1) nVidia is just the CHIPSET. Gigabyte is just the MANUFACTURER that USES nVidia's chipset. The manufacturer of that motherboard is XFX.
2) Go with XFX of EVGA for best warranty/customer support...
3) The PSU can supply how many number of amps/watts it can. Overload = restart or crash. Get a bigger PSU. OCZ 700W.
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Core 2 Duo E2140 1.6GHz @ 3.04GHz
GA-P31-DS3L
pqi Turbo CL4 DDR2-800 2GB
Sapphire HD3850 256MB
Sony Writemaster DVD Burner EIDE
Seagate Barracuda 80GB 7200.9 8MB SATII
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