So I've determined that 4.8 GHz is attainable on my air-cooled scrapheap, although just barely. But I don't like that part and all that for a smidge less of performance. I could potentially delid the CPU to lower the temps by 7-10°C but I'm not liking those voltages either way.
These are the achieved overclocks at the different voltage stages:
40x100 at 1.010V --- Input Voltage at 1.700V --- ~45°C (4.0 GHz - 25% overclock)
42x100 at 1.100V --- Input Voltage at 1.900V --- ~49°C (4.2 GHz - 31% overclock)
45x100 at 1.200V --- Input Voltage at 1.900V --- ~57°C (4.5 GHz - 41% overclock)
47x100 at 1.300V --- Input Voltage at 1.900V --- ~68°C (4.7 GHz - 47% overclock)
48x100 at 1.375V --- Input Voltage at 2.150V --- ~90°C (4.8 GHz - 50% overclock)
What I'm going to try next is to gain as much as I can from 1.2V Core and see how much I can lower the input voltage. 4.5 to 4.6 GHz is going to be the focus now.
Some lessons I took away from this:
- an AsRock Z87E-ITX can be an excellent overclocking tool
- the G3258 is a lot of dual-core performance and OC'ing toy for the low price
- this shouldn't be done in a packed air-cooled mITX case with low noise in mind
- overclocking Haswell feels much more confident than the Core 2 platforms and earlier
