Hi guys, So, I picked up a cheap 8800GTX recently and I'm looking to do both the vGPU and vMem mods to increase my "overclockability". I have the card on water; and under load with 648/1620/2106 clocks, it never gets above 39C. It's been a long time since I volt modded a card and I'd like to make sure I don't make any silly mistakes. I'm basing it on this guide. Checking on XS, it appears the "safe" voltages seem to be around 1.5V for the core/shaders (stock 1.3V) and 2.1-2.2V (stock 1.9V) for the memory. Most guides I have found suggest using a 400ohms or 500ohms resistor for the vGPU mod and a 20Kohms resistor for the vMem. However, many users have opted for a 1Kohm resistor for the core instead. What would be the benefit of this? More resistance = lower volts presumably? Would it allow more flexibility/stability than a 500ohm jobbie? Also, where's the best place (UK) to buy some high quality variable resistors? I checked with Maplins etc and I want to make sure I don't end up with cheap nasty one's that'll break in 5mins. Any final words of advice before I fire up the soldering iron and take the plunge? EDIT: Hmm just found this. He suggest that a 500ohm resistor will result in massively high volts (up to 2.6V) that could be fatal to a card. He suggests a 20Kohm variable resistor. This seems at odds with what everybody else has said though. Tbh though, I'd rather er on the side of caution. Anybody capable/willing to look at the calculations and pass their judgement?
Using a DMM i measured my vGPU and vMem. They came up as 1.28V and 2.2V respectively. Anbody got any ideas? Could someone at least point me to a supplier of quality VRs? That way I can buy a few, start with a higher (say 20K on each) VR and then change if need be. Thanks
