|I had problems with a Dell 3000 desktop I was working on when I tried to add more ram to it. |
Apparently the dxxm mboard on it is pickier than similar mboards regarding ram, and it will only run some specific modules at the full speed the mboard supports.
It had an Infineon 256mb module in it which I assume came with the new computer. I got ram errors when I ran ram diagnostics when any of the other should be suitable modules I had on hand were installed along with the Infineon module. The Infineon module tested fine when by itself. I got no ram errors when any, or most ?, of the other modules were installed and the Infineon module was not installed.
I finally bought a new Kingston 512mb module that should have worked fine because it was listed for another mboard with the same main chipset - it produced no ram errors, but the mboard would NOT run it at it's full speed even when it was by itself - it ran full speed on other mboards I tried it on. (Kingston lists an oddball brand name only module part number for it - the place I usually buy ram at had lots of stock, but would have had to order it in . They don't stock oddball brand name only part numbered ram of any brand. I looked at that module's data sheet on the Kingston site, and picked a module with the same number of chips and memory organization that was listed for another mboard model that has the same main chipset.)
I finally got rid of that Infineon 256mb module when I found it worked fine in combo with another module on mboard that I was working on about three weeks ago.
Since the system has been sitting....
A common thing that can happen with ram, even ram that worked fine previously, is the ram has, or has developed, a poor connection in it's slot(s).
See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
Once you have done that, run ram diagnostics.
If your ram passes a ram test, it's working fine, even if you can't determine whether it's listed for your mboard or system model anywhere
If you do a ram test, do that AFTER having tried cleaning the contacts and making sure the ram is seated properly - otherwise any errors found may be FALSE.
If the ram is incompatible with the chipset, (or in this case, possibly if it's incompatible with the way the main chipset is wired up on the mboard), or on more recent computers, incompatible with the memory controller built into the cpu, it will likely FAIL a ram test - that is NOT a true indication of the ram being faulty - there is probably nothing wrong with it, and it will pass the test if installed in a mboard it is compatible with.
If you want to try a memory diagnostic utility that takes a lot less time to run a full pass than memtest86 does, this one is pretty good - Microsoft's
Windows Memory Diagnostic:
It can be toggled (press T) to do a standard or a more comprehensive set of tests - use the default 6 test one first - if it passes one pass of that, use the latter one. A few of the tests in the latter set are intentionally slower.
If you don't have a floppy drive, see the Quick Start Information at that Microsoft link for how to make a bootable CD of the Windows Memory Diagnostic (you need Windiag.iso - you don't necessarily need to use the program they mention to add it to the CD).