Sadly,GPUs is not one of them as the chip is soldered to the logic board. One can upgrade in some cases the CPU as an example in your case putting in an i7 CPU and maybe upgrading the RAM, which sadly in this series has soldered RAM so your 8GB is all you have to work with.
+
Sadly, the GPUs is not one of them, as the chip is soldered to the logic board. One can upgrade in some cases the CPU as an example in your case putting in an i7 CPU and in other systems upgrading the RAM, which sadly in this series has soldered RAM so your stuck with 8GB to work with.
You might be able to find another 2015 board with an i7 and 16GB of RAM already installed which would make more sense. Still that doesn’t alter the GPU.
iMacs have limited upgrade possibilities!
Sadly,GPUs is not one of them as the chip is soldered to the logic board. One can upgrade in some cases the CPU as an example in your case putting in an i7 CPU and maybe upgrading the RAM, which sadly in this series has soldered RAM so your 8GB is all you have to work with.
You might be able to find another 2015 board with an i7 and 16GB of RAM already installed which would make more sense. Still that doesn’t alter the GPU.