▁clock ▁spe eds ▁and ▁fin er ▁sem icon duct or ▁fabric ation ▁processes ▁caused ▁excess ▁heat ▁generation ▁and ▁power ▁supply ▁concerns , ▁especially ▁regarding ▁laptop ▁computers . ▁Using ▁a ▁voltage ▁reg ulator , ▁the ▁external ▁I / O ▁voltage ▁levels ▁was ▁transformed ▁to ▁lower ▁volt ages ▁to ▁reduce ▁power ▁draw , ▁resulting ▁in ▁less ▁heat ▁for ▁the ▁ability ▁to ▁operate ▁at ▁higher ▁frequencies . ▁ ▁V RT ▁is ▁a ▁feature ▁on ▁older ▁Intel ▁P 5 ▁Pent ium ▁process ors ▁that ▁are ▁typically ▁intended ▁for ▁use ▁in ▁a ▁mobile ▁environment . ▁ ▁It ▁refers ▁to ▁splitting ▁the ▁core ▁voltage ▁supply ▁from ▁the ▁I / O ▁voltage . ▁ ▁A ▁V RT ▁processor ▁has ▁a ▁ 3 . 3 ▁V ▁I / O ▁and ▁ 2 . 9 ▁V ▁core ▁voltage , ▁to ▁save ▁power ▁compared ▁to ▁a ▁typical ▁Pent ium ▁processor ▁with ▁both ▁I / O ▁and ▁core ▁voltage ▁at ▁ 3 . 3 V . ▁ ▁All ▁Pent ium ▁MM X ▁and ▁later ▁process ors ▁adopted ▁this ▁so - called ▁split ▁rail ▁power ▁supply . ▁ ▁See ▁also ▁▁ ▁Dynamic ▁voltage ▁scaling ▁ ▁Switch ed - mode ▁power ▁supply ▁applications ▁( S MP S ) ▁ ▁References ▁ ▁External ▁links ▁ ▁Hard ware analysis . com ' s ▁article ▁about ▁how ▁to ▁increase ▁voltage ▁to ▁help ▁over clock ing ▁An ▁Illustr ated ▁Guide ▁to ▁Pent iums ▁( Kar bos ▁Guide ) ▁Process or ▁Vol t age ▁>> ▁PC ▁Mechan ic ▁ ▁Category : Cent ral ▁processing ▁unit ▁Category : X 8 6 ▁architecture