Can GDDR3 and DDR3 be used together?

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Matthew Wai

Matthew Wai

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Jan 9, 2015
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My motherboard is ASUS H81M-A, which supports 2 x DIMMs, max. 16GB DDR3. The single RAM now in use is GDDR3-1333 2GB 1.5V EP.
Can GDDR3 and DDR3 be used together?
 
Solution
giantbucket
a line near the top says "PC3-10700 (667MHz)" which means DDR3-1333. why? because DDR means Double Data Rate, so 667 times 2 is 1333
the JEDEC line that matches the 667MHz has the 9/9/9/24 timings indicated

so THAT particular memory stick works as a DDR3-1333 with CL9 timings.

if you were to try to use it at a SLOWER speed like DDR3-1066 (because let's assume you have a stick of DDR3-1066 kicking around), then 1066/2=533, so JEDEC says it would behave like a DDR3-1066 CL7.

on the flip side, it won't work as a DDR3-1600 because the line near the top says "Max Bandwidth is PC3-10700 (667MHz)", and DDR3-1600 is 800MHz and 800 is more than the 667 your stick is spec'd for
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giantbucket

giantbucket

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looks like standard DDR3-1333 CL9 stuff to me. you could very likely buy whichever DDR3-1333 CL9 is on sale at the cheapest price in either 4G or 8G capacity, insert it, and not worry about it. as long as you're not trying to overclock it or do something unusual, it should work just fine and the motherboard should auto-set the most compatible settings.

in a friend's laptop, I mixed a 2G DDR3-1333 with a 4G DDR3-1600 and it automatically combined them to 6G and works fine (presumably both are set to 1333 as the common speed)

in my own laptop, I mixed a 4G 1333 Kingston (4yrs old) with a 4G 1333 Mushkin (new, with "Apple" sticker) and my Dell works perfectly, showing 8G total
 
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giantbucket

giantbucket

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Nov 17, 2013
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a line near the top says "PC3-10700 (667MHz)" which means DDR3-1333. why? because DDR means Double Data Rate, so 667 times 2 is 1333
the JEDEC line that matches the 667MHz has the 9/9/9/24 timings indicated

so THAT particular memory stick works as a DDR3-1333 with CL9 timings.

if you were to try to use it at a SLOWER speed like DDR3-1066 (because let's assume you have a stick of DDR3-1066 kicking around), then 1066/2=533, so JEDEC says it would behave like a DDR3-1066 CL7.

on the flip side, it won't work as a DDR3-1600 because the line near the top says "Max Bandwidth is PC3-10700 (667MHz)", and DDR3-1600 is 800MHz and 800 is more than the 667 your stick is spec'd for
 
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Solution
Sakkura

Sakkura

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Aug 22, 2011
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Well, it might work, but you'd be overclocking then.
 
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