Topic CYRIX_DX from CPU FAQ base


, ! , , , , , , ...


SU.HARDW.PC.MOTHERBOARD (2:5020/299) SU.HARDW.PC.MOTHERBOARD From : Aleksandr Konosevich 2:5004/9.7 Tue 27 Sep 94 12:51 Subj : . Cx486DX40? (. #$%) , Cx486DX/DX2 : 1) p pp p ( 10%-25% p p) 2) p (BYTE/WORD/DWORD MUL/IMUL 3/3/7 3) , p write-back write-through (, write-back "" p CCR2). p RESET', p, ... :( 4) / write burst mode p p 5) Green PC Features ( p p p p Advanced SMM). p Cyrix , .. 8 p - p p :( RES4 (LOADALL 486) ... --- * Origin: aleks@sibkom.omsk.su (2:5004/9.7) SU.HARDW.PC.MOTHERBOARD (2:5020/299) SU.HARDW.PC.MOTHERBOARD From : Aleksandr Konosevich 2:5004/9 Thu 25 May 95 13:15 Subj : thomposon (cyrix) 486dx2-50 05 May 1995 18:41, egor nicolaev wrote in a message to All: en> . ? , p Cyrix Cx486DX/DX2 ( SGS Thompson) p p i486/Am486 : 1) p (8 ) pp write-back 2) write buffers (4 -> 8) 3) p p (byte*byte, word*word -> 3 clock count, dword*dword -> 7 clock count) 4) pp p ( i486, 2x p cache misses) 5) p p pp 6) pp p p , i486 7) p p p FPU 8) p p SMM ( - SL-p) 9) p software H : 1) p p i486/Am486. 2) "" SysInfo (. p) --+ | V ------------------------------------------------------------------------------ Dear Aleksander, The Norton benchmark is very inaccurate. YOu will find that the figure of 113.5 is correct for the Cyrix CPU. This of course does NOT mean that our chip is 20% slower. The Norton benchmark uses only a very small number of instructions in a very tight loop of code. Since our CPU was designed from scratch, 35% of instructions run about the same speed as Intel, 35% run faster and 30% slower than Intel. It just so happens that the benchmark for Norton uses a mix of instructions that we are slower on. This is well demonstrated by the fact that if you use Norton SI version 6 with a 66MHz Cyrix CPU it says it is an Intel running at 76MHz - it computes the clock speed by timing a known loop of instructions and then working out the equivalent clock speed. This loop of code is predominantly made up of instructions which the Cyrix CPU runs faster, since the program doesn't specifically recognise the Cyrix CPU, it presumes it is an Intel running at what it thinks is 76MHz! Hope this explains the situation, Regards Peter Farrow. ----------------------------------------------------------------------------- 3) p i486/Am486 ... |))))) : Cyrix . Cx486DX2-V-80 or V-100 MHz ... With best wishes, Aleksandr P.S. , - ? ;) --- * Origin: eshslabs@univer.omsk.su (2:5004/9)

Return to the main CPU FAQ page