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현재 버전 게시자: Dan ,

본문:

@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:
 
[image|1005524]
 
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.
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:
 
* [https://www.ece.cmu.edu/~ece548/localcpy/dramop.pdf|IBM - Understanding DRAM Operation]
* [https://en.wikipedia.org/wiki/CAS_latency|Wikipedia - CAS Latency]

현황:

open

편집 작업: Dan ,

본문:

@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:
 
[image|1005524]
 
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 likely Apple altered the timing a bit as that might have been one of the alterations Apple appliedneeded to resolve the GPU problem it was facing.
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 likely Apple altered the timing a bit as that might have been one of the alterations Apple appliedneeded to resolve the GPU problem it was facing.
 
References:
 
* [https://www.ece.cmu.edu/~ece548/localcpy/dramop.pdf|IBM - Understanding DRAM Operation]
* [https://en.wikipedia.org/wiki/CAS_latency|Wikipedia - CAS Latency]

현황:

open

편집 작업: Dan ,

본문:

@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:
 
[image|1005524]
 
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 likely Apple altered the timing a bit as that might have been one of the alterations Apple applied to resolve the GPU problem it was facing.
 
References:

[https://www.ece.cmu.edu/~ece548/localcpy/dramop.pdf|IBM
* [https://www.ece.cmu.edu/~ece548/localcpy/dramop.pdf|IBM - Understanding DRAM Operation]

[https://en.wikipedia.org/wiki/CAS_latency|Wikipedia

* [https://en.wikipedia.org/wiki/CAS_latency|Wikipedia
- CAS Latency]

[https://www.ece.cmu.edu/~ece548/localcpy/dramop.pdf|IBM
* [https://www.ece.cmu.edu/~ece548/localcpy/dramop.pdf|IBM - Understanding DRAM Operation]

[https://en.wikipedia.org/wiki/CAS_latency|Wikipedia

* [https://en.wikipedia.org/wiki/CAS_latency|Wikipedia
- CAS Latency]

현황:

open

원문 게시자: Dan ,

본문:

@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:

[image|1005524]

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 likely Apple altered the timing a bit as that might have been one of the alterations Apple applied to resolve the GPU problem it was facing.

References:

[https://www.ece.cmu.edu/~ece548/localcpy/dramop.pdf|IBM - Understanding DRAM Operation]

[https://en.wikipedia.org/wiki/CAS_latency|Wikipedia - CAS Latency]

현황:

open