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2 x 450 Watt Power Supplies
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this could very well be the cause of your problem.as far as the pictures provided in CM Stacker reviews show the dual power connector has 20pins instead of 24.while it should be ok to boot but plugging a 20 pin PSU ATX connector to a 24pin ATX mainboard may show its weakness under heavy load.
try using only one strong 24 pin PSU and see what happens.