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667/800 ram

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#1 davidphillips


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Posted 12 February 2014 - 01:51 AM

can someone tell me what sort of ram this is,(DDR2 4GB Desktop RAM DDR667/800), how can it be both. this taken from an auction site. Logic tells me this is not right, maybe someone can enlighten me please.

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#2 TsVk!


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Posted 12 February 2014 - 02:50 AM

My logic agrees with you.

#3 jonuk76


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Posted 12 February 2014 - 02:51 AM

RAM of that speed will be DDR2.  Desktop DDR2 modules have a 240pin connection.  Original DDR modules have a 184pin connection.  The 'key' is also in a slightly different position, preventing you from inserting a DDR2 module into a DDR motherboard, or vice versa.  Have a look here for some side by side comparisons - http://www.auscomtech.com.au/Products/ddr%20v%20ddr2.htm


DDR stands for double data rate (transfers data on both the rise and fall of the clock signal), so a speed of DDR 800 is just telling you that it's 400mhz RAM that has an effective data rate of 800mhz.  While DDR, DDR2, DDR3 etc. are different standards.


I don't like the fact they are selling it as DDR667/800.  It's one or the other surely?  Perhaps they mean it's 800mhz memory that can be used at 667mhz.  I prefer getting from a known brand like Corsair, Kingston or Crucial.  It's very slightly more expensive but bad RAM can cause big problems.  And they aren't always immediately obvious.

Edited by jonuk76, 12 February 2014 - 02:53 AM.


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