1×8gb or 2×4gb for apu?

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Charles Petit

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Apr 24, 2014
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I am getting a mini itx mb so obviously it only has two ram slots. I will also be getting an A8-7600 apu so should I get 2×4gb 2133ghz or 1×8gb 1866mhz? If I did the one 8gb stick then I could upgrad later to 16gb, which would be better?
 
Solution
madsmagnus
Buying RAM will always be a jungle mate but as others have stated you have to get Dual Channel(2 blocks) to spread out the workload. You haven't told us exactly what the machine will be used for but try to go with this baseline: When it comes to finding out what speed/what latency there is a pretty awesome formula you can use.

CL/MHz*2000 = cyclespeed in ns

Example: RAM kit is 2x4GB DDR3 1600MHz CL9 and RAM kit is 2x4GB DDR3 1866MHz CL10

9/1600*2000=11,25 ns cycletime.
10/1866*2000=10,72 ns cycletime.

So fx in that case, the higher speed memory is faster, but if it fx was CL11 the cycletime would be 11,79 - being slower than the 1600MHz.


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madsmagnus

madsmagnus

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Nov 6, 2013
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Buying RAM will always be a jungle mate but as others have stated you have to get Dual Channel(2 blocks) to spread out the workload. You haven't told us exactly what the machine will be used for but try to go with this baseline: When it comes to finding out what speed/what latency there is a pretty awesome formula you can use.

CL/MHz*2000 = cyclespeed in ns

Example: RAM kit is 2x4GB DDR3 1600MHz CL9 and RAM kit is 2x4GB DDR3 1866MHz CL10

9/1600*2000=11,25 ns cycletime.
10/1866*2000=10,72 ns cycletime.

So fx in that case, the higher speed memory is faster, but if it fx was CL11 the cycletime would be 11,79 - being slower than the 1600MHz.


 
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Solution
madsmagnus

madsmagnus

Honorable
Nov 6, 2013
182
1
10,710


Benchmarks or it didn't happen.
 
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DonkeyOatie

DonkeyOatie

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Sep 16, 2014
12,141
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50,960


The OP or you can research the advantages of interleave and find out if that provides any benefit for their application. Interleave improves performance. There was no question about dual channel. The only doubt I have is whether the Crucial Ballistix 4Gb is still interleaved, since most 4Gb memory is not.
 
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