder on 200ohm. I have thinked about it and the only other option is to cut a trace somewhere.

[kiwi]

So R151 must be removed completely? And replaced by 200ohm VR? The picture has red cross on R151, so it obviously means desolder resistor, right?


What about other options leaving R151 at place?

[zbogorgon]

Kyosen said in a topic of Tyrou, that he changed this mod, to removing R151 and replacing it with 200O VR.
I really don't know where he soldered or how on that pic, i assume that he had to cut a trace somewhere, you should ask hiim that.
I will do that mod by removing R151, cause i think that is the easyest and cleanest way.