Crashing if i stop mining, if using all GPUs + all core time consumed

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I'm running Win7 64Bit.

I just acquired for testing 2xHD6770. Not running crossfire, running a monitor on both cards.

If i start 2 miners, it will result in crash if i stop either one. If using Guiminers crash may occur already when starting.

When i quit a miner, things continue seemingly to work for 10seconds or so, and then halts. If i wait long enough system finally reboots.
Using drivers + catalyst from couple months back. Happens also on stock clock.

Also, why do they consume all power of a core? :O I got quite powerfull CPU (Best of old Core series, QX9770 @ 3.4Ghz) so that strikes quite odd as well

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[fsasa70]

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This also happens to me when I was using guiminer in the past. Use the command line alternative rather than the gui because that fixed my problems.

Set it to one core cpu affinity, so it doesn't consume all your cpu usage.

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This also happens to me when I was using guiminer in the past. Use the command line alternative rather than the gui because that fixed my problems.

Set it to one core cpu affinity, so it doesn't consume all your cpu usage.

This happens with Phoenix commandline too...