Epox 8K9A2+ Vcore mod.

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Originally posted by RoydRage
Hi,

What I really meant was the board stable with the mod....

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Ow ghehe :D The board is fine. No problems at all. Still maxed out on 2154Mhz :mad: That was my max on the KR7A as well. I was hoping the KR7A was unstable due to fsb limitations.
I pull 14K 3DMarks with this setup. Pretty happy with that.

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Did you use a Magnifier light when you did the soldering... There are techniques that were developed dating way back to the Kt-7... For this soldering... I lot of us have gotten quite good at it.....

I have a 50k pot on had.... Did you get a chance to measure?

Thanks, Royd

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I used nothing to do the soldering. Stupid, I know. I didn't have anything. But I pulled it off :toast:

Techniques? Tell me..

I put solder on the wire and on the pin. Then I put the wire against the pin and touch it with the iron. The iron is about 310 C. It had a little knob for the temp (Weller EC2002).
How do the chips cope with the temps while soldering. Is that something to be concerned about?
I will take the pot off now and see what it measures.

Edit:

Ok, I measured it and it read really low. 1K Ohm for a max of 2,2V with bios @ 2,00V ofcourse.
I couldn't see how far the pot was because of the metal shaft. I marked it with a marker now.

So a 5K pot would do. A 1K resistor is also good.
On 2,2V it reads a little over 1K. Say 1030 Ohms.. But I recommend you use a VR, That way you're safe and you can turn the vmod off if you want.

Great work Fewture! :toast:

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Originally posted by Jeff
Great work Fewture! :toast:

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:rolleyes: :p

Tnx! :toast:

BTW, I've got a bunch of 900-2.1k resistors around here so I'll probably give it a go after getting my fill of Turkey this afternoon. :D I'll probably just put the 1k in since 2.2v is enough for me.

Again, :toast:!

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Originally posted by Fewture
14K 3DMarks with this setup. Pretty happy with that.


I used nothing to do the soldering. Stupid, I know. I didn't have anything. But I pulled it off :toast:

Techniques? Tell me..

I put solder on the wire and on the pin. Then I put the wire against the pin and touch it with the iron. The iron is about 310 C. It had a little knob for the temp (Weller EC2002).
How do the chips cope with the temps while soldering. Is that something to be concerned about?
I will take the pot off now and see what it measures.

Edit:

Ok, I measured it and it read really low. 1K Ohm for a max of 2,2V with bios @ 2,00V ofcourse.
I couldn't see how far the pot was because of the metal shaft. I marked it with a marker now.

So a 5K pot would do. A 1K resistor is also good.
On 2,2V it reads a little over 1K. Say 1030 Ohms.. But I recommend you use a VR, That way you're safe and you can turn the vmod off if you want.

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If you could do that with no magnifier you're better than me....

You did the right thing.. use a small wire, and twist it tight... Put a small bubble of solder on it. and then cut it.. So you have a small bell shaped piece of solder, and hold it to the pin, and just touch it till it melts.. Stay low near the board, and not so close to the chip.... And it should survive. <Edit... Didn't see you had C. for Iron Temps...

I like using a fixed resister, cause it can't drift, or get bumped working on the board. I also have a great assortment on hand so I could do it today... Are you sure about the value? You disconnected the pot correct?... It's just that 1k seems kinda low...

Thanks for your work! :)

Royd.... Oh.... 14k seems like a pretty could score I got 13k with this board and a faster OC then you... A stock Ti 4600 though...

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Originally posted by RoydRage
If you could do that with no magnifier you're better than me....

You did the right thing.. use a small wire, and twist it tight... Put a small bubble of solder on it. and then cut it.. So you have a small bell shaped piece of solder, and hold it to the pin, and just touch it till it melts.. Stay low near the board, and not so close to the chip.... And it should survive. I use a higher temp to melt it quick... about 620F....

I like using a fixed resister, cause it can't drift, or get bumped working on the board. I also have a great assortment on hand so I could do it today... Are you sure about the value? You disconnected the pot correct?... It's just that 1k seems kinda low...

