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Topic : "ecc vs. necc ram - OSX" |
ten
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Joined: 30 Dec 2003
Posts: 76
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 Posted: Fri Mar 16, 2007 3:32 pm |
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i'm on a mac quadG5. a few questions:
edit -- outdated info --
Last edited by ten on Sat Aug 09, 2008 2:55 pm; edited 1 time in total |
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B0b
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Location: Sunny Dorset, England
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| Posted: Mon Mar 19, 2007 3:25 am |
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i'm taking that you've got a Quad Core new Mac Pro?
this only takes ECC RAM, if you use Non ECC RAM this will fail to be recognised by the system..
yes you must have matching Pairs - it doesn't matter if you use 2x1GB with 2x512MB etc as long as they're Pairs 
| apple wrote: |
| Mac Pro systems support up to 16GB of 667MHz DDR2 fully buffered ECC RAM in eight FB-DIMM slots. |
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ten
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| Posted: Mon Mar 19, 2007 11:38 am |
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hey thanks bob. i can always rely on you to respond to tech questions. 
edit -- outdated info --
Last edited by ten on Sat Aug 09, 2008 2:54 pm; edited 1 time in total |
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B0b
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Joined: 14 Jul 2002
Posts: 1807
Location: Sunny Dorset, England
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| Posted: Tue Mar 20, 2007 5:43 am |
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using ECC on a PC requires you to enable ECC in the BIOS, as the Mac has no bios (pre Intel) i'm thinking that Apple in their wisdom decided to allow both in the system..
ECC is usually used in high end servers, some motherboards require you to use ECC if you are breaking the 2GB barrier others are happy for you to have non ECC, it all depends on the manufacturer (my Athlon MP system required me to use ECC, but my new Intel E6600 core 2 duo running on an Asus P5W DH Duluxe will accept either i'm hoping to take my sys to 6GB soon - editing 30x20in Photos @ 300DPI 16bit is very taxing when you've only got 2GB RAM!)
as far as performance goes Non ECC is actually a faster performer, as the ECC RAM checks itself as the request for the RAM by the app is made, in real application performace, you'll hardly notice the difference, but as far as benchmarks go 
the cost per MB is more for ECC than non..
open the case up and pull some RAM out (with the power off ), the RAM will have a sticker on it describing what the RAM is |
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