1. No, if i had, i wouldn't use an adapter but i'd rather just get a cable.
2. My port is dvi-i i THINK, but on the gpu port itself, there was a plus is the area surrounded by 4 pins on the left, while the adapter had a minus instead. I told myself it didn't matter and i moved on.
3.Tried both ports already.
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Specs:
400w psu red... something, forgot the brand name.
1gb ddr 800 ram
Intel core 2 duo e7200 2.53 ghz
Sapphire radeon hd 4670 512mb
Forgot the motherboard, and i'm not home eight now
If it's very important though, i'll look it up.
Cheers