That could mean a significant performance gain for programs that use large amount of memory, like Photoshop. Dual-rank modules offer slightly more performance than single-rank modules.
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Observe that four dual rank modules provide twice the bandwidth of two single-rank modules. Recommendations —. There are 8 memory slots.
So there can be 2, 4, 6 or 8 modules installed. The riser boards are labeled as to which slot is which. The performance of any specific program might or might not benefit from the optimal configuration, but some programs certainly will. Bear in mind that paying for a faster CPU eg 3.
Apple Mac Pro Compatible Memory / RAM / SSD Upgrades
The claim is that filling all 8 memory slots will in theory reduce memory performance over using just 4 slots due to the nature of the serial data transfer in an FB-DIMM—increased latency of nanoseconds. Furthermore, Photoshop test results show clearly that such theoretical concerns are a waste of time; performance for any challenging task depends on the total amount of memory.
For more on the virtues of ECC memory see the Jan 24, diglloyd. Memory becomes less reliable as it heats up. Nearly all computer designs address this problem the straightforward way—by running fans at obnoxiously loud levels—appropriate for a room full of servers, but inappropriate for a home, or for video or sound processing. The whisper-quiet design of the Mac Pro precludes the noisy fan solution. Instead, Apple specifies the use of substantial heat sinks on the memory modules, which draw heat away from the memory chips, and allow a relatively low fan speed to keep them at a reliable operating temperature.
A problem develops if the memory that is installed in the Mac Pro has inadequate heat sinks; the module will become quite hot and memory errors can begin to occur. This is what occurred with one of four modules I originally purchased from SATech. But ECC memory can correct only 1 bit per byte; errors in two or more bits per byte can be detected but not corrected, and the system would crash. Note that 2GB modules can be expected to run warmer than MB modules, because they have twice the memory density and twice the chips 4X the capacity.
However, as memory chip technology evolves, newer modules even higher capacity ones end up reducing chip count; as of November there are 4GB modules with the same number of chips as once were used on 1GB modules. See the Memory installation section earlier in this document. That is precisely what the MemoryTester run-stress-test command does.
The MemoryTester utility is a bit program, and can test all available memory. Of the above, one of the SATech standard modules exhibited ECC memory errors and all four were exchanged for the 3 modules—see the March 7, blog entry for details. The remaining modules have never shown ECC errors during stress testing or otherwise. The program Hardware Monitor was used to observe memory module temperatures as well as ambient temperature and the various fan speeds; these items all have internal temperature sensors which can be read by a program such as Hardware Monitor.
Originally extremely expensive, even 16GB is now a fraction of the price of a Mac Pro. While Apple offers top-quality memory, it comes at a daunting price even as memory prices have dropped. Fortunately, there are lower-priced alternatives which perform as well, and remain reliable under severe operating conditions. Prices as of November are historically low and there is a good chance that memory prices could as much as double later in most memory producers are now losing money on everything they sell.
However, all eight slots will then be full. See How to Configure a Mac Pro. The build quality looks just like the Apple modules, but pricing is far more attractive. OWC has these modules manufactured to their specifications. See what OWC has to say about how they build and test their memory modules. Users with 2nd-generation 8-core Mac Pros should get MHz memory.
The NetList module heat sinks seem somewhat skimpy by comparison, with a narrow point of contact between the heat sinks and the memory chips. This was initially of some concern, but it did not seem to affect their ability to maintain about the same operating temperature as the SATech bi-color memory when tested temperatures are as reported by temperature sensor on the module itself. These modules are nicely built, with substantial heat sinks. The MB modules are single- rank , and slightly lower in performance than dual rank modules, even when used as a group of four.
These modules have inadequate heat sinks that developed ECC memory errors when stress-tested. These modules are not appropriate for the Mac Pro, and were designed for high airflow servers. These modules have heat sinks that are even more substantial than those on the Apple modules. Exactly identical to modules you would buy From Apple both in spec and heat sink used.
