Custom User Title
Join Date: Jul 2006
Location: At home
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Does the RAM is that much superior ? I mean... it's really expensive. Is it worth it ?
Can I wait and see a 3rd party makes RAM as good as apple one ? ...less expensive ? |
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Veteran Member
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Apple RAM is always overpriced.
That said, there's not too many options available for FB-Dimms. http://www.newegg.com/Product/Produc...ubCategory=147 |
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Custom User Title
Join Date: Jul 2006
Location: At home
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I dont know that much about RAM.
Is this pretty similar ? http://www.newegg.com/Product/Produc...82E16820134085 Edit : Apple's RAM is 240 pin ? (I repeat : I dont know that much about RAM.) |
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Custom User Title
Join Date: Jul 2006
Location: At home
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Forgot to ask ...
I'm targeting 4gb of RAM. Macpro comes with 2x512. Will it be faster if I remove thoses and put 4x1gb. Or 2x2gb is it faster. Or 3x1gb+2x512 will be fine ? ... |
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Senior Member
Join Date: Dec 2005
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You want dual configs. Or ideally quad-configs because of the way the controllers are set up. 4x1 GB would be the fastest way to do it.
EDIT - by fastest I mean "most bandwidth", not easiest, and not clockspeed. |
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Custom User Title
Join Date: Jul 2006
Location: At home
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And what about 8x512 ? Can it compare to 4x1gb?
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Member
Join Date: Jul 2006
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are you in graphic design, because if you are not stay away from anything more than 2gb otherwise it will kill your preformance
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Custom User Title
Join Date: Jul 2006
Location: At home
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hehe. Yeah I'm in. Photoshop and 3dsmax (will have to boot in windows, noooooooooo. Maybe parallels will offer me a good performance but I dont think so)
I just read the documention of apple about adding ram yourself. My only question left is : 8x512 vs 4x1gb? |
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Senior Member
Join Date: Jul 2004
Location: Sydney, Australia
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http://manuals.info.apple.com/en/Mac...ryDIMM_DIY.pdf
You could use third party RAM though Apple recomend there own. |
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Mac Mini Maniac
Join Date: Sep 2005
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To get maximum bandwith (256-bit) you need 4 sticks. Anything above that is (from a bandwith perspective) pointless. |
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Member
Join Date: Feb 2005
Location: Paris, France
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i can't find 32 module FB-DIMM DDR2 PC2 5300 anywhere... apart from that, i've read good reviews of FB-DIMM DDR2. negative point is that for the moment almost no-one is making them, being that they are destined for "mission critical servers", but most manufacturers have announced products. |
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Custom User Title
Join Date: Jul 2006
Location: At home
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Thunderbolt, fuck yeah!
Join Date: Jan 2005
Location: Denmark
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Four sticks: 4*64bit=256bit Eight sticks: 8*64bit=512bit Since the memory bus is "only" 256 bit wide you need four sticks to use all your bus' potential bandwidth. If you put in more than four sticks you will get more memory, but not more bandwidth. So using 8*512MB sticks will give you 4 GB RAM @ 256 bit, because the bus can't cope with 512 bit. But it doesn't hurt performance, it just means that those last 4 sticks wont increase your memory bandwidth from 256 to 512 bit. You should see it from an economical perspective instead; what is the cheapest? 8*512 MB sticks, or 4*1 GB sticks, keeping in mind you only have 8 slots and you might wish to upgrade at a later time. |
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Custom User Title
Join Date: Jul 2006
Location: At home
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Thx Mugge. That was the kind of explanation I was waiting for !!! (kinda noob with RAM stuff)
And about the memory riser card, why there is 2 of them ? Because 8 sticks couldn't fit on a single one ? Like when Muggle said "Since the memory bus is only 256 bit wide" I though it was 256 per riser card. |
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Member
Join Date: Oct 2005
Location: Texas
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Please explain. I'm on an old mac -- runing 512MB RAM. I was contemplating 4GB RAM on a Mac Pro because I used a Quad G5 at an Apple Store with 4GB that really smoked on all of the paces I put it through. I can only really afford 2GB RAM on one of these, and even that is pushing it. I'm asking you to explain, because it might make me feel easier about not finding the extra money to put into getting 4GB. |
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Veteran Member
Join Date: May 2004
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Yeah, uh, halfassed, I'm interested in hearing the explanation behind this one too... I'll be gentle this time...
