 |
 |
Mixing memory capacities in new Mac Pro?
|
|
|
|
|
Professional Poster
Join Date: Mar 2000
Location: New York, NY, USA
Status:
Offline
|
|
Have a new, out of the box 3.33 six core machine. Came with 3 1GB sims. I put in 3 2GB sims, and had one of the 1GB sims in the other slot. On restart, the screen was distorted and a dialog box told me, I think, that something was wrong with the memory. I removed the 1GB sim and all is well.
Can you not mix and max with the new machines?
|
|
The era of anthropomorphizing hardware is over.
|
| |
|
|
|
|
|
|
|
Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
Status:
Offline
|
|
LGA 1366 boards require matched pairs of three. Mixed capacities are okay as long as you're installing them in threes and in the proper slots.
|
"The natural progress of things is for liberty to yield and government to gain ground." TJ
|
| |
|
|
|
|
|
|
|
Professional Poster
Join Date: Mar 2000
Location: New York, NY, USA
Status:
Offline
|
|
Originally Posted by Big Mac 
LGA 1366 boards require matched pairs of three. Mixed capacities are okay as long as you're installing them in threes and in the proper slots.
Raises the question: why did Apple include four slots?
|
|
The era of anthropomorphizing hardware is over.
|
| |
|
|
|
|
|
|
|
Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
Status:
Offline
|
|
Oh. . . good question, I dunno. I think all high end Intel boards of this generation are triple pumped DDR. I'm pretty sure that's true for the Xeon line as well, but you're right there are four or eight slots on the Mac Pros, aren't there. . . Others will know better than I.
|
"The natural progress of things is for liberty to yield and government to gain ground." TJ
|
| |
|
|
|
|
|
|
|
Moderator  Join Date: Apr 2000
Location: Gothenburg, Sweden
Status:
Offline
|
|
The Xeons in the MP can run in either single channel, dual channel or triple channel mode. If you fill all four slots with matched RAM, it goes to dual channel mode.
Not that this matters as much as it once did, because 1333MHz DDR3 has a LOT of bandwidth. I seem to remember Intel saying that 3 cores running flat out on memory intensive code on an i7-870 will only almost saturate dualchannel DDR3-1333. Of course a hexacore might run into that limit at some point, but with the memory latency going up compared to Lynnfield, it seems unlikely. The system is also limited by the inflexible load/store ports in the Nehalem architechture - Sandy Bridge fixes this (and thus needs four channels).
|
|
The new Mac Pro has up to 30 MB of cache inside the processor itself. That's more than the HD in my first Mac. Somehow I'm still running out of space.
|
| |
|
|
|
|
|
|
|
Professional Poster
Join Date: Mar 2000
Location: New York, NY, USA
Status:
Offline
|
|
Yep. Looking at OWC's memory configs, you can fill all four slots.
|
|
The era of anthropomorphizing hardware is over.
|
| |
|
|
|
|
|
|
|
Mac Elite
Join Date: Mar 2004
Location: Truckee, CA
Status:
Offline
|
|
Originally Posted by Don Pickett
The era of anthropomorphizing hardware is over.
Says who? 
|
|
|
| |
|
|
|
|
|
|
|
Professional Poster
Join Date: Mar 2000
Location: New York, NY, USA
Status:
Offline
|
|
Originally Posted by SierraDragon
Says who?
That .sig is years old. It's from the PPC/Intel transition, when some people were saying that any machine with an Intel processor couldn't be a "real" Mac.
|
|
The era of anthropomorphizing hardware is over.
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
 
|
|
|
Forum Rules
|
|
|
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
|
HTML code is Off
|
|
|
|
|
|
|
|
|
|
|
|
Top