the best graphics card on a 350 watt psu

The typical HP or Dell PC with a 350w PSU will be able to handle a Radeon HD 7790 which at stock speed uses 78w peak power, or a GTX 650 Ti at stock speed uses 74w peak power.

http://www.techpowerup.com/reviews/Sapphire/HD_7790_Dual-X/24.html

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In terms of overall performance, the Radeon HD 7790 edges out the GTX 650 Ti. However, you should look at the individual games benchmarked as well.

http://www.techpowerup.com/reviews/Sapphire/HD_7790_Dual-X/26.html

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