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PCIe link width sticking to 1x (and randomly giving 16x)

post #1 of 9
Thread Starter 
Hello there !

I've bought a new rig some weeks ago, and it was rather smooth (check sig for details).
Last week, on the advice of a friend much more in-the-know than me, I've set the FSB to 333.
Then again: smooth.

Later on that week, I've set 375 (no voltage change involved), and it was also nice.
Then I added DRAM@938 (and voltage to 2.15) to that setting, and that was also nice.

Yesterday, when I asked my friend what the next step might be, he told that trying 400 should be more than safe, so that's what I did (vcore@1.35 and DRAM@800, still 2.15v).
But at some point I was getting choppy graphics.
It was clearly visible when running 3DMarks, since on the very few seconds of the very first scene, where I was usually around 70fps, now I was at 20 .

I then tried different settings, to figure out where was the problem.
That was the occasion to see that my system easily gets unstable, but I guess that will be another story/thread.

On-topic then, I finally pinpointed what was causing all that ruckus !
You bet, the damn PCIe link width was at 1x !!!

That's when I tell to myself "easy, now I just need to find the setting to lock it to 16x"... easier said than done.
Googled it, but mostly found about people having plug they're GC on the wrong slot of their SLI mobo... which of course doesn't apply to me.

So, fellow overclockers, is such a locking possible, or is my mobo ****ed up at some point (that's when I mention that my onboard sound chip tend to "crackle" -don't know how to say that, but it a damn annoying shredding noise- when there's much volume, even though system's and speakers' volume is medium) ?

PS: sorry for the long post and the numerous gibberish, I guess I really need to sleep now
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post #2 of 9
either downclock your FSB to when it was stable.. like 375MHz and see if that fixes it.

if so, you are sucking your Northbridge dry of power probably.. you might want to nudge the MCP voltage up a hair.. if resetting to lower FSB or stock settings doesnt fix it, you may have sparked soemthing up.

a price we all pay for being greedy for a couple more clock cycles.
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post #3 of 9
Thread Starter 
I just tried again: 375, dram@750, voltages set on auto.
First boot: 16x, yeah !
Second boot: 1x, nay !

So I guess there's no way so lock that link width ?

(Excuse my noobiness, but what is "MCP voltage" ? I can't find that in my bios)
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post #4 of 9
Quote:
Originally Posted by British View Post
Hello there !

I've bought a new rig some weeks ago, and it was rather smooth (check sig for details).
Last week, on the advice of a friend much more in-the-know than me, I've set the FSB to 333.
Then again: smooth.

Later on that week, I've set 375 (no voltage change involved), and it was also nice.
Then I added DRAM@938 (and voltage to 2.15) to that setting, and that was also nice.

Yesterday, when I asked my friend what the next step might be, he told that trying 400 should be more than safe, so that's what I did (vcore@1.35 and DRAM@800, still 2.15v).
But at some point I was getting choppy graphics.
It was clearly visible when running 3DMarks, since on the very few seconds of the very first scene, where I was usually around 70fps, now I was at 20 .

I then tried different settings, to figure out where was the problem.
That was the occasion to see that my system easily gets unstable, but I guess that will be another story/thread.

On-topic then, I finally pinpointed what was causing all that ruckus !
You bet, the damn PCIe link width was at 1x !!!

That's when I tell to myself "easy, now I just need to find the setting to lock it to 16x"... easier said than done.
Googled it, but mostly found about people having plug they're GC on the wrong slot of their SLI mobo... which of course doesn't apply to me.

So, fellow overclockers, is such a locking possible, or is my mobo ****ed up at some point (that's when I mention that my onboard sound chip tend to "crackle" -don't know how to say that, but it a damn annoying shredding noise- when there's much volume, even though system's and speakers' volume is medium) ?

PS: sorry for the long post and the numerous gibberish, I guess I really need to sleep now
The crackling is usually IDE activity and I know pretty much what your trying to say it sounds like. A sort of low buzzing then it fluctuates between being slightly higher and louder.

Powerstrip can let you assign more bandwidth to your sound card and that should help. However theres only so much it can help with, and if your using onboard sound, forget about ever achieving crystal clear sound without switching to a dedicated card!
    
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post #5 of 9
Thread Starter 
Actually it's not a buzzing in the way I understand that word...
Since I don't know how to explain it properly, I'll give a couple examples:
- I'm a WoW player, and if you know about it, when you are getting resurrected of buffed, the sound volume of those actions goes higher than the regular soundtrack... that's when it tears my ears: acute burst of sounds.
- Same goes for FEAR:Combat when there's too many fights in my vinicity, moreso when there's grenades flying.

But I guess that's not much of an issue, I'll just have to plug back my Audigy ZS. I removed it 'cause I was thinking ahead for Vista, but it seems that maybe it will be supported at some point...
Still, onboard audio chipsets are supposed to get better and better...


Back to my PCIe link width problem, I've done 6 reboots on stock conditions, and so far it's 100% 16x, so I'm kinda relieved.
But I didn't bought a e6600 to keep it stock ^^
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post #6 of 9
British.. sounds like your Chipset isnt getting the juice at OC.. thats the MCP.. or the northbridge. Not sure what your MoBo will call it. But it's the PCI-E Controller.. northbridge whatever.

That needs the voltage boosted a touch, then try again.
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post #7 of 9
Thread Starter 
ATM I have: FSB@400/1.4v, DRAM@800/2.15, NB@1.25v and it's quite stable...and more important, the 16x seems to stay :]
So thank you all for the help !

But I'd like to push that a bit further, and am a bit concerned about how far I can push those voltages without breaking something.
Maybe I should do a new topic for that, though ^^
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post #8 of 9
The problem you are talking about, only seems to happen around the upper end of the NB boot straps....high 300's, high 400's. For some reason, switching a custom set voltage on the NB-> to auto, seems to 'clear' this problem for me.

*I was recently trying to OC my ram up to 1000mhz...as I got past 980mhz, the 1x link came up. Reseting the NB voltage to auto fixd the problem....ram would not pass prime Blend test though...


At the tiptop end of the mobo's FSB {490mhz) I have noticed another weird problem...sometimes the mobo 'forgets' I have DVD drives! As soon as I lower the FSB back down to 480...they come back.
post #9 of 9
Thread Starter 
I have some issues with Orthos as well... but only on the second core.
I went down to 390, but I'll have to test that as well.

Another problem I have is that I can't OC my ram...
It seemed to be working @938, but my FSB was not really high (can't remember precisely).
With FSB around 400, though, the system won't boot at 1000+ for ram, whether its voltage is boosted or not (went up to 2.25, but I'm not too fond of going further).

So I'm basically wondering if my system can stay OC to some "reasonable" values while still being fully stable :/
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