Why does my ABIT KT7A and Duron 700Mhz not like the 133FSB???

[gtd2000]

I've had my new system for almost a week now and in that time I've had my system running perfectly all the way from 700 to 1000Mhz. Trouble is that when I choose to use the 133FSB settings 733, 800, 866, 933 and 1000 I get random re-boots. Even when upping the volts to 1.85v

I have had the PC running stable at 750 and 800Mhz with default 1.60v using 100FSB - why does it not like the 133FSB setting?

I'm using 2 x 128MB Micron PC133 RAM that worked at CAS2 settings on my old PIII450@600Mhz/Abit BX6 2.0 - so RAM "should not" be the problem?

I'm slowly increasing my operating Mhz so that I know that it is stable at a given frequency - surely it should not matter whether I run my CPU @ 800Mhz using 8 x 100FSB or 6 x 133FSB?

Any ideas?

 

[gtd2000]

I've just played 2 rounds of Counterstrike @ 840Mhz using the 140FSB and it's solid so far.... weird stuff
That is at default volts too

 

[gRoUnD]

....you scared me man.I´m buying this MB and the Duron 700 because i want to play around with 133 MHz FSB.I hope i´ll get a Duron that manages 133 MHz....

 

[gtd2000]

It's really weird - because after being stable at 140FSB I then thought what the hell, lets drop it back down to 133FSB and play some CS at 800Mhz played one mission and then the system hung

I'm at 800Mhz with 100FSB yet again and I've just played a complete round of De Dust and it was fine....maybe my board just does not like the 133FSB???

 

[gtd2000]

I've just e-mailed Abit to see if I get any response....

 

[vexter]

I bet thats a duron if so ive heard they dont like high bus speeds. Just go for the multiplier or an athlon

 

[gtd2000]

I wish people would actually read the previous info :frown:

I've mentioned earlier that it runs perfectly stable at 840Mhz using the 140FSB if the Duron did not want to run at "higher" FSB's then it would not run at 140Mhz presumably?

I have a feeling you may be confusing the higher FSB overclocking problems with the Thunderbirds though. I've read the opposite that the Durons are better for overclocking with higher FSB's... I may be misinformed though.

Still running stable at 800Mhz with 100FSB

 

[kimber]

i believe i,ve read other places that were finding certain multipliers that there system didnt like regardless of speed but this is the first i've heard of at a certain mhz.did you try running a higher multiplyer at 140mhz?

 

[gtd2000]

I seem to be able to run the CPU at any multiplyer with the 100FSB - I'll do a few tests with higher and lower than 133FSB. I'm just more concerned with all my other bits and pieces running within spec.
Strangely Sisoft Sandra said my AGP was running at 100Mhz when using the 133FSB setting - am I missing the AGP divider somewhere. I don't see it in the BIOS?

 

[SuperKen!]

It has something to do with KT7A with a AMD CPU running around 1GHz operation. If you do that, you will get random re-boots, and sometimes your system wont POST.

 

[006agent]

don't set the fsb manually...
select host and pci clock

 

[gtd2000]

<< It has something to do with KT7A with a AMD CPU running around 1GHz operation. If you do that, you will get random re-boots, and sometimes your system wont POST >>



This is at 733, 800, 866, 933 etc...is that &quot;around&quot; 1Ghz?



<< don't set the fsb manually... >>

- I'm not sure I follow? I'm setting the FSB in the BIOS

Am I missing something here?

 

[gtd2000]

When I choose the 133FSB it's the next choice down from the 100FSB setting - is this the wrong one?

 

[DarkMajiq]

Probably not your problem, but make sure your RAM isn't operating at 166MHz or something when you're at 133

If it's stable at 7x140=840 though, why not just run it at that, or try a higher multipler with the 140 FSB?

 

[bhess]

make sur that you are trying it at 133/33 the 33 being the pci speed. I don't know why but it has a 133/44 (I think it was 44) setting. I hava a t-bird with the same mobo and ram. It runs at 100 133 and 150.

 

[gtd2000]

Yes using the 133 with 33 option

 

[gtd2000]

Latest update:
I'm back to 800Mhz @ 100FSB
Tried underclocking the CPU with 5 x 133 = 667Mhz - guess what - re-booted after about 2 mins!!!
Must be the CPU does not like that 133FSB setting?

 

[DigitalWolf]

Greets,

Not sure why you can't stay good on a 133 bus. My TBird runs at 133/33 no probs. Now a few things.

