Mixing DDR2 MHZ

[Halibel21]

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Hello Again GeeksZ

Ask ko if its ok.

My Mobo Only supports a DDR 533 but nkoy DDR2 667 or DDR 800

my question is will it automatically underclock to 533.

[cesski]

someone answered this question for me.. mudretso ra daw siya underclock..

[jintatsu]

Yep derecho ra na siya mo underclock..

[Halibel21]

So if ako MOBO supports only 667 pwede nko butangan ug 2gig na 800mhz?

[stealthghost]

backward compatible na..

as far as I know, which is smaller, mao na'y hagdun nga frequency..

533 < 667, so, ang 667 mahimong 533..

[Halibel21]

nya kung 800mhz mo 533 cya or 667?

[ninzska21]

all RAM has 3 SPD datas in it ...

SPD = Serial Presence Detect (it;s like a BIOS for RAM)

in the SPD, it has all the intricate timing for RAM to function ... the best part is that it also define 3 timings for 3 different speed (there' are just a few fields that differentiate all 3 speed).

The main reason is backward compatibility [your case] and market availability (phased out on slower speed)

for e.g. if you have DDR2-800, in its SPD, it has timing data for DDR2-800, 667, and 533.

so, u can plug ur DDR2-800 on a DDR2-533 board, and the RAM piece will definitely work (of course u sacrifice the cost and performance for buying DDR2-800)...

u can even plug in DDR2-800 RAM on an ancient DDR2-400 board, and it will still work.

market availability: RAM chips are constantly evolving by the semicon company. They keep ramping up new density and speed, therefore from DDR2-400 --> 533 --> 667 --> 800

[yes, DDR2 started from 400, which it continues from DDR1-400]


similar to DDR3 now .. it's all started 'evolving' from DDR2-800 --> DDR3-800 --> DDR3-1066 and so on and on and on ....

luckily, the SPD really helps us as buyers .... last time i even bought DDR2-667 and plug into an ancient DDR2-533 board

it runs baby!

[diens]

kung mogamit ka ug 533 unya ang usa 667 pwede ra na

[Sempron Guy]

it will run @ the slowest speed sa duha. Say duha ka ram that runs @ 533mhz ang usa while the other runs at 667mhz. Both will run at 533mhz.

[ninzska21]

so it is safe to advice na maski ang mobo d mo support ug 800mhz. ky mo buy ky mo underclock raman ang for future use?