Finally a new card I think I can use in my old rig! Sounds like my old 460W PSU can handle it.
http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-750-ti
http://www.digitaltrends.com/computing/nvidia-geforce-gtx-750-ti-huge-deal-heres/
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Most 400 - 500 watt PSU's work great in the normal rig - the brand names are fairly reliable, but some of the "white box" units may not be putting out the indicated wattage.
Nothing like a new video card to motivate a guy to get playing ! ;)
I think I will be getting one in the near future. Looks awesome.