[lug] memory configurations

[D. Stimits]

D. Stimits wrote:

> I'm looking at some advertisements for RAM, and I see there is a 
> "single rank" and "dual rank" rating (I'm looking at Kingston, don't 
> know if this is just their own thing or if it applies to DDR2 in 
> general), and also an x4 and x8 rating. What's the difference between 
> these, especially with respect to adding to SMP machines?


Well...reply to my own email. I *think* from what I've found that single 
rank is better, that dual rank refers to essentially two separate ram 
modules being on one physical slot. E.G., a dual rank would logically 
look like two separate slots to the system, and a single rank would look 
like just 1 logical slot (both would require 1 physical slot). Anyone 
know if this is basically correct?

I'm still trying to figure out the x4 and x8 rating, I'm wondering if 
this is just some latency rating...anyone have an interpretation on the 
x4 or x8 ratings? Which is better?

D. Stimits, stimits AT comcast DOT net