Northwood default FSB pin info needed.

[garyboz]

Hi, I have a 2.0A Northwood in a Compaq. I'd like to attempt to overclock this by covering the correct BSEL pin to change the default FSB from 100 to 133. However, the only info I can find on this relates to Xeons. I've read this Intel.

It seems to imply that I need to cover the BSEL0 AD6 Pin but I can't find a diagram showing me where this is. Can some one give me a link or any more info? Thanks.

 

[Jen]

i dont know if the 2.0a will oc to 133 bus , isnt that a 20 multiplier? 20x133 is a big overclock



Jen

 

[BigBadBiologist]

I've been looking for the same thing. I found an article in German once but the translated version didn't make a whole lot of sense. I'll try to get back to you with a link.

But like Jen said, the 2.0 may not go to 2.66. I had one that maxed out at about 2.3.

 

[BigBadBiologist]

OK, here's the link:
http://www.tualatin.de/phpbb/viewtopic.php?p=96720

get your translator out!

 

[garyboz]

Great! Thanks, this is just what I needed!

 

[nomailforjeff]

Check out this site (in English!):
http://207.215.129.246/computer/fsbpinmod.html#478

I have done this mod to 2 Cellies - a 2.0GHz and a 2.2 GHz. Both 400MHz FSB -> 533MHZ went without a hitch. Stable at 2.66GHz and 3.0GHz on air.

This site used wire wrap insulation (I used this technique, just in case I needed to undo it):
http://www.ctechnet.com/hardware/Asus/PC-DL/xeon603_pin_mod.htm
Note this article deals with Xeons, which have a different pinout than a 478 CPU.
The BSEL0/BSEL1 table is the same for both chips though.

Also be careful when reading the pinout maps- THEY ARE TYPICALLY SHOWN 'FROM THE TOP - LIKE LOOKING THROUGH THE CHIP AT THE PINS'. Also called the SOCKET pinout.

 

[garyboz]

Wow, thanks for making your first post just to help answer my question. Did you cover the pin or break it off. I'm going to try using the wire wrap from an 80pin IDE cable. Is that/what did you use. Thanks.

 

[nomailforjeff]

I used the teflon insulator from a strand of wire wrap (just like the site for the Xeon did). This stuff is WAY thinner than 40 pin IDE cable, and thinner than an 80 pin IDE cable.

Wire wrap is used for prototyping electronic circuits. The stuff is common in 30, 28 and 26 gauge. Thicker than a human hair, but not by a whole lot. I had to widen the hole a bit with a needle to fit it on the BSEL0 pin.

Using the wire wrap insulator, I had to press slightly to seat the chip. If the insulator were much thicker I would have a bit of trouble.

Remember to read the pinout maps very carefully. Make sure you use a pin side map, not a socket view map, to avoid confusion.

Now get that thing up and folding proteins.

 

[rogue1979]

I used a pair of needle tweezers and gently bent back and forth. It broke off easily without bending any other pins.

 

[Mingon]

get a decent retractable pencil and use the end is the best way I found