[kwlug-disc] Upgrading RAM - CAS, latency, ...

[Ron Singh]

If the used RAM is DDR3-1600(which, if I recall correctly, actually is
1333Mhz effective speed), buy it and add it to your system -- if it is
DDR3-1333(clocking in at 1066Mhz effective speed), then *don't* buy it as
it will slow down all the system's RAM to 1066Mhz effective speed.

I recall 4G DDR3 modules were mostly available as DDR3-1066/1333(meaning
8500/1066Mhz effective). Not sure if any was made as DDR3-1600.
8G modules were mostly DDR3-1600(1333Mhz effective speed), so you might be
better served hunting for a deal on that capacity.

Thanks,

Ron S.



On Mon, Mar 7, 2022 at 10:32 PM Ronald Barnes <ron at ronaldbarnes.ca> wrote:

> Ron Singh wrote on 2022-03-07 19:07:
>
> > Model of mobo and CPU model will help to determine what speed the RAM
> > will be clocked at.
>
> Mobo specs from lshw:
>
> ASUSTeK COMPUTER INC.
> M5A99X EVO R2.0
> AMD FX(tm)-8320 Eight-Core Processor
>
>
>
> > What is the speed rating of the used DDR3?
>
> Unsure - will have to examine it pre-purchase.
>
>
> > As a rule, you*can*  use slower RAM, but the entire system will clock
> > down to accommodate the slower RAM(which you no want).
>
> Yeah, looks like my RAM is rated for 1600MHz but is running at 1333MHz
> due to ... BIOS settings? Motherboard limitations?
>
> Motherboard appears to support these RAM DIMMs:
>
> 1066MHz - 1866MHz and 2133MHz OverClocked.
>
> (Side note: cannot copy from the PDF - Okular says: "Copy forbidden by
> DRM".  That's just weird.)
>
>
> Looks like I can set the Memory Frequency to 1600MHz under the "Ai
> Tweaker" tab in BIOS.
>
>
> That helpful tip was followed by pages of mind-numbing (YMMV) info on
> overclocking.
>
> I think I may play with these a bit, at least memory frequency to
> 1600MHz initially, before I even buy more RAM.
>
>
> Thanks!
>
> rb
>
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