Well if your willing to drop down so low to "just play the game" then that is your 'bar'. The 'consumer' (the people buying your hardware) are using the 'YouTube standard', which is to say they see a epic AAAA game (BF4, Alien Isolation, CODAW, etc.) shown at full AA, AF, 1080P ULTRA settings with FPS over 50s, they feel ALL computers should "PLAY" like that. your cards fail to even do half that level of 'Bells and whistles' graphically and certainly not high FPS (as the independent testing shows you in the links even on OLD titles).
Alternatively to your card, then the BETTER value for 'expectations' would be a PS4, which would be more expensive then your cards TRUE, but putting into 'any off the shelf' $249 computer the card won't help (in fact current articles are stating ADDING a low end card will actually IMPEDE performance on iCores due to the high performance of the built in Video) and the costs of both the low end computer PLUS your card (again what someone would be thinking of trying to do 'PC Gaming on the cheap') would again not provide the SAME or even 'close' level of performance as a PS4 can which is in the same price range, and you get much better performance (1080P 60FPS HIGH graphics on many NEW and current titles -
http://www.ign.com/wikis/xbox-one/PS4_vs._Xbox_One_Native_Resolutions_and_Framerates ).
That all said, simple SELF-POWERED solution, go to EBAY and look up your cards see how many are being sold and how much they are being sold for,
(give you a hint, ALOT of them and stupidly priced). Now consider anyone can just type www.pcpartpicker.com click on graphics cards, and get the current 'lowest end' GPU that is 2 Generations better then the cards your selling for $125 NEW AND UNDERWARRANTY (remember hardware is only warrantied for 3 years, after that the manufacturer clearly states they can't guarantee the hardware will every work)
http://pcpartpicker.com/part/evga-video-card-02gp43753kr