Help selecting a GPU for a specific MOBO

[Mittron]

I need to find a GPU to upgrade my PC a little bit and also so it fits the components i already have.

MOBO: Gigabyte 78LMT-USB3
CPU: AMD FX 6300
PSU: 500W
my current GPU is gtx 750 ti

The case dimensions are: 23.11 x 39.88 x 45.21 cm
and i got a 6 pin pcie cable if that matters.

 

[norcalsc]

MSI GTX 1050ti LP would be the smallest card I know of that would be a real upgrade. NO extra PCIE cable needed for most of them