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Old 31st July 2017, 11:57 AM   #1
mrjayviper Thread Starter
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Default registered ECC DDR3 sticks: do they get hot compared to desktop counterparts?

I was looking for RAM for an Intel server board and I came across a Hynix one with the word "HOT" in the heat spreader. I know desktop RAMs also comes with heat spreader but I've never seen them carrying a similar warning.

My only experience with server RAM is from an old Apple Mac Pro which uses FBDIMM and they also also carry the same warning.

I've looked at eBay and there are server RAM with and without heat spreaders.

just wondering if heat spreaders are a necessity for server RAM?

Thanks

edit: added pics. The samsung sticks (at least according to my search) are the low powered versions 1.35V instead of 1.5V)



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Old 31st July 2017, 7:44 PM   #2
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I run 16gb ddr3 ecc modules and they all have heat spreaders, made the mistake of gong to remove one immediately after powering down the server... they burn.
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Old 1st August 2017, 8:04 AM   #3
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You'd generally find all DDR3 or DDR2 ECC Registered modules bigger than 2GB will have heatspreaders, they run much hotter than desktop RAM because they have more circuitry on the actual RAM module pcb.
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Old 1st August 2017, 12:10 PM   #4
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fully buffered ram with the buffer gets hot, hence heat spreaders. non buffered ecc doesn't.
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Old 1st August 2017, 4:27 PM   #5
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fbdimm ddr2 gets silly hot, most ecc ddr3 registered i see don't have heatsinks - 1/2/4/8/16/32's
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Old 1st August 2017, 6:24 PM   #6
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Depends on the density of the modules.

2Rx4 modules almost always tend to have heatsinks due to the larger array of chips on both sides and the larger amount of heat they put off.

Old school FB DDR2 put off a stinking amount of heat (old technology), I can't remember the amount of times I burnt myself by changing the ram out of old HP DL380 and Dell Poweredge 2950 servers.
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Old 1st August 2017, 7:19 PM   #7
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Quote:
Originally Posted by Matthew kane View Post
Depends on the density of the modules.

2Rx4 modules almost always tend to have heatsinks due to the larger array of chips on both sides and the larger amount of heat they put off.

Old school FB DDR2 put off a stinking amount of heat (old technology), I can't remember the amount of times I burnt myself by changing the ram out of old HP DL380 and Dell Poweredge 2950 servers.
Chip count means nothing. FB DIMMs have the buffer on the DIMM which is why they have the heat spreader. non FB DIMMs have the buffer on the chipset/IMC which is why they don't have heat spreaders.
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Old 1st August 2017, 8:28 PM   #8
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Quote:
Originally Posted by terrastrife View Post
Chip count means nothing. FB DIMMs have the buffer on the DIMM which is why they have the heat spreader. non FB DIMMs have the buffer on the chipset/IMC which is why they don't have heat spreaders.
By chip count I'm talking about the entire IC's across the dimm of FB/registered memory, taking in count with the buffer in the centre of the dimm module. Not in relation to desktop or non buffered 2Rx4/8 memory, since we are talking about ECC registered memory here.
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Old 2nd August 2017, 8:33 AM   #9
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Quote:
Originally Posted by Matthew kane View Post
By chip count I'm talking about the entire IC's across the dimm of FB/registered memory, taking in count with the buffer in the centre of the dimm module. Not in relation to desktop or non buffered 2Rx4/8 memory, since we are talking about ECC registered memory here.
You can get unbuffered ECC RAM with loads of chips and no heat spreader, like so.
http://www.avadirect.com/32GB-2-x-16...roduct/8746833
The buffer is the only chip that matters, even if the DIMM only has a single bank of chips.
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Old 3rd August 2017, 8:20 AM   #10
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FB-DDR2 (ECC+REG) ram, by JEDEC standards, *must* have a heatspreader!

yes, FB-DDR2 gets that hot. The two rigs that I used to own with FBDDR2 had Hynix with the same caution stamped into the heat spreaders. I ran a hardware monitor app... the sticks idled at ~55-60C
I never ran the rigs without a 120x38mm 3Krpm fan pointing directly at the ram.

FB-DDR2 is the only RAM I am aware of that must have a heat spreader.
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Old 3rd August 2017, 7:11 PM   #11
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pics added

Also plenty of server RAM @ natex.us without heat spreaders
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Old 3rd August 2017, 8:13 PM   #12
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depends if it's 1.5 or 1.35 volts.

got several servers with 192GB DDR3L ECC with no heat spreaders.

my e3 v3 xeon uses unbuffered DDR3L also.
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Old 3rd August 2017, 8:40 PM   #13
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Quote:
Originally Posted by Doc-of-FC View Post

my e3 v3 xeon uses unbuffered DDR3L also.
are you saying the Samsung sticks (the one without heatspreaders in the pics) are unbuffered? If yes, how do you know?

Thanks!
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Old 3rd August 2017, 10:15 PM   #14
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Quote:
Originally Posted by terrastrife View Post
You can get unbuffered ECC RAM with loads of chips and no heat spreader, like so.
http://www.avadirect.com/32GB-2-x-16...roduct/8746833
The buffer is the only chip that matters, even if the DIMM only has a single bank of chips.
I'm well aware that you can buffered sticks without heatsinks. But a vast majority of registered ecc DDR2 and DDR3 (not 1.35v) that are sold online (mostly ebay) are from server pulls and generally all have heatsinks. As mentioned above JEDEC standards require registered ddr2 to have a heatsink and they get stinking hot, early ddr3 (non 1.8v) also have heatsinks.

You also have to understand that every generation of RAM requires less supply voltage (DDR2 - 1.8v, DDR3 - 1.35-1.65v, DDR4 - 1.2v) and due to the constant advancement/development and manufacture of IC technology they use less power and put off lower amounts of thermal heat dissipation, they may or may not require heatsinking.

The ddr4 link you provided is not really a good example since we are talking about ddr3 here, I would not be surprised at all if all buffered/registered ecc DDR4 don't require a heatsink. They require a lower supply voltage, use less and newer parts which consume less power and current draw and put off less heat.

Also all DDR2 and maybe 90% of DDR3 manufactured by hynix for OEM partners (IBM, Dell and HP) all require to have heatsinks and come with heatsinks. I've only seen Elpida and Samsung modules without heatsinks but they are also not the primary RAM supplier for some of the biggest OEM manufacturers in the world.
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Last edited by Matthew kane; 3rd August 2017 at 10:17 PM.
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Old 16th September 2017, 8:23 AM   #15
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There is a fair amount of power which goes into these. Normally servers have big banks of them, 18+ slots. I have seen DDR3 with both.

They are normally warm, but not to the temperatures which make it difficult to handle them, that is normally the FB-DIMMs.
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