Thanks for your work! :)

Royd.... Oh.... 14k seems like a pretty could score I got 13k with this board and a faster OC then you... A stock Ti 4600 though...

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Ok, what I did:

- Put vcore on 2,00V in bios
- Save changes
- Restart
- Enter bios
- Put on 2,2V with VR/Pot
- Shutdown
- Put mark on shaft and housing of pot in case of turning while disconnecting
- Disconnect pot
- Measure with Fluke
- 1030 Ohms
- Pot was almost turned all the way (wich is correct on a 250K pot)

http://www.fewture.cistron.nl/img/8K9Avmod.JPG
I figured maybe 10K VR is better and safer...

Any comments or tips??

Edit:

There is a typo in the image! OMG!! :D :D <--fixored..

Ok Fewture,

I going to go with a 1k resister, and give it a shot...

I was going to go higher... cause being aircooled, I can't use 2.2v...

But I'm Getting a Prommy over the Holidays!:D :D

Royd

Fewt...

Works Great... GOOD JOB!

It's very tough... The leads from the chip seen closer than I'm used to, I don't know how you did it w/o a magnifier. I almost fubared the board.

All Props Given on the Overclocking Forum.

Royd

Quote:

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Originally posted by RoydRage
Fewt...

Works Great... GOOD JOB!

It's very tough... The leads from the chip seen closer than I'm used to, I don't know how you did it w/o a magnifier. I almost fubared the board.

All Props Given on the Overclocking Forum.

Royd

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Yes, they are quite small.. My KR7A is peanuts compared to this. I have this thing with jobs that require a steady hand :D I unlocked my 1600+ w/o a magnifier. Got it working the 2nd try :banana:

I'm very happy you got it working. So 1K gives you?? 2,2V? Of a bit more maybe?

Fewture,

Yes Very Tuff... I have not taken it all the way up yet so I don't know the max... But I have 2.00v - @1.825... So it must be close... I'm Running 2484MHz 11.5 X 216... On Air. So I don't want to put the whip to it to I get a Prommy:D :D

Thanks, Royd

Damn that's a pretty hard solder job. ;)

I finally got two wires soldered to pins 3 and 17. I had about a 30-45 minute period where I had pins 1-3 soldered together. :( But after warming up my de-solderer, everything was ok. Did anybody mention these pins are way close? ;)

Now if I wouldn't have lost the 1k resistor I bought last week I'd be playing a bit tonight. ;) I guess I can wait 'til tomorrow.

Whoo-hoo!!! SUCCESS!!! :banana: :banana: :banana:

I ended up putting a couple 560 Ohm resistors together for ~1120 Ohms and with this resistance exactly 0.1v is added. I can now get at least 2.0v.

Again, great work Fewture!!! :toast:

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Originally posted by Jeff
Whoo-hoo!!! SUCCESS!!! :banana: :banana: :banana:

I ended up putting a couple 560Ohm resistors together for ~1120Ohms and with this resistance exactly 0.1v is added. I can now get at least 2.0v!!! YEAH, YEAH, YEAH!!! :D

Again, great work Fewture!!! :toast:

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Yeehaw!! :D :D

:toast:

nice thread...i'm planning to try vmodding my 8K9A, tell me exactly what i need to do, to get a max of 2.2v?
Just a 10K VR between pin 3 and 17 ?
what's better a 10K Variable Resistance or a 1K resistance?

Just another thing..it's needed a good solder iron? i have one there,a crappy solder iron 100w but i think that's too much, i'll try to get one from a friend, what happens if the solder connects other pins besides the 3 and the 17? dead board?

wEs, Please re-check.
I think that 8K9A and 8K9A2(+) don't use the same regulator.
Find the IC datasheet to locate FB pin. Then connect a (variable) resistor from FB to Ground.
To learn more go to www.oc-inside.de

huuuuumm i missed that! :rolleyes:
KS1 about oc-inside.de ..it's all in german! i like the german overclock sites, they use to have lots of pics and good modd stuff but it's very rare to find one in english!

well my mistake , ocinside is in english too :cool:

i'm not so sure if the chip is the same, i didn't check today but i was looking at the pic of Fewture that indicates what we should do to mod the board and i remembered that in my board there was not only 1 chip, but 2!

