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Is DDR2 better than DDR?

post #1 of 11
Thread Starter 
someone at school told me ddr was better that ddr2. i thought it was the other way around. Is ddr2 better than ddr?
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post #2 of 11
Quote:
Originally Posted by apollouser
someone at school told me ddr was better that ddr2. i thought it was the other way around. Is ddr2 better than ddr?
DDR2 operates at a faster "effective" frequency, but has a lot looser timings. AMD processors do well with tight timings,but INTEL processors like the higher effective frequency. Now that DDR2 has been out for awhile, they're making better sticks and the timings should be tightening. AMD felt that DDR was more beneficial for the socket 939 cpus, but is moving to DDR2 for the new sockets. Comparing DDR and DDR2 is kind of pointless because you have to compare the entire system together, not just the RAM. DDR executes 2 instructions per clock cycle and DDR2 executes 4 instructions per clock cycle. While both might be operating at an actual speed of 200mhz, DDR would be listed as 400mhz and DDR2 would be listed as 800mhz. (both of which aren't actually true)
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post #3 of 11
Quote:
Originally Posted by sccr64472
DDR2 operates at a faster "effective" frequency, but has a lot looser timings. AMD processors do well with tight timings,but INTEL processors like the higher effective frequency. Now that DDR2 has been out for awhile, they're making better sticks and the timings should be tightening. AMD felt that DDR was more beneficial for the socket 939 cpus, but is moving to DDR2 for the new sockets. Comparing DDR and DDR2 is kind of pointless because you have to compare the entire system together, not just the RAM. DDR executes 2 instructions per clock cycle and DDR2 executes 4 instructions per clock cycle. While both might be operating at an actual speed of 200mhz, DDR would be listed as 400mhz and DDR2 would be listed as 800mhz. (both of which aren't actually true)
hes completly right there isnt much to say other then tha lol
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post #4 of 11
well, you cant compare them. its like comparing a GF6800 to a GF7800 - both are the best, but one is simply older and was the best the day it came out.

ddr2s architecture allows it to work on higher frequencies, build smaller chips thus placing more chips on one board allowing to sell bigger ram modules and so one.

after all - yes, it is better. but its a relatively new technology, so it has some flaws (like the latency is worse then that of the DDR, but thatll be fixed in a while...). and DDR3 is even better, comming soon

hope thisll help ya.
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post #5 of 11
Thread Starter 
thanks for the clear up. that was bugging me all day long
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post #6 of 11
Quote:
Originally Posted by sccr64472
DDR executes 2 instructions per clock cycle and DDR2 executes 4 instructions per clock cycle. While both might be operating at an actual speed of 200mhz, DDR would be listed as 400mhz and DDR2 would be listed as 800mhz. (both of which aren't actually true)


I thought that it was "actually true" because mhz is a measure of "work" and since ddr does two sets of 200mhz "workloads" per clock cycle that it's effectivly 400mhz. I'm so confused how far off am I here.

Also in the case of ddr2, would I then need to divide the 667 by 4 to get actual mhz on this chip?
http://www.tigerdirect.com/applicati...?EdpNo=1440815
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post #7 of 11
Quote:
Originally Posted by Buddy lee
I thought that it was "actually true" because mhz is a measure of "work" and since ddr does two sets of 200mhz "workloads" per clock cycle that it's effectivly 400mhz. I'm so confused how far off am I here.

Also in the case of ddr2, would I then need to divide the 667 by 4 to get actual mhz on this chip?
http://www.tigerdirect.com/applicati...?EdpNo=1440815
No, effective frequency and actual frequency are completely different things. Hertz or Hz is a scientific unit meaning (1/sec), so 1 MHz means 1 million cycles per second. DDR operating at 200 MHz is actually operating at the 200 MHz system clock, but is triggered on both the rising and falling edge of the system waveform. They'll describe it as operating "effectively" at 400MHz, but they're simply saying that it performs as fast a SDR would operating at 400MHz. Make sense? It's actually running at the same speed as the system clock. (200 MHz) Everything in your system is synchronized to a crystal that oscillates to create the system clock. Everything is then either a multiplier of or a division of that waveform.
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post #8 of 11
Quote:
Originally Posted by sccr64472
Everything in your system is synchronized to a crystal that oscillates to create the system clock. Everything is then either a multiplier of or a division of that waveform.
dats fuhny, but you didn't answer my question. Is the ram in the link I posted 166 mhz ram? If ddr2 is *4 instead of *2 wouldn't you then have a limited fsb of 166 because of the ram, or do the new boards have different settings? Another way to ask is would you need 800mhz ddr2 to run 200fsb.
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post #9 of 11
Quote:
Originally Posted by Buddy lee
dats fuhny, but you didn't answer my question. Is the ram in the link I posted 166 mhz ram? If ddr2 is *4 instead of *2 wouldn't you then have a limited fsb of 166 because of the ram, or do the new boards have different settings? Another way to ask is would you need 800mhz ddr2 to run 200fsb.
What's funny? Yes, if you want to know the actual frequency the ram is running at....take the PC designation and divide by 16 for DDR and DDR2. PC5400 DDR2.............5400/16 = 337.5 mhz.
Edited for accuracy
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post #10 of 11
So DDR2 should actually be called QDR?
Very nice!
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Very nice!
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