[8K9A] Vcore mod is here!!!

[Fewture]

I searched my @ss of finding this mod.. No one had done it. For some reason I don't understand this board only allows 1,95V on the core. Even if you set 2,00V in the BIOS it still gives 1,95V. Now I bought an Epox for the Vcore and the thing gives 1,95V only So now I still had to do a vmod

Epox: Why is this board stuck on 1,95V?? The 8K9A2+ has 2,2V. Any reason for this?

Twice I almost killed the board, but I can tell you it's working now!!!

I soldered a 250K pot between Pin 3 and Pin 17 and the vcore goes up when I turn it halfway. I've had 2,2V whit no problems.

When you do this mod be VERY casrefull with the pot. 250K is too big!!! It wil FLY up! So turn VERY slowly. Touching te pot almost makes it go up. 100K would be more safe for turning. I will take the 250K off and measure it so I can put a smaller one on.

Happy moddin'!!

Edit:
The chip's code is: "IRU3055" located between the PS/2 ports and the socket (no pics, sorry).

[Mickey Padge]

The 8K9A2+ only goes up to 2v . Which reads 1.98v on my board

[Fewture]

Originally posted by Mickey Padge
The 8K9A2+ only goes up to 2v . Which reads 1.98v on my board

Ah..I thought it went higher.. Wel, now you know what to do about it :-D

[Mickey Padge]

I have done volt mods before , but never without pictures and a complete guide etc...

[newhit]

Fewture, are u pumping up a Tbred A or B because i would be loathe to do the mod on my Tbred B 2400 because, from the forums, i'm led to believe Tbred B's don't like more than 2.0v. Hope i'm wrong of course. By the way are you sure of your resistor (pot) value? It seems a bit high.

[Random Nonsense]

newhit, a pt is basically a variable resister, 250Kohm is its maximum resistance I assume.

[newhit]

I know that. But his overall value is 250k. If he was to use a lesser value then the sudden increase over the whole range will be reduced. I was wondering if the OVERALL value was too big.

[Fewture]

Ok, update:

Ik took the 250K VR off and measured the resistance. It was only 1K Ohm!. So a 250K VR is serious overkill, but you must understand I used a VR that big for testing. A VR too small would have killed my chip
So 5K should do..maybe 10K to be really safe.

Don't forget: 1K gives 2,2V when BIOS is @ 2,00V!!

I use this with a Tbred A week 35 (2154Mhz max). Tbred A or Tbred B, be carefull over 2V. YES, they do die from 2,2V. I have seen 2 Tbred A's both on water. 1 dead, 1 crippled. I use 2,05V and 2,2 for benching. All this @ 33C to 39C. Make sure temps are low.

http://www.fewture.cistron.nl/img/8K9Avmod.JPG

[Holst]

I think you answered your own question.

More than 2v means your an extreme overclocker, and a Vmodd should be second nature.

if your not willing to kill your CPU or mobo overclocking then you dont need more than 2v do you.....

[Fewture]

Originally posted by Holst
I think you answered your own question.

More than 2v means your an extreme overclocker, and a Vmodd should be second nature.

if your not willing to kill your CPU or mobo overclocking then you dont need more than 2v do you.....

Jep, if you don't want a risc..don't go there..

[Daniel ~]

Still nice work! I'd add it to our FAQ... but as Holst mentioned most want to survive their mods until the new EPoX is out ":O}

[Fewture]

Originally posted by Daniel ~
Still nice work! I'd add it to our FAQ... but as Holst mentioned most want to survive their mods until the new EPoX is out ":O}

Tnx! :-D Nice to be of some help

[Daniel ~]

When folks come offering new solutions...Hey, we don't get to mad about that! ":O}

[Fewture]

Originally posted by Daniel ~
When folks come offering new solutions...Hey, we don't get to mad about that! ":O}

The 1K resistor mod has been done and confirmed. The guy got 2,0V @ 1,85 in bios. Close enough to 2,2V I think.. A VR is still better I think. More freedom.

[Jeff F.]

Another happy customer here. I soldered ~1120Ohms across pins 3 and 17 for exactly a 0.1v gain.

Thanks again Fewture!!!