I went on epox site to find the diferences and the boards are not so similar at that zone of the board:

8K9A (mine)
http://clientes.netvisao.pt/lrevesti/8k9a.jpg

8K9A2 (yours)
http://clientes.netvisao.pt/lrevesti/8k9a2.jpg

I hope that one of those chips on 8k9a be the same on 8k9a2!

It's clear that 8K9A and A2(+) uses a different volt regulator (2 vs 3 phase). Look for the word HIPxxxx on your board. It should be the volt regulator of 8K9A. Then goto www.oc-inside.de and look for some m/b that use the same chip. Then you can begin modding.

well i found out that the 2 chips on my board as KS1 thought were HIPXXXX chips.
The chips in question are the HIP6302CB and HIP 602BCB as you guys can see on the picture.

http://clientes.netvisao.pt/lrevesti/8k9a_vchips.jpg

I'm almost 99% sure that the vcore chip is the HIP6302, i looked at oc-inside.de and find out that several boards use HIPXXXX chips, as the Soyo Dragon (KT333) and Epox 8KTA3! To vmod the soyo dragon to obtain a max of 2.04v (1.85v on the bios) have to solder a 10K Resistor between pin 7 and 9 (ground). See the pic below:

http://www.oc-inside.de/assets/mainb...n_plus_red.jpg

The main problem is that they use the HIP6301 and 8K9A uses the HIP6302 that is probably a recent version of this chip.
My question is this, as i am afraid of trying this mod like it were a HIP6301, i wanna know if with a multimeter i can measure the voltage, by trying each pin of the chip until i find the voltage that i have selected in the bios. For example:
I turn my system on at default voltage (1.65v) and when i connect pin 7 to 9 i should get the vcore voltage if this chip works like the HIP6301 right?

Ahaha i was looking for the chip specs at google when i found out that MSI KT3 ULTRA uses the same chip:

http://clientes.netvisao.pt/lrevesti/vchip.jpg

Here's the only vmod article that i found about MSI KT3:

http://www.mods4me.com/reviews.php?op=showcontent&id=16

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To modify the CPU voltage you will need to modify the HIP6302 IC chip. This chip is not very common in boards today. It is nearly identical to it's big brother the HIP6301. I won't bore you by going into the details of the differences. The specs a just like the HIP6301. It is designed for controlling voltage in 25mV steps from 1.100v to 1.850v. Designed for and capable of are of course two different things. If it was meant to do 1.85v we know we can squeeze some more out of this baby! That's what being an overclocker is all about isn't it? Get every last bit out of this chip so you can get every last bit out of your CPU..

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...you can use either an 18k resistor or a 50k pot. Although the pot allows more adjustments I prefer the more consistent voltage that you get with a resistor. EITHER works fine. For playing around and/or a temporary setup then I suggest a potentiometer. If you are looking for a more permanent setup then I would use a resistor.

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...solder a wire to one side of your resistor or pot and the other side to pin 7 of the HIP6302. That little indentation that you see indicates pin 1. Use the diagram of the chip above to help guide you to which pin needs to be connected. Then connect one end of another wire to the other end of the resistor and then the other end to a ground. I prefer using the ground on the IC chip itself which is pin 9.

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PS: HIP6302CB PDF

wEs, good. Now you can do the mod with confidence.
Please post the result (incl overcloking) when it's done.

Just saw this thread. Wonderful. I will need this when I start playing with my 8K9A2+. ;)

I love these forums!

Great work Fewture. This is exactly what I was looking for.

Damn good job.

Tnx guys ;)

Remember, my board was the 8K9A. A totally stripped 8K9A2+.

Remember, my board was the 8K9A. A totally stripped 8K9A2+.


I could have sworn you said it was the 8K9A2? There were a few posts with wEs who was dicussing the differences between his board (8K9A) with yours (8K9A2).

I just want to make sure all is well before I go and fubar my board.