▁instructions ▁per ▁clock , ▁process ors ▁from ▁Intel ▁and ▁A MD ▁feature ▁branch ▁predict ors . ▁The ▁Cell ▁is ▁designed ▁to ▁compens ate ▁for ▁this ▁with ▁compiler ▁assistance , ▁in ▁which ▁prepare - to - branch ▁instructions ▁are ▁created . ▁For ▁double - prec ision ▁floating ▁point ▁operations , ▁as ▁sometimes ▁used ▁in ▁personal ▁computers ▁and ▁often ▁used ▁in ▁scientific ▁computing , ▁Cell ▁performance ▁dro ps ▁by ▁an ▁order ▁of ▁magnitude , ▁but ▁still ▁reaches ▁ 2 0 . 8   G F LO PS ▁( 1 . 8   G F LO PS ▁per ▁S PE , ▁ 6 . 4   G F LO PS ▁per ▁P PE ). ▁The ▁Power X Cell ▁ 8 i ▁variant , ▁which ▁was ▁specifically ▁designed ▁for ▁double - prec ision , ▁reaches ▁ 1 0 2 . 4   G F LO PS ▁in ▁double - prec ision ▁calculations . ▁ ▁Test s ▁by ▁IBM ▁show ▁that ▁the ▁S PE s ▁can ▁reach ▁ 9 8 % ▁of ▁their ▁theoretical ▁peak ▁performance ▁running ▁optimized ▁parallel ▁matrix ▁multiplication . ▁ ▁T os hib a ▁has ▁developed ▁a ▁co - processor ▁power ed ▁by ▁four ▁S PE s , ▁but ▁no ▁P PE , ▁called ▁the ▁Sp urs Engine ▁designed ▁to ▁acceler ate ▁ 3 D ▁and ▁movie ▁effects ▁in ▁consumer ▁electron ics . ▁ ▁Each ▁S PE ▁has ▁a ▁local ▁memory ▁of ▁ 2 5 6 ▁K B . ▁In ▁total , ▁the ▁S PE s ▁have ▁ 2 ▁MB ▁of ▁local ▁memory . ▁