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Bad RAM or software error?
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Senior User
Join Date: Mar 2001
Location: London, England
Status:
Offline
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I just got a new 8-core Mac Pro with the standard 2x 512 meg ram modules installed. I added 2x 1GB crucial modules and it booted up fine, telling me I had 3GB of memory. But not for some reason it says I only have 2GB and that all the modules are 512 megs.
All 4 modules are recognized and 'OK' but the 2 crucial ones are said to be running at 1/2 their capacity. Do you think I have a bad DIMM or something?
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LC 16Mhz • LC 475 25Mhz • Centris 650 25Mhz • Performa 6200/75Mhz • G3 266Mhz • Snow iMac DVSE 500Mhz
G4 QS 733Mhz • 17" Powerbook 1.33Ghz • 15" MacBook Pro Core Duo 2.16Ghz • Mac Pro 8-Core 3.0 Ghz
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Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
Status:
Offline
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"The natural progress of things is for liberty to yield and government to gain ground." TJ
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Senior User
Join Date: Mar 2001
Location: London, England
Status:
Offline
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Has this happened to anyone before? I find it odd that if the ram is bad, both dimms have been throttled down to 1/2 capacity. What does it mean?
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LC 16Mhz • LC 475 25Mhz • Centris 650 25Mhz • Performa 6200/75Mhz • G3 266Mhz • Snow iMac DVSE 500Mhz
G4 QS 733Mhz • 17" Powerbook 1.33Ghz • 15" MacBook Pro Core Duo 2.16Ghz • Mac Pro 8-Core 3.0 Ghz
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Senior User
Join Date: Mar 2002
Location: between a rock and a casbah...
Status:
Offline
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Has this happened to anyone before?
Big Mac is right. I have had this exact same thing happen with Crucial RAM, but on an iBook, not a MacPro! A 512 RAM chip was only registering half its capacity. I sent it back; they cross-shipped a replacement. Everything was tickety-boo.
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Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
Status:
Offline
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Yup, it's a classic symptom of bad RAM, especially if it previously registered properly.
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"The natural progress of things is for liberty to yield and government to gain ground." TJ
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Senior User
Join Date: Mar 2001
Location: London, England
Status:
Offline
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Now it's magically gone back up to 3GB...
I'm so bamboozled 
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LC 16Mhz • LC 475 25Mhz • Centris 650 25Mhz • Performa 6200/75Mhz • G3 266Mhz • Snow iMac DVSE 500Mhz
G4 QS 733Mhz • 17" Powerbook 1.33Ghz • 15" MacBook Pro Core Duo 2.16Ghz • Mac Pro 8-Core 3.0 Ghz
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Addicted to MacNN
Join Date: Jan 2003
Location: ~/
Status:
Offline
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Originally Posted by z0ne81 
Now it's magically gone back up to 3GB...
I'm so bamboozled
Send it back before you lose data.
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Senior User
Join Date: Mar 2001
Location: London, England
Status:
Offline
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I intend to send it back.
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LC 16Mhz • LC 475 25Mhz • Centris 650 25Mhz • Performa 6200/75Mhz • G3 266Mhz • Snow iMac DVSE 500Mhz
G4 QS 733Mhz • 17" Powerbook 1.33Ghz • 15" MacBook Pro Core Duo 2.16Ghz • Mac Pro 8-Core 3.0 Ghz
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