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I tested the speed of various combinations. 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. 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.
Mac Pro Memory: Choosing, Installing, Testing
Bear in mind that paying for a faster CPU eg 3. 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.
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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.
Mac Pro Eight-Core GHz | Macworld
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. 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.