手元にiMacが無く特にネタはないので、iMac届いたばかりの時に取ったベンチマークの結果でもあげておきます。使ったのはXbenchです。
まず、Mac mini。
Results 94.37
System Info
Xbench Version 1.3
System Version 10.4.10 (8R2218)
Physical RAM 2048 MB
Model Macmini1,1
Drive Type FUJITSU MHV2060BHPL
CPU Test 64.47
GCD Loop 217.84 11.48 Mops/sec
Floating Point Basic 75.71 1.80 Gflop/sec
vecLib FFT 37.53 1.24 Gflop/sec
Floating Point Library 56.81 9.89 Mops/sec
Thread Test 163.60
Computation 146.31 2.96 Mops/sec, 4 threads
Lock Contention 185.52 7.98 Mlocks/sec, 4 threads
Memory Test 98.21
System 95.17
Allocate 85.43 313.74 Kalloc/sec
Fill 94.74 4606.71 MB/sec
Copy 107.96 2229.83 MB/sec
Stream 101.45
Copy 84.51 1745.58 MB/sec
Scale 82.61 1706.67 MB/sec
Add 130.56 2781.18 MB/sec
Triad 127.67 2731.15 MB/sec
Quartz Graphics Test 110.50
Line 94.66 6.30 Klines/sec [50% alpha]
Rectangle 107.82 32.19 Krects/sec [50% alpha]
Circle 105.29 8.58 Kcircles/sec [50% alpha]
Bezier 102.63 2.59 Kbeziers/sec [50% alpha]
Text 162.15 10.14 Kchars/sec
OpenGL Graphics Test 188.63
Spinning Squares 188.63 239.29 frames/sec
User Interface Test 259.22
Elements 259.22 1.19 Krefresh/sec
Disk Test 41.40
Sequential 62.50
Uncached Write 61.96 38.04 MB/sec [4K blocks]
Uncached Write 60.94 34.48 MB/sec [256K blocks]
Uncached Read 58.56 17.14 MB/sec [4K blocks]
Uncached Read 69.56 34.96 MB/sec [256K blocks]
Random 30.95
Uncached Write 11.59 1.23 MB/sec [4K blocks]
Uncached Write 64.88 20.77 MB/sec [256K blocks]
Uncached Read 62.65 0.44 MB/sec [4K blocks]
Uncached Read 86.16 15.99 MB/sec [256K blocks]
次にiMac。
Results 145.70
System Info
Xbench Version 1.3
System Version 10.4.10 (8R4031)
Physical RAM 4096 MB
Model iMac7,1
Drive Type WDC WD3200AAJS-40RYA0
CPU Test 122.35
GCD Loop 283.10 14.92 Mops/sec
Floating Point Basic 135.94 3.23 Gflop/sec
vecLib FFT 95.01 3.13 Gflop/sec
Floating Point Library 88.66 15.44 Mops/sec
Thread Test 241.14
Computation 219.27 4.44 Mops/sec, 4 threads
Lock Contention 267.85 11.52 Mlocks/sec, 4 threads
Memory Test 148.88
System 137.92
Allocate 130.04 477.55 Kalloc/sec
Fill 137.67 6693.63 MB/sec
Copy 147.12 3038.75 MB/sec
Stream 161.73
Copy 149.72 3092.36 MB/sec
Scale 154.80 3198.10 MB/sec
Add 172.49 3674.51 MB/sec
Triad 172.53 3690.88 MB/sec
Quartz Graphics Test 162.23
Line 152.20 10.13 Klines/sec [50% alpha]
Rectangle 185.99 55.53 Krects/sec [50% alpha]
Circle 177.44 14.46 Kcircles/sec [50% alpha]
Bezier 164.00 4.14 Kbeziers/sec [50% alpha]
Text 140.06 8.76 Kchars/sec
OpenGL Graphics Test 128.51
Spinning Squares 128.51 163.03 frames/sec
User Interface Test 426.09
Elements 426.09 1.96 Krefresh/sec
Disk Test 78.65
Sequential 123.72
Uncached Write 138.12 84.80 MB/sec [4K blocks]
Uncached Write 133.24 75.39 MB/sec [256K blocks]
Uncached Read 90.39 26.45 MB/sec [4K blocks]
Uncached Read 153.35 77.07 MB/sec [256K blocks]
Random 57.65
Uncached Write 22.72 2.40 MB/sec [4K blocks]
Uncached Write 156.51 50.11 MB/sec [256K blocks]
Uncached Read 86.72 0.61 MB/sec [4K blocks]
Uncached Read 134.32 24.92 MB/sec [256K blocks]
トータルResultで比較するとそれほどの違いはありませんが、CPUやHDDはダブルスコアですから、普段使っていて体感できるほどの違いということになると思います。実際、iMac、速いっすよ～!!