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Why do only *incremental* overclocking changes work for me?

D

dderidex

Supreme [H]ardness
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Oct 31, 2001
Messages
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System in sig.

Odd problem with this mobo. If I take it from 'stock' and set the HTT clock to 250mhz in the BIOS...it won't POST. Won't warm or cold boot. From where it is "now" - 233mhz HTT clock, if I set it to 250mhz....still won't POST.

If I set it to 240mhz, though (which I can do even from the stock BIOS-cleared settings), it works fine. And if I boot at 240mhz, and enter the BIOS, I can change the clock right to 250mhz with no problems. Indeed, all the way to 260mhz seems to work.

Until I shut the system *down* again, anyway. It won't cold boot at anything past 240mhz HTT clock. But once I've made that jump from 'something' to 240mhz HTT...the sky is the limit from there.

I've seen this problem mentioned before with other motherboards - is there any "known" cause to this or solution? Since I'm on an ATI Xpress200 motherboard, there are no clock generation tools I can use from inside Windows - what the BIOS can set the clock speeds to is all I can use.
 
I should add that CPU and memory clock does not matter. With a 250mhz HTT, I can set the CPU at an 8x multiplier (for 2.0ghz on a stock 2.2ghz CPU) and the memory with any of the dividers, including those that take it under DDR400 (PC3200) spec. No difference - can only hit 240mhz HTT on a cold boot, but can change it to higher numbers from there.
 
0mega said:
set the ht link multiplier to 3 and try again
Click to expand...
That is not an option.

Besides, it works at 5x 200mhz = 1ghz, so why wouldn't it work at 4x 250mhz = 1ghz?

And, in any case, it *does* work at 4x 250mhz...after I've booted it up once at 4x 240mhz.
 
I am kinda new to all this ocing stuffs, but my motherboard has a cpu volt boot setting,(dfi lanparty ut ultra-d) maybe you need that upped a little, on a cold boot maybe its not posting cause you need more power perhaps at the clocks you trying to run at.. could be way off, but it was something I read about just last night :)
 
All my voltage setting options are as high as they will go (which isn't saying THAT much).

I'll see what can be done about getting a BIOS that allows a 3x HTT multiplier...but I'm not holding my breath, I'm afraid...
 
ryuji said:
iirc a lot of ppl have issues with ht higher then 800
Click to expand...

Well, that's mainly NForce3, but that can usually handle up to about 1000MHz. The NF4's can handle a little more, but the ATi chipset is another thing entirely...but the LDT really isn't that vital to performance. The least you can do is try 3x, and try to cool boot 250MHz. If it works, then that's the problem...if not, then bring the LDT speed back up. ;) Either that or get an NForce board. |||||||||*Anti Flame Barrier*||||||||| :D
 
No nForce4 boards with any overclocking options in mATX form factor. :(
 
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