Nehalem-EP......BLOOMFIELD

[twwen2]

That is fairly easy ... statistically, transistors are suppose the transmit only electrons, this is how you design your semi conductor layers. when you increase the voltage, you increase the change to push an atom in its entire self instead of just a electron ... (Covalent collition) if you loose too many atoms ... say bye bye to the semi conductor layer ... then you just lost one of your transistor ...

simple, isn't it?

Ah yes, i get the fundamentals of electron transfer and such.

What i don't understand is this:
We have been running our CPUs at 1.4-1.5v and our RAM at 2.0-2.2v without problems.
Why does Nehalem have a problem running these RAM voltages? Is it because the CPU and RAM share the same voltage?

[Drwho?]

Ah yes, i get the fundamentals of electron transfer and such.

What i don't understand is this:
We have been running our CPUs at 1.4-1.5v and our RAM at 2.0-2.2v without problems.
Why does Nehalem have a problem running these RAM voltages? Is it because the CPU and RAM share the same voltage?

The memory controler of Nehalem is in 45nm, the mem controler of Yorkfield is in 65nm in the X48 ... When you increase integration, you get a change to decrease the voltage and become more power efficent. Overclockers are the only one looking for voltage increase ...

The memory guys are ready with better memory. It is all logical, there is not problem.

[Blauhung]

The memory controler of Nehalem is in 45nm, the mem controler of Yorkfield is in 65nm in the X48 ... When you increase integration, you get a change to decrease the voltage and become more power efficent. Overclockers are the only one looking for voltage increase ...

The memory guys are ready with better memory. It is all logical, there is not problem.

hehe, X48 is Bearlake on 90nm

[Drwho?]

hehe, X48 is Bearlake on 90nm

oupssss , correct, it is 90!

[savantu]

Ah yes, i get the fundamentals of electron transfer and such.

What i don't understand is this:
We have been running our CPUs at 1.4-1.5v and our RAM at 2.0-2.2v without problems.
Why does Nehalem have a problem running these RAM voltages? Is it because the CPU and RAM share the same voltage?

In the past chipsets were build on a n-1 process generation.As a result , the IMC was older tech than the CPU.It also ran at far lower frequency in a higher voltage environment.

Moving it on die , means using the latest generation process which is more sensitive to voltage ( the goodies Intel uses at 45nm seems to have exacerbated that ).In other words , for traditional chipsets they could use bulkier , more resistant transistors that run at low frequency.Not the case anymore.

A solution seems to be playing with the independent voltages.Increase NB/IMC voltage so the difference to Vdimm stays the same or is lower.