FSB Strap...

V3g3tto

V3g3tto

V3g3tto

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Before i ask what is probably a blindingly obvious question to some, yes i've read the guides/stickies,etc. :p

Just what exactly is the FSB strap in my bios? I have a P5K mobo, and my OC choices are initially upping the FSB frequency, then choosing from a list of 1:1 ratio DRAM frequencies below it (unless i manually +/- it). Between this is the Strap setting however, what exactly is this? As far as i understand it in the most basic terms:

FSB Frequency- The speed of the bus between the processor and memory (i think..), increasing this increases the information passed along it. Multiplying this by 4 gives you the actual total FSB (in my case with 333mhz, the FSB is 1333mhz).

DRAM frequency - Obviously the speed of the RAM and ideally, being DDR, is twice that of the FSB to give a 1:1 ratio (which i think makes it a lot more stable?).

So what the hell is the FSB Strap? i got choices between 166mhz and upwards. I see endless mention of the RAM divider (damn lingo),etc, but no mention of what this setting actual does. Anyone able to explain? Also, am i partially right in what i said above?
 
Ahh ok thanks. Doesn't seem i need to pay too much attention to it then and can leave it on auto.

As i see it then, i shouldn't need to touch the strap at all as my mobo should walk over 400mhz FSB. Also shouldn't need to loosen my timings as i only wish to push RAM frequency to around 800Mhz.

Ahh so by RAM divider they basically refer to the ratio. i.e. 5:6 (FSB:RAM) ratio would be 300 FSB and 720mhz RAM. This of course increases the speed of the RAM, however in my case would kind of bottleneck as the FSB is not high enough.

From what i can see, the only reason anyone would want anything but a 1:1 ratio, if i read this right, is if their motherboard doesn't support a high FSB.
 
In theory PC6400 RAM is fine for most as to run it at it's optimum speed of 800mhz, you really want a motherboard supporting an FSB of 1600mhz (i.e. upping it to 400 in BIOS) and since the vast majority of boards require you to OC to reach that FSB (except some X38 boards i think), higher RAM speed can only be justified if you plan to knock on 4Ghz territory.

...i think..

Edit: i'm wrong, completely wrong, ignore me :)
 
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I see,hmm that is interesting.

Seems on high overclocks it will need to be looked at in some form, if it's like a fail-safe setting.

I'm confused as to why anyone would want to put down the CPU multiplier though, surely that means a higher FSB needed, meaning lower OC.
 
Hmm will test that. First things first though, auto seems to have put my vcore at 1.41v with just a 333mhz fsb, gonna try whacking that down a couple of notches.
 
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