Hello Jeff,
I have memory errors I am trying to sort out and need some kind of memory map so I can identify the bad bank of memory.
Config
s900 w/g4/450 card (XLR8)
656,mb A1-128mb B1-128mb A2-128mb B2-128mb B3-128mb
Rammometer errors
$13ACA200 $139DA200 $13BBA200
If you can tell how I can figure out which bank is bad from the info here I would appreciate. OR if you can tip me off to URL that will let me figure it out I would really appreciate it.
Sorry about the direct line, butthe archives are somewhat difficult to search in.
Semper Fi!
Edward R Johnson
Hello Edward,
I am sending this to the list as well, as this comes up with some regularity. Any follow up replies will go to the list.
Unfortunately, neither I, nor anyone else on the list knows how to translate the RAMometer addresses into physical RAM sticks. Therefore, identifying the problem stick(s) can be very tedious (not to mention time consuming).
I recommend that you start by cutting up some sticky label (like a mailing label) into small squares, and use it to label each of your RAM DIMMs so that you can tell them apart. Just labeling them 1 - 5 would be fine.
When RAMometer is running it cannot test all of your installed memory because the Operating System still occupies a portion of memory and RAMometer cannot test that portion occupied by the OS. Unfortunately, we don't know whether the OS occupies memory at the top, the bottom or a little of both. To compensate for this, the list came up with the RAM Sandwich (TM Japan Peter) method of testing.
In brief, to use the RAM Sandwich method, install a known good DIMM each in A1 and A3. Install a DIMM to be tested in A2. Remove all other DIMMs. Run RAMometer for at least 1200 iterations. I've seen failures between 1200 and 1300, so I usually use 1500, which basically means run it overnight. If it passes 1500 iterations, the DIMM in A2 is probably good. If it fails, the DIMM in A2 is bad (because you know the ones in A1 and A3 are flawless and can't be the problem).
Now the lengthy description of this testing method arises when you don't have two "known good" DIMMs. How do you get from a handful of unknown quality DIMMs to having two that you know are good?
Install three of your questionable DIMMs in A1, A2 and A3. Run RAMometer for 1500 iterations or until it fails out.
If the test passes (completes 1500 iterations successfully), you know that the DIMM in A2 is good. You do not know that the DIMMs in A1 or A3 are good because they may have been holding a part of the Operating System and so were not fully tested.
If the test fails before it reaches 1500 iterations, you do not know which DIMM is bad. It could be any of the three, because at least a portion of all three was being tested. This is a pain. Try again, with a different combination of DIMMs. Note which combinations of DIMMs in which slots you have tried, so that you can systematically work through it.
Once you find a single good DIMM (one set of three passed 1500 iterations and you siezed the DIMM in A2 as a good one), install it in A1 and leave it there for the rest of your tests. This simplifies finding your second good DIMM a little bit. Now you know that the DIMM in A1 won't be causing the failure.
Once you've passed two DIMMs (found a good DIMM in A2 twice), you're in the clear.
With two known good DIMMs testing is much easier as described above. Just test each of your questionable DIMMs in A2 with it surrounded by your known good DIMMs and pass or fail according to what RAMometer tells you.
Jeff Walther
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