HP Pavilion P6000 series (p6715f)

Aug 18, 2019
This is a desktop. Not a laptop.
Here are the specifications I found:
Here is what CPU Z says about this computer:
*Intel Core i3 550 Processor @ 3.20 GHZ
*Socket 1156 LGA
Model 2A9C manufacturer MSI
American Megatrends Inc. 6.14 (11/05/2010)
Currently 3 2GB DDR3 ram cards which I plan to upgrade to 4 x4GB DDR3 Ram sticks to get 16GB.
Current graphics:
Intel HD Graphics (No graphic card)

I'm trying to figure out which is the best processor I can buy for this computer. I figure I can find it used for under $70. Other than this what is the best graphic card I could use on this computer with the original case it came with? I'm trying to learn some Photoshop and I will be doing memory intensive processing. So I need to improve this computer as much as I can as right now is crawling slow. I'm trying to find all the information I need but I'm confused. Would appreciate your help. Thanks!