880mhz, you must be overclocking with the FSB, right? Are you using the KT133 chipset? not the KT133A? If so, the KT133 chipset on all of the first AMD TBird/Duron motherboards is not stable much beyond 110mhz FSB. You can up the I/O voltage to 3.5 volts, and the CPU Core voltage up to 1.85 volts without much of a worry, but if you have the KT133 chipset, you are going to be limited by it. What you need to do is use a pencil to connect the L1 bridges on the top of the CPU, and adjust the CPU multiplier with the motherboard to 9, 9.5, or 10, etc.. to achieve a higher speed. What mobo are your using?? This will tell us what you can do with your CPU.