Acer Aspire X3990 Acer Aspire X3990 Desktop Service Guide - Page 16

Memory Combinations Slot Memory Total Memory Slot 1 1GB,2GB,4GB 1G ~4GB Slot 2 1GB,2GB,4GB 1G ~4GB Maximum System Memory Supported 1G~8GB System Memory Item Specification Memory slot number 2 slot Support Memory size per socket 1GB/2GB/4GB Support memory type DDRIII Support memory interface DDRIII 1066/1333MHz Support memory voltage 1.5V Support memory module package 240-pin DDRIII Support to parity check feature Yes Support to error correction code (ECC) feature No Memory module combinations You can install memory modules in any combination as long as they match the above specifications. SATA Interface Item SATA controller Number of SATA channel Support mode Specification Intel H61 SATA X 2 HDD : Support RAID 0/1/5/10 Blue Ray ODD AHCI/RAID mode supported for internal SATA port USB Port Item Universal HCI USB Class USB Connectors Quantity 8 Specification USB 2.0/1.1 Support legacy keyboard for legacy mode • Supports at least 10 USB ports on both front and rear side. • At least 6 USB ports located on rear panel and others located on front bezel and top bezel. • All USB ports must be boot-capable includes USB-ODD, USB-HDD, USB-FDD, and etc... • All USB ports must be 2.0 certified. • All USB ports must provide the over current protection. • Support USB QTY is vary by different chassis(W/CR USB 2 ports) Chapter 1