"Overclocking Limits
Thunderbird
For the Thunderbird, I only managed to reach 105MHz FSB stably (105 x 7 = 735MHz) using the beta BIOS. Despite upping the Vcore to its max settable 1.80V, I still couldn’t push it any further.
But as I had to return the loaned Thunderbird to the local MSI distributor, I couldn’t personally verify if it manages higher FSBs under the revised V1.20 MSI BIOS.
(Yet, I did receive an email afterward from the local MSI distributor, stating that the new BIOS enabled that particular Thunderbird to attain 110 FSB comfortably.)
Duron
For the Duron, I achieved better results, reaching 110MHz FSB (110 x 6.5 = 715MHz) without problems under a default Vcore setting! On the revised V1.20 BIOS, I managed slightly higher – 111MHz FSB (111 x 6.5 = 722MHz).
I also discovered that both CPUs seemed highly dependent on Vio increments, where it had to be increased from 3.30V to 3.45V for overclocking stability. For some unknown reason, increasing Vcore values doesn’t seem to help overclocking.
Yet, I believe that implementing a better cooling facility may alleviate this, as both CPUs already run quite hot at default settings. Coupled with the stock Intel heatsink / fan combo, the Thunderbird and Duron runs at 42 deg C & 36 deg C respectively! Moreover, this is under an open case environment of 25 deg C ambient temperature!
With only a 5 to 10% increase in FSB possible, this points (again) to instabilities from an overclocked EV6 200MHz bus. There is definite potential for faster clock-rates judging from the ability to overclock at default Vcore settings. Just that this may only be achieved with a multiplier unlock facility. "
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