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A8N-SLI memory timing wierdness

S

Speedo

Senior member
A strange thing I've found with this motherboard is that when changing memory divider (ex. to 333 to be able to up the FSB without pushing the mem too far), the motherboard seem to set tighter timing than the SPD says. I have solved most of this by locking the known values like CAS, but for the last four settings I don't have a clue what they should be. I think that the motherboard might be setting these values too tight as well, limiting my overclocking.

Any advice?
 
I really thought there would be a bounch of people knowing how the memory settings in the BIOS works??

I'm a newbie in this regard, and need help. Anyone??
 
Originally posted by: Speedo
I really thought there would be a bounch of people knowing how the memory settings in the BIOS works??

I'm a newbie in this regard, and need help. Anyone??
Click to expand...

it's a known problem...learn to use Google.

There should be a BIOS solution soon for the overclockers out there.
 
Yes, I do use google a lot. But I don't know exactly what to search for to find info about this. And these forums tend to be very useful, so I thought I'd try here.

So what do you know about the problem? Is it A8N-SLI only, or a common thing for nForce4 mobos?
 
I don't think the last 4 settings will change anything. The DDR333 setting is definitely messed up. I can run stable at 220 FSB/DDR at 1T. I have to go to 2T to get the memory speed any faster. If I try to use the DDR333 setting at 1T and the FSB at 240 (should leave the memory at 200 mhz, well within its capability), it won't boot into Windows. I tried maxxing out all the other settings, but it still freezes before the Windows splash screen appears. I'm hoping this supposed fix will take care of it. I think it's a problem with the A8N-SLI and not the nForce4 in general.
 
I know the A8N-SLI has the problem. It's all over the place.

The 1007 BIOS whenever it comes out has been rumored to fix this.

Once overclocked none of the dividers are correct.
 
1007? The one out now is 1004 and 1005 beta AFAIK. Why would they wait so many bios revisions to fix it?
 
I was having the same issue and i tried everything but i have DDR 500 mem so i was planning on running 1:1 anyhow. I did want to see if i could tighten up my timings a bit but o-well. My bandwidth is like 6600 and that is pretty good. I locked and unlocked PCI, i even cranked up the voltages but to no avail. the only way i found you can control your DDR is when it's set to 400 max. since that is the default front side bus it gives you control over your RAM but at the expense of limiting your CPU clock. It's a new board and they are fixing everything SLOWLY but they are doing a good job as far as i'm concerned. When i first got this board i was very disappointed because i had some trouble but now it's cool, quite, rock solid and screamin fast! Of course the quiet part comes on behalf of replacing the chipset fan but boy was that worth it! Good luck and be patient they'll get it figured out sooner or later! By the way i noticed they came out with the 1007 beta!
 
Originally posted by: Speedo
1007? The one out now is 1004 and 1005 beta AFAIK. Why would they wait so many bios revisions to fix it?
Click to expand...

That's the way many BIOS work. Fixes are concurrently implemented and released. I am sure one of the betas along the way will have the necessary revisions.

Again though this is a 'rumored' to happen thing. Supposedly those that have called ASUS have confirmation.
 
Originally posted by: MatrixVPR
the only way i found you can control your DDR is when it's set to 400 max. since that is the default front side bus it gives you control over your RAM but at the expense of limiting your CPU clock.
Click to expand...
Well, when changing the CAS latency and the other settings at the top, they seem to take effect. Actually I can run my PC3200 at 250FSB, so it works pretty well right now, but I was mostly wondering why I have to lock the settings. When leaving all of the settings at "auto" and setting DDR333, the mobo will set tighter timings than the SPD says.

Originally posted by: MatrixVPR
When i first got this board i was very disappointed because i had some trouble but now it's cool, quite, rock solid and screamin fast! Of course the quiet part comes on behalf of replacing the chipset fan but boy was that worth it!
Click to expand...
Yea, I have done the same. I use the Zalman NB47J. The original chipset HSF was terrible.

Originally posted by: MatrixVPR
By the way i noticed they came out with the 1007 beta!
Click to expand...
Ok... so they are skipping 1005 and 1006 then? I see asus.com.tw doesn't list any beta bios at all at the moment...




 
Well Speedo i guess the A8N-SLI still has some bugs it but supposedly they will be worked out next week. At least that is according to Anand's MoBo guy and what he herd form his resources. We'll see Hopefully they will have more memory options when they fix the 250 speed barrier.
 
What's the "250 speed barrier" ? Is it with certain memory settings? I was running up to 180FSB on another A8N-SLI system I built, and it worked fairly well. However, I got a freeze when trying to run some 3D applications, as if the PCI-E bus was running to fast. I guess it's because the frequency locks etc. is whacked out right now.

It surely will be interesting to see how the new bios performs.
 
Originally posted by: DerKaiser
I don't think the last 4 settings will change anything.
Click to expand...

Actually the last 4 settings, well 2 of them anyway, have a fairly significant effect on bandwidth. But if you OC then you probably don't want to be touching them. I prefer to loosen the timings rather than run at a divider or 2T - as far as possible.
 
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