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Internet Message Format  |  1992-08-31  |  2.4 KB
  1. Path: sparky!uunet!cs.utexas.edu!uwm.edu!bionet!raven.alaska.edu!sxjcb.uacn.alaska.edu!user
  2. From: sxjcb@orca.alaska.edu (Jay C. Beavers)
  3. Newsgroups: comp.sys.ibm.pc.hardware
  4. Subject: Re: 386dx 486sx 486dx - what's the difference?
  5. Message-ID: <sxjcb-310892165108@sxjcb.uacn.alaska.edu>
  6. Date: 1 Sep 92 00:53:35 GMT
  7. References: <1992Aug31.234312.5571@wuecl.wustl.edu>
  8. Sender: news@raven.alaska.edu (USENET News System)
  9. Followup-To: comp.sys.ibm.pc.hardware
  10. Distribution: usa
  11. Organization: University of Alaska Computer Network
  12. Lines: 44
  13. Nntp-Posting-Host: sxjcb.uacn.alaska.edu
  14.  
  15. In article <1992Aug31.234312.5571@wuecl.wustl.edu>, cet1@cec2.wustl.edu
  16. (Chuck Turco) wrote:
  17. > 
  18. > FAQ:  What's the difference (in performace and math-coprocessor and 16
  19. > vs. 32 bit) between a 386DX, a 486SX, and 486DX?
  20. > 
  21. > Thanks for any response,
  22. > Chuck
  23. > ---
  24. > Chuck Turco
  25. > Washington University in St. Louis, School of Engineering
  26. > cet1@cec1.wustl.edu
  27.  
  28.                                         386SX  386DX  486SX  486DX  
  29.  
  30. Fewer Clock Cycles Per Instruction?      no     no     yes    yes
  31. Internal 8k Cache?                       no     no     yes    yes
  32. Internal Math Co-Processor?              no     no     no     yes
  33. 32 Bit bus?                              no     yes    yes    yes
  34. External 64k-256k Cache?                maybe  maybe  maybe  maybe
  35.  
  36. Fewer Clock Cycles per instruction    ~60% Speed Increase in Normal
  37. Operation
  38. Internal 8k Cache                     ~15% Speed Increase in Normal
  39. Operation
  40. Internal Math Co-Processor            ~10x Speed Increase in Floating Point
  41. 32 Bit Bus                            ~15% Speed Increase in 32 bit OSes
  42. External Cache                        ~5%-35% Speed Increase depending on
  43. DRAM
  44.                                            refresh, whether there is an
  45. internal
  46.                                            cache, how well it was
  47. engineered
  48.  
  49. These figures are approximations made from lots of benchmarking and lots of
  50. magazine reading over a few years from a person who owns a 386DX/25 and a
  51. 486DX/25.  They should not be construed as 'burnt in stone' fact, but as
  52. good estimations (IMHO).
  53.  
  54. ______________________________________________________________________________
  55.                                         |    jay@seaspray.uacn.alaska.edu
  56. Jay C. Beavers                          |    sxjcb@orca.alaska.edu
  57. University of Alaska Computer Network   |    sxjcb@alaska.bitnet
  58. ________________________________________|_____________________________________
  59.