THIS POST APPLICABLE TO MT (MINI TOWER) FORM FACTOR ONLY.
Unfortunately no card that is more than 7.5 inches long or 2 slots wide will PHYSICALLY FIT inside the case - it was found that only single bracket video card can fit due to BTX MOBO, where card internals facing upward towards PC internals, not ATX, where dual card design is blocking another PCI slot by facing downward.
If you prefer the card with beefier fan, then the length of the card must not exceed 7.5 inches, otherwise only "skinny" single bracket, single slot cards can physically fit.
Pictures below will prove my point.
View shows no room for dual bracket
Single bracket only, or you have to cut dual bracket in half
This is the other way to show my point
Here you can clearly see only single place for the bracket
Visual explanation
7.5 inches explained, also shown "obstacles"
This is the picture of actual "skinny" single slot video card (not sure which model)- perfect, "glove" fit.
Those are 2 old cards which will fit, however they are about to be phase out
Skinny, flimsier in terms of construction, completely single slot XFX 7750
http://www.amazon.com/XFX-DisplayPort-PCI-Express-FX775AZNP4-FX-775A-ZNP4/dp/B007Z3T5JC
A bit beefier cooler, not as skinny, more durable in construction PowerColor AX7750
http://www.amazon.com/PowerColor-AX7750-1GBD5-DH-Video-Graphics/dp/B00775OC28/ref=sr_1_1?ie=UTF8&qid=1362783129&sr=8-1&keywords=AX7750+1GBD5-DH
However I see that you tried to use GTX650, so I found GTX 750 which must fit according to above guide
ASUS GTX750-PHOC-1GD5 GeForce GTX 750 1GB GDDR5
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121854
Complete specs are found here
https://www.asus.com/us/Graphics_Cards/GTX750PHOC1GD5/#specifications
Dimensions 7.28 " x 4.53 " x 1.41 " Inch
It doesn't say anything about power supply, so you should be fine.
Anything else I can help you with?
If you indeed will purchase and install this card, please come back and report your story, so others can benefit as well.