I finally took time away from schoolwork and did the vDimm=vIO mod on my NF7-S v2. WOW!!! So far I'm only doing testing on one stick of Speed Premium, but it is doing awesome! Before the mod, selecting 2.9vDimm in bios (board max) and getting an actual 2.96v, the ram wouldn't do 2-2-2 at even 190 fsb and topped out at looser timings around 218 fsb.
After doing the mod, with vDimm=vIO=3.36v, I'm running Memtest with 2-2-2 timings at 242 fsb! This stuff REALLY likes voltage! This is also using a crappy 300w PSU, but voltages look good on it. I got errors at 245 fsb, but I think they were heat related because even though I had a fan blowing on them, the chips were pretty hot.
I did the mod differently than the way TicTac has posted. Instead of soldering to the Dimm vdd pins (tiny pins), I soldered to the vDimm capacitors (3 of the 4). So I have 3 wires running from the 3.3v terminals at the ATX plug, one to each capacitor. I measured vDimm and 3.3v under load and there is no voltage drop whatsoever so it turned out really well.
I'll post pics of the mod when I take the board back out in the next few days. Also, I'll do more testing and post back when I know how the other stick and dual channel works :)
Oh, and here's the info on my ram:
Twinmos Speed Premium pc3200, 2x512
Both sticks: 05064, 44D