Now you have reached
the point where things can really go wrong. Up until here
any mistakes wouldn’t be fatal in most cases but if you do
something wrong from this point and on, expect to have a
dead graphics card, and possibly also a dead mainboard and
power supply in the process :).
Only perform these
modifications when you fully understand the formula for
calculating the resistance of your card. Unless otherwise
stated, all measurements should be done when the card is
installed in the PC and PC turned on and running.
I will make a small
note here, I read on a forum that by raising the voltage
sent to the card through the Molex connector a pretty good
increase in overclock could be attained.
However I do not have a power supply that lets me change my
5v line, and neither like this guy had a small power supply
for only the graphics card. Apparently the card only draws
power from the 5v line. I see three possible ways of
performing this mod:
·The easiest way is if your
power supply has potentiometers that allow for this, open it
up and have a look. Remember to NOT ground yourself though
and work with only one hand because the voltages can kill
you!
·Another method would be to
fool the 5v sense signal on your ATX cable,
here is a link on how to do exactly that, this will
allow you to increase the voltage via a potentiometer on the
rail of your choice (3.3v, 5v or 12v)
·The last method would be to
simply use another power supply that has the ability to
adjust the 5v rail, perhaps a small 5v PSU for just the
graphics card?
There are currently 4
known voltage mods that can be done on the Radeon board, one
is the so-called “VREF” (Reference Voltage) mod, and this
mod is only for people with 9700 non-pro boards. These
boards have had their VREF lowered compared to the “pro”
boards so increasing it on those can help. See info at the
last pictures in this guide.
The other is the
“VDDQ” mod (internal chipset voltage for the processor.)
However increasing its voltage only made things worse,
decreasing that voltage however might help but I have not
tried it, details for this will be provided in the pictures
at the end of the guide.
