plz tell me why does Intel Core 2 Extreme X6800 with 65nm architecture, 4mb l2 cache, dual core 2.93 GHz and 1066mhz FSB outperform a seemingly better Inter Pentium Extreme 965 with 65nm architecture, 2x2mb l2 cache dual core at 3.73GHz and 1066mhz FSB ?
It's a new architecture which means it's ability to execute more instructions per clock cycle has improved --- significantly as it would appear.
http://www.intel.com/technology/architecture/coremicro/demo/demo.htm
Edit:
I have gone through this a few times through the forums, it's ok to go through it again.
The computational performance that you and I observe, that is how fast does a software algorithm take to complete it's function, is not just the clockspeed of the processor alone. It is actually a function of how much work can be done in one clock tick and the speed of the clock ticks. Mathematically it can be expressed as:
Observed Computation Performance (instructions/sec) = IPC (instructions/clock tick) X Clock speed ( clock tick/sec)
For example, and these are just wild number out of the air to illustrate the concept, say the P4's have a horrid IPC, that is on average they can complete 1.5 instructions per clock tick, the AMD chips are good at IPC efficiency and complete, on average 3 clock ticks per second. So AMD chips could perform as well as a P4 at hald the clocks speed because they complete twice as many instructions in one duty cycle.
So here you go:
P4: Observed computational performance = 1.5 X clock speed.
K8: Observed computational performance = 3.0 X clock speed.
C2D: Observed computational performance = 4.5 X clock speed.
In short order one architecture can leap frog over the other without necessarily pushing clocks to the max. C2D> K8 > P4.
This was actually the reason for the in the difference in approach, Intel had always had success in process technology and getting clock speeds to go way up, AMD always lagged intel in process technology and to compete performance wise worked to design better IPC efficiency. As a result, Intel designed the P4 which was intended to allow clock speeds to scale very very high (which, of course, physics did not let them do) where as AMD focused on getting IPC up and released the k8 -- great product and great timing.
Jack
Lol.. I PM'd him that info..