power consumption of ram

[chris999]

Anyone knows about what's the average power on these different SDRAMs - SDR, DDR, RDRAM for a particular sizes?
Thanks.

 

[camieabz]

Dunno about the others, but SDRAM will need approx 8W per 128MB.

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[chris999]

how were you able to determine this? Is there custom circuits that allow you to find power consumption of the subcomponents in the system?

 

[HammerBot]

You could look up the datasheets on the manufacturers homepage. You probably need to look for the ones for the individual chips and do the math yourself.

<i><b>Artificial intelligence will never be a match for natural stupidity</b></i>

 

[camieabz]

I used a specialist industry tool.

See it <A HREF="http://www.pcpowerandcooling.com/maxpc/cases.htm" target="_new">here</A>

:lol:

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[upec]

Thanks for the information. I did not know RAM use so much memory.

 

[HammerBot]

I did not know RAM use so much memory.

:lol:

<i><b>"I don't understand what it is! Let me kill it!" -- Worf</b></i>

 

[knowan]

RAM uses almost all of your memory. The only thing that uses more memory is your hard drive. Your motherboard uses hardly any memory at all. ;-)

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[camieabz]

[geek award]

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[HoTShoT]

I've seen a table for estimating the power consumption of a high end PC at
<A HREF="http://www17.tomshardware.com/howto/20021021/powersupplies-02.html" target="_new">http://www17.tomshardware.com/howto/20021021/powersupplies-02.html</A>
where each 128Mb DDR memory stick uses 10W! Is that true? If so, is it proportional to the total Mb of the stick? 256Mb would take 20W and 512Mb 40W? It seems to be too much power to be dissipated from that small surface. And what's the correlation when the memory is overclocked? Why did Tom's use the 5V to get the power consumption instead of 2.5V, what is the standard for DDR memories?

The table from Tom's Hardware is based on the similar table from AMD: AMD Builders Guide for Desktop&Tower Systems.pdf (doc 26003A — May 2002). Get it at
<A HREF="http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/26003.pdf" target="_new">http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/26003.pdf</A>

<P ID="edit"><FONT SIZE=-1><EM>Edited by HotShot on 05/06/03 08:06 PM.</EM></FONT></P>

 

[flamethrower205]

woah, according to that, my system uses a fill 400W of power! Ho shizzle!

Hilbert space is a big place.

 

[Guest]

"each 128Mb DDR memory stick uses 10W! Is that true?"

seems resonable...

"is it proportional to the total Mb of the stick?"

yes, as a general rule: twice as much of the same type memory, twice as much to power it

"And what's the correlation when the memory is overclocked?"

Depends on how succesful you are in keeping the memory more busy due to the overclock...Hmm, interesting question, hah hah did that make any sense?

"Why did Tom's use the 5V to get the power consumption instead of 2.5V, what is the standard for DDR memories?"

I assume that the 2.5V supply is derived off the 5V supply, and Tom's was including the RAMs power supply losses as part of the total RAM subsytem losses. Seems logical if you believe the assumption.

 

[alltaken]

it says my comp uses more than 300W

but i only have a 250 LOL



Alltaken

 

[LtBlue14]

<A HREF="http://www.overclockers.com/articles696/" target="_new">power requirements for DDR</A>
that has the major chipmakers of DDR and their chips' power requirements

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