User manual ABIT KD7A

[. . . ] 1. 00 Copyright and Warranty Notice The information in this document is subject to change without notice and does not represent a commitment on part of the vendor, who assumes no liability or responsibility for any errors that may appear in this manual. No warranty or representation, either expressed or implied, is made with respect to the quality, accuracy or fitness for any particular part of this document. In no event shall the manufacturer be liable for direct, indirect, special, incidental or consequential damages arising from any defect or error in this manual or product. Product names appearing in this manual are for identification purpose only and trademarks and product names or brand names appearing in this document are the property of their respective owners. [. . . ] Leave this item to its default [Non-OS2] setting for operating system other than OS/2. KD7A BIOS Setup 3-9 Report No FDD For OS: When set to [Enabled], this item allows you to run some older operating system without floppy disk drive. Delay IDE Initial (Secs): This item allows the BIOS to support some old or special IDE devices by prolonging this delay time. A larger value will give more delay time to the device for which to initialize and to prepare for activation. Disable Unuse DIMM/PCI Clk: This option disables the clock of DIMM/PCI slot that is not in use. [Yes]: The system automatically detect the unused DIMM and PCI slots, and stop sending clock signal to these unused PCI slots. NOTE: Set this option to [No] setting if there are adapters that cannot be automatically detected by the system and will cause malfunction. User's Manual 3-10 Chapter 3 3-4. Advanced Chipset Features DRAM Clock/Drive Control: Click <Enter> key to enter its submenu: Current FSB Frequency: This item will show you the current system front side bus speed. Current DRAM Frequency: This item will show you the current DRAM bus speed. The system may be unstable or unable to boot up if your DRAM module does not support the clock you set. When set to [By SPD], the BIOS will read the DRAM module SPD data and automatically set the DRAM clock by the value stored in it. NOTE: This item will be unchangeable at 333MHz FSB. KD7A BIOS Setup 3-11 DRAM Timing Selectable: Four options are available: Manual By SPD Turbo Ultra. When set to "By SPD", the BIOS will read the DRAM module SPD data and automatically set to the values stored in it. If you set to "Manual", the following five items will be available to let you make adjustments. You can select SDRAM CAS (Column Address Strobe) latency time according your SDRAM specification. Depending on your SDRAM module structure, the 4-Way setting can offer the best performance. If you choose the wrong setting, the computer system will not run in a stable manner. For detailed information on your SDRAM module, please ask your SDRAM module manufacturer. Precharge to Active (Trp): Trip timing value (Precharge time ­ time from precharge command to when back can be activated). Active to Precharge (Tras): Tras timing value = Minimum bank active time from activate to precharge of same bank. Active to CMD (Trcd): Trcd timing value = RAS to CAS latency + rd/wr command delay DRAM Burst Length DDR SDRAM modules provide a Burst mode that means an auto precharge function for programmable READ or WRITE burst lengths of 4 or 8 locations. This means that if we set burst length to 8, the address bus will acesss 8 bytes each cycle to precharge, etc. DRAM Command Rate: Two options are available: 2T Command or 1T Command. [. . . ] After all, your reseller regards you as an important customer who may purchase more products and who can urge your friends to buy from him or her as well. They should know best what your system configuration is and your problem. If you feel that you need to contact ABIT directly you can send email to the ABIT technical support department. First, please contact the support team for the branch office closest to you. [. . . ]