Apple Mac Pro Compatible Memory / RAM / SSD Upgrades
This what we will sell from now on when anyone orders Factory Approved Memory. Excellent alternatives to Apple-supplied memory are available at far lower cost times less expensive than Apple. The bottom line is that in 19 months of heavy use of my Mac Pro, I've had zero trouble using alternative memory. Get high quality memory from a 3rd-party vendor, such as OWC , and save a bundle! Pull the optical drive mounting cage located top left as you look at the machine on its side away from the machine, detach the power and IDE cables to allow it to be completely removed.
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The existing optical drive is secured by four screws and can be easily removed or replaced. A second drive can also be mounted in the free bay. Reconnect power and IDE cables - note, the first middle IDE connector should be used for the top drive - and replace the mounting cage in the machine. Fitting is easy since all the bays are readily accessible. If you don't want to fit a new hard drive yourself, you can take advantage of the MacUpgrades Installation Service. Add the installation service from the list below to your cart along with your chosen hard drive.
We can also clone your existing hard drive onto the new one, simply add the Clone Original Hard Drive service below to your cart. Once you have booked the service, send your machine to us, we will carry out the work and return it to you. Alternatively, we do offer a Collection Service with our courier, please see here for details.
For detailed instructions on installing internal hard drives in the Mac Pro, see this pdf on Apple's website. The four hard drive bays are in a horizontal row below the power supply and optical drive bays. There is no need to mess around with cables, the drives can be just slid in and out. Slide out a drive tray - empty if installing an additional drive, or the one containing the drive you wish to replace. Listed below are the compatible products that we sell. Install software, Turn off Machine, open side door. Remove the existing graphics card from its PCI-Express slot, and insert the new card in its place.
If you are unsure call or email our team. Apple's installation instructions can be found here. Locate a free PCI-Express socket and remove holding screw. Replace card with new Card - If you are unsure call or email our team. Listed below are power supplies, batteries and related products we supply for this Mac.
Any complete machines of this type or similar that we have for sale are listed here. Please note that these are refurbished models with a 3 month warranty, and that delivery is likely to take 3 - 5 working days. These can be purchased online with the standard website courier delivery charge for the mainland UK only. Please contact us for a quote on shipping to other areas. Here are the various repair services we offer for this Mac. You can have us take the machine in for evaluation, or book a fixed-price repair if you already know what the fault is and the service is listed below for services without parts, please see the relevant tab on this page for compatible parts that we sell.
If you know what the fault is, but we don't have a fixed-price repair listed below, please contact us for a quote. At Your location Macupgrades offers a wide range of on-site services for your Apple equipment.
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All our engineers have at least 15 years of experience with Apple hardware and software Fixed price on-site upgrades and repairs Full liability insurance Full details of on-site services. Serial Number Search Enter your serial number into the box below for specific upgrades for your machine. If you can't boot your Mac If your Mac is not working, the serial number is printed on the computer casing but the location varies.
Unibody MacBook Pro - Laser etched onto the base. Remove battery to locate. To lift keyboard, pull back on the release tabs between the F-keys. Mac mini - On the underside of the Mac mini.
Mac Pro - On rear of machine near graphics card ports. PowerMac G5 - On lower chassis under side panel. To remove side panel, lift lever on rear of Mac. If you want specific upgrades for your exact model, choose it from the Model ID links below, or enter your serial number here: Where is my serial number? If you are still unsure you can contact us on or by email for confirmation. Disks can be mounted and read, but movie playback requires third party software. Turn off the machine and remove the side access panel.
Shut down the computer and remove the side access panel. Fit the new drive s with the screws which are already in position.
Apple Memory // Mac Memory Upgrade
Slide the drive bay back in until you feel it snap into position. Restart your Mac and format the new drive with Disk Utility. Complete Machines - Refurbished Any complete machines of this type or similar that we have for sale are listed here. Repair Services for this Mac Here are the various repair services we offer for this Mac. All offers Exclude Errors and Omissions.