Asus Z97-PRO GAMER User Guide - Page 18

• You may install varying memory sizes in Channel A and Channel B. The system maps the total size of the lower-sized channel for the dual-channel configuration. Any excess memory from the higher-sized channel is then mapped for single-channel operation. • Always install DIMMs with the same CAS latency. For optimal compatibility, we recommend that you install memory modules of the same version or date code (D/C) from the same vendor. Check with the retailer to get the correct memory modules. • Due to the memory address limitation on 32-bit Windows® OS, when you install 4GB or more memory on the motherboard, the actual usable memory for the OS can be about 3GB or less. For effective use of memory, we recommend that you do any of the following: - Use a maximum of 3 GB system memory if you are using a 32-bit Windows® OS. - Install a 64-bit Windows® OS if you want to install 4GB or more on the motherboard. - For more details, refer to the Microsoft® support site at http://support.microsoft. com/kb/929605/en-us. • This motherboard does not support DIMMs made up of 512 Mb (64 MB) chips or less. • The default memory operation frequency is dependent on its Serial Presence Detect (SPD), which is the standard way of accessing information from a memory module. Under the default state, some memory modules for overclocking may operate at a lower frequency than the vendor-marked value. To operate at the vendor-marked or at a higher frequency, refer to section 2.5 Ai Tweaker menu for manual memory frequency adjustment. • Memory modules with memory frequency higher than 2133MHz and their corresponding timing or the loaded XMP profile is not the JEDEC memory standard. The stability and compatibility of the memory modules depend on the CPU's capabilities and other installed devices. • For system stability, use a more efficient memory cooling system to support a full memory load (4 DIMMs). Z97-PRO GAMER motherboard memory Qualified Vendors Lists (QVL) DDR3 3200 (O.C.) MHz capability Vendors Part No. Size SS/DS Chip Brand AVEXIR AVD3UH32001304G-4CI(XMP) 16GB (4x4GB) SS - G.SKILL F3-3200C12Q-16GTXDG(XMP) 16GB (4x4GB) SS - Chip NO. - Timing Voltage DIMM socket support (Optional) 2 DIMMs 4 DIMMs 13-15-15-35 1.65V • • 12-15-15-35 1.65V • • DDR3 3100 (O.C.) MHz capability Vendors Part No. Size SS/DS Chip Brand Chip NO. AVEXIR AVD3UH31001204G-4CI(XMP) 16GB (4x4GB) SS - - A-DATA AX3U3100W4G12-DMV(XMP) 8GB (2x4GB) SS - - Timing 12-14-14-35 12-14-14-36 Voltage 1.65V 1.65V DIMM socket support (Optional) 2 DIMMs 4 DIMMs • • • • 1-8 Chapter 1: Product introduction