The mod is good for about 20-40MHz. I was able to tighten up my timings as well. See my other comments below.

Quote Originally Posted by jason4207 View Post
Both my GT and GTS have Qimonda RAM chips. I wish I had some Samsung's! The way I understand it is that both the vRAM, and the memory controller are fed from the same voltage line. The vRAM by itself should respond better to more voltage, and I think the specs have them listed up to 2.5v. The problem arises b/c the memory controller doesn't respond well to voltage. So, if you start raising the voltage you are just making the controller crash, and that is seen as the memory avalanche.

There is a definite 'sweet spot' that I was able to find on both cards. The GT liked ~1.84v, and the GTS liked ~1.96v iirc. Dialing in that sweet spot actually had me making the smallest turns possible on the VR to find that spot b/n memory avalanche (red or green crap all over the screen) w/ lock-up if the voltage was too high, and just plain lock-up if the voltage was too low. Those last few changes I made to the VR in finding the sweet spot didn't even register on my DMM, but they did allow me to pass 8 loops of 'Battle of Proxycon' form 3DMark03 at 1 higher notch on the slider. On my GTS I started at 1062 stock to 1101 w/ the mod. That was pretty easy, but it was tedious work to get 1107. On my GT I was able to go from 1026 stock to 1056 w/ the mod, but had to go back down to 1044 after I increased the core/shader clocks and voltage.

I forgot to mention this above, but a big thanks goes out to Viper John for all his highly informative help he gave me via email. And also to all you guys here like Largon who helped to find these mods. I'm not sure who all found what, but kudos to you gentlemen. My knowledge has increased 10 fold in the past couple months as I've researched, prepared, and then accomplished these mods.

Thank you!