DDR3 RAM stuff

Chris Oelerich chris at oeleri.ch
Mon Nov 4 14:25:32 EST 2013


isn't that where the 'double' part of ddr comes in?


On Mon, Nov 4, 2013 at 2:21 PM, Curt Howland <Howland at priss.com> wrote:

> The last time I rebuilt my system I "forgot" to include any swap. As a
> result, I've been paying attention to RAM use, speed, etc.
>
> I've had no problems. 4GB of RAM seems to be sufficient, but that
> doesn't stop me from using lshw to pull up the mobo, check the specs,
> and see what 16GB costs today on NewEgg.
>
> Anyway, it's finally gotten to me that the freq given in lshw for my
> DDR3-1600 RAM is 800MHz.
>
>         *-bank:0
>              description: DIMM Synchronous 800 MHz (1.2 ns)
>              product: STT-W1600UB2G90000
>              vendor: Manufacturer00
>              physical id: 0
>              serial: 00000000
>              slot: DIMM0
>              size: 2GiB
>              width: 64 bits
>              clock: 800MHz (1.2ns)
>
> I know I've fiddled with the BIOS before, and I'm quite sure that I've
> verified that it's correctly detecting the 1600, but it's always said
> 800MHz in lshw.
>
> Today, when giving the issue yet another look-see, I came across this:
>
>
> http://www.amd.com/us/products/desktop/processors/phenom-ii/Pages/phenom-ii-model-number-comparison.aspx
>
> Support for unregistered DIMMs up to PC2 8500(DDR2-1066MHz) and PC3
> 10600 (DDR3-1333MHz)
>
> Now I always thought that RAM was handled by the mobo, not the CPU,
> and if the mobo was built with that CPU then it would deliver the RAM
> at whatever speed the mobo would deliver it.
>
> Is this telling me, actually, that the CPU can only handle up to
> DDR3-1333 on that mobo, or do I go by the mobo speed limits?
>
> Either way, 800MHz doesn't look right.
>
> Curt-
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