Increasing FSB Frequency on Intel XBX2 MOtherboard

[wwswimming]

I have been trying to find the menu where you set the FSB frequency.

What I'm trying to do is, for example, increase 200 to 220, for a 10% overclock.

But I can't find the menu that has the place where you change the frequency.

I've found it on other motherboards, but I can not find it on the XBX2.

So I'm asking for Anandtech's help !

I'm tring to OC the Intel 975XBX2 motherboard. I've got a tower heat sink on the E6850 CPU, second generation Conroe. It's got this great heat sink but it's just sitting at stock !
http://www.intel.com/support/motherboards/desktop/d975xbx2/sb/CS-029346.htm

BIOS Screenshots -

Where do you change the FSB frequency ?

 

[lopri]

"Host Clock Frequency Override" in the second screenshot. Read the description on the wing once it's highlighted. If I remember correctly, you use '+' and '-' keys to adjust the FSB.

And "Reference Frequency" in the first screenshot lets you select straps. (Be careful with that because it will return the value to default at every failed OC attempt)

 

[lopri]

1.525V for MCH is waaaaayyy too high, BTW. For dual-core CPUs and two memory sticks, the default 1.40V should suffice for within-strap overclocks. (e.g. 200 FSB CPU up to 333FSB, 266 FSB CPU up to 400FSB, etc.)

 

[wwswimming]

1.525V for MCH is waaaaayyy too high, BTW. For dual-core CPUs and two memory sticks, the default 1.40V should suffice for within-strap overclocks. (e.g. 200 FSB CPU up to 333FSB, 266 FSB CPU up to 400FSB, etc.)

thanks a lot !

i got the OC. the "+" key on my keyboard won't affect it (the freq setting) - but the "+" key on the numpade will.

it defaults to 9 x 266 when you open it up.

also, one thing that's wierd is, the supposedly new version of CPU-z that i'm running is saying the computer runs at 2 GHz. 'System' says it runs at 3 GHz.

so, to see how fast it's going, i have to do a rendering, and compare rendering times on the same file. i'm using a simple particle simulation/ rendering in Blender.

sure enough, @ 3.6 GHz (9 x 400) the batch took about 40 minutes. (used to be an hour).

finally got my OC on the E6850 !

but it's wierd - it will NOT take 4 GB of RAM. someone with a 975XXB2 suggested bumping the ram voltage, from 1.39 to 1.42, so i did, which worked for about a day. then it just wouldn't boot (using Mushkin Blackline 2 x 2 GB.) i also tried Mushkin Silverline 4 x 1 GB - no boot.

i don't mean "no boot" with the OC - i mean no boot AT STOCK. darn motherboard won't take more than 2 x 1 GB (it like G. Skill).

OH YEAH - about the MCH. won't go lower than 1.500V. so i just left it at 1.525. i don't know if that's an idiosynchrasy of XBX2's or what.

 

[slag]

I love my bad axe 2 motherboard. Granted, the quad core cpu's you can use are slim pickins and there is no 1333 bus speed, but for stability, its great.

I have an E4300 1.8 ghz chip running at 3.33 ghz, stable 24x7 with 4 gb of OCZ ram.

 

[wwswimming]

anyway, THANKS for the help !

the BadAxe got up to 4.5 with a 3 GHz CPU (the E6850). stable - i do a test render in Blender to see the effect on render speed.

my first 50% OC ever !

i backed it off to 4.2 for "just sitting around". took me 2 years to figure the darn thing out - with AT's help !