you can oc/volt them. drivers seem to possibly be the cause. also no card has fried at stock volts that i am aware of. the 37 second video that was referred to earlier was with 1.2v and not stock volts.
it just came out today. 11.4 drivers really awaken the 6990. give the same chance to the 590.
microwave generation......i swear.
edit: update on the 590 that blew
Were the temps shown right before it blew? If they fried it because they disregarded the temps than its their own fault.