My tests with 10.6 10A432.
Without GMA overclocking:
Xbench
Results 40.80
System Info
Xbench Version 1.3
System Version 10.6 (10A432)
Physical RAM 2048 MB
Model MacBookAir1,1
Drive Type ST980811AS ST980811AS
CPU Test 27.63
GCD Loop 45.84 2.42 Mops/sec
Floating Point Basic 16.61 394.69 Mflop/sec
vecLib FFT 23.88 787.92 Mflop/sec
Floating Point Library 47.92 8.34 Mops/sec
Thread Test 48.11
Computation 42.80 867.04 Kops/sec, 4 threads
Lock Contention 54.92 2.36 Mlocks/sec, 4 threads
Memory Test 76.23
System 66.69
Allocate 85.50 313.97 Kalloc/sec
Fill 85.51 4157.45 MB/sec
Copy 46.31 956.45 MB/sec
Stream 88.95
Copy 87.32 1803.64 MB/sec
Scale 85.93 1775.23 MB/sec
Add 100.89 2149.20 MB/sec
Triad 83.57 1787.79 MB/sec
Quartz Graphics Test 60.50
Line 52.99 3.53 Klines/sec [50% alpha]
Rectangle 54.10 16.15 Krects/sec [50% alpha]
Circle 47.76 3.89 Kcircles/sec [50% alpha]
Bezier 58.37 1.47 Kbeziers/sec [50% alpha]
Text 138.60 8.67 Kchars/sec
OpenGL Graphics Test 74.25
Spinning Squares 74.25 94.19 frames/sec
User Interface Test 26.89
Elements 26.89 123.42 refresh/sec
Disk Test 29.16
Sequential 61.02
Uncached Write 54.75 33.62 MB/sec [4K blocks]
Uncached Write 55.30 31.29 MB/sec [256K blocks]
Uncached Read 77.32 22.63 MB/sec [4K blocks]
Uncached Read 61.46 30.89 MB/sec [256K blocks]
Random 19.15
Uncached Write 6.07 0.64 MB/sec [4K blocks]
Uncached Write 58.18 18.63 MB/sec [256K blocks]
Uncached Read 66.07 0.47 MB/sec [4K blocks]
Uncached Read 84.40 15.66 MB/sec [256K blocks]
Geekbench
http://browse.geekbench.ca/geekbench2/view/158467
OpenGL Extension Viewer
And with GMA Overclocking
Xbench
Results 42.50
System Info
Xbench Version 1.3
System Version 10.6 (10A432)
Physical RAM 2048 MB
Model MacBookAir1,1
Drive Type ST980811AS ST980811AS
CPU Test 27.81
GCD Loop 47.20 2.49 Mops/sec
Floating Point Basic 17.12 406.72 Mflop/sec
vecLib FFT 22.96 757.40 Mflop/sec
Floating Point Library 48.35 8.42 Mops/sec
Thread Test 46.54
Computation 42.20 854.96 Kops/sec, 4 threads
Lock Contention 51.86 2.23 Mlocks/sec, 4 threads
Memory Test 76.88
System 67.60
Allocate 90.64 332.85 Kalloc/sec
Fill 85.47 4155.67 MB/sec
Copy 46.19 954.11 MB/sec
Stream 89.12
Copy 88.03 1818.27 MB/sec
Scale 86.13 1779.46 MB/sec
Add 100.90 2149.48 MB/sec
Triad 83.31 1782.20 MB/sec
Quartz Graphics Test 60.62
Line 52.95 3.53 Klines/sec [50% alpha]
Rectangle 53.98 16.12 Krects/sec [50% alpha]
Circle 47.81 3.90 Kcircles/sec [50% alpha]
Bezier 59.06 1.49 Kbeziers/sec [50% alpha]
Text 138.50 8.66 Kchars/sec
OpenGL Graphics Test 72.21
Spinning Squares 72.21 91.60 frames/sec
User Interface Test 26.82
Elements 26.82 123.11 refresh/sec
Disk Test 27.68
Sequential 62.43
Uncached Write 55.62 34.15 MB/sec [4K blocks]
Uncached Write 57.80 32.70 MB/sec [256K blocks]
Uncached Read 77.35 22.64 MB/sec [4K blocks]
Uncached Read 63.04 31.68 MB/sec [256K blocks]
Random 17.78
Uncached Write 5.55 0.59 MB/sec [4K blocks]
Uncached Write 57.49 18.41 MB/sec [256K blocks]
Uncached Read 65.19 0.46 MB/sec [4K blocks]
Uncached Read 83.32 15.46 MB/sec [256K blocks]
OpenGL Extensions Viewer
It seems that with SL and newest bios patched by alex_l, GMA is scalling ok by itself again very well.