GPU Upgrade Acer X3995?

HI,

I am looking to upgrade the GPU on this PC but I am unsure if the PSU will be able to support it. I am not looking to install a high end GPU only a low end card such as ASUS 2 GB AMD Radeon R7 240-2GD3-L PCIe. I am aware that the PSU has a max of 220w but I am unsure of the current load. Based on the basic system with no current upgrades are you able to advise me on this?

Basic specs are:

Windows 7 64 Bit
Intel Core i3 2120
6GB Ram
Intel HD Integrated Graphics
2 HD (1 SATA 1GB)
1 Optical Drive
Realtek HD Audio

If necessary I am able to disconnect 1 HD and the optical drive as they are not necessary, also to disable the onboard graphics if possible if this will help.