Budget for the upgrade?

Budget for the upgrade?

I checked the link you posted and looked for PSU info and it says "Maximum Power Supply Wattage 250 W", can you please open your case and check the PSU model?

If you don't know what is the model, you can snap a photo of the PSU and post here.

But OEM PC normally comes with low grade PSU which cannot support mid/high end GPU, so you might need to change PSU if it is not compatible with the upgrade.

And about the fan noise, probably the stock cooler is crying already 

Include monitor?
Alright, if you can, clean up the cooler, if you never clean it before, watch tutorial video on Youtube.

For 1K budget, you can fit these,

1. Another 4GB RAM - RM 125
2. Zotac GTX950 Single Fan - RM 699
3. FSP Hexa+ 550W PSU - RM 189

I googled the model of your PSU, seems like it is a 300W PSU, so PSU is recommended to change as well to run new GPU.

If you can spare another RM 100, go for Gainward GTX960 Reference (RM 799). CPU bottleneck might be possible but that's the solution for now, upgrade CPU next time when you have more money.

To solve the noise issue, get a new CPU cooler, no need to change entirely.

If you want to change CPU, yes you need to change mobo also.

CPU is your current i5 650, if you want to change whole CPU, you cannot reuse it. Maybe you don't understand the definition of CPU, CPU is the processor, some people misinterpret it as the whole rig.

So rethink again and let me know what is your next plan, either to keep using the CPU or change it.