At 133 there is no chance his memory is at 166... becase you can't run memory at hstclk+pciclk at 133 bus. Over like 120something bus on the Abit KT7A/KT7A Raid that option is removed. Its like 122 or some MHz bus that its removed. So whatever FSB you run is what your memory is set at.

I have seen lots of posts on other message boards about Durons on various motherboards not running stable on a 133MHz bus but they WILL run stable on 140MHz bus or other odd speeds.

My 900TBird I've only run at 7.5x133 (default voltage) and 7.5x140 (1.775Vcore) so far.

While I was running at 7.5x133 (um around a gig).. Which I did for over 2 weeks. I never had a reboot... posted every time. No problems at all. Great system.

I will push for more later when I have a video card that can give me more benefit from the MHz. I also need to buy another hard drive and backup all my data. I'm somewhat shy about pushing the FSB into the 150'ish range.

Anyway sorry I couldn't solve your 133FSB issue... I'm really not sure why you can't get it stable.

-DW

*** EDIT for spelling and probably missed some still ***

 

[gtd2000]

Digital Wolf,


<< I have seen lots of posts on other message boards about Durons on various motherboards not running stable on a 133MHz bus but they WILL run stable on 140MHz bus or other odd speeds. >>



Thanks for your response - this may suggest that there is a problem with that particular FSB then?
I hope thats only with a Duron that is designed for 100FSB?

Oh well I have a 2 year warranty

When a 1.2Ghz Duron with 133FSB is the same price as the Duron 700 I'll get one of those

Actually I'm running at 800Mhz right now at default volts and for the &quot;real difference&quot; in performance it's no big deal really - and certainly not worth the hassle of the re-boots - only disappointing that I don't have those magical free extra Mhz

 

[DigitalWolf]

Greets,

Its one of those weird computer things.

Quite a few people can run that FSB with NO problem. While others can't.

Just like quite a few of the other problem you might see. Like IRQ problems or USB problems. I see people with IRQ and USB problems with almost the exact same setup as me. I've never had either issue.

Just weird stuff that can't be explained... or maybe in can 'quality control' (?)

-DW

 

[Fingers]

on some review I read, they said that the 133 mhz FSB won't be stable unless you can get your cpu to run at 1 Ghz or better. this might be the problem. It has something to do with the fact that no 133 mhz FSB athlons were made below 1ghz and the chipsets werent designed to run 133 mhz fsb below 1 ghz. hope this helps.

 

[kbar]

Hi,

Just wanted to let you know I also have the exact same problem with 800 Mhz duron. Works ok (still crashes infrequently- blue screen everytime I alt-tab from in Giants) at 8x 100, but just won't work at 6x133. It always POSTS, and crashes somewhere in intital windows boot up stage. I also tried 5x133, still crashes. Thanks for the tip about 140Mhz FSB, I'm going to give that a try.

 

[Mean MrMustard]

Dude, gtd2000, if you can get it up to 140 and still be stable, why are you complaining that it won't run at 133? Just keep it at 140.

 

[gtd2000]

I'm actually perfectly happy with it at 800Mhz (I keep saying this - but not as happy as I would be at 1000Mhz with 133FSB...lol) - just moved up from a PIII450@600 on a BX6 2.0 which was in my opinion slighly faster through the windows screens etc - My Computer, Control Panel etc etc.
Maybe thats just the effect of the 133FSB?
The Duron opens application noticeably faster though
However many of my friends did comment that my old system was very fast

The 133FSB setting on this system does give it back some extra &quot;snap&quot; but the unpredictable re-boot just makes it worthless

Elp,
The reason I'd like to use the 133FSB as opposed to the 140FSB is because I'd like to run everything bar the CPU within spec for a change
Also as strange as this sounds I don't like the sound of 840Mhz - 850Mhz yes but 840 - not quite a nice number LOL

 

[gtd2000]

Back again...new approach - running at 740Mhz with 140FSB to see if it is &quot;totally&quot; stable, will leave it like that for say the next few days to see how it goes

I'm going low to be sure that it's the 140FSB that's stable as opposed to perhaps the CPU getting flakey.

The strange thing about my 133FSB setting was that I managed so many 3DMark2000 benchmarks and it never missed a beat - even at 1000Mhz. It's just in Windows I seem to get the problem - and of course Counterstrike.

OK I'll update later....