GPU Acceleration

I have recently bought a transition pack for my videos, when i place the transition over the footage i get a banner with "This effect needs GPU acceleration". I have tried changing my settings to OPENCL Acceleration to see if it would work, it does not. My Mac does not have a nvidia graphics card, so it does not support CUDA.

My Macbook Pro only has 8gb Ram, would i need to buy an eGPU to help boost the ram so that my mac can handle effects like these? Or is there anything else i can try before this. 

Any help is appreciated, thank you.