XBENCH Results:

G5 Score 219.30
G4 Score 156.90

System Version
G5 – 10.3.7 (7S215)
G4 – 10.3.7 (7S215)

Physical RAM
G5 – 1536 MB
G4 – 1024 MB

Model
G5 – PowerMac7,3
G4 – PowerMac3,6

Processor
G5 – PowerPC G5x2 @ 2.50 GHz
G4 – PowerPC G4x2 @ 1.42 GHz

L1 Cache
G5 – 64K (instruction), 32K (data)
G4 – 32K (instruction), 32K (data)

L2 Cache
G5 – 512K @ 2.50 GHz
G4 – 256K @ 1.42 GHz

Bus Frequency
G5 – 1 GHz (?? – should be 1.25 Ghz)
G4 – 167 MHz

Video Card
G5 – ATY,RV360
G4 – GeForce4 Ti 4600

Drive
G5 – ST3160023AS
G4 – ST3120024A

CPU Test
G5 – 201.5
G4 – 176.8

GCD Loop
G5 – 130.39
G4 – 176.41

G5 – 5.09 Mops/sec
G4 – 6.89 Mops/sec

Floating Point Basic
G5 – 318.40�>
G4 – 176.37

G5 – 1.15 Gflop/sec
G4 – 637.83 Mflop/sec

AltiVec Basic
G5 – 137.18
G4 – 175.19

G5 – 3.99 Gflop/sec
G4 – 5.09 Gflop/sec

vecLib FFT
G5 – 223.79
G4 – 179.15

G5 – 3.47 Gflop/sec
G4 – 2.78 Gflop/sec

Floating Point Library
G5 – 445.26�>
G4 – 176.93

G5 – 17.82 Mops/sec
G4 – 7.08 Mops/sec

Thread Test
G5 – 238.82
G4 – 193.18

Computation
G5 – 167.75
G4 – 178.61

G5 – 2.26 Mops/sec, 4 threads
G4 – 2.41 Mops/sec, 4 threads

Lock Contention
G5 – 414.38�>
G4 – 210.34

G5 – 5.20 Mlocks/sec, 4 threads
G4 – 2.64 Mlocks/sec, 4 threads

Memory Test
G5 – 347.29�>
G4 – 172.94

System
G5 – 391.04�>
G4 – 277.47

Allocate
G5 – 895.06�>
G4 – 858.19�>

G5 – 583.85 Kalloc/sec
G4 – 559.80 Kalloc/sec

Fill
G5 – 373.87�>
G4 – 333.68�>

G5 – 2975.98 MB/sec
G4 – 2656.07 MB/sec

Copy
G5 – 257.74
G4 – 150.38

G5 – 1288.69 MB/sec
G4 – 751.89 MB/sec

Stream
G5 – 312.34�>
G4 – 125.62

Copy
G5 – 263.69
G4 – 116.93

G5 – 1927.58 MB/sec [G5]
G4 – 854.73 MB/sec [altivec]

Scale
G5 – 273.07
G4 – 124.18

G5 – 2015.25 MB/sec [G5]
G4 – 916.43 MB/sec [altivec]

Add
G5 – 364.29�>
G4 – 122.32

G5 – 2331.46 MB/sec [G5]
G4 – 782.84 MB/sec [altivec]

Triad
G5 – 383.56�>
G4 – 141.62

G5 – 2343.54 MB/sec [G5]
G4 – 865.29 MB/sec [altivec]

Quartz Graphics Test
G5 – 304.16�>
G4 – 179.98

Line

G5 – 302.66�>
G4 – 166.18

G5 – 7.70 Klines/sec [50% alpha]
G4 – 4.23 Klines/sec [50% alpha]

Rectangle
G5 – 255.24
G4 – 134.88

G5 – 17.96 Krects/sec [50% alpha]
G4 – 9.49 Krects/sec [50% alpha]

Circle
G5 – 278.64
G4 – 163.24

G5 – 6.42 Kcircles/sec [50% alpha]
G4 – 3.76 Kcircles/sec [50% alpha]

Bezier
G5 – 276.87
G4 – 183.96

G5 – 3.01 Kbeziers/sec [50% alpha]
G4 – 2.00 Kbeziers/sec [50% alpha]

Text
G5 – 495.94�>
G4 – 358.63�>

G5 – 8.08 Kchars/sec
G4 – 5.85 Kchars/sec

OpenGL Graphics Test
G5 – 210.9
G4 – 132.29

Spinning Squares
G5 – 210.9
G4 – 132.29

G5 – 147.59 frames/sec
G4 – 92.58 frames/sec

User Interface Test
G5 – 367.28�>
G4 – 264.22

Elements
G5 – 367.28�>
G4 – 264.22

G5 – 118.13 refresh/sec
G4 – 84.99 refresh/sec

Disk Test
G5 – 109.43
G4 – 90.1

Sequential
G5 – 115.71
G4 – 107.45

Uncached Write
G5 – 143.18
G4 – 99.86

G5 – 59.68 MB/sec [4K blocks]
G4 – 41.63 MB/sec [4K blocks]

Uncached Write
G5 – 125.33
G4 – 100.12

G5 – 51.32 MB/sec [256K blocks]
G4 – 41.00 MB/sec [256K blocks]

Uncached Read
G5 – 85.24
G4 – 135.32

G5 – 13.49 MB/sec [4K blocks]
G4 – 21.42 MB/sec [4K blocks]

Uncached Read
G5 – 127.01
G4 – 101.67

G5 – 51.32 MB/sec [256K blocks]
G4 – 41.08 MB/sec [256K blocks]

Random
G5 – 103.79
G4 – 77.57

Uncached Write
G5 – 96.69
G4 – 49.49

G5 – 1.45 MB/sec [4K blocks]
G4 – 0.74 MB/sec [4K blocks]
Uncached Write

G5 – 101.85
G4 – 91.91

G5 – 22.97 MB/sec [256K blocks]
G4 – 20.73 MB/sec [256K blocks]

Uncached Read
G5 – 100.56
G4 – 92.88

G5 – 0.66 MB/sec [4K blocks]
G4 – 0.61 MB/sec [4K blocks]

Uncached Read
G5 – 118.57
G4 – 103

G5 – 24.40 MB/sec [256K blocks]
G4 – 21.20 MB/sec [256K blocks]

I also try the Fish Aquarium, but there the results were not diferent at all, but it’s not a suprise, I assume the video card here does most of the job, and the Ti4600 is in my view a better card than the Radeon 9600, I will redo this test once I get a better video card 😉

Resolution: 1024×768
G4 – 333fps
G5 – 350fps

no bubbles:

366fps identical for G4/G5

My person conclusion:
The G5 is a screamer when it comes to heavy tasks like rendering, but for most day to day apps, as of now (pre-tiger) there is just nothing that indicates much of a boost from the G4.