No 4:5 cpu/ram ratio on Gigabyte GA-8IGX

[frankc]

Hardware:
CPU - Intel 1.8A
Mobo - Gigabyte GA-8IGX rev 1.1 with latest BIOS (ver <F5>)
RAM - 256Mb 333MHz DDR PC2700 Kingston DIMM CL2.5

Unable to achieve 333 MHz for DDR ram while o/c FSB to 133 MHz due to non existing 4:5 cpu/ram ratio in BIOS. Only 3:4 ratio exists which o/c ram up to 354 MHz causing system instability (even with bumping up voltage levels on cpu & ram).

Would like to run at FSB 133 MHz which would give cpu speed of 2.4 GHz. Have to settle for FSB 125MHz to get ram up to 333 MHz, but cpu only at 2.25 GHz.

Anyone have this problem, please help?

 

[Tummy]

I have an 8igx as well but I have the right multiplier. If you set fsb to 133, use 2.5* and that should give you 166.

However, I have another problem where when I use 2 256mb dimms in the board, I cannot run any non-standard fsb speed for the ram. e.g. ram @ 335 crashes, ram at 268 crashes, etc. etc. But ram right at 333 is fine and ram at 266 is still fine. If i take out one dimm, and only use 1x256, I can run at 350ram fsb without any problems at all. Seems to be to be bad motherboard design or maybe a bios, i don't know which but it's quite frustrating.

 

[MadTom]

Hi,

I've the following:
P41.6A
8IGX with F5
2x Kingmax 256MB DDR333 CL2.5

Unfortunately I ran into the same problem - and now the reason (doesn't help us...)

When you put a 400MHz based processor in the board (1.6A, 1.8A...) then only the 3:4 setting is offered in BIOS (in fact 2.0 and 2.66), but when using a 533MHz based processor (2.26, 2.53...) then the MB automatically gives the 4:5 option what would corespond to a 333 MHz for the memory...

And - having same problems as Tummy when using 2 memory sticks (however, it seems that one is not working like it should as it gives lockups even when running "normally" at 266MHz and with slowest memory timings). Will try to change the other one.

Something that maybe will help you: when OCing the BUS to 133 the system was less stable then when OCing it to 135 MHz. Of course I used then 270 MHz for the memory. For now it seems more stable (but only with one stick of RAM).

However, I'm not very happy with this MB, and hope that somebody will give us a tweaked BIOS which will open new memory settings.

 

[MadTom]

Update, update

I changed my RAM from 2xKingmax DDR333 256MB to one stick of Samsung 512MB PC2700 (DDR333) RAM and everything works flawlessly now even at 354MHz on the RAM with 2-5-3-3 settings.

Happy OC'ing