Memory 667mhz on 533mhz board. Work ?

[jdonado]

I need konw if i can use a 667mhz ddr2 in a motherboard that only support 533mhz

 

[chuckshissle]

What motherboard is that? Give us more infor about it like manufacturer's links.

 

[jdonado]

Its in general, im a part reseller and have the doubt about that, if i could do the same whit the ddr2 modules that do with ddr1 , so depend of the board then ? if the board only suppor 533mhz and i use a 667mhz the board se the mem like 533mhz ?

 

[SuperFly03]

It will always default to the more conservative value. So in this case, your motherboard is the more conservative and therefore the DDR2 667 should run at 533.

 

[jdonado]

exlenet, thnx a lot

 

[Crashman]

Yes, all RAM can run at slower speeds...

But I know of no DDR2 motherboards that don't support at least DDR2-667.

 

[rwaritsdario]

What about DDR2 <1000, would it POST at the rated speeds on DDR2 800 standard mobos?? Or would it post at 400Mhz and then I'd simply have to set it manually at the rated speeds??

 

[SuperFly03]

If your mobo is rated for DDR2 800 and you supply it with DDR2 533 it will POST at 533, like I said it defaults to the most conservative value to guarantee operation initially. I think that is the point you were after.

 

[rwaritsdario]

No, it wasnt. Its about using higher rated RAM than the motherboards standard.
I'm not sure what are the problems that would arose since generally DDR2 <1000 uses high voltages, and of course, high speeds.

 

[Crashman]

Most DDR2-800 is programmed as DDR2-533 or DDR2-667. Same goes for faster varieties. This stuff is all overclocked at it's brand-rated speed, and requires manual configuration anyway.

There's a "new technology" that can make the nonstandard adjustments for you, called EPP or SLI-Memory. It's only an extended value, added to SPD, that tells the motherboard what voltage is needed to overclock the memory to a certain speed.

 

[Mondoman]

Just note that BOTH the MB and RAM module need to be EPP-capable for it to work.

 

[rwaritsdario]

So the standards of the motherboard is reffering to the chip's specs, not the manufactured modules?

 

[Crashman]

Niether. SPD values for "performance modules" are arbitrarily assigned by the manufacturer in hopes that they'll be slow enough for your system to boot, whereafter you enter BIOS to raise the voltage so that when you set the "advertised" values you can still reboot.

 

[rwaritsdario]

So theyre set at any low speed with low voltage for the system to boot right up. After that, you can set the voltage at the advertised specs and reach the advertised speeds and timings.

 

[Crashman]

yes