400W power supply runs GTS450?

A system with a single GTS450 requires a 450W PSu with at least 25A on the 12V rails and one 75W 6-pin PCIe power connector. Total amperage on the 12V rail is more important than the wattage ratng of the PSU because the primary power draw in modern PCs is generated by the CPU/GPU on the 12V rails. The Highpower HPC-400-H12S 400W PSU has 25A on the 12V rails and one 6-pin PCie power connector; it is sufficient for an upgrade to a GTS 450.