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[HC]Elpida Begins Shipments of 30nm 4GB DDR3 SO-DIMMs - Page 2

post #11 of 18
Yes, for the peak data rate of the SDRAM modules, not of the DIMMS, as the Elipda article states, it is the max datarate of the RAM
Edited by wcdolphin - 12/21/10 at 9:45pm
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post #12 of 18
Quote:
Originally Posted by cdolphin View Post
Yes, for the peak data rate of the SDRAM modules, not of the DIMMS, as the Elipda article states, it is the max datarate of the RAM
The article is wrong, the units used are wrong unless the memory is incredibly slow... 2 bits per clock is horrendous and defeates the whole point of a 64bit bus if it can only shift 2 bits on each clock.
Edited by jacobthellamer - 12/21/10 at 9:55pm
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post #13 of 18
Quote:
Originally Posted by flashbulb View Post
that's an awfully strange node, why not just jump to 28nm?
maybe it's more expensive so they just went inbetween 32nm and 28nm
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post #14 of 18
I don't know why we are taking speed into account here. One, it's a laptop module. Two, RAM speed has very little actual effect on performance.
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post #15 of 18
Megahertz is actually a measure of frequency, and not necessarily a measure of data speed.
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post #16 of 18
Sorry guys, they article kind of shot themselves in the foot by throwing in an ambiguous thing in parenthesis.

Quote:
Data Transfer Rates1866Mbps (Max.)
This is an absolutely correct way to state the PER BIT transfer rate of the sticks. I.E. the frequency. Because they put (max) next to it made it seem like they were trying to say that BANDWIDTH of the module was 1866Mbps, which is patently ridiculous. They in all likelihood had no idea what they were writing about and copy and pasted a spec from a white paper that -would- reference clock speed in this way. You all made the invalid assumption that is was the module bandwidth they were referring to.

Jeremiah and twocowbells were right.

In fact reference clock speed CAN BE ACCURATELY specified as Mhz CANNOT be accurately stated in 1866Mhz because, in fact, the sticks are NOT operating at 1866Mhz, they're operating 933MHz but TRANSFERRING twice per clock cycle HENCE why they say it has 1866Mbps TRANSFER rate.

HAD THE ARTICLE SAID THE STICKS BANDWIDTH WAS 1866Mbps.... they'd have been dead wrong. All you had to do was take the transfer speed of 1866Mbps and multiply it by the bus width of 64bits.
Edited by Ihatethedukes - 12/22/10 at 12:30am
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post #17 of 18
units of measurement: srs business.
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post #18 of 18
Quote:
Originally Posted by Ihatethedukes View Post
Sorry guys, they article kind of shot themselves in the foot by throwing in an ambiguous thing in parenthesis.



This is an absolutely correct way to state the PER BIT transfer rate of the sticks. I.E. the frequency. Because they put (max) next to it made it seem like they were trying to say that BANDWIDTH of the module was 1866Mbps, which is patently ridiculous. They in all likelihood had no idea what they were writing about and copy and pasted a spec from a white paper that -would- reference clock speed in this way. You all made the invalid assumption that is was the module bandwidth they were referring to.

Jeremiah and twocowbells were right.

In fact reference clock speed CAN BE ACCURATELY specified as Mhz CANNOT be accurately stated in 1866Mhz because, in fact, the sticks are NOT operating at 1866Mhz, they're operating 933MHz but TRANSFERRING twice per clock cycle HENCE why they say it has 1866Mbps TRANSFER rate.

HAD THE ARTICLE SAID THE STICKS BANDWIDTH WAS 1866Mbps.... they'd have been dead wrong. All you had to do was take the transfer speed of 1866Mbps and multiply it by the bus width of 64bits.
Yes the transfer rate seems to be the bus times the operations per clock times the clock rate(933in this case).

No, Mbps does not equal frequency. It is however proportional. For instance you cant say current through a circuit(fixed resistance DC) is the same thing as voltage just because it is proportional (V=IR)...

Say that D=data rate, F=frequency, C=cycles per second(twice clock - 933x2). This would give the equation D=FC, D is not equal to C except at .5 hertz..
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