Is your overclocking accurate? (Core 2 Duo E4600 running at 2.4 GHz to 3.0 GHz)
Is your overclocking accurate? (Core 2 Duo E4600 running at 2.4 GHz to 3.0 GHz)
BFG-9000:
It's not necessary to use a multiplier greater than 1:1, as your BIOS lists 2.00. Remember that your chipset is only officially supported by Intel for 533 or 800 FSB speeds (the 133 and 200 options in your BIOS), which are the settings you have in your BIOS. This means you might need a slightly higher MCH/Northbridge voltage than the default to achieve 1333 MHz. Since your picture doesn't show any adjustment for that, it seems you're limited by FSB speed, so I suggest testing with a 12 x 267 = 3.2GHz configuration at a memory multiplier of 2.00. You may need to increase the CPU voltage slightly.
The lowest chip I've seen in 65nm form factor had a VID of 1.3250v. The range from 0.8500V to 1.5V is just the voltages Intel considered possible, and it's likely they pushed up to 1.5V for better yields. If AMD had offered any real competition at that time (which they didn't), then the spec would have stated a maximum safe voltage of 1.55V for longevity, though it doesn't ensure proper performance at that level. It's probably acceptable to go up to 1.5625V if necessary, but this would likely reduce efficiency significantly. However, with sufficient voltage, stability above 90°C is achievable, especially in laptops.
I recommend checking the cooler, as the chip draws less than 50W under load (even though it has a 65W TDP), so it shouldn't be overheating at just 3.0GHz.
I attempted 12 x 267 = 3.20 GHz with a memory multiplier of 2.00, then reset to 12 x 200 = 2.40 GHz after saving and rebooting. This time the system remembered my settings on startup but failed to boot the disk properly on the second loading screen.
Voltage still seems quite low. Given they sold 2.4GHz chips at 1.3250v VID, and never produced a 65nm chip running faster than 3.0GHz, not even the $1000 Extreme Editions with higher TDP, Intel likely assigned your chip a 2.4GHz @ stock voltage. You probably won't see an 800MHz boost unless you push it further. Try at least 1.4v and see if stability improves.