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Hi, I have a MacBook Pro (13-inch, Mid 2012) I had upgraded the RAM modules of my MacBook Pro to 2133 MHz Using Kingston’s HyperX Impact RAM, I was using these in my system for more then 2 years, a few days back, I had some GPU issues so I removed my HyperX RAM modules and Reinstalled the original Apple RAM and gave it to Apple to repair. Apple has now replaced the Logic Board, I then put back the HyperX RAM back in my system and it only shows me a solid power light when I turn on my Mac. It doesn’t boot up or make any chime noise or anything, I don’t know why this is happening, The HyperX RAM were working fine for so long but after the logic board change out there giving me issues. I even tried my RAM modules in on someone else computer and the RAM works just fine. It’s just not working in my computer! What should I do?
@mohur - When you start using RAM that is beyond the specs of what the system was designed to support you can get into some odd behaviors. Just because a company pushes a product as being better it may not be! Let me explain… Think of it this way a given road has a speed limit of 35 MPH and lets say all of the cars that are on that road are at this exact speed. So having a car, bus, or truck makes no difference! As all of them run at this set speed. Now lets throw in a race car into the mix most can barely go 35 MPH as its just too slow! It spits and sputters as it tries to run at this slower speed. But on the open racetrack it can zoom! RAM modules are very similar! The speed limit of the bus is set, you can’t run faster than the bus (road). Yes, you can put in faster RAM. Doing it with the expectation you are going to get more or better performance is not really realistic. OK lets dig deeper here by looking at the RAM’s CAS speed of your RAM What this system needs and your RAM:
Now look at your modules timing: DDR3-1600 CL9-9-10 @1.35V or 1.5V So depending on the given system’s hardware you may encounter a problem as the range of the faster RAM is not as wide as the slower RAM. Your original systems logic board PCH may have had just enough range to support the faster RAM module unlike your current board. It’s also likely Apple altered the timing a bit as that might have been one of the alterations needed to resolve the GPU problem it was facing. References: IBM - Understanding DRAM OperationWikipedia - CAS Latency
In electronics, or at least Macs, processor and speeds vary in the same model. They are based on minimums. But there are variants. Some run faster than rated and some run at the posted speed. The recommended RAM for your machine is DDR3L at 1600 MHZ. You are really trying to push that. Also slots vary. At this point I would try just one stick at a time and try it in both slots. You may have to go back to the recommended sticks. Can you tell us why you are pushing your machine so hard and give a link as to where it’s listed that this RAM will work in your machine so we can study it a bit.
