Macpro3 16gb (4x4gb Memory Ram For Mac
How do you upgrade the RAM in the original Mac Pro? What type of RAM does it use? How much RAM does it actually support? Please note that this Q&A explains how to upgrade the RAM in the original Mac Pro models (model identifiers and ). EveryMac.com also provides RAM upgrade instructions for subsequent Mac Pro models - the ' (MacPro3,1), ' (MacPro4,1), and (MacPro5,1) systems.
Installing RAM in the original Mac Pro models is a, but it is important to purchase the exact memory needed by the system and install it correctly for optimum performance. These systems also can use more RAM than is officially supported, too. Photo Credit: Apple, Inc. (Mac Pro) Identification Help If you're not sure if you have an original Mac Pro or a later model, the is insufficient as this identifier is shared by the subsequent 'Early 2008' line, which supports a different type of RAM.
Ram Memory For Mac
However, for the purposes of upgrading the RAM, the original Mac Pro models can be properly identified by the in software and externally. More details about specific identifiers are provided in EveryMac.com's extensive section. To locate the model identifier, select 'About This Mac' under the Apple Menu on your computer and click the 'More Info.' If the Mac Pro is running OS X 'Lion' (10.7), click the 'System Report' button after clicking 'More Info.' The original Quad Core Mac Pro models are model identifier and the is model identifier.
The EMC number is located on the rear of the system in small type. As carefully hand documented by EveryMac.com, the original Quad Core Mac Pro models - the, and - are EMC number and the is EMC number.
EveryMac.com's feature - as well as the - also can identify these models by their. RAM Type & Actual Maximum Capacity In basic terms, all original Mac Pro models require '667 MHz DDR2 ECC fully-buffered DIMM (FB-DIMM) memory', but more precisely, Apple states that the memory must meet these specifications:.
667 MHz, FB-DIMMs. 72-bit wide, 240-pin modules.
36 devices maximum per DIMM. Error-correcting code (ECC) Each FB-DIMM has its own chip called an 'Advanced Memory Buffer' (AMB) and 'heatsinks on either side'. Some less expensive versions of FB-DIMM memory do not have heatsinks that meet Apple's minimum standards for use in the Mac Pro. According to Apple, the 'Clovertown Eight Core' Mac Pro is even more strict regarding memory standards (although the company no longer provides specific documentation).
Apple also reports that 'DIMMs must be installed in pairs of equal size from the same vendor.' There are eight FB-DIMM slots in total on two 'riser cards' (four slots per card) that can officially hold 16 GB of RAM. However, third-parties have determined that the original Mac Pro models actually can support 32 GB of memory using eight 4 GB modules that meet the same precise standards. RAM Upgrade Instructions As is printed on the inside of the door of the Mac Pro, FB-DIMMs must be installed in a particular order. The default configuration shipped with a pair of 512 MB FB-DIMMs installed in the first and second slots (towards the 'gold fingers' in the top riser card), which leaves six slots free.
The next pair of FB-DIMMs must be installed in the first and second slots of the bottom riser card, the next pair in the remaining slots of the top riser card (slots three and four), and finally the last pair in the last two slots (three and four) of the bottom riser card. If the instructions on the inside of the door are insufficient, Apple provides a version of the instructions as well. Perhaps even better, though, Apple Specialist provides a step-by-step video of the process: From watching the above video, it is clear that the RAM installation procedure is simple. However, if you do not feel comfortable - or have the time - to upgrade the RAM yourself, professional installation never is a bad idea. Mac Pro RAM Purchase & Professional Installation Options Just because RAM meets the minimum listed criteria does not mean that it will necessarily function as intended in the Mac Pro.
Be sure to buy from a quality vendor that has tested their RAM with each type of Mac to ensure full compatibility. In the US (and many other countries), site sponsor sells memory compatible with all Mac Pro models (and all other Macs). In the UK and Ireland, site sponsor sells Mac Pro compatible memory with free shipping. The company provides flat rate shipping to France, Germany, and Switzerland and inexpensive shipping for all of Europe, too. In Australia, site sponsor sells Mac Pro compatible memory with a lifetime warranty and fast, flat-rate shipping Australia-wide.