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Less than Stellar Member
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I'm thinking it's something he heard a long time ago and still believes to be true. Just like any drive over 120 gb gets wasted because the OS can't read more than 120 gb.
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Veteran Member
Join Date: May 2004
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Heh. Hey, he was gracious in the other thread, I'm interested in hearing what he's got to say on this one. You get used to a *LOT* of weird crap as a Windows user.
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Member
Join Date: Feb 2005
Location: Paris, France
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careful with axes
Join Date: May 2004
Location: Hillsborough, CA
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Just be aware that FB-DIMMs from Apple will have heatsinks designed specifically for the cooling system and aftermarket RAM will not.
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Member
Join Date: Feb 2005
Location: Paris, France
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i'm aware of that and anyways it's entirely possible to find these things to stick on, but on page 2 of this technote it states :
DIMMs for Mac Pro must fit these specifications: 667 MHz, FB-DIMMs 72-bit wide, 240-pin modules 36 devices maximum per DIMM Error-correcting code (ECC) i know i made a mistake above saying it was 32 modules but, duh, it's 36... question remains the same however. Last edited by initialsBB : 2006-08-09 at 05:47. |
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Veteran Member
Join Date: May 2004
Location: Clayton, NC
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Heat sinks on RAM modules? Has anybody ever heard of these being required in any PC before? Are these modules a totally new type? I never even knew heatsinks for RAM modules existed before the Mac Pro was unveiled.
Ugh. |
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Rocket Surgeon
Join Date: Feb 2005
Location: The Canadark
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On that subject, I just took a detailed look at the temperature monitor on my Quad, and the RAM is the hottest part. I guess the time for a heatsink on Ram has come.
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Member
Join Date: Feb 2005
Location: Paris, France
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i haven't personally ever used them but i know of others who have, including G5 owners who like Bryson noticed that it is a part of the tower that heated up more, so they took precautions. they're pretty cheap so it's not that big a deal. Last edited by initialsBB : 2006-08-09 at 12:04. |
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Veteran Member
Join Date: May 2004
Location: Minnesota
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Found this on MacWorld's site:
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Member
Join Date: Mar 2005
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These guys have a kit of 2x512 with the heat sink for $199 http://omnitechnologies.biz
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Mac Mini Maniac
Join Date: Sep 2005
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In order to double capacity without resorting to higher-capacity chips, the factory can put 8 (or 9) chips on each side of the memory stick, thereby cramming 16 (or 18) chips on a stick. In servers, with their usually larger requirements for memory, you can also find memory sticks that have two memory chips on top of each other, a bit like a double-decker bus, thereby facilitating 32 chips on a stick of RAM (or 36 with ECC). The memory controller obviously needs to be capable of "reading" the 16 extra chips, or you'll waste half the capacity of the stick of RAM... I am not aware of sticks that are stacked 4 chips high on both sides, but they might be out there (or arrive at some point in the future) and they won't work properly in your new Mac Pro. The number of rows of chips (8 or 9 chips in a row) is called "rank". The Mac Pro supports single- dual- and quad-rank memory modules. Converted 07/2005. Last edited by Yonzie : 2006-08-10 at 06:56. |
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careful with axes
Join Date: May 2004
Location: Hillsborough, CA
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Already been said in the thread, but I'll simplify it. To utilize the maximum 21 GBps memory bandwidth, merely installing a pair of FB-DIMMs isn't enough. You need a minimum of FOUR FB-DIMMs, a pair in each riser to fully saturate the quad-channel memory bus.
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Member
Join Date: Jun 2004
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Heat sinks on ram modules have been available for years -- a lot of the high performance ram used by over-clockers have them. |
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