I have overclocked all my MDD FW400 macs with dual ring CPUs from 1.25 to 1.5ghz L3 2mb with no issues. I increased the voltage to 1.60v,
stable for years. very happy with these.
Different story for MDD FW800 with three-ring CPU. even just changing from 1.4 to 1.5 ghz gave me L3 loss, but how is this possible?
Is there a different process to overclock these CPUs without problems while maintaining L3?
To eliminate the heat problem I recently bought a 360 liquid heatsink which I adapted to the Mac heatsink, it works very well.
one of the three ring CPUs I managed to reach stable at 1.67 ghz (1.75 never managed to start mac even with different voltages..)
but you can't see it from L3. the system tells me in information "diagnostic failed". I would love to have the L3 on this one.
Has anyone had any problems with L3 on 3-ring CPUs? 3 CPUs on which I tried overclocking, both 1.25 and 1.4 GHz always lost L3..
I read on a site that to get the L3 back you need to increase the L3 voltage but no indication of how to do it,
Can anyone kindly help me?