In Southeast Asia, site sponsor sells Mac Pro compatible memory with free delivery - and optional upgrade service - in Singapore and flat rate shipping to Hong Kong, India, Indonesia, Malaysia, the Philippines, Thailand, Vietnam and South Korea. Also see:.
do you upgrade the RAM in the 'Early 2008' (Harpertown/Penryn) Mac Pro? What type of RAM does it use? How much RAM does it actually support? Is it backwards compatible with RAM from the original Mac Pro?. do you upgrade the RAM in the 'Early 2009/Nehalem' Mac Pro? What type of RAM does it use?
How much RAM does it actually support?. do you upgrade the RAM in the 'Mid-2010' and 'Mid-2012' (Nehalem/Westmere) Mac Pro models? What type of RAM do these models use? How much RAM do they actually support?.
I purchased 3 sticks of 1066Mhz DDR3 ram for my 3.2Ghz Nahalem Mac Pro. The sticks were perfect and have the temperature sensors on board, it's hynix ram and is ECC Registered.
I decided to buy a fourth stick making 16GB 4x4GB - When I installed the fourth stick the Mac down clocked the ram to 800mhz! Any idea why?
Or better yet, how to get it running at 1066mhz again? I have tried using the new stick on its own and it's fine running along at 1066Mhz, if you add a fourth stick with any module being that fourth stick it auto downclocks the ram. The Mac pro uses a triple channel memory controller that is optimized to use three DIMM's. Adding the fourth DIMM forces the CPU to split the memory bandwidth between the third and fourth DIMMs, which drops the effective throughput to those DIMMs. The vast majority of applications don't saturate the memory bandwidth. If more memory is a priority I would not worry about lower memory speed. To get it back up to 1066Mhz speed would have to remove fourth DIMM and use 8 GIG DIMMS.
Not sure if mixing of different size DIMMS in the three channels will effect anything. That should not be happening. I am running 4x4GB sticks for 16gb@1066 on a 2009 MacPro Quad. IF your original set is a triple channel part, you must add an identical part to make it properly function. I had a similar issue adding in a part of OWC that was not matched, except my MacPro would not even boot up. Once I had the right chip, I was running just fine. Based on the benchmarks, the benefits in triple channel vs dual channel are so insignificant, it was more of marketing hype than anything that equates to a measurable boost in the user experience.
![Macpro3 16gb (4x4gb Memory Ram For Mac Macpro3 16gb (4x4gb Memory Ram For Mac](https://www.picclickimg.com/d/l400/pict/202366364045_/Micron-16GB-4x4GB-PC2-6400F-800-MHz-Memory.jpg)
That should not be happening. I am running 4x4GB sticks for 16gb@1066 on a 2009 MacPro Quad. IF your original set is a triple channel part, you must add an identical part to make it properly function. I had a similar issue adding in a part of OWC that was not matched, except my MacPro would not even boot up. Once I had the right chip, I was running just fine. Based on the benchmarks, the benefits in triple channel vs dual channel are so insignificant, it was more of marketing hype than anything that equates to a measurable boost in the user experience. Ram itself is not 'triple-channel'.
Ddr3 16gb Ram
Thats just marketing dust on the kits they sell. As long as the rank-type and size are equal, you can mix any ram from any brand you like and maintain triple channel support.
![Macpro3 16gb (4x4gb memory ram for macbook pro Macpro3 16gb (4x4gb memory ram for macbook pro](https://www.picclickimg.com/00/s/OTUwWDk1MA==/z/PasAAOSw5cNYQtoH/$/16GB-4x4GB-PC2-6400-DDR2-800-Non-ECC-Desktop-Memory-Low-_1.jpg)
Thats a chipset feature and not bound to certain ram modules. If, however, you add a fourth module the triple channel access to ram is no longer supported, as #3 and #4 have to share a lane. But again, this happens also when adding a module from a ram kit labled 'triple channel bla kit'. Ram itself is not 'triple-channel'.
