Performance (Xbench) and Apple's claim of 7x speed (Score 2, Informative)

I've heard that Apple is claiming that the new Core2 Duo is 7 times faster than the old "top of the line" 1.67Ghz PowerBook. But comparing the XBench output that was posted earlier to an XBench run that I just ran (see below my signature) shows only a 2x increase in almost every single category (there was one or two that were about 2.5 times higher).

But nowhere near 7 times.

How can they make such a claim? I could understand missing by a few percentage points, but their claim is WAY off reality.

And, yes, I have the same amount of memory and the same OS that was used on the new tests.... The only difference was physical hardware.

Steve

Results 51.32
System Info
Xbench Version 1.3
System Version 10.4.8 (8L127)
Physical RAM 2048 MB
Model PowerBook5,6
Processor PowerPC G4 @ 1.67 GHz
L1 Cache 32K (instruction), 32K (data)
L2 Cache 512K @ 1.67 GHz
Bus Frequency 167 MHz
Video Card ATY,RV360M11
Drive Type Hitachi HTS541010G9AT00
CPU Test 70.93
GCD Loop 139.85 7.37 Mops/sec
Floating Point Basic 48.47 1.15 Gflop/sec
AltiVec Basic 288.78 11.51 Gflop/sec
vecLib FFT 51.03 1.68 Gflop/sec
Floating Point Library 50.90 8.86 Mops/sec
Thread Test 71.85
Computation 68.48 1.39 Mops/sec, 4 threads
Lock Contention 75.57 3.25 Mlocks/sec, 4 threads
Memory Test 39.47
System 35.49
Allocate 131.05 481.25 Kalloc/sec
Fill 35.04 1703.52 MB/sec
Copy 20.67 427.03 MB/sec
Stream 44.46
Copy 49.15 1015.26 MB/sec [altivec]
Scale 50.02 1033.46 MB/sec [altivec]
Add 42.70 909.66 MB/sec [altivec]
Triad 38.14 815.87 MB/sec [altivec]
Quartz Graphics Test 69.74
Line 60.56 4.03 Klines/sec [50% alpha]
Rectangle 69.55 20.77 Krects/sec [50% alpha]
Circle 71.08 5.79 Kcircles/sec [50% alpha]
Bezier 78.81 1.99 Kbeziers/sec [50% alpha]
Text 71.21 4.45 Kchars/sec
OpenGL Graphics Test 85.41
Spinning Squares 85.41 108.35 frames/sec
User Interface Test 42.00
Elements 42.00 192.75 refresh/sec
Disk Test 30.13
Sequential 46.59
Uncached Write 46.44 28.52 MB/sec [4K blocks]
Uncached Write 45.47 25.73 MB/sec [256K blocks]
Uncached Read 45.28 13.25 MB/sec [4K blocks]
Uncached Read 49.40 24.83 MB/sec [256K blocks]
Random 22.26
Uncached Write 7.66 0.81 MB/sec [4K blocks]
Uncached Write 53.00 16.97 MB/sec [256K blocks]
Uncached Read 59.94 0.42 MB/sec [4K blocks]
Uncached Read 73.81 13.70 MB/sec [256K blocks]