4 GB will be enough for both Dolphin and LoL (I also play that one, it´s pretty good). He´ll need a better CPU for Dolphin (like i3-4130*, i5-4670K* if with high budget).
Yes, it matters if it´s 128 or 256 (it´s related to GPU bandwidth if I remember well). Don´t know about the other one, but I do know that higher GBps bandwidth = more chances for higher IR for little to no drops.
*Those are the recommended CPUs I got from mind right now, there are more CPUs that are also good for Dolphin and, well, I don´t remember them right now.
Yes, it matters if it´s 128 or 256 (it´s related to GPU bandwidth if I remember well). Don´t know about the other one, but I do know that higher GBps bandwidth = more chances for higher IR for little to no drops.
*Those are the recommended CPUs I got from mind right now, there are more CPUs that are also good for Dolphin and, well, I don´t remember them right now.
Rig 1: Windows 10 Home | AMD A6-1450 @ 600/1000/1400 MHz | AMD Radeon HD Graphics 8250 | 4GB RAM | HP Pavilion TouchSmart 11.
Rig 2: Windows 10 Pro | Intel Core i7-2640M @ 780/2800/3500 MHz | Intel HD 3000 Mobile | 8GB RAM | Dell Latitude 6320.