After two week test error is IN MOTHERBOARD. Test other memory, network cards, power supply... Some kernels versions work normally one-two days and report error randomly, some kernels randomly hangs in one-two days, some kernel hang is in five minuts... After change motherboard, no errors, no hangs. Sorry for bad error... error is closed -- Г‘ óâà æåГГЁГҐГ¬, Petr mailto:unicorp99@hotbox.ru