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FB ECC DDR2 memory at 90 degree's?

post #1 of 8
Thread Starter 
Hello all,

As the title states, i've got some memory reaching quite concerning temperatures. As i have no experience with FB dimm's (I've got ECC in other machines that are fine), but this high temp has me quite alarmed. Should FB or ECC memory ever reach this high?

Hynix 16GB (4x 4GB) PC2-5300F DDR2 667 MHz (HYMP151F72CP4N3-Y5 AC)



Norco 2016 chasis (stock fans), Intel S5000PSL /w 2xDC 3.0GHz 5160's. No load, bios after 9 minuets.


Thoughts?

Thanks smile.gif
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post #2 of 8
As far as I remember, EEC registered DDR2 gets insanely hot, and needs airflow. Remember reading it from some people who had the Skulltrail motherboards with the same RAM, and all of them said the RAM gets crazy hot without airflow.

Get a fan on that ASAP. Or, better, some sort of RAM fan:

memcroundb.JPG
    
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post #3 of 8
Is that in Fahrenheit or Celsius? If it is Fahrenheit that is fine, if its Celsius then you have an issue. The Tcase max for ECC ram is 95C.
Edited by ionstorm66 - 9/16/13 at 7:20am
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post #4 of 8
Thread Starter 
I cant believe that this memory is getting that hot.. according to the data sheet's the tmax is 100c... so if it was running that hot all the time, why would they have the tmax to 9/10th's of it operating temperature? I do understand that these are server memory and should be kept in a cold server room, but that seems a bit obscene to me? I've taken it down to 2 dimm's with 71-78 about's. I am also considering buying another brand of memory with the same size to use as a control, to see if its the memory or the way they run?

Height is at a premium so i'll have to look at a low profile solution?

Thanks for the quick response!
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by ionstorm66 View Post

Is that in Fahrenheit or Celsius? If it is Fahrenheit that is fine, if its Celsius then you have an issue. The Tcase max for ECC ram is 95C.

This is in Celsius, and from what i read, the tmax was 100c. worriedsmiley.gif
Edited by Anteries - 9/16/13 at 7:45am
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post #6 of 8
Quote:
Originally Posted by Anteries View Post

I cant believe that this memory is getting that hot.. according to the data sheet's the tmax is 100c... so if it was running that hot all the time, why would they have the tmax to 9/10th's of it operating temperature? I do understand that these are server memory and should be kept in a cold server room, but that seems a bit obscene to me? I've taken it down to 2 dimm's with 71-78 about's. I am also considering buying another brand of memory with the same size to use as a control, to see if its the memory or the way they run?

Height is at a premium so i'll have to look at a low profile solution?

Thanks for the quick response!

All FB-DIMMs run very hot so no use looking for a different brand. My advice is to get a system that uses DDR3 ECC RAM. If not, replace the fans in the server with more powerful ones and lower ambient temps.
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post #7 of 8
Fully Buffered ECC DIMMS are only rated for use in systems with FORCED AIR FLOW over the RAM. Not usually a problem in a server application where every properly designed server chassis has redundant cooling blowing over the CPU and RAM area.

Yes, they do get to 90C+ without forced air cooling, and they will begin to develop errors.

Go look at the historical information about the Apple Mac Pro towers from 2007. Those were among the first consumer-grade workstations with FB-DIMMs in them, and they had funky triple-wide heat sinks on the DIMMS with dedicated fans blowing across them. Some people had tried replacing the RAM with non-Apple, server-grade FB-DIMMS and they failed without jacking the fan speed up to extremely high levels. The FB-DIMMS overheat because they have a high-powered IC on them that runs about 10W all by itself.

If heat is an issue, see if you can run ECC Registered DDR2 DIMMs in that motherboard. They don't have FB-DIMM buffer chips on them and run considerably cooler. Of course, you might be limited to a smaller maximum RAM amount w/o the buffers.

Greg
post #8 of 8
Quote:
Originally Posted by hammong View Post

Fully Buffered ECC DIMMS are only rated for use in systems with FORCED AIR FLOW over the RAM. Not usually a problem in a server application where every properly designed server chassis has redundant cooling blowing over the CPU and RAM area.

Yes, they do get to 90C+ without forced air cooling, and they will begin to develop errors.

Go look at the historical information about the Apple Mac Pro towers from 2007. Those were among the first consumer-grade workstations with FB-DIMMs in them, and they had funky triple-wide heat sinks on the DIMMS with dedicated fans blowing across them. Some people had tried replacing the RAM with non-Apple, server-grade FB-DIMMS and they failed without jacking the fan speed up to extremely high levels. The FB-DIMMS overheat because they have a high-powered IC on them that runs about 10W all by itself.

If heat is an issue, see if you can run ECC Registered DDR2 DIMMs in that motherboard. They don't have FB-DIMM buffer chips on them and run considerably cooler. Of course, you might be limited to a smaller maximum RAM amount w/o the buffers.

Greg

This exactly. They get pretty hot to the touch even in my Dell CS23's which are rammed with high speed fans.
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