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It's very easy to increase the Vcore of EPOX 8KTA3+
and NMC (ENMIC) 8TTX+ by soldering just one
resistor to the right point to allow your CPU much higher frequency.
Of course it's necessary to be very careful if you're soldering something
on your mainboard in order not to kill
your board.
And of course your warranty void if you solder anything on your mainboard
!
Therefore i recommend a good grounding and a soldering station with
seperate grounding !
Before you begin to modify the Vcore you should
lower the momentary Vcore
at least about 0.2 Volt !!!
If there's a HIP 6301 instead of CS 5303
on your mainboard, please use the Epox
8KTA3 guide !!!
The CS 5303 is the voltage regulator of
these boards (three phase Buck controller).
This voltage regulator have a pin (FB/pin 2) for the voltage correction
to allow manufacturers an optimal adaption
of the Vcore and we can also use this pin to increase the vcore to "our
correct Vcore" :-)
In my test i used a normal 1/4 Watt resistor with 2,5
KOhm (red, green, red or 252 on SMD resistor).
(lower resistance value get higher Vcore)
On this picture you can easy detect the positions of the two soldering
points:
In the enlargement on the top right i marked the two easiest points
with red circles.
I didn't solder the resistor directly to the board in order to modify
the resistance value once again.
Just solder the resistor to a cable and then solder this cable to the
marked pins.
After this modification you should check the correct position !!!
Now put adhesive tape or a small piece of heat shrink sleeve over the
resistor that it's impossible to get
a connection with other components.
After this small modification your Vcore should be 0,23
Volt higher than the selection in your bios.
So if you select a Vcore of 1,5 V the real ! Vcore is 1,73 Volt and
with a selection of 1,75 V you'll get 1,98 Volt.
You get the highest Vcore of 2,08 Volt
if you set the voltage in your BIOS to 1,85 Volt.
Here's the PC-Health menu display at 1,85 Volt:
And if that's still not enough for your CPU you could solder a smaller
resistance value but the risk
to destroy the processor is very high.
If you want to use a variable resistor you should solder a 1,5 - 2 K "protection"
resistor in a line !
Pay attention to the CPU temperature after increasing
the Vcore !!!
All pictures copyright 2001 of www.ocinside.de
!
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