why can't I get 133?

[Lance95113]

I just got my Epox 8kta3 installed with a 900 t-bird. Runs great. When I set the jumper on the mobo to 133 it won't boot and gives me a post code that says "auto detection of onboard dram and cache". The mobo automatically sets the dram to 133 when the jumper is at 133. Any thoughts whats wrong here?

 

[PassatVR6]

I had the same problem, but DaddyG helped me out and I learned how to fix this.
First of all when you first boot up, the computer is booting off the CPU's hardlocked multiplier until it reaches the BIOS. From there, the BIOS takes over and uses the multiplier set in the BIOS.

NOW, since you have a 900, the computer is initially trying to boot up at 9X133 = 1200 which is too high ( i have an 850 and it wasnt working)

To get around this, u need to bridge some jumpers on the CPU.

connect all the L1 bridges to unlock the CPU
connect all the L7 bridges to set default voltage to 1.85V
then set the L6 bridge to a lower Multiplier (u can find out the correct settings in the Athlon Overclocking guide)

reset the bios to default settings, shut down set the jumper to 133 then bootup and youre done! then go tweak the Bios how u want it .

-Matt

 

[Bad Dude]

Can I do this with the KT7-RAID or must you have the KT7a?

 

[Insane3D]

PassatVR6:

I have have some discussion with DaddyG about this, but I still don't think it always uses the hard locked multiplier first. I have a 1.2ghz on a KT7A-RAID, and I lowered the multiplier to 9 and raised the FSB to 150mhz. I also lowered the voltage to 1.7v from 1.75v. If what DaddyG said was true, that would mean that for a split second I would be booting at 12X150 @ 1.7v..that would be 1.8ghz and I would never be able to boot by DaddyG's theory. Abit's BIOS may differ in how it changes the multiplier from other manufacturers bios..but I am not sure.

Bad_Dude:

You would need a KT133A board like the KT7A..the KT133 chipset will not go much over 110mhz.

 

[gtd2000]

I've had problems with my Duron 700 on my KT7A - I can run at upto 1000Mhz and even post at 1050Mhz - but using the 133FSB I get unpredictable results.

I can run 3DMark2000 many times without problem at 866/933/1000Mhz (133FSB) but suddenly in windows it will re-boot?

I even tried running at 733Mhz and it was fine - but then suddenly rebooted during mp3 playback?

I was playing CS at 1000Mhz (100FSB) the other night no problem whatsoever?

Very inconsistent so far..;-(

733Mhz should be trouble free - unless the pencil trick is what's holding me back?

 

[Bad Dude]

So why all the higher settings for the FSB? Is this just to fool people?

 

[gtd2000]

I'm running perfectly at 850Mhz right now...well so far..

Not sure why it (the board?) dislikes the higher FSB settings...maybe it's my CPU?

Current temps are CPU 39C, System 33C...pretty cool for this area.

I'll get to the bottom of it soon

I hope!

I'll try running for a day or so at 100FSB and see what happens,I'm using Micron PC133 RAM so that shoudl not be a problem.

Sisoft Sandra Millenium keeps telling me that my AGP slot is running at 100Mhz though? and that my PCI/ISA slots are too high also?

But I'm using 133/33 with 133FSB settings?!?!?!

 

[PassatVR6]

Insane3d, it may very well be different for your motherboard, but for my EPOX it refused to boot at 133bus until I changed the L6 bridges on the CPU to a lower jumper setting.

I even tried setting the BIOS jumper down to 7 then shutting down, switching the jumper on the motherboard to 133bus and it wouldnt boot.

But, after I did what DaddyG told me (bridge all L7's for 1.85V on boot, and bridged my L6's to a multiplier of 7) it booted up perfectly at 133 bus.

-Matt

 

[DaddyG]

Insane3D, you are absolutely correct that all mobos don't initialize the cpu and chipset in the same manner BUT ABIT users are having the same problems, and the same solution works. Even though I don't like ABIT for quality reasons, they are the KING of BIOS overclocking. The simple facts remain undisputed, BIOS values are stored in CMOS memory, they must be READ from memory using CPU cycles and the values stored in hardware registers or other means to change the built in defaults. These instructions are executed at some default values which certainly appear to be effected by the L6 bridges for multiplier and L7 for the voltage. I do believe that the 133 option on the ABIT mobo is a BIOS setting, not a jumper like the other mobos, therefore on the ABIT mobo, it could initialize at a default of 100 with a 'B' type cpu.

 

[gtd2000]

I've borrowed another Duron 700 and running at 933Mhz right now..who knows if it will keep going....
Will post back here after the weekend. ;-)