▁the ▁ 4 8 6 S X , ▁it ▁could ▁make ▁use ▁of ▁an ▁Intel ▁ 3 8 7 D X ▁or ▁compatible ▁numeric ▁cop ro cess or . ▁A ▁few ▁ 4 8 6 S X ▁mother boards ▁also ▁provided ▁i 3 8 7 ▁so ckets , ▁but ▁this ▁feature ▁was ▁a ▁very ▁much ▁a ▁r ar ity . ▁Due ▁to ▁the ▁smaller ▁L 1 ▁cache , ▁the ▁ 4 8 6 D LC ▁could ▁not ▁comp ete ▁on ▁a ▁clock - for - clock ▁basis ▁with ▁the ▁ 4 8 6 S X , ▁but ▁a ▁ 3 3   M Hz ▁ 4 8 6 D LC ▁could ▁keep ▁pace ▁with ▁a ▁ 2 5   M Hz ▁ 4 8 6 S X , ▁cost ▁less , ▁and ▁offered ▁the ▁ability ▁to ▁upgrade ▁further ▁with ▁the ▁addition ▁of ▁an ▁in exp ensive ▁math ▁cop ro cess or . ▁ ▁While ▁some ▁advert is ements ▁in ▁PC ▁mag az ines ▁from ▁smaller ▁manufact ur ers ▁tout ed ▁the ▁superior ity ▁of ▁their ▁ 4 8 6 D LC ▁over ▁name - brand ▁computers ▁sport ing ▁a ▁ 4 8 6 S X , ▁in ▁reality ▁the ▁only ▁advantage ▁the ▁ 4 8 6 D LC ▁offered ▁feature - wise ▁over ▁the ▁ 4 8 6 S X ▁was ▁the ▁ability ▁to ▁add ▁an ▁in exp ensive ▁math ▁cop ro cess or . ▁The ▁Intel ▁ 4 8 7 ▁" math ▁cop ro cess or " ▁for ▁ 4 8 6