I got stutters when i switched to dx10_1, but no blue lines then.
Back to dx10_0 -> stutters gone, blue lines back.
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Win 7/64 Ult.; Phenom II X6 1100T; ASUS Crosshair IV; 16 GB DDR3/1600 Corsair; ASUS EAH6950/2GB; Logitech G940 & the usual suspects

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