Disabling integrated graphics should have a series of benefits for your CPU and overall system performance. The thing is you need to have a dedicated graphics card in order to be able to keep using your computer.
Reasons why that's so:
1.disabled integrated GPUs should lower CPU temperature, making your CPU fan more silent.
2.The immediate benefit, if you happen to switch from actually USING integrated graphics (iGPU) to using dedicated GPU is a serious performance increase.
3.Integrated GPUs usually need system RAM to function, thus using it will lower your RAM with as much as the computer allocates to the integrated GPU in the system BIOS. More RAM available does not translate into better performance unless you put that RAM to use (if you were at the point of nearly running out of RAM before and your system would have to swap data to the much slower hard disk drive, now under the same conditions the system should be faster without the iGPU enabled)
If you plan on upgrading the GPU (or switching from the integrated one to a dedicated one, you should take into consideration the space inside your case, your PSU and your actual requirements graphics-wise because obviously not everyone needs a $1000+ GPU)