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rookie1010 12-23-2005 11:21 AM

difference between DDR and DDR-II RAMs

what is the difference between DDR and DDR-II RAMs

SHAWN 12-23-2005 11:22 AM

DDR = 184pin
DDR2 = 240 pin

burned-ati 12-23-2005 12:07 PM

well most ddr2 runs faster mhz than ddr, but does have much higher timmings so it can achieve that speed.

SHAWN 12-23-2005 12:34 PM

184pin DDR is up to 600mhz.

Ste 12-23-2005 12:36 PM

AMD doesn't support DDR2 as of yet. Therefore only Intel compatibile motherboards can use DDR2 and that is only if they have 240 Pin DDR2 RAM Slots.

Elbatrop1 12-23-2005 12:37 PM

Have a look at my Guide to RAM.

This might answer some of your questions.

rookie1010 12-23-2005 03:49 PM

thanks for the replies

i guess if you have ddr mobo's you cant fit ddr2 because they wont fit.
what do you mean by ddr has much higher timings

you guys think ddr is on its way out then, and mobo's that do 240 pin ddr2 does not do ddr?

hey elbatrop, nice article, you mean prices for RAMs in general or for SDRAM have skyrocketed.
so a cas of 2.5 is better than a cas of 3, right?

you know if there is a major difference between kingston and kingstom value ram.

with this memory
KINGSTON KVR400X64C3A/256 256MB PC3200 400MHZ CL3 (3-3-3) DDR DIMM

what does 3-3-3 mean?

have come across 3-4-4, 3-3-3 and just plain 2.5, they all seem to be cas numbers

Elbatrop1 12-23-2005 04:17 PM

DDR is kinda slowly on its way out. But it wont be obsolete for a while. When the M2 socket comes out for AMD that uses DDR2, then thats when DDR prices will start to go up as DDR2 will be used for new Intel and AMD systems.

You are right in saying that DDR2 is not backwards compatible.

I meant that price for SDRAM has gone up since it is in short supply as most systems these days use DDR RAM.

Well, the difference that you will find between value RAM and non-value RAM is the overclockability. Unless you are overclocking, you wont notice a difference in performance, and are better off getting valueRAM.

3-3-3 refers to the latency ratings. Yes, the lower the latency the better. But, lower latency is considered minor as far a noticable performance differences go.

gaara 12-23-2005 07:09 PM

DDR2 is a high pincount variant of double data rate memory which processes clock cycles on both the rise and fall of memory refresh rates. DDR2 is capable of achieving higher speeds however in order to do this the modules most sacrifice latency. Therefore if you were to compare DDRI running at 200MHz to DDRII running at 200MHz you'll find that DDRI would infact be faster

DDRII has an advantage in power and thermal specifications, using as little as 1.8v whereas DDRI used 2.6v and up to 2.8v to operate at specified speeds

Ginkotsu 12-23-2005 07:42 PM

*pops in*

I have DDR2.


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