Originally posted by: wetcat007
I'm looking to increase the northbridge voltage on my 8RDA+ to increate my FSB clkock, however I can not do this in the bios but I found a site with a mod to the board that looks like it should be able to increase my boards default voltage. I believe my Chipset voltage is around 1.6volts. So i was looking at going for one of the 2 resistors this website recomends which would be a 680 or 1000 ohms resistor 1000=1.778volts for a 1.6volt default northbridge and the 680 ohms would give me a 1.85 voltage. I was wondering which voltage would be better.
Here's the link to the article
http://www.8rdafaq.com/Epox_nForce2/file.php?file=vdd_mod.htm
Also does this look safe? I've done a little soldering before but not a real lot, I REALLY don't wish to damage my board but if this could help me get my FSB to 200MHz it'd be awesome...
-Mark
I've used
this page for instructions; looks similar. The trimmer resistor is really handy, as small changes in voltage can be critical. Plus, a regular resistor has like a 5% tolerance - the resistance is ± 5%, so a 1000 ohm resistor could be 950-1050 ohms. That can make a difference in stability; my one system was turning itself off while I was at work, and when I would try to turn it back on, it wouldn't do anything. This happened a few times. I had to shut down the PSU itself for a few seconds and power everything back on that way. I lowered the VDD by .03v from 1.82 to 1.79, using the trimmer resistor. No more shut downs.
Advice though: take the motherboard out of the case to work on it. I tried it both ways, on two 8RDA+'s; working out of the case was much easier. Both mods went well though. Get yourself some heat shrink tubing when you get the trimmer at Radio Shack. It can be put over the leads (sleeve it over the wires before you solder the wires) to insulate them. Heat shrink is great stuff; don't know if you've ever used it or heard of it before. It shrinks to 50% of it's original diameter when it's heated; the shrinking is irreversible though, so make sure you do it right the first time, otherwise you need to slice it off and try another piece. It's really useful though; I use it for wire splices, and even for a sort of lighting mod. I have some old cold cathode flourescent bulbs (a year, if that can be called old), which came out before caps on the ends of the acrylic tubes were available. I used 2 pieces of heatshrink over each end to make caps; they work quite well actually.
Also, do NOT use a lot of solder, and do not keep the iron against the chip's leads for more than just a couple seconds, or else you could heat it up and damage it.
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