Both CX600 and CX600M have 2 x 6+2-Pin.
CX600 New egg
CX600M New egg
edit: the 75 watt PCI-E is the 6pin. These PSU's have 2 x 6+2, which means you can choose to use the extra 2pins or not. In your case you don't need. But you can even power better GPUs.
So they can easily power your GPU.