hey:
I wanted to order a mac pro 8 core 2.26 with 16 gb ram. But apple told me on phone that 12 gb ram will work better then 16 gb. I am very confused now. Is that true? please help me!!!
Lars
I will use it for music production with a lots of vst plugins.
thanks for helping. but what is the tri-channel effect???
Ok. Now I understand. but would you go for a 8 core 2.26 or quad core 2.66? Is clock speed important for my use? I want to have this mac for 3-5 years.
thanks
thanks so much for helping. I dont want to bother you, but would you go for ATI Radeon or nvidia? Do you think that i should order with 12 gb ram and upgrade later if i need that or should just order 16 gb now?
Ok. Now I understand. but would you go for a 8 core 2.26 or quad core 2.66? Is clock speed important for my use? I want to have this mac for 3-5 years.
thanks
http://www.apple.com/macosx/technology/#grandcentral
Also..
Quad-core: Four memory slots supporting up to 8GB of main memory using 1GB or 2GB DIMMs
We don't have Grand Central yet, and it has been confirmed that you can use 4 GB modules to get up to 16 GB RAM.
Probably not needed but maybe someone will ah-ha on this:
Triple ChannelThis mode offers the high throughput for real world applications. Interleaving reduces
overall memory latency by accessing the DIMM memory sequentially. Data is spread
amongst the memory modules in an alternating pattern.
Three independent memory channels give two possible modes of interleaving:
- Triple channel mode is enabled when identical matched memory
modules are installed in each of the three memory channels (blue
connectors).- If only two of the blue memory connectors are populated with matched
DIMMs, dual channel memory is enabled.
Sadly, what's missing from this documentation is what mode you enable with identical matched memory modules installed in all four of the slots. Is it dual channel? Tri-Channel on three sticks and single on one? As far as I know, no one has determined for sure what happens.
Apple followed Intel's design. They didn't actually have a choice, as this is how the Integrated Memory Controller in the CPU is designed.Yeah it says. 3rd sentence of the document begins it and it goes on to explain more including some rules and stuff.
"Dual channel mode is enabled when the installed memory capacities of both DIMM channels are equal."They give this specific example as well:
Dual Channel (Interleaved) Mode Configuration with Four DIMMs
My only concern is that I think this is Intel's reference design and I'm not sure how closely Apple follows it.
EDIT: I guess it's not too far off. Pages 3 and 4 of this document: http://manuals.info.apple.com/en_US/Mac_Pro_Early2009_Memory_DIMM_DIY.pdf say basically the same thing - but in Applese. More can be found here: http://support.apple.com/manuals/#macpro
For others reading on, skimming or something, this is only for 2009 Mac Pros. Previous models are different.