The tests last about 10 - 15 minutes (I mean in total not individually, the whole thing should be finished in that period) and it doesn't generate a logfile per sae but you can see the results at the end (providing it completes the benchmarking) and there is a further details option that lets you see how your overall score was put together in more well.. detail (like FPS for individual tests and what your CPU and graphics scored seperately).
The ones at the start will run through quickly and they will indeed then run through again at FPS in single figures and with "jaggedy" graphics, that is because they are the CPU tests and software rendering has been near impossible (playable anyway) in modern games for quite some time (especially graphically intensive ones with engines like 3D Mark).
The screen shouldn't go black at any point in the tests (except perhaps very brief periods between them). I've seen it as a symptom of either the PSU or graphics card cutting out but if your getting corruption/sparklies then much less likely to be the PSU.
I'm guessing a friend installed the card for you, from what you said about the power connector so I don't suppose it would be possible for you to ask them to try the graphics card in his/her system?
The ones at the start will run through quickly and they will indeed then run through again at FPS in single figures and with "jaggedy" graphics, that is because they are the CPU tests and software rendering has been near impossible (playable anyway) in modern games for quite some time (especially graphically intensive ones with engines like 3D Mark).
The screen shouldn't go black at any point in the tests (except perhaps very brief periods between them). I've seen it as a symptom of either the PSU or graphics card cutting out but if your getting corruption/sparklies then much less likely to be the PSU.
I'm guessing a friend installed the card for you, from what you said about the power connector so I don't suppose it would be possible for you to ask them to try the graphics card in his/her system?

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Getting a decent PSU is never a bad investment though so if you have the cash to spare (£40 or so) could be worth giving it a go 