Mac ram 1066 vs 1333

Both work at No problems at all!! Were you originally using by default rams and upgraded to 2x 4gb Coz that's the exact upgrade I want to get and I'm using same late model with 2 x 2gb rams.

RAM upgrade from 1066 to 1333 MHz

Ricardo Savaris. I checked and all memory modules are fine. Did you ever resolve? Review your system here: MacBooks. The next thing is to make sure your systems firmware is upto date. During the install process, I got kernel panics left, right and center. I don't know if there is something specific to operating system upgrades that would have caused the problem. Chris Johnson. I have a late macbook unibody and put 2 x 4gb MHz ram in and it worked, but I do get occasional program crashes, especially for games.

With 4GB ram it is fine. There is a different firmware EFI update for the unibody macbook that allows it to work ok with 8GB ram, earlier updates will only support 6GB, any more causes constant system crashes.

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You do need a late version of Leopard at the very least to make it work as well. I think all To make things more awkward, Apple released the updated EFI with the same version number as the old one. You need version MB B03 look under boot ROM in system profiler.

In summary, use the RAM if you want a totally stable machine. In most cases it will actually be faster because it runs at the bus speed. I updated the mac book os to osx I have a mid Macbook Unibody Macbook7,1 I had 2gb of ram to start with, so I wanted to upgrade to 4gb. I went out to grab 2x2gb mhz ram sticks, It did not seems to work - no boot.

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Now my MB is running 8gb mhz but I seem to be hitting some problems lately with alot of system crashes. Does anyone know if 8gb mhz ram cause a system fault? I could not get any 2x2gb mhz ram from where I live. My normal boot OS is I haven't booted it from Yosemite Beta 2 yet; I should try that today Looks like its better to keep at the 4GB level. I have a macbook A series. I bought my laptop from a friend with the trackpad not working, I had just ordered and installed a brand new one and it still wont work.

It just clicks but absolutely no gestures. Anyone know how to get this fixed? Both seem to work just fine. To me it's weird that a newer Mac won't run the newer RAM, but the older ones will.

What effect do RAM clock speeds have on the Mac Pro performance

Does anyone have an explanation for this phenomenon? The MacBook is running Most likely your firmware is the issue not the memory. Peter Trondsen. It seems to run fast, and no problems, except, the fans are running a bit high, so it seems to me that the faster RAM is driving the heat up.

Faster RAM failing in Mac mini

I'm going purchase Mhz RAM, and swap them out to see if that reduces the heat and the fan. I would install a temperature monitoring app to see what sensor is running high here. The memories speed is not likely causing the heat issue. Arvin Santiago. Its running well, better than that, it's running great, however my question is that will this cause my RAM to overheat because it's at MHZ while the system is designed for MHZ? Don't know much about RAM. I suspect its MHz. So in your case the chips heat will be the same or in fact a little lower.

Gaston gastonandrea. Manish Oberai. Thomas pingus. Posted: April I made a guide on how to to underclock memory modules requires a Windows laptop pre-Skylake and that's fairly easy to achieve as long as you follow the step carefully. Help Translate iFixit. Back Answers Index. MacBook Unibody A 13" aluminum unibody, 2. Ben Rep: 1. Thank you. View the answer I have this problem too Subscribed to new answers. Is this a good question? Yes No. Voted Undo. Score 9. Warranty up? Chosen Solution. Was this answer helpful? But this official support is based on the size of the RAM modules that were available when the Mac Pro first went on sale.

If you choose the 16 GB modules, you can only populate the first three memory slots.

Additionally, you cannot mix modules of different sizes; if you choose to use 16 GB modules, they must all be 16 GB. Notice that in the above configurations, slots 4 and 8 are the last to be populated, ensuring the best overall memory performance.

Memory for Mac Pros is available from many third-party sources. The ones we link to here are all reliable and represent just a few of the available choices. These are listed in alphabetical order, not preferential. Share Pin Email. Tom Nelson has written hundreds of articles, tutorials, and reviews for Other World Computing and About. He is the president of Coyote Moon, Inc. So, what does that all mean? SDRAM is synchronous dynamic random access memory. In essence, the RAM and the processor memory bus are synchronized to the same clocking system.

This RAM has a faster clock speed to match the faster memory controller in the 6-core and core processors. Single-processor model. Dual-processor model. Two memory modules: Slots 1 and 2. Three memory modules: Slots 1, 2, and 3. Four memory modules: Slots 1, 2, 3, and 4. Four memory modules: Slots 1, 2, 5, and 6. Six memory modules: Slots 1, 2, 3, 5, 6, and 7.

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