DDR SDRAM and SDRAM what are the diferences!? 1

[Titan12022]

I take it that a computer that is say..

DDR400 SDRAM (PC3200), unbuffered, no ECC
DDR333 SDRAM (PC2700), unbuffered, no ECC

compatible could not run DDR SDRAM?

(I am still not used to new stuff you can't get for under $20)

 

[garebo]

You are right, sdram is totally different and the cutouts on the bottom are different so you cant use one by mistake.
NOT compatible!

sdram-older motherboards
ddram - newer motherboards
There is also rdram but that is another story.
Most today use ddr.


Good advice + great people = tek-tips

 

[DragonQ0105]

One tip: when buying DDR RAM, always get PC3200 (or 400MHz) DDR RAM. Why? Because they're all backwards compatible (i.e. if you get a 400MHz stick of RAM, it can run at 266MHz if that's the maximum your motherboard supports), and they're all about the same price (DDR3200 is never more than a few quid more expensive than DDR2100) - and you'll be future-proofing your system!

 

[micker377]

Technical difference:

SDRAM (Synchronous) - 133 bus runs at 133 speed.
DDRRAM (Double Data Rate) - 133 bus reads the memory on the "up" slope, and "down" slope for the equivilant of 266 speed.

 

[DragonQ0105]

DDRRAM can have a 133, 166 or 200MHz Bus actually.

 

[cdogg]

> [blue](DDR3200 is never more than a few quid more expensive than DDR2100) - and you'll be future-proofing your system![/blue]

Sure it can't hurt if it's within the same price. But likely the next upgrade will include the use of DDR-II, so "future-proofing" isn't exactly the best reason to spend much more.


> [blue]for the equivilant of 266 speed[/blue]

Well, it's not a "true" equivalent, but that's another story for another day.


~cdogg
"Insanity: doing the same thing over and over again and expecting different results." - Albert Einstein
[tab][navy]For general rules and guidelines to get better answers, click here:[/navy] faq219-2884

 

[micker377]

I just used the "133" as a simple reference.

 

[garebo]

What gets me about ddr is that i bet its not that much better than sdram, only came up with ddr as a way around royalties for rdram, but thats another thread.


Good advice + great people = tek-tips