One 8GB 2666MHz stick versus two 8GB 2400MHz sticks is a trade-off between speed and capacity.
One 8GB 2666MHz stick versus two 8GB 2400MHz sticks is a trade-off between speed and capacity.
This might be due to your GPU only utilizing half its capacity because you're running a system with limited resources.
Comparing performance between an iGPU and a dGPU isn't straightforward. The iGPU accesses memory directly and shares bandwidth with the CPU, whereas a dedicated GPU has its own RAM. System-wide performance can become a limiting factor, especially due to RAM speed. I think dual-channel at 2400 MHz is preferable over single-channel at 2666 MHz, because dual channels double the bandwidth. If you already have an 8 GB stick, using two channels could increase it to 16 GB instead of 8, which might also improve things.