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weird motherboard/memory behaviour

post #1 of 3
Thread Starter 
hi all, hope someone can help. not sure if this belongs in the memory or motherboard forum, but i'll try here anyway.

i have an amd x2 3600+ windsor (F2), asus m2n-e, and 2gb ddr2 800 kingston valueram and have currently overclocked to 2400mhz (with ram set at 667 and stock c5 timings).

I experimented with the ram timings and set them to 6-6-6-18-2t and with the ram set to 800 in the bios it goes all the way up to 960mhz (with the cpu at the same 2400mhz), but set at 667 in the bios it stops at 813mhz. the max vdimm is 1.95v and that's what I've set it at (though it probably doesn't need all of it).

coincidentally (perhaps not) the ram stumbles at about 22% greater than whatever it is set at in the bios (800 --> 976, 667 --> 816, 533 --> 650).

I suppose the question is that if the ram can manage 960mhz when its set at 800 why can't it manage it when its set at 667 in the bios?

has anyone experienced this or can anyone provide some insight?

thanks
monty
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My System
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CPUMotherboardGraphicsRAM
AMD x2 3600+ EE (Windsor) Asus M2N-E Gigabyte 7300GT Turbo 2gb Kingston DDR2 800 
Hard DriveOptical DriveOSMonitor
Seagate 320gb SATA2, 500gb SATA2 Pioneer DVD+/-RW Windows XP Pro Samsung 940B 
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Antec 380W Antec SLK1650B 
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post #2 of 3
when you set it to 667, you are lowering the speed of the ram.

FSB overclock/stock speed * RAM frequency setting = should equal final RAM speed.
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Windows 7/ Windows XP Pro Performance Edition HANNspree HF229H 22" Dell AT101W SevenTeam ST-750ZAF 750W Modular 
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post #3 of 3
It's because when you change from 800 to 667 you're increasing the divider which lowers the RAM speed.
Read this guide, it's really good and explains memory speeds really well.
http://www.overclock.net/amd-memory/...explained.html
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:D
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2 x 1 TB + 500 GB ASUS DVD Antec Kuhler H20 620 Ubuntu Oneiric x64 / Win7 x64 Ultimate 
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