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Can I use 2 RAM sticks at different speeds?

July 16, 2010 at 02:23:00
Specs: Windows 7 Ultimate x64

Hi
I currently have a Kingston 2GB DDR2 @
400Mhz and I want to upgrade the RAM but
the 400Mhz is not available. Instead there is
Kingstion 2GB DDR2 @ 800Mhz. My system
supports both speeds. So can this
combination work.
Please note that I play games on my PC. Now
I was getting a little low on RAM

My PC Specs are:
*Core2Quad Q8400 @ 2.66Ghz
*2GB DDR2
*320GB HDD @ 7200RPM
*Nvidia 9800GT
* Motherboard is Asus P5KPL-VM

Please tell me can I use the two RAM sticks.
Would it cause any problems with playing
games.

Please tell me everything there is to know. I
told you all the specs.

Please HELP!


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#1
July 16, 2010 at 09:50:11

I believe you're confusing RAM frequency (which is the true speed) with the advertised DDR rating (which is double the frequency). DDR2-800 actually runs at 400MHz frequency...sometimes the speed is listed as 400MHz, sometimes as 800MHz. I'm fairly sure what you have is DDR2-800, not DDR2-400.

"Please tell me can I use the two RAM sticks"

Of course, but ideally they should be a matched pair so that you can enable dual channel mode on your motherboard.

To confuse you even more, your Q8400 runs at 1333MHz FSB which is actually 333MHz frequency. So if you have no plans to overclock, all you really need is RAM that runs at 333MHz frequency...that would be DDR2-667. You can obviously run DDR2-800 with a 1333MHz FSB CPU but the configuration is not optimal. What you should do is either underclock your DDR2-800 RAM to DDR2-667 speed, or overclock your CPU to 1600MHz FSB to match your DDR2-800 RAM speed.


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#2
July 16, 2010 at 10:56:16

@jam
*Nvidia 9800GT

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#3
July 16, 2010 at 14:10:20

@ kuwese,

I guess I missed that ;-)

FIXED! Thanks.


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