MP 1,1-5,1 Cpu Fan speed ramp up when ram upgrade!

[salmonoficial]

HI! I'm having a problem with my mac 4,1>5,1 flashed and with GOP enabled

I recently upgraded to 16GB of ram

The system is reading the memory fine but as son as the system tries to boot and post it ramps up the cpu fan. I have tested each memory one by one and they are fine, also the CPU was repasted a month ago, it is working fine.

Here is a video attached(when less than 16gb of ram the fan runs normally)

 

[tsialex]

RDIMM vs UDIMM? Can't use both at the same time.

 

[salmonoficial]

RDIMM vs UDIMM? Can't use both at the same time.

All Rams are UDimm

 

[salmonoficial]

RDIMM vs UDIMM? Can't use both at the same time.

Oh, I just checked and one of the sticks is PC3L (others are just PC3) can that be the problem?

 

[tsialex]

All Rams are UDimm

All DIMMs are ECC? You can't mix ECC and non-ECC.

Also boot one by one and check if there are no ECC errors with SysPref/Hardware/Memory.

Oh, I just checked and one of the sticks is PC3L (others are just PC3) can that be the problem?

Sometimes can be, time to test.

 

[salmonoficial]

All DIMMs are ECC? You can't mix ECC and non-ECC.

Also boot one by one and check if there are no ECC errors with SysPref/Hardware/Memory.



Sometimes can be, time to test.

Hi!All Dimms are Non-ECC

 

[tsialex]

Test one by one with ASD extended test or even memtest86, without ECC you won't know if one have a problem.

I don't need to write that you are using the wrong type of DIMMs, and worse, mix-matched, no?

 

[salmonoficial]

Test one by one with ASD extended test or even memtest86, without ECC you won't know if one have a problem.

I don't need to write that you are using the wrong type of DIMMs, and worse, mix-matched, no?

I don't understand about the wrong type of Dimm, I have 2 Samsungs and 2 Microns

The thing is one is DDR3L , is a Samsung one, the microns are the same

 

[tsialex]

The correct type of DIMMs for a MacPro5,1 are UDIMM ECC or RDIMM ECC.

Without ECC, the memory controller cannot detect memory errors and simply crashes when a problem occurs, whereas with ECC most memory errors are corrected and crashes are avoided. Another problem with not having ECC is that you need to test each DIMM module for errors and then the combination of all modules, which can be a very long and tedious process.

While it's not an explicit requirement that DIMM modules need to be identical, it's a very common practice to avoid compatibility issues.

 

[salmonoficial]

Ohhh I understand, thanks!

After some restarts the problem just disappeared, I ran a Memtest with each ram and I think they are OK so.. I will continue the testing and inform you

Thanks for the help!