A7N8X Deluxe - Problem with FSB above 133

Speedo

Senior member
Jan 12, 2000
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I have just updated my A7N8X Deluxe rev 1.04 to the latest 1004 bios, and now I can't run the FSB nearly as high. With my old 1002, I ran at 175MHz, no prob, but with this new 1004 I can only go a few MHz above 166?! Anyone else experienced this? What could be wrong?

I'm using 1GB Corsair DDR333 RAM, and I just moved from a 1700+ T-bred to a 2500+ barton.

Thanks!

 

mechBgon

Super Moderator<br>Elite Member
Oct 31, 1999
30,699
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Did you remember to re-lock the AGP bus, bump your memory voltage a little and manually set the memory timings?
 

Speedo

Senior member
Jan 12, 2000
492
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Ehh... what? I must have been absent from the hardware community too long ;)

First of all, what is "re-lock" the agp bus?? Never heard of it...

Also, why must I bump the memory voltage compared to the 1002 bios? Actually I tried bumping it one step, but it didn't help... And memory settings; I've tried both "optimal" and "agressive".
 

Speedo

Senior member
Jan 12, 2000
492
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Damned... this is getting more and more wierd.

I forgot to mention that I actually have two identical systems here, except for the CPU.

System #1: In my own computer I updated the bios 1002 --> 1004 at the same time i switched my (for some reason) dead 1700+, for a 2500+ barton. I emidiately noticed that I could not run at 173 FSB, which I had done ever since I built this computer a few months ago. Tried flashing back to 1002, but I'm still stuck at just above 166MHz bus.

System #2: Built this system for my friend, and he has been running his 2400+ at default speed, and 133 FSB (actually the memory has been underclocked). So, stupid as I was, I updated to the latest bios 1004 on his (just after I flashed mine) computer, _before_ I started experiment with max atainable FSB. I was surprised to see that anything above 170 FSB was very unstable, and it didn't even load windows. This was actually before I started testing out the limits of my own computer. Now I have gradually lowered both the FSB and multiplier on this computer, and I just found out that it's not even stable at 166FSB and default speed on the CPU?!

Oh, and the memory in both machines are 2x512MB Crucial.

I have been building computers for years, and have always overclocked etc, but this time I'm really lost. I don't understand what's going on here.... please help me!

 

Speedo

Senior member
Jan 12, 2000
492
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Anyone? Please help out a lost soul here... ;)

I'm beginning to wonder if the memory in my friends computer is simply "bad". What ever I do, I can't even get it to run stable at 166FSB, even with lowered multiplier so that the CPU is running at default speed.
 

MARMADUKE

Banned
Nov 24, 2002
835
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2x512MB Crucial.
This memory has always had problems running on the nforce2, last year when people first got the nforce2 mobos everybody with crucial and kingston and lots of corsair had to RMA there ram and get TwinMOS,Buffalo,Mushkin..You know!..stuff that works!
 

toastyghost

Senior member
Jan 11, 2003
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I will speculate that the official support for 400 FSB Bartons caused a recognition and/or stability problem. I run a 1700+ TBred-A w/ 400 bus and something very similar happened to me with 1004 official, but I got 1004 uber and it worked fine again.
 

Speedo

Senior member
Jan 12, 2000
492
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Originally posted by: toastyghost
something very similar happened to me with 1004 official, but I got 1004 uber and it worked fine again.

Wow... sounds interesting... "uber" ? What's that? beta? Where do I find it?
 

magomago

Lifer
Sep 28, 2002
10,973
14
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the a7n8x has a problem with crucial sticks? i have a 1700+ at 10.5*!66 (its a Tbred A hence the lower oc'ing potential) and I has 2x256 of crucial pc2700 and I haven't had any of tthose problems