DDR compared to DDR2

[mike_6289]

Whats the difference? My current mobo supports DDR, and not DDR2. When I build my next rig (approx 10 months) should I go for a motherboard that supports DDR2 that is more expensive, or should I go for the regular DDR motherboard?

 

[(cf)Eclipse]

in it's simplest form of explaining, ddr2 sacrifices timings a bit to allow higher mhz, requires chip makers to use FBGA packaging, and moves signal termination from the motherboard to on the memory module

 

[mike_6289]

pretty good explination, but damn them, why would they raise the timings? stupid stupid

 

[(cf)Eclipse]

cause the resultant mhz makes it worth it. show me ddr-1 that can rival the power of ddr2 at 550mhz at 4-3-3

 

[soulsaver_8229]

cause the resultant mhz makes it worth it. show me ddr-1 that can rival the power of ddr2 at 550mhz at 4-3-3

the real question is preformence in every day programs

id love to see a review on last gen intell (best of the best componets) with a new ddr2 intell (same componets) since we have no amd format to test......to see what the real diffrence is

and speaking of diffrences, you know that NASA paid over 23 million dollars to find out the diffrence between apples and oranges?

soulsaver

 

[USMC2Hard4U]

The Difference is

SDRAM Sends 1 bit of data / clock cycle

DDR Sends 1 bit of data on the Rise and Fall / Clock Cycle

DDR2 Sends 2 Bits of data on the Rise and Fall / Clock Cycle

DDR2 is Faster than DDR1 By Design. When It first came out, It offered no performance gains over DDR because they were basically at the same Speed.

Now its different however, DDR2 Modules have scaled alot Higher in MHz Allowing for more bandwidth and Timings (latency) is being greatly reduced. DDR2 is a superior Design now, It just took a little while for it to come thru, like most tech.

 

[(cf)Eclipse]

DDR2 Sends 2 Bits of data on the Rise and Fall / Clock Cycle

to my understanding, almost.

with ddr, the dram cells were in sync with the bus speed, and 2 bits per clock.
now with ddr-2, the cells run at 1/2 bus speed, but there's still two bits per bus clock.

kinda confusing, but i am fairly certain this is how it works

 

[Asian Dub Foundation]

and DDR2 use less volts

 

[Karandras]

So, right now is it worth it to upgrade? And is there a mATX board that can support DDR2?

The system that I'm building is:
CPU - 64 3000+
Mobo - ??? (going to be a mATX board)
Memory - 1024 Meg of something DDR or DDR2
Video - 6600GT OC

That's the generalness of it.

 

[lithium726]

not unless you want to go Intel, AMD chips dont support DDR2 yet, and they wont until M2.

its not really needed right now, Athlons arent really bandwidth limited ATM.

 

[Karandras]

Ahh, coo. I haven't researched DDR2 that much so thanks for the info! :-D

 

[ellover009]

DDR runs at slightly slower MHZ because of heat issues but can get tighter timing than ddr 2
DDR2 can get faster MHZ speeds but cannot get such tight timing.
DDR 2 is becoming slowly as affortable as DDR.

 

[BillR]

to my understanding, almost.

with ddr, the dram cells were in sync with the bus speed, and 2 bits per clock.
now with ddr-2, the cells run at 1/2 bus speed, but there's still two bits per bus clock.

kinda confusing, but i am fairly certain this is how it works

A topic that doesn’t come up much anymore is “wait states”. The number of wasted cycles while the CPU waits for something to do.

DDR-2 and its higher speed was supposed help this issue although I haven’t seen much said specifically on the subject.

RAM is I believe still the second slowest component in our computers next to the hard drive for passing data from “A” to “B”.

 

[(cf)Eclipse]

yup, that would probably tie directly into the latency. K8's on-die memory controller seems to have helped this out significantly now we just gotta get intel to do the same.

though, i think as far as absolute latency goes, the user is the weak link in the whole setup

 

[BillR]

though, i think as far as absolute latency goes, the user is the weak link in the whole setup

QFT on so many levels