FSB to NB Strap

[De1337]

Okay, I have been attempting to understand this for a very long time, and I'm getting tired of it.

I simply can't figure out what the hell this function does?

I can set FSBNB 333 and 400... Def mult.= 9/6=1.5xFSB=600@400FSB <- works
but when i set the FSBNB 333, i would figure it would go 9/6=1.5x333=500, and my NB freq would be 600 with 400 strap and 500 with 333 strap. SiSoft sandra disagrees, and puts nb to 600 no matter what i do.

Also, if I set FSBNB 266, it would go 9/6=1.5x266=400, which is, according to sisoft sandra, my maximum FSB freq. This does not boot.

And my memory options change, so that the lower NB strap i set, the less (going downwards) memory options i have, at 266 it gives me 1333 and 1600?

So.. what the hell is all this? I can't seem to make sense of it.
Are my calculations way out there ?

[Warboy]

Okay, I have been attempting to understand this for a very long time, and I'm getting tired of it.

I simply can't figure out what the hell this function does?

I can set FSBNB 333 and 400... Def mult.= 9/6=1.5xFSB=600@400FSB <- works
but when i set the FSBNB 333, i would figure it would go 9/6=1.5x333=500, and my NB freq would be 600 with 400 strap and 500 with 333 strap. SiSoft sandra disagrees, and puts nb to 600 no matter what i do.

Also, if I set FSBNB 266, it would go 9/6=1.5x266=400, which is, according to sisoft sandra, my maximum FSB freq. This does not boot.

And my memory options change, so that the lower NB strap i set, the less (going downwards) memory options i have, at 266 it gives me 1333 and 1600?

So.. what the hell is all this? I can't seem to make sense of it.
Are my calculations way out there ?

Well, if You have a 400 strap, from my guess your running a X38 chipset, And their not very friendly atm with the 400 strap.

[De1337]

I do have an X38, yes.

But whether it is friendly or not, is not really what im trying to figure out... I'm trying to figure out what the hell it is :) no pun intended :)

Now im running 333FSB (def multi 9, lowered to 6) FSBNB 333, NB Freq reported 500, RAM 889...
I normally run 400FSB (def multi 9, lowered to 6), FSBNB Auto, NB Freq reported 600, RAM 800

Senseless to me

edit: current combination yields 600 (edit: 1000) less mb/s in memory bandwith, compared to the 400fsb. But I suppose this is the FSB that sets the limit here?
333x2=DDR667=5333MB/s, which fits the benchmark.

[Don_Dan]

Now im running 333FSB (def multi 9, lowered to 6) FSBNB 333, NB Freq reported 500, RAM 889...
I normally run 400FSB (def multi 9, lowered to 6), FSBNB Auto, NB Freq reported 600, RAM 800

Senseless to me


Maybe the FSBNB setting only changes the timings inside the Northbridge, so setting a FSBNB of 266 would set the most aggressive timings while 400 would set the least aggressive.

From what you have written, the NB frequency seems correct to me, because I agree that NB freq: stock multi/set multi x FSB.

But maybe what I have written is just nonsense... If it is, please forgive me, it's late here in Germany.

[De1337]

Just as late as in Denmark :D haha

/crashes on keyboard

[Don_Dan]

OH, didn't see that! Hi my neighbour! :)

[FZ1]

I do have an X38, yes.

But whether it is friendly or not, is not really what im trying to figure out... I'm trying to figure out what the hell it is :) no pun intended :)

Now im running 333FSB (def multi 9, lowered to 6) FSBNB 333, NB Freq reported 500, RAM 889...
I normally run 400FSB (def multi 9, lowered to 6), FSBNB Auto, NB Freq reported 600, RAM 800

Senseless to me

edit: current combination yields 600 (edit: 1000) less mb/s in memory bandwith, compared to the 400fsb. But I suppose this is the FSB that sets the limit here?
333x2=DDR667=5333MB/s, which fits the benchmark.

Check this link - it pretty much lays it out for you.
http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=3156&p=4