Sorry but I don't think that's good enough to expect what you would or could expect from a 750.
You didn't give exact numbers for framerates in any game so all I can do is nod. Yup, that's pretty low end. I don't expect much from A4 powered machines.
So basically, I bought a new graphics card and it was working amazingly, until my motherboard crashed, I ended up replacing the PSU, Motherboard and the Processor
I can't remember much about what it was like before but here's what I do know
Graphics card is a Nvidia GeForce GTX 750 ti
The processor I had in before was a 3.8 Ghz, and the current one is an AMD A4-6300 APU Radeon(TM) HD Graphics (2 CPUs) 3.7 Ghz, so I'm guessing they were pretty similar, as far as I know the motherboard I have in now wouldn't really effect my graphics card performance unless I'm wrong, but the motherboard is a Gigabyre F2A88XM-D3H Ultra Performance (taking that straight from the box, lol)
Now as for the power supply, originally there was a Turbolink ATX-TL500W-BK (500W, 12V) and I replaced it for a Coolmaster 500W power supply, I don't see how my graphics card would perform better with that 450W power supply, i'm completely out of the loop on this and I don't know what to do, Christmas is coming up and I can order some upgrades to fix this issue but I'd like to know why exactly my graphics card isn't performing like it was before, help me pleaseeee