Looking to buy a r9 290x but only have a 600w psu. Uprgrading my pus is not really an otpion. So can I buy this card and run it in my system, which is i5-4690k, 16gb, msi guard-pro (friendly to overclocking) and a full size atx case?
The Corsair "CX" is made with some inferior Samxon capacitors that cannot take heat. The short answer is therefor "Yes, but it won't last." If it is a bottom-mounted PSU getting its own air, and not muffled into a carpet, it should stay cooler. If it is top mounted, or doesn't get good airflow, it will probably give out in 6 months to a year.
The Corsair "CX" is made with some inferior Samxon capacitors that cannot take heat. The short answer is therefor "Yes, but it won't last." If it is a bottom-mounted PSU getting its own air, and not muffled into a carpet, it should stay cooler. If it is top mounted, or doesn't get good airflow, it will probably give out in 6 months to a year.
The single vs. multiple +12V rail is meaningless. Long ago before PSU manufacturers figured out how to do OCP properly, it is possible that power might be "trapped" on an underutilized rail; this was a Corsair marketing point.
Modern PSUs don't have this issue. In fact, a single-rail PSU can experience a near-short that would shut down a multi-rail PSU, but instead will smoke wires in the single-rail unit.