Alienware 15 R3 and Aspire A515-51G-32MX share specifications such as Display Size (15.6 inch), Display Resolution (1920 x 1080), Launch Year (2017 year), Form Factor (Clamshell).
The main differences: Processor Model (Alienware 15 R3: Intel Core i5-7300HQ, Aspire A515-51G-32MX: Intel Core i3 7130U 2.7GHz); GPU Model (Alienware 15 R3: NVIDIA GeForce GTX 1060, Aspire A515-51G-32MX: Nvidia GeForce MX130); Installed Memory (Alienware 15 R3: 16 GB, Aspire A515-51G-32MX: 4 GB); Storage Capacity (Alienware 15 R3: 128 GB, Aspire A515-51G-32MX: 1000 GB).
Alienware 15 R3 may suit users who need its differing values, while Aspire A515-51G-32MX benefits those who need its paired strengths. Review the specs table above before deciding.