Is dual-channel memory important for an APU's integrated graphics?

Yes, you’ll see a noticeable boost. The A8-7600’s iGPU depends on memory bandwidth; single-channel forces the GPU and CPU to share one 64-bit lane, limiting performance. Adding a second stick gives 128-bit dual-channel bandwidth, boosting frame rates in games like CS:GO by 20-40%, taking you from “playable at low” to “smooth at medium.” Match the new stick’s speed and timings to the old one for best results.