All Of A Sudden - Invalid RAM?

Last night I was using my 2006 Mac Pro and all was well... put it to sleep around 10PM and then woke it up around 6AM today... discovered that the power light was blinking in what appeared to be 3 short blips; as I understand it, this means 'invalid memory' which I take to mean that there's bad RAM but still some good RAM, no?
I figured out which pair was bad pretty quickly but then something weird happened... some of my other RAM occasionally is ID'd as bad but then is ok...
Can someone tell me what the LED lights marked DIMM1/2/3/4 on the riser mean? When one of my "flaky" DIMMS from above causes a problem, one of these lights is on... but they're not on for the pair that stops the MP from booting...
Any thoughts?
Thanks!
-Justin

They are defective anyway, unless it was dust or coming loose.
Maybe age, maybe gradual, maybe from heat.
I see a lot of this type, RAM not showing, reporting half its capacity, seems to be a problem with FBDIMM in general - they generate a lot of heat and use a lot of power, as much as 10-15W per DIMM.
That is why there (should) be lifetime guarantee and warranty. My Apple 4 x 512MB seemed to be on the brink after about 2-3 yrs (would have been 4 come August).
The time to fix, diagnose, and possible issues with data and file system or directory isn't worth taking a change, is it?
Intel wanted for years to get beyond using those FBDIMM and get to DDR3. Even the cost in power and cooling affected servers.

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    2. Do you perform DB restructures? (either explicity by Restructuring or by exporting level 0, clearing and import level 0 then agg) If this is not done on a regular basis (regular depends on the usage of the cube) then you could be experiencing fragmentation, which increases the size of the database, increasing run times.
    3. Have you just added another fiscal year to the database? More data means bigger database.
    RAM upgrade on the EAS server shouldn't affect calc times (unless essbase services are also running on the EAS server, then there might be something to it).
    Most of these (and other) issues can be mitigated by applying proper scope to your calcs (Fix statements).
    What environment are you running in? Windows or Unix?
    New application?
    What kind of time increases are we talking about here?
    Robert

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