New ram on old motherboard

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omega1988

Honorable
Oct 9, 2014
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hello everyone!

i got this motherboard "ASUS P5QC"

and old DDR2 667hz and i thinking of buying a DDR3 and i consider that if the board dies so i can use the DDR3 in my next motherboard . so what DDR3 should i buy ? i heard that DDR3 1600hz can work with boards that supporting max of 1333hz , that they just will downgrade to 1333 . now in that case i think best thing to do is buying a DDR3 with max hz or not ? correct me and suggest please
 
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It probably has an explanation for the symbol on the same page.
It would mean that these are over clocked speeds because the FSB is only specified at 1333 MT/s.
The motherboard should automatically run the RAM as DDR3-1333 unless you change it in the BIOS and I would suggest you do not increase the speed past DDR3-1333 even if using faster RAM.
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VincentP

Splendid
Oct 18, 2013
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There is no guarantee that ram faster than DDR3-1333 will work with this board.
In an older board like this, the memory controller is actually on the motherboard and it will likely not support anything faster than what is specified.
With newer CPUs, the memory controller is in the CPU. In general the motherboard must support the frequency of installed RAM and can then this will run at the default speed supported by the CPU if this is slower.

I suggest you find 2 x 4GB dimms of DDR3-1333 unbuffered memory. Make sure you don't buy ECC or server memory.
 
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VincentP

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Oct 18, 2013
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There are people on this forum I would believe if they told me it would work, but none of them has responded on that thread.
Notice also the thread is two years old but the original poster never came back and wrote that it worked.
I don't believe that DDR3-1600 will work with your board.
I think you should stick to the supported speeds listed by the manufacturer.
 
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VincentP

Splendid
Oct 18, 2013
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I would have expected DDR3-1600 RAM to have a default DDR3-1600 profile. That's fine if the motherboard supports this and then runs the RAM at DDR3-1333 speed but this motherboard does not list compatibility for DDR3-1600 modules. If the motherboard does not support the default RAM profile, the RAM won't work will it?
 
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VincentP

Splendid
Oct 18, 2013
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DDR3-1866 and faster typically default to DDR3-1600.
If DDR3-1600 is going to work, these should work just as well.

DDR3-1600 is the fastest RAM supported by Intel without over clocking anyway, and this isn't going to increase as they are moving to DDR4 for next generation CPUs.
DDR3-1866 is the fastest RAM supported by AMD without over clocking.
 
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VincentP

Splendid
Oct 18, 2013
4,105
1
26,965


It probably has an explanation for the symbol on the same page.
It would mean that these are over clocked speeds because the FSB is only specified at 1333 MT/s.
The motherboard should automatically run the RAM as DDR3-1333 unless you change it in the BIOS and I would suggest you do not increase the speed past DDR3-1333 even if using faster RAM.
 
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