I learned to run Knabench

....but received a very very strange results:
WinXP 32. testWU-1 - testWU-7
C2D E6600 (2.4GHz), default-515.exe, one core in knabench vs 8800GTS 320Mb and last sahcuda.exe
1 - all 7 results - DIFFERENT!
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2 - 8800GTS slower than
one core E6600!!!

This is as it should be?
Quick timetable
WU : testWU-1.wu
default-515.exe : 304 seconds
sahcuda.exe : 499 seconds
Speedup: -64.14%, Ratio: 0.61 x
WU : testWU-2.wu
default-515.exe : 496 seconds
sahcuda.exe : 590 seconds
Speedup: -18.95%, Ratio: 0.84 x
WU : testWU-3.wu
default-515.exe : 541 seconds
sahcuda.exe : 657 seconds
Speedup: -21.44%, Ratio: 0.82 x
WU : testWU-4.wu
default-515.exe : 125 seconds
sahcuda.exe : 123 seconds
Speedup: 1.60%, Ratio: 1.02 x
WU : testWU-5.wu
default-515.exe : 499 seconds
sahcuda.exe : 596 seconds
Speedup: -19.44%, Ratio: 0.84 x
WU : testWU-6.wu
default-515.exe : 823 seconds
sahcuda.exe : 943 seconds
Speedup: -14.58%, Ratio: 0.87 x
WU : testWU-7.wu
default-515.exe : 361 seconds
sahcuda.exe : 376 seconds
Speedup: -4.16%, Ratio: 0.96 x