Hey,
To be clear, he did not specify if this is meant for GAMING or not.
If it's for gaming, then yes it's not a good card though it runs some slow and older games fine.
If it's NOT meant for gaming then the question is whether it does something for you that your current card (or iGPU) can't do.
Other:
Your iGPU does use some of your system memory as well. If you had it set to 1024MB for light gaming then you'd only have 3GB left of your 4GB to be used with Windows and applications.
What card?
For budget gaming I strongly suggest one of the new AMD cards. Either the RX-460 or RX-470 (RX-470 if possible).
**Price gouging is going on for these cards due to availability so if you can wait I suggest you wait another month or so for stock and pricing to stabilize.
RX-470 is about 87% the performance of the RX-480 so use this to compare:
https://www.techpowerup.com/reviews/AMD/RX_480/24.html