S X ▁users ▁was ▁in ▁reality ▁a ▁CPU ▁replacement — a ▁ 4 8 6 D X ▁with ▁a ▁different ▁pin out — and ▁originally ▁cost ▁several ▁hundred ▁dollars ▁more ▁than ▁a ▁ 3 8 7 . ▁ ▁As ▁prices ▁on ▁Intel ' s ▁ 4 8 6 ▁line ▁fell , ▁Cy rix ▁found ▁it ▁more ▁and ▁more ▁difficult ▁for ▁its ▁ 4 8 6 S LC ▁and ▁D LC ▁CPU s ▁to ▁comp ete ▁and ▁released ▁a ▁fully ▁pin - compatible ▁version ▁of ▁the ▁ 4 8 6 S X ▁and ▁D X ▁in ▁ 1 9 9 3 . ▁ ▁The ▁ 4 8 6 D LC ▁did ▁not ▁see ▁w ides p read ▁use ▁among ▁large ▁O EM s , ▁but ▁it ▁was ▁widely ▁known ▁among ▁the ▁hardware ▁enthus iast ▁community ▁that ▁an ▁A MD ▁ 3 8 6 D X - 4 0 ▁or ▁Cy rix ▁ 4 8 6 D LC - 3 3 ▁could ▁keep ▁up ▁with ▁a ▁ 4 8 6 S X - 2 5 ▁at ▁a ▁lower ▁cost , ▁so ▁it ▁gained ▁a ▁small ▁following ▁among ▁budget - mind ed ▁enthus iast s . ▁It ▁was ▁also ▁sometimes ▁used ▁as ▁a ▁replacement ▁for ▁a ▁ 3 8 6 ▁CPU ▁to ▁give ▁a ▁small ▁speed ▁boost . ▁However , ▁the ▁ 4 8 6 D LC ▁was ▁not ▁designed ▁to ▁be ▁a ▁direct ▁CPU ▁replacement ▁and ▁could ▁lead ▁to ▁stability ▁problems ▁in ▁older ▁bo ards ▁it ▁was ▁not ▁intended ▁for . ▁" Cy rix "