Why Does My Ram lower its Frequency

Kingston 2gb pc6400 ddr2 dimm dual chann...
December 29, 2010 at 09:19:24
Specs: Windows XP, pentuim D 2.80ghz
I Just bought a Kingston 2GB PC6400 800mhz ddr2 and mix it with my previous Ram
Transcend 1GB PC6400 800mhz ddr2, When i installed it both together my Ram Frequency lowers to 667mhz as seen on the Boot screen..
Why Does this happening?

When i check my system on CPU-z my two rams indicates that they have the same max bandwidth but differnt in Timming table

here's a Screen shot of my Ram in CPU-z


My Computer Specification is
Pentium D 2.80ghz
Asus P5KPL-AM SE - my Motherboard only has 2 memory Slot. can support up to 4gb ram
Ino3d geforce GT430 1gbDDR3

Thanks and more power!

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December 29, 2010 at 09:30:34
There is no screenshot.

The underclocking may be a restriction that's built into the motherboard when using the AUTO setting. Just switch to manual & enter the memory speed & timing info yourself.

Just so you know, 800MHz (400MHz actual) isn't the optimal RAM speed for your CPU. 533MHz (266MHz actual) is what it should be - that will give you a ratio of 3:4.

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