Trouble With FSB Speed on a MSI 6337 (815e Pro)

[Wedesdo]

I am having trouble adjusting the FSB with the jumpers on the MSI 6337.

The MSI 6337 lets you select the basic bus speeds (66, 100, 133) with jumpers on the motherboard, and then you can adjust in the BIOS the FSB+33Mhz.

However, when I change the FSB speed using the jumpers, it won't even boot at all! Even when I change it from 100Mhz (the correct speed) to 66 Mhz!

I changed the FSB in the BIOS to 132 Mhz (the highest it will go on a base FSB of 100Mhz), and the system booted fine. However, that wasn't stable because the system kept a FSBCI of 3:1.

Everyone who had the board overclocked fine. Any advice?

System config:

PIII 700 cB0 (924Mhz at 1.75V fine)
128 PC133 RAM
Elsa Gladiac (also tried 815e onboard video)
Quantum Fireball LM 7200RPM 30.0 GB HDD.

Nothing else.

Any ideas?

 

[Ulysses]

I don't think there's anything wrong with the jumpers - it's the CPU, stupid.

Just a joke !! Sorry.

Now seriously:

1. That's a very nice. board. See http://www.anandtech.com/showdoc.html?i=1291&p=11 and

http://www.anandtech.com/showdoc.html?i=1291&p=16.

2. Since that CPU is meant for a 100 MHz FSB, if it is not stable at 133 MHz, then you have no choice but to knock it back to 100 MHz system bus and then start bumping it up until it becomes unstable, then back it off some. Which is what you've done, more or less.

3. I don't believe you can set the FSB to 100 and the memory bus to 133 on that board - that combo is not permitted by the chipset, I believe. You can only use 133 and 133, or 133 and 100, or 100 and 100 - but not 100 and 133.

4. Also check that the CAS/RAS BIOS setting are not too low (maybe use 3-3-3 rather than 2-2-2) to cause instability.

 

[Wedesdo]

But I also can't set it from 100 Mhz to 66 Mhz - and the cpu runs fine at 132 Mhz FSB.