If you are talking about overclocking a TI-84+, I say: go for it, though you will have a hard time.
If you are talking about overclocking a TI-84+
Silver, I say: you've gone nuts, that's the fastest z80 calculator other than the TI-86!
All I know about overclocking is that if you mess up, your warranty does not cover it, so be
VERY careful when overclocking. If you succeed, however, you will be envied by your whole school!
BTW, welcome to Omnimaga! Please visit the "Introduce yourself" section so we can bust out the peanuts!