CPU clock speeds

  Craig-289433 14:48 05 Jan 2006
Locked

Does the clock speed determine how fast a processor runs at.

Are there any other factors that need to be taken into account.

For example would a Athlon XP processor running at 2.0ghz be classed as the same speed as an Athlon 64 or Athlon Dual Core running at 2.0ghz

  Skills 14:56 05 Jan 2006

I think what would come into play here is the bus speed that those devices operate at.

For instance I have a P4 2.6 that runs on a FSB(front side bus) of 400Mhz you can also get a a P4 2.6 that runs on a 800Mhz FSB. Which is the faster CPU neither in terms of clock speed but the one that runs on the faster bus speed will be a better performer.

  Belatucadrus 15:03 05 Jan 2006
  SG Atlantis® 15:16 05 Jan 2006

yes, lots of factors.

The processor's cache L1 and L2 is another factor, this is where it holds data waiting to be executed.

  Skills 15:19 05 Jan 2006

Thats very true as you can have a pentium M mobile chip which has lower clock speeds operate as well as a desktop chip that has a higher clock rate. What helps is the fact that the pentium M's have a 2MB level 2 cache

  DieSse 15:23 05 Jan 2006

*Does the clock speed determine how fast a processor runs at.*

Yes and No. For a given processor, a faster clock will give a higher speed. However all processors do different amounts of work per clock cycle - so a processor which does more work per cycle will run faster than one that does less - eve at the same clock speed.

Also the amount of on-chip memory cache affects the processor throughput. One with more cache will do more work - once again. even at the same clock speed.


*For example would a Athlon XP processor running at 2.0ghz be classed as the same speed as an Athlon 64 or Athlon Dual Core running at 2.0ghz*

No, it wouldn't.

Dual-core and 64 bits are both other factors which affect performance too - generally speaking 64 bit processors would be faster than 32 bit - and dual-core will be faster thasn single core, but only where tha software can use dual-core properly.

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