Only thing I can think of is to:
2. Update motherboard drivers
3. Make sure Memory isn't OCed (not that anything over 1600MHz helps) so that Integrated Memory controller isn't stressed
4. Internal PLL Overvoltage - Enabled
shouldn't be a normal thing for 4.2GHZ... but if you really need it you can try that
5. Try tweaking CPU Power Phase Control to a higher setting so more phases are active at all times at the cost of power consumption
CPU Power Phase Control (Click to show)
Controls the CPU Power Phase Control to decide if the CPU VRM should reduce the number of active phases (Standard / Optimized / Extreme / Manual Adjust) to allow better power efficiency when the system idles down. Once set to Manual Adjust mode, user can also define how fast the PWM phase should vary with respect to the loading applied on it (Ultra Fast / Fast / Medium / Regular).
Benchmarkreviews' take on Power Phase Control (Click to show)
CPU Power Phase Control -
This setting controls phase switching policies for idle and moderate load. When set to default operation of standard phase switching will be 1 to 4 phase, optimized will default switching operation to 1,2,4,6 onward in increments of 2 until maximum phase count is reached. Extreme will force phase switching to no longer be active and maximum phase array will be enabled at idle and full load. Regardless of defined parameter once under full load phase switching will put maximum phase array under load. The general recommendation for this setting is optimized for most situations and for moderate overclocking as well. This setting generally will provide fast enough response and power delivery up to 4.8GHz. This setting should ideally be matched with considerations for LLC, C States and Vid options (manual or offset). Such as an overclock of 46x should ideally use an offset voltage, with T.Probe loading policy and a phase control setting of optimized or standard. In addition if all C states should be active and LLC should be disabled this would provide a good mix of increase performance but minimized thermal increase (at idle, moderate load and full load) as well as less consistent voltage being supplied to the CPU.
Be advised this setting (when set to extreme) will produce more heat for the VRM and increase total system power consumption depending on which option is selected. It is advised this setting be used only when airflow is present for the VRM heatsink assembly. * Cooler operation of the VRM ensures superior efficiency and maximum current delivery under either setting.
Otherwise it's the chip , so my prior advice of junking it to get a new one is the best bet Edited by AlphaC - 4/23/13 at 7:03pm