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Question about "auto" memory timings

post #1 of 6
Thread Starter 
If a bios's memory timings are set to "auto" or doesn't allow setting memory timings (here I'm assuming they behave similarly, plz correct me if wrong), does this mean it will typically read the values from the memory itself from a table of certain standard ram speeds?

And if I overclock the fsb (with the memory) so that the memory operates between standard frequencies, how will the timings be chosen? Based on the next highest or next lowest frequency listed in the table? This assumes I am correctly understanding the table to have a set of timings for a few limited standard speeds.

Hope my wording is clear enough to understand.
    
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post #2 of 6
The more you raise the FSB,The memory will set itself to a high value if memory is set to auto.

It's best to set factory values and volts if your going to OC.Now I set the factory values in my wifes pc even before I decided to OC hers.
Edited by AMOCO - 1/1/13 at 4:50pm
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post #3 of 6
I always set my timings and voltages manually with memory
post #4 of 6
Thread Starter 
Quote:
Originally Posted by AMOCO View Post

The more you raise the FSB,The memory will set itself to a high value if memory is set to auto.
It's best to set factory values and volts if your going to OC.Now I set the factory values in my wifes pc even before I decided to OC hers.

Are you saying that the mobo will just choose arbitrary "high" values when raising FSB, disregarding the memory's programed timings? Or that it will adjust itself gradually slower timings based around how it's rated on the memory itself? e.g. memory is 6-6-6-18@400Mhz and 5-5-5-15@333Mhz. Setting FSB to something in between, say, 380Mhz, would it choose one of the two listed, try to choose something in between, or disregard it altogether and do its own thing?

So if it was just not overclocked FSB at one of those speeds, would it then just follow those timings? Starting to get myself more confused now.
    
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post #5 of 6
It will disregard it completely.It's best to set the memory timing and volts manually like K62-RIG mentioned.
It will jump the timing values up out of memory factory specs. and won't be stable.
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post #6 of 6
Thread Starter 
Hey, thanks for the inputs. AMOCO, by "jump the timing values up out of memroy factory specs, and won't be stable", do you mean the timings might be using the tighter timings/lower values side? The non-stable implies faster timing than it can handle, right? I'm getting the feeling from the responses that there's no real standard way the mobo will set the timings, so it will depend on the specific motherboard and bios versions.

The main problem is the system I'm currently interested in has an OEM locked bios, so I can't see nor set the timings from bios. When I overclock the fsb along with memory, the cpu is stable, but I'm getting memtest failures. In fact, I'm more interested in learning about what is actually happening than the actual OC results. The memory is rated at much higher speeds than the fsb is clocked to, so I'm trying to figure out if it's a memory timings issue or maybe something to do with the northbridge's response to the fsb increase.

Is there any software that will show the actual memory timngs being used? I guess this will also depend on the mobo as well... CPU-Z is blank on the memory tab. That's kind of why I was trying to ask how the motherboard would try to interpret the SPD values at profile speeds and in between. I guess the motherboard might not even use the SPD profile speeds at all?
    
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