Despite the compatibility checker claiming this wouldn't work in my Dell Inspiron 580 desktop (Core i3 540 3GHz), and Dell themselves claiming the desktop has a maximum of 8GB RAM, I found reports online that it works up to 16GB RAM so I took a chance with this RAM and guess what? IT WORKS! The system originally came with 4 1GB sticks, so I removed the pair in Slot 1 and Slot 3 and installed these. Now I have 10GB RAM! (4 + 4 + 2 + 2). System is working perfectly for the last week and gave good results in PassMark PerformanceTest 7.0. VERY cool black anodized aluminum heat sinks on this DRAM.. Very nice quality at a rock bottom price! You'd be a fool to buy anything less.