parasyght - I understand now that you had to do some hacking and soldering on your v3 because the stock unit doesn't have the split voltage. However it seems that I recall reading somewhere that the v4a, v4b, and v5 - all the models that come with the Rise 266 CPU installed - already have a split voltage, and that the vcore for the RISE chip models is already set to 2.4v - the same as what you're seeing reported in your BIOS.
My questions then are;
1) Do you know if my recollections are correct about the stock vcore for the Rise 266 CPU versions?
2) Have you actually measured the vcore after your mods, or are you relying on what the BIOS is reporting?
3) Do you know how the performance of the K6II-300, overclocked to 366, compares to the K6III-333 running at 333, but having all of its extra on-chip cache? Have you run any benchmarks?
4) Are you having any heat-related problems? The K6-II is a 2.2 vcore chip, (as is the K6III-333) and a .2v "bump" up to 2.4vcore isn't that much (9%) I would expect it to create some extra heat - especially since you're overclocking it by 22% (you must have gotten a REALLY good one - most AMDs will only tolerate about a 10-15% overclock in my experience). What are you using for cooling, a lasagna?
5) You mentioned the "dropping resistor" - are you talking about putting a current limiting resistor on Q16, or a vcore voltage dropping resistor?
6) How about power problems? Did you have to install the 0.12 ohm power resistor?
Basically if you've verified that you are truly running at a 2.4vcore, and aren't having heat problems, without doing the Q16 re-work, or the power resistor mod, then it sounds like it may be possible to do a "drop in and go" with the K6II or k6III processors on the v4a, v4b, and v5 I/Os.