![]() ![]() Crucial even offers a free tool to perform a test and has worked for my team quite well. So when in doubt match to the exact memory recommended by the manufacturer. ![]() So many times I have seen "professionals" upgrade system memory with mismatched latency or worse causing issues that were not there before the upgrade. When mismatching issues occur the systems memory allocation becomes very unpredictable and often unstable. According to Mactracker, your MacBook 13-inch, Early 2009 (A1181, early 2009) can handle 6 GB RAM, or 2 GB more than Apples 4 GB spec. In any event, your clarification of the use of identical size memory sticks is a very important one and often misunderstood. I have noticed that the newer Intel HD 4800 does auto allocate much more memory than the older HD 3000 did. Additionally I Core systems that used the on-chip integrated video (Intel HD), which although similar in concept is structurally very different, and is controlled by software rather than firmware, utilizes (if memory serves) 64MB as the default memory allocation integrated into the chips cache. Most video cards (at least AGP, PCI & PCIe) use a specified amount of system memory above the 640k floor consumed by the interrupts, with PC's this is managed in the system BIOS (although many newer systems omit these settings, unless you use the advanced settings), with the exception of newer APU boards. The standard use of the initial 640k of RAM is still used today for x86 class system boards. It is also true that the system interrupts also consume a certain amount. Although the 2011 chipset does max out at at somewhere north of 92 GB, I believe that outside of the MacPro this is not an option.Įxcellent update! It is very true, I neglected to mention the VRAM memory management with the older chipset does consume a certain amount of system memory. The MAC customized boards stayed with the same chipset through the change to the next generation of Intel CPU's (the I Core) then changed several times from 1150 through 2011 chipsets (most supporting > 8 GB DDR3). The RAM is a limitation of the chipset itself, having nothing to do with the CPU socket itself. This really doesn't matter much with the exception of the limitations with CPU upgrades. Although there are many possible chipset options offered (especially during the transitional period from PPC to Intel Core 2), the Macintosh boards offered mostly soldered CPU/GPU configurations in place of ZIFF (Socket T/775). The specifications for this chipset allows a maximum of 4 GB system memory. Although many manufacturers configured the systems with 3 GB's of memory (as the upgrade from 2 GB), that was never this chipsets maximum memory. These specific boards are similar to the G31 chipset boards produced by many manufacturers. When I press again and hold the button the white and the red light come on, usually also the startup chime sounds, and then the. When I press the power button the white light comes on for a short time and goes off again. 2x 2GB SODIMM's with absolutely no issue. My Power Mac (2x2GHz G5, Late 2005 model) is acting strange since a couple of days when I want to start it up. I can confirm this latest answer, I have upgraded several Core 2 Duo's (to include Macbook Pro & iMac) to 4 GB RAM. ![]()
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