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KV8-MX - How to set memory timing
Cant find it. Using DDR 400, but unstable. Want to try 300.
Cant find it in manual or actual bios. TIA |
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KV8-MX - How to set memory timing
In article , Shadow sh@dow wrote:
Cant find it. Using DDR 400, but unstable. Want to try 300. Cant find it in manual or actual bios. TIA Have you tried "Memclock Mode" set to [Manual] ? The user manual claims more settings will be exposed if you try that setting, but there are no pictures of the new settings you will see. Paul |
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KV8-MX - How to set memory timing
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KV8-MX - How to set memory timing
In article , Shadow sh@dow wrote:
On Tue, 21 Mar 2006 03:11:01 GMT, (Paul) wrote: In article , Shadow sh@dow wrote: Cant find it. Using DDR 400, but unstable. Want to try 300. Cant find it in manual or actual bios. TIA Have you tried "Memclock Mode" set to [Manual] ? The user manual claims more settings will be exposed if you try that setting, but there are no pictures of the new settings you will see. Paul Thanks, the option was grayed out and I assumed it could not be changed. My memory is Kingston 3200 Any idea what the best settings might be ? The bios had defaulted to 200Mz bus I changed that to 400Mz (2:1), and I must confess, no difference felt at all. TIA Get a copy of CPUZ ( www.cpuid.com/cpuz.php ) and verify the resulting settings. The "CPU" panel shows you the clock fed to the CPU (200.9MHz in this example). http://www.xtremenews.net/datos/arti...0+-2-2-2-5.jpg In the "Memory" panel, the frequency shown is the one fed to the RAM. The frequency is made, by dividing the core clock by the memory divider (shown on the next line of the panel as "CPU/11" in this example). The memory clock is 200.9MHz, which is DDR402. If the person running this motherboard had selected a lower value in the BIOS, this clock would be different than the one feeding the CPU. http://www.xtremenews.net/datos/arti...0+-2-2-2-5.jpg This is an example of an overclocked memory. The clock here is 280.9MHz, which is DDR562, and is very high by conventional standards. http://www.xtremenews.net/datos/arti...c2-a8n-MEM.jpg The parameters that have the most effect on the memory bandwidth, are the memory frequency and the Command Rate setting. From lowest performance to highest performance, they would be DDR333 Command Rate 2T DDR333 Command Rate 1T DDR400 Command Rate 2T DDR400 Command Rate 1T (fastest) Which setting is appropriate, depends on how many sticks of RAM are installed in the motherboard, and which slots they are in. Your manual is missing the normal "Table 1", but you can see the recommended settings on page 21 of this manual: http://www.asus.com/pub/ASUS/mb/sock.../e1721_k8n.pdf The memory operation is a function of the CPU and not the chipset, and that is why the Table 1 of the K8N manual can be applied to the operation of your motherboard. AMD also makes a technical document available, which they have updated a number of times. Table 42 on PDF page 175 contains the same information as in the Asus manual Table 1. The two columns on the right, show the maximum memory rate, when the Command Rate is set to 1T (command per clock) or 2T (command per every two clocks). If you are using two sticks of RAM, they should go in slot 1 and slot 3. AMD says two sticks are only capable of DDR333, but you can try a higher setting than that. http://www.amd.com/us-en/assets/cont...docs/26094.PDF When you adjust the memory subsystem, and especially if the memory is being overclocked, you should test the memory with memtest86+ from http://www.memtest.org . It is important to boot with the memtest86+ floppy first, and test the memory, because if you just boot into Windows, your Windows install could be corrupted. So be careful with your memory experiments. HTH, Paul |
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KV8-MX - How to set memory timing
On Tue, 21 Mar 2006 22:37:26 -0300, in alt.comp.periphs.mainboard.asus
you wrote: On Tue, 21 Mar 2006 03:11:01 GMT, (Paul) wrote: (about mem settings in K8V-MX board) Great post, maybe a bit over my head, as I could not find the "command" option in the bios settings, but I managed to set the MB to DDR 400 (it defaults to DDR 200). I was getting the hypertransport thingy mixed up with the memory bus speed. I tried searching google, but only found out of date bios-setting tutorials. TNXs for the post -- NewsGuy.Com 30Gb $9.95 Carry Forward and On Demand Bandwidth |
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