Is your battery life or stock cooling solution really so bad that it's necessary to shave off 1GHz? I only started undervolting to address the horrendous temepratures whenever mine is on AC reduced turbo bins and -0.1V reduces my plugged in temps 15-20c. I really don't know if capping it to 3GHz is desirable on this CPU. On battery, it never goes to 4GHz anyways, and never really gets that hot. I experimented for a little while with slightly reduced turbo bins across the board, but that just made it slower when on battery. Most people recommend up to -0.1V for stability, with -0.08V being assuredly achievable with just about every chip. No stability issues, but i also don't play games on my ultrabook so ymmv. It works well enough for productivity and media. However, mine is an XPS 9370 and doesn't have a discrete GPU. I have my 8550U at -0.1V core and -0.08V cache.
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