Have a strange quirk going on on my mac pro 2.66.
I have the stock 2 X 512 installed but have also upgraded with 2 X 1 Gig sticks (samsung I believe) . They've been working fine stability wise. No crashes or anything else but I was shocked after a recent trip to System profiler said my 2 X 1 gig chips were actually 2 X 512?
It seems system profiler isn't seeing half the memory on both my 1 Gig sticks. I had rebooted once and it came back to recognizing the full memory. Another time I rebooted and they were back down to 512mb each? What gives?
Does this sound like faulty memory or a problem with my mac pro? I've read of problems with bootcamp recognizing more than 2 gigs of ram but this is booted in OS X.
Any suggestions or info on this problem would be greatly appreciated.
Try the RAM in different slots. If the issue persists, I'm willing to bet the chips are defective, but the chances of both chips going bad at the same time are rather slim (in most cases, though it can happen). It wouldn't surprise me if your Mac Pro's logic board is on its way out. The only way to know for certain is to use the chips in a different Mac entirely.
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I'm suspicious that heat may have something to do with it. After my machine was off all night, it booted up and recognized both chips fully at 1gig each. I'll leave my mac on for the day and reboot it hot later and see if the chips show up with less ram again.
The thing is with the memory is I haven't ever had a kernal panic or other instability. I also ran apple hardware test last night when the problem was present and it said my hardware was fine though it identified my 1 gig chips as 512mb. Strange.
One reason we don't recommend unmatched RAM are issues like these.
Also especially with Xeons it' much wiser to populate the entire banks with matched 512s first so the heat sinks are maxxed.
Are the 1 gigs returneable/exchangeable??
I would tend to run Rember for a few hours and see what turns up.
You could also just use the 2 x 1 gig just to narrow the diagnositic range.
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The chips do have a lifetime warranty so I could return them. I did run Rember for a few tests but not for a few hours and it didn't detect any problems despite the fact System Profiler was saying my 1 gig chips were actually 512mb at the time. I'll run it again for a few hours as you suggested and see what gives.
I suspect it's some interaction with the stock Apple chips.
I'd run the 1 gig pair on their own and see if any anomaly shows up.
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This is odd
I've had my mac running all day and its been recognizing the full 3 gigs. I boot up xp in bootcamp and then return to OSX on a restart and I notice its only recognizing 2 gigs again? Hmm.
I shut down, open my mac and reseat my lower ram carrier card (that holds my 2x1Gig memory modules) and boot back into OSX. My full 3 gigs appear to be there.
Is it possible that the XP 2 gigs of ram limit is causing this when I restart into OSX? When I noticed it yesterday, I had been previously into XP.
Mac Pro RAM going MIA?
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