2500k should do "about" the following...
4.0Ghz 1.150v
4.2Ghz 1.200v
4.4Ghz 1.250v
4.6Ghz 1.300v
4.8Ghz 1.400v
Those are about the range I saw with my 2600k which is pretty much the same as your 2500k aside from being 100mhz faster stock and hyperthreading.
For wanting to stick to auto voltage, I'd be careful as the voltage ramps with the VID which at higher clocks can get pretty nuts. I hit 1.3v at 4Ghz with auto voltage on my chip. If you're wanting to keep stock voltage like operation (drops when idle), then you need to learn about Voltage Offset and how to overclock with it.
For an example.. here's my setup..
I am currently sitting at a 44x multiplier with Voltage Offset set to -0.040v. This keeps me below 1.3v at full load and I still drop to 0.9v at an ilde. Each chip is different so don't think your chip will work like this right off rip. You need to learn about offset voltages before you even think about using it.
As for learning where your chip will go... Set a fixed voltage of 1.150v and start jumping up slowly and testing stability. The 620 will get you a decent clock, but either way keep an eye on those temperatures. I'd imagine you could get 4.4Ghz like I have without too much of a heat issue at 1.250v or so on fixed voltage.
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