Gigabyte VT600 1394 freezes during 3D apps

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The computer locks up / freezes randomly throughout the benchmarks and I have to reset the computer - no error messages come up, it just hangs.
During normal Office and internet browsing, system hangs very rarely.

My configuration is as follows:
AMD Athlon 2400+ (Thorougbred) CoolerMaster heatsink
512MB Kingston RAM DDR 400 (1 stick only)
Gigabyte VT600 1394 Motherboard
Gigabyte Raedon 9250 128MB
Soundblaster Live
Wireless NIC
Antech trupower 550W power supply - no major voltage fluctuations
Thermaltake Xaser 3 case (6 fans excellent cooling)

I have tried the following:
Checked CPU temperature - it is between 40 to 50 Celcius
Run Memtest86 overnight - 18 passes over 8 hours with no errors
Checked for hardware conflicts - none
DIabled fastwrites in BIOS and winXP, and disabled non-essential onboard devices such as NIC, firewire and SATA.
I have put a Thermaltake Spirit fan on Northbridge and fan on passively cooled graphics card heatsink makes no difference
I have removed all cards except for graphics - no difference
Used latest VIA and ATI drivers (including Omega) - no difference
Clean installed Windows XP with only latest VIA and graphics drivers and run benchmarks - no difference
Also put in friends GForce2 graphics card with latest Nvidia drivers - no difference

My friends Intel based system with Nvidia 5200 video card and YumCha 500 Watt power supply runs through benchmarks without any sweat. This is driving me insane. Do I have a bad mobo - can anyone please help???
 
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