Thats just marketing dust on the kits they sell. As long as the rank-type and size are equal, you can mix any ram from any brand you like and maintain triple channel support. Thats a chipset feature and not bound to certain ram modules. If, however, you add a fourth module the triple channel access to ram is no longer supported, as #3 and #4 have to share a lane.
But again, this happens also when adding a module from a ram kit labled 'triple channel bla kit'. My first Mac Pro Quad has always run with 4 x 4 @1066 Mhz. About a week ago, I picked up a large amount of Hynix 4 GB chips and yesterday a 2nd Mac Pro arrived.
I popped in 4 of the new sticks and sure enough, everything dropped to 800 mhz and back to 1066 mhz when I removed the 4th stick. I spent half a day (literally) trying to figure out what was wrong before I stumbled upon this post. I figured out on my own that the sharing of the 3rd & 4th sockets with 'some' RAM brought everything down to 800mhz. But I also found out that 'apparently' I could use 2 sticks of the 'new' RAM in slots 1 & 2 and 2 sticks of the 'old' RAM in slots 3 & 4 and end up with 1066mhz registering.
![For For](https://www.macram.com.au/media/catalog/product/cache/1/small_image/330x330/9df78eab33525d08d6e5fb8d27136e95/d/i/dimmx4_1_10.jpg)
Two questions: 1) Is the RAM that down regulates to 800 Mhz called 'quad core', and, if so, what type of RAM doesn't do that? 2) Is it ok (wise) to mix and match to get to 1066 Mhz. Seems like a cheaper alternative to use a 50/50 split. Click to expand.If it works, it works.
My guess would be that it works on the Mac Pro because there is nothing put it place in the EFI to handle the situation so if it isn't going over the number of memory ranks the memory controller can access at 1066MHz then it won't downclock. On other boards the limit appears to be 12 ranks at 1066MHz. Either 3xQR or 6xDR. They likely set it in the BIOS that using QR and DR together drops it to 800MHz. 2xQR and 2xDR of course is 12 ranks total on a Mac Pro.
Low cost options for 2009 2.66 Nehalem Quad Before getting this MP, I am trying to estimate the immediate additional cost and one of course is memory, as it 'boasts' meager 3GB (3x1GB). Based of the info above, if I get the original memory (e.g. From somebody upgrading), then having 4x1GB, the clock speed will be maintained but the memory will be accessed on two channels only, correct? Or, I can remove 1 stick and get two 3GB ones, for an arrangement 2x1 and 2x3 for a total of 8GB. Not certain whether this would impair something. (8GB should be enough for me).
Before getting this MP, I am trying to estimate the immediate additional cost and one of course is memory, as it 'boasts' meager 3GB (3x1GB). Based of the info above, if I get the original memory (e.g. From somebody upgrading), then having 4x1GB, the clock speed will be maintained but the memory will be accessed on two channels only, correct? Or, I can remove 1 stick and get two 3GB ones, for an arrangement 2x1 and 2x3 for a total of 8GB.
Not certain whether this would impair something. (8GB should be enough for me). It is 'quad-ranked'. Other types are dual-rank and single-rank. You may see it as SR, DR or QR withing a model name or list of specs. If it works, it works.
My guess would be that it works on the Mac Pro because there is nothing put it place in the EFI to handle the situation so if it isn't going over the number of memory ranks the memory controller can access at 1066MHz then it won't downclock. On other boards the limit appears to be 12 ranks at 1066MHz. Either 3xQR or 6xDR. They likely set it in the BIOS that using QR and DR together drops it to 800MHz. 2xQR and 2xDR of course is 12 ranks total on a Mac Pro.