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[HS] Understanding RAM Timings

post #1 of 12
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Quote:
The first number, xxx, indicates the maximum clock speed that the memory chips support. For instance, DDR400 memories work at 400 MHz at the most, DDR2-800 can work up to 800 MHz, and DDR3-1333 can work up to 1,333 MHz. It is important to note that this is not the real clock speed of the memory. The real clock of the DDR, DDR2, and DDR3 memories is half of the labeled clock speed. Therefore DDR400 memories work at 200 MHz, DDR2-800 memories work at 400 MHz, and DDR3-1333 memories work at 666 MHz.
Source

Some of this is pretty well known around here, but still a good read for those that don't know a whole lot about memory.
Edited by Doogiehouser - 5/19/11 at 3:05am
post #2 of 12
And just to add, the number right after "DDR" isn't the frequency divider either. It's just the DDR standard version number. The factor between base and derived frequencies is in the technology naming itself: Double Data Rate. Likewise, there are QDR memories, Quadruple Data Rate. For these you use a factor of 4 obviously.
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post #3 of 12
CPUs use QDR (well, anything made in the last 5 years)

It's more about the latencies that's the trickier part, quite a nice read
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post #4 of 12
Good read
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post #5 of 12
Cpu-Z says that mine have a memory timing of 5-5-5-15 is that good then?

edit: I have never o/c my ram
post #6 of 12
Thanks, just what I needed.
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post #7 of 12
Nice read.

I'm a ram noob. i can't notice the difference.
post #8 of 12
Good read, the main hardware component I'm lost on.
post #9 of 12
Quote:
Originally Posted by DeviousAddict View Post
Cpu-Z says that mine have a memory timing of 5-5-5-15 is that good then?

edit: I have never o/c my ram
Is that the stock timings for your RAM? AMD CPUs benefit from lower timings as opposed to higher frequencies. Though the benefit from better RAM timings is overshadowed by the benefit of a higher NB frequency.

I haven't read through the entire thing, but I've learned a lot from their other explanatory articles.
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post #10 of 12
Quote:
Originally Posted by Seeing Red View Post
Is that the stock timings for your RAM? AMD CPUs benefit from lower timings as opposed to higher frequencies. Though the benefit from better RAM timings is overshadowed by the benefit of a higher NB frequency.
I haven't touched the ram so I presume its stock timings
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