I have everything on Maximum Performance on my T500 love it. But the CPU gets too hot to so fix this you would go to Start->Control Panel->Power Options->Maximum Performance (Whatever plan you're on this will work)->Change plan settings->Advanced Power Settings->Processor power management->Minimum processor state(make sure this is at 5%
->Maximum processor state(This is how you undervolt(underclock your processor)
If you like this please leave a kudo(click on the star) it really helps and if you would like help please PM me the link to your post in the forums so that other can use your problem to address and fix theirs.
My TPs: T500 2055-A77: P8600, ATI Radeon 3650, Windows 8 Pro x64, 4GB RAM, 240GB OCZ Agility 3 SSD , Ultrabay 100GB Hard Drive, Intel 5300, 1680x1050,BT 2.1, 8GB SD ReadyBoost(converted to bootable Ubuntu drive for recovery), WWAN Sierra 5720 from X60(s) Dell E173FP connected w/ VGA T61 7665-D61: T7300, NVS140M, 1440x900, Windows 7 Pro x64, 4GB RAM, 100GB Hard Drive, Ultrabay 80GB Hard Drive, Intel 4695, BT 2.1 (dead&scrapped for parts) T60 1953-D9U: T2300,Intel Integrated GMA945, 1024x768, Windows 8 Pro, 120GB Hard Drive,Intel 3945, 3GB RAM (only 2.5 usable)