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Why is my 1800MHZ ram sticks running at 666MHZ?

by noora4 / May 10, 2008 6:23 AM PDT

I just finished building my PC and managed to boot Vista up, but when I check my Ram in the NVIDIA Control Panel it says that they are running at 666MHZ when I purchsed 1800MHZ Ram. How would I get it to 1800MHZ?

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Try...
by R. Proffitt Forum moderator / May 10, 2008 6:28 AM PDT

Completing your post with the make, model and maybe a link to this motherboard's home page.

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Couldn't find the manual.
by R. Proffitt Forum moderator / May 10, 2008 7:12 AM PDT
In reply to: Specs
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Speed it up.
by R. Proffitt Forum moderator / May 10, 2008 7:32 AM PDT
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Simple
by At The Opera / May 10, 2008 7:12 AM PDT

The RAM operates at roughly 666MHz, but can send/receive data on the up and down cycle, so it's an EFFECTIVE speed of around 1800MHz when you add in the correct multiplier.

This is how DDR RAM worked way back when. Your DDR 400 RAM is really only running at 200MHz, but since it can transfer data twice in one clock cycle, it's marketed as 400MHz.

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(NT) And what RAM exactly did you purchase?
by Kees Bakker / May 10, 2008 7:14 AM PDT
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Manual
by noora4 / May 10, 2008 7:24 AM PDT

The product code for the motherboard is MB-N790-IUL9.

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you just need to manually configure the RAM in your BIOS
by ramarc / May 11, 2008 2:22 AM PDT

Select the Advanced Chipset Features in the BIOS menu.
Change FSB - Memory Clock Mode to Unlinked
Set MEM (DDR), Mhz to 1800 or 1866.
You'll also probably need to edit Memory Timing Setting to match the RAM's rated specs of 8-8-8-24.

Why was it underclocked? The mobo probably chose the safest setting from the memory's SPD. High-performance memory usually needs to be configured manually to reach it's rated performance.

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