G.SKILL 8GB DDR3 Laptop Memory On A Linux Ultrabook

Only the memory intensive CPU benchmarks are impacted negatively by the memory upgrade.

There you have it for some memory benchmarks of the G.SKILL Ripjaws 8GB DDR3 SO-DIMM but more specifically focusing on the memory impact if upgrading the system memory in the ASUS Zenbook Prime with having the 2GB DDR3 RAM being soldered onto the motherboard and unfortunately limiting the dual-channel performance capabilities. When upgrading the system memory for your ASUS ultrabook (or other ultrabooks in a similar situation) it's important to weigh the memory bandwidth versus memory capacity requirements for your particular workload.

You can look at these Linux memory test results in more detail via the 1312098-SO-ASUSRAMME74 result file.