A guide to voltage modifying the boards for extra overclockability.
Some people have emailed me regarding Voltage modding the MSI and Albatron
Athlon 64 boards, namely the K8T Neo and the K8X800ProII for increased overclockability
on the FSB and memory. Here’s a guide for those who might need it. Sorry, don’t
have a camera with me that will do zoom-ins clearly but here’s the illustration.
Albatron K8X800 Pro II
Albatron K8X800ProII Voltage Mod Guide
Firstly, for Vcore, locate the IC chip shown in the picture near the socket.
Its the Fairchild 5098MTC chip. Connect a 5K ohms variable resistor to pin 24,
the last pin on the chip. That is, with the motherboard standing upright, the
bottom most right pin. The other end of the VR is to be connected to a grounded
spot. Start with maximum resistance and tune downwards to increase Vcore. This
small a VR is used as the resistance on the pin is very low, less than 20 ohms.
Once you overshoot and cause the Overvoltage protection to cut in, the PC willl
shut off so you need to unplug the power cord then power the PC back on after
you have turned the VR back a little bit.
The spots to measure for the various voltages not monitored in bios is as shown,
from each of the mosfet leg. VNB refers to Northbridge voltage and VSB refers
to Southbridge voltage.
VLDT mod comes in useful when going to high FSBs such as 280+ Mhz because the
cap is 1.3v for the motherboard and there is no Hypertransport speed adjustment
available in the bios right now, which means it is locked at 800Mhz.
Locate the IC chip LM324 as shown. Connect a 50K VR from pin 4 to pin 10. Set
it out at maximum resistance first. Tune it downwards to increase LDT voltage,
but very slowly. Measure carefully and dont go too high on this as it is a dangerous
mod. I use about 1.41v, which is quite sufficient for high FSBs while on 800Mhz
Hypertransport. Be careful here.
For Memory Voltage, locate IC chip RT9202 as shown. Connect a 20K VR from pin
6 to ground. Set it to maximum resistance and slowly tune down to increase voltage.
Take note that there is virtually no cap on the VDimm here. You can go as high
as well over 4v as it is derived from the 5V line instead of the usual 3.3v
line. I have gone up to 4.5v by accident. So fine tune little by little here.
Not that the board is not good to overclock with out of the box, but with these
additional voltage mods I was able to bring it to 290 FSB 1:1 with most aggressive
timings at 3.54v of Vdimm.
MSI K8T Neo Voltage Mod Guide
For Vcore you need to connect a 20K VR to pin 10 of ISL6569 chip shown, the
other end of VR to ground of course. Set it to maximum resistance then tune
downwards to increase voltage. Once you overshoot and cause the Overvoltage
protection to cut in, the PC willl shut off so you need to unplug the power
cord then power the PC back on after you have turned the VR back a little bit.
For Vlink, which is quite necessary for high FSBs, locate the LM358 chip as
shown in the picture and connect a 20K VR to pin 2 of this chip and to ground.
Set it to maximum resistance then tune downwards to increase voltage. Fine tune
slowly while also measuring the voltage. 2.9v works great for high FSBs but
you should have proper cooling on the Northbridge and Southbridge as they will
heat up quite a bit. This mod makes a big difference in FSB overclocking for