It's pretty simple. You have to do it through your motherboard BIOS, you must have a BIOS that supports it. If you do have a BIOS that supports iGPU offset voltage, that basically overclocks the iGPU for you to my understanding. I use asus motherboards and most of them have this feature, and you can set the clockspeed as well within the BIOS.
The best thing really to do here is
consult your motherboard manual. You will be doing this in your BIOS settings and the methods will vary depending on manufacturer; but the principles are similar. Raise offset voltage, increase clockspeeds in BIOS. As far as what is safe in terms of voltage, I really don't know. I know what CPU voltage works for me with an H100i - for a Haswell chip you generally want to stay 1.25V or under. If your cooler sucks you want to be much lower than that. With Ivy, 1.275V or under. But if your cooler sucks you want to be under that. IT all depends on how good your cooler is.
Then again, I don't know how offset voltage works with the iGPU per se. I do not know if iGPU voltage is the same as CPU voltage. I haven't really tried it. I'd imagine if your'e doing offsets, you will want to do it in VERY SMALL increments while increasing clockspeeds - you want to increase offsets .05 at a time or something like that. Just go slow and take your time. And you will want a good cooler if you go nuts with over-voltage. I guess that might be the next thing i'll tinker with, if I can put up with the punishment of gaming with HD4600.
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