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Originally Posted by WindWalker
I'd like to know why the AMD has a big number and then runs at a lower speed like this: AMD Athlon XP-M 2800+ (1.60 GHz/128K L2 cache)
AMD Athlon(TM) XP-M 3000+ (1.60 GHz/256K L2 cache)
AMD Athlon(TM) 64 3000+ 1.80 GHz
AMD Athlon(TM) 64 3200+ 2.00 GHz
AMD Athlon(TM) 64 3400+ 2.20 GHz
AMD Athlon(TM) 64 3700+ (2.40 GHz)
You see the numbers and automaticaly think it would run at the highest of 3.7ghz but only at the 2.4 ghz. what is up with that? is the rest all cache and why would that be such a good thing to have lack of power?
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This has been discussed to repeatedly in computer and tech forums everywhere. If you google Intel vs AMD etc. you'll find a ton of information on the subject.
But to answer your question. Simply put to measure a CPU's performance only on clock speed (Ghz) is miss leading. You also have to take into account the amount of work that the CPU completes in a single clock cycle.
A 3.4 Ghz Intel CPU does about the same amount of work as a 2.2 Ghs Athlon does in the same amount of time hence the 3400+ rating AMD gives for comparison.
A good example would be comparing a sports car (Intel) to a pickup truck (AMD). The sports car is definitely faster than the pickup but if you needed to deliver cargo from one place to another the sports car might need to make 4 trips back and forth while the truck only needs to make one trip and they finish at the same time.
Lastly, Intel has always wanted people to believe that CPU speed (Ghz) is the sole measure of performance. They done it in advertizing and even engineered the P4 netburst architecture to allow for faster and faster speeds. But now the silicon can't sustain the speed growth that Intel wants. The chips just get too hot.
So in short, don't compare the speeds of the chips. Compare benchmarks and over all performance. AMD's rating system is a good comparison though bias at times, but it's good enough.
Hope that helps.