The e6750 is more than 60% more performance so can handle a better gpu. I think that puts it a bit too far for a fair comparison. Mid range same era is too low and would be like an 8600 gts even a 9600gt is lower than your contradiction 730. Gpu heavier games on even his weaker cpu could actually be fine on something more like a 650.
My e6400 is paired with a r7 240. Better cpu still but close. A lot of people upgraded to a 7750 back when it was the best 75w gpu. People are still upgrading to a 750ti on it but many go with a c2q with it as well.