Got it! Here's a strong ad example focused only on selling the RAM:

FOR SALE: 8GB DDR4 RAM – 2133MHz

Upgrade your system with a reliable and high-performance memory module!

Details:

Brand: Gskill

Capacity: 8GB

Type: DDR4

Speed: 2133MHz

Condition: Gently used, fully tested and working perfectly

Ideal for:

Desktop PC upgrades

Smooth multitasking and faster load times

Location: Bangalore Bannerghatta Road

First come, first served – grab it before it’s too late