Tyan Computer GX21 - Manual (Page 30)

2.3 Installing Motherboard Components
22 Chapter 2: Setting Up
4. Insert the memory module into the slot as shown.
When inserted properly, the memory slot locking levers lock
onto the indentations at the ends of the module.
2.3.4 Installing a PCI Card
Follow these instructions to install a PCI card.
1. Remove the pre-installed PCI retention bar
PCI riser card