What you are seeing is correct.
what you have is a low spec entry level computer.
the i3 7th gen 7100 chip has nothing to do with the low spec graphics card memory use.
you have 4GB (unless you chose the 16GB option) of RAM
of which 256mb is being used by the graphics.
Due to its lack of dedicated graphics memory or eDRAM cache,
the HD 630 has to access the main memory.
the specs of the Dell Vostro 3268 is
Hard Drive
500GB (7200RPM) 3.5inch SATA Hard Drive
Memory1
4GB (1X4GB) 2400Mhz DDR4 Memory
Video Card
Integrated Graphics included
Optical Drive
Tray load DVD Drive (Reads and Writes to DVD/CD)
Ports
Front IO Ports:
2 USB 2.0
1 Universal Audio Jack
Rear IO Ports:
2 USB 3.0
2 USB 2.0
1 Gigabit Ethernet
1 HDMI
1 VGA
1 3-stack audio jacks supporting 5.1 surround sound
1 DC in
Slots
Power Supply Unit: 65W adapter for UMA
Wireless
Dell Wireless™ 1707 Card (802.11BGN + Bluetooth 4.0, 2.4 GHz
updates to drivers are to fix specific problems in certain machines.
never install a fresh updated driver just because someone tells you to,
neither should you if a piece of software such as a driver updater tells you to.
if your computer requires an update to a driver, it will be found at
the computer manufacturers website.
if it is not broke then do not try to fix it.
the computer has been built to use the drivers it came with.
.