DDR2 667 memory reported by P5WD2 as 533?

Archived from groups: alt.comp.periphs.mainboard.asus (More info?)

Hello,



I purchase Corsair TWIN2X1024-5400C4 1GB DDR2-667 XMS2-5400 Xtreme
Performance Memory for use in an Asus P5WD2 board. The memory is detected
by the BIOS as: 1 Gb of PC2 - 4300, which to my knowledge is the slower,
533MHz memory. I expected PC2-5400 (667MHz) memory. What am I missing?



Thanks for your comments!

Archived from groups: alt.comp.periphs.mainboard.asus (More info?)

Paul,

I'll try your suggestions to verify that all is well.

Thanks for the education!


"Paul" <nospam@needed.com> wrote in message
news:nospam-1206051505460001@192.168.1.178...
> In article <EJqdnTMsp9aJ0jHfRVn-oA@suscom.com>, "NS" <mhdevaux@rcn.com>
> wrote:
>
>> Hello,
>>
>> I purchase Corsair TWIN2X1024-5400C4 1GB DDR2-667 XMS2-5400 Xtreme
>> Performance Memory for use in an Asus P5WD2 board. The memory is
>> detected
>> by the BIOS as: 1 Gb of PC2 - 4300, which to my knowledge is the slower,
>> 533MHz memory. I expected PC2-5400 (667MHz) memory. What am I missing?
>>
>>
>> Thanks for your comments!
>
> The contents of the SPD EEPROM on the DIMM, a tiny chip that records
> timing information, are controlled by JEDEC standards. For non-standard
> frequencies, expect to find the next lowest standard frequency and
> timing recorded in the EEPROM. That means, for overclocker memory,
> you will not always find the actual ratings of the memory stored in
> there.
>
> The problem is, if the manufacturer put the real ratings in there,
> there are some motherboard BIOS that would become confused. Rather
> than run the risk that the computer cannot POST, the standard
> frequency is used instead. You can then enter the BIOS and set
> the timings manually as desired.
>
> The memory will have been tested at the factory, at the stated 667MHz
> speed, and likely will overclock a lot higher than that. There
> are a few articles on Anandtech, about how high some of these
> products can be pushed. Use memtest86+ and Prime95, to test that
> all is well.
>
> HTH,
> Paul