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Confused about DDR

  • Memory
  • Hardware
  • DDR
  • RAM
Last response: in Memory
March 6, 2003 9:40:28 AM

Namely Dual DDR, are these special modules or normal DDR modules?

Do they have to be set in pairs and if so if I install 2x512MB Ram will I have 512 or 1024MB of available Ram?

The hardware scene seams allot more complicated now then in the PII/440BX days, but then again maybe not...

"The tendacy of the universe is Chaos"

More about : confused ddr

March 6, 2003 10:28:40 AM

This is how i understand it. To get dual channel DDR to work you need a motherboard with a chipset like nforce 2 that supports it. Then you need 2 standard DDR memory modules of the same type and size. Put those in and you get extra bandwith. If you installed 2 512mb ddr in Dual mode you should get 1024mb. I may be wrong though?
March 7, 2003 1:33:50 AM

You're right. And besides nforce 2, Intel E7205 and SiS 655 also support dual channel DDR.
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March 7, 2003 1:57:08 AM

all catch phrases really :) 

The simple way of explaining Dual DDR is just how the memory is accessed, instead of all the Ram being in One channel with like 3 or 4 slots (or memory banks) what they have done is basically split it in 2's (channels) of 2 slot or banks each. Now the way information is transfered and accessed is a bit differnt and faster. That is a very butchered and basic way of looking at it :) 

Rambus Ram actually did ths first.
a b } Memory
March 7, 2003 3:08:40 AM

No, the Pentium 1 usually used Dual Channel 72-pin SIMM memory. The 386 usually used Dual Channel 30-pin SIMM memory.

<font color=blue>Watts mean squat if you don't have quality!</font color=blue>
March 7, 2003 12:55:10 PM

well if you want to go that far back :) 

I just meant in this present time of technology ;-)

That brings me back to my first PC..a 286 with a whopping 1 meg of ram :)  6Mhz that jumped to 12 when you pressed the "turbo" button.
March 8, 2003 12:36:06 AM

So if I install 3x256 DDR333, then will two work wih dual channels and one work with single, or are all three are working as single rams? Installing 3 Dimm's will not make the dual channel work?? Thanks