2 GPU Installed?

Hi I have just installed Zorin OS 16 in an old Intel i3 laptop which has AMD Radeon GPU.
when I run lshw I get 2 entries

lshw -c video  
       description: Display controller
       product: Sun PRO [Radeon HD 8570A/8570M]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:01:00.0
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: bus_master cap_list rom
       configuration: driver=radeon latency=0
       resources: irq:28 memory:d0000000-d7ffffff memory:d8600000-d863ffff ioport:3000(size=256) memory:d8640000-d865ffff
       description: VGA compatible controller
       product: 3rd Gen Core processor Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: vga_controller bus_master cap_list
       configuration: driver=i915 latency=0
       resources: irq:27 memory:d8000000-d83fffff memory:c0000000-cfffffff ioport:4000(size=64) memory:c0000-dffff
  • Which one is really used?
  • How can I check if the GPU is really used?
  • How do I enable the GPU acceleration of Zorin?

Both are used.

Thanks @Bourne
How do I know which one is used and when? Can they be used both at the same time for the same task?

AMD Graphics are included in the Linux Kernel and managed automatically.
I prefer the Nvidia setup that allows user control over use and management.

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