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memtest86 interpretation help

post #1 of 7
Thread Starter 
This is hopefully just a noob question and not a problem with my memory.. When I run memtest it lists the available total ram after the L1 - L3 cache lines as 7880M. I have 8GB of RAM, why does it not say 8192M? Is that an instant indication that I have dead blocks because it can't see everything?

I did not get any immediate errors after one pass, and I certainly need to run it longer, but is this just the same as a hard drive in being that it can't access the entire memory module even though it's rated at 8GB or do I have an issue?

I thought memtest would tell me if I had errors, but I don't understand how it will tell me if part of the stick is dead so this math is throwing me for a loop. Like I said, maybe just a noob question that hopefully will require simple explanation.
thanks
    
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post #2 of 7
Quote:
Originally Posted by stellamonster7 View Post

This is hopefully just a noob question and not a problem with my memory.. When I run memtest it lists the available total ram after the L1 - L3 cache lines as 7880M. I have 8GB of RAM, why does it not say 8192M? Is that an instant indication that I have dead blocks because it can't see everything?
I did not get any immediate errors after one pass, and I certainly need to run it longer, but is this just the same as a hard drive in being that it can't access the entire memory module even though it's rated at 8GB or do I have an issue?
I thought memtest would tell me if I had errors, but I don't understand how it will tell me if part of the stick is dead so this math is throwing me for a loop. Like I said, maybe just a noob question that hopefully will require simple explanation.
thanks

Perhaps some of your RAM is being allocated to your cpu's integerated GPU?
     
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post #3 of 7
Thread Starter 
great thought. I guess I will check BIOS, maybe I turned up the juice on this feature and allocated some thinking it would help iGPU since I am using the iGPU.

So is my general question about memtest answered from this potential factor in your opinion. Is that what happens in memtest when some is allocated to iGPU where you see less than the total of the sticks or could I still have "missing" units of memory if memtest does not witness all 8192M?

I'll check later when I can as I am not on that machine right now, but if it's not allocated to the iGPU, that spells an issue correct?
    
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post #4 of 7
Quote:
Originally Posted by stellamonster7 View Post

great thought. I guess I will check BIOS, maybe I turned up the juice on this feature and allocated some thinking it would help iGPU since I am using the iGPU.
So is my general question about memtest answered from this potential factor in your opinion. Is that what happens in memtest when some is allocated to iGPU where you see less than the total of the sticks or could I still have "missing" units of memory if memtest does not witness all 8192M?
I'll check later when I can as I am not on that machine right now, but if it's not allocated to the iGPU, that spells an issue correct?

If you are using iGPU (which you are) then yes, It is taking a bit of your memory to use as graphics memory. Somewhere in the bios will be a place where you can choose how much to allocate for graphics memory.

If for some reason that wasn't the case then yes there is some sort of other problem.
     
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post #5 of 7
Thread Starter 
okay, I'll post my findings when I get on that machine and hopefully that's what it is. btw, is 312MB an odd amount to be missing? Is RAM really capable of being broken down to segments as small as 8MB when using iGPU, that's the only number that I can divide by to reach it.
    
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post #6 of 7
Quote:
Originally Posted by stellamonster7 View Post

okay, I'll post my findings when I get on that machine and hopefully that's what it is. btw, is 312MB an odd amount to be missing? Is RAM really capable of being broken down to segments as small as 8MB when using iGPU, that's the only number that I can divide by to reach it.

Actually I didn't even notice how weird of a number that is. I suppose its possible though, perhaps it goes by % of total ram.
     
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post #7 of 7
Thread Starter 
I had iGPU set to auto so that must have been why the wierd number. I watched memtest run through the full set of sizing tests and after the L3 cache test was finished, it ran up to the full 8192MB so it was both the iGPU in terms of available memory shown on the left column, however, memtest iterations must still recognize and know to test the entire physical memory.

So your thought was accurate and on top of that memtest still does it's job regardless of whether you have memory allocated to iGPU. I don't know if this is known information or not, but I guess it may be relevant if anyone using iGPU was ever afraid that memtest wouldn't run through their entire physical memory if some was allotted to iGPU. There is no need to worry, it tests everything.
thanks biggrin.gif
    
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