Iwill kk266 and changing the FSB

[TruculentTucan]

I was told to change the FSB on my Iwill I needed to first change the jumper from 100 to 133, and then clear the CMOS. It then should boot and POST. This doesn't happen. It goes on, but never POSTs. I think it tries to run at 130*12 because 12 is the default multiplier and, after changing the jumper, 130 is the default FSB. Any ideas? Am I doing something wrong?


Thanks,
Beau

 

[Homer]

You're going to have to get the multiplier down to a level at which you can do the initial boot before the bios kicks in and resets it to the setting you have chosen, (or subsequently choose). For starters have you read through the relevant bits of this article? There are other guides on how to do this at various sites. Probably some multiplier like 8, giving you a speed similar to your CPU's rating. No reason why you couldn't go lower than that. I think you are now going to learn about pencils and rear window defogger repair kits & stuff like that...

Here's another good guide.

 

[ErikaeanLogic]

If you have the L6 bridges set to a default multiplier, then I'll assume either you pencilled in the bridges to create the 12 multiplier or you've got a 1.2GHz "B" Thunderbird. If you created the 12 multiplier, chances are that you can simply change the multiplier to a significantly lower value(I usually use 7.5 or 10, depending on the cpu stock speed). If, however, you've got a cpu with a stock multiplier of 12, then the lowest you can pencil in is 11; that's just the limitation of the already-crossed bridges. Short of cutting a bridge(not recommended!), you'd have to live with a multiplier of 11. Refer to this chart to see what I mean; the column you want is the L6 column.

Why is this important? When a cpu enters POST, it temporarily uses hardware default values to determine its speed; 133fsb times 12 multiplier = 1600MHz! Once the system loads the BIOS settings(usually a few milliseconds into POST, I think) the cpu will be run by the BIOS values you set. The trick, of course, is to get your cpu to POST, right? Even if you had the "worst-case" scenario here and had the stock multiplier of 12, you could reduce it to 11, which makes your POST speed 1466MHz(11x133 vs. 12x133), still pretty high but much more attainable than 1600MHz, IMHO.

 

[TruculentTucan]

thanks guys, you have been a big help.... *gulp* it's time to see what's up with my CPU

 

[kgraeme]

In your first post you say "change the jumper from 100 to 133, and then clear the CMOS." This is the wrong. And you are right in assuming that it's trying to run at the default multiplier, that's because you reset the CMOS. So your 1.2 is trying to be a 1.6 (1596MHz).

Basic procedure:

1. Make sure your CPU is unlocked (L1 bridges all filled in. Since it's a 1.2 it should be.)
2. While at 100 MHz FSB go into the BIOS and change the multiplier to 9x.
3. Leave the BIOS FSB at 100.
4. Make sure the ram is NOT running at Host Clock +33.
5. Shut down.
6. Move the FSB jumper to the 133 position.
7. Restart and pray.

The praying shouldn't be too important because it should all work fine. What to do if it didn't work:

8. Set the FSB jumper back to 100 and restart.
9. If it boots up, set the multiplier lower and try again.
9a. If it doesn't boot up, now you can clear the CMOS to reset everything.
10. If after fiddling with the multiplier without results, try raising the voltage to 1.85 to give it a kickstart. (You will need to close the L7 bridges to modify the voltage.)
11. If all that fails THEN try the L6 bridges.

If you're trying to overclock, then you probably already know what bridges are what, but just to recap:

L1 = FSB
L6 = Multiplier
L7 = Voltage

The guide to modifying L6 bridges.