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ECC RAM with 130ns latency

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January 5, 2013 4:27:14 PM

I'm running dual AMD 6272's with windows 7 PRO on a Supermicro H8DG6-F Opteron 6000 G34 SP5100 DDR3 ECC LSI RAID SATA SAS 6PCIE 2GBE

I have 64GB (16 * 4GB) of Kingston KVR13LR9D8/4HC 4GB 1X4GB DDR3-1333 DDR3 CL9 ECC Reg 1.35V DIMM DR X8 Hynix C

Passmark gives the RAM terrible scores (overall 731) as well as

MaxxMEM:

Memory Copy :8467
Memory Read: 6438
Memory Write: 5687

Latency 108.8 (usually 130ns, this is the best I've seen)

Reached memory score 5.97 GB/sec.

The system has lots of power and 2 SSD drives in RAID 0

Is this RAM running at acceptable speeds?

More about : ecc ram 130ns latency

January 6, 2013 4:16:36 PM

Anyone have experience with ECC RAM speeds?
a c 79 } Memory
January 6, 2013 5:06:59 PM

If you check the few AMD systems at http://www.techpowerup.com/forums/showthread.php?t=1241..., there probably is nothing wrong with your system. You may not get very high transfer rates with that setup, but you're not limited to 4 modules. You may not be able to find a test performed on a dual-Opteron server and I'm not convinced that benchmark is accurate for dual socket servers.
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January 6, 2013 5:57:41 PM

GhislainG said:
If you check the few AMD systems at http://www.techpowerup.com/forums/showthread.php?t=1241..., there probably is nothing wrong with your system. You may not get very high transfer rates with that setup, but you're not limited to 4 modules. You may not be able to find a test performed on a dual-Opteron server and I'm not convinced that benchmark is accurate for dual socket servers.


Didn't see any Opteron's...

When you say "that setup" where do you think the problem lies with my current configuration?

What would you recommend?
a c 79 } Memory
January 6, 2013 7:07:05 PM

Do you have a performance issue that prompted you to run that benchmark? Again it probably isn't optimized for a multi-socket server.

Have you tried different settings (Advanced, Memory Configuration)? Are they like this? http://www.servethehome.com/wp-content/uploads/2011/05/...
January 6, 2013 7:28:32 PM

GhislainG said:
Do you have a performance issue that prompted you to run that benchmark? Again it probably isn't optimized for a multi-socket server.

Have you tried different settings (Advanced, Memory Configuration)? Are they like this? http://www.servethehome.com/wp-content/uploads/2011/05/...


Upon receipt I benchmarked system to test performance with passmark. Results are not great.

It passes all tests though, ie Lintest, Cinebench, etc no failures

I have custom application that was running well on a single 3930 but wanted something with more cores for the parallel processing.

I'm debating Xeon's 2630's or a single 3970X now since the application does not seem to run well on current config.

I cannot comment on BIOS settings as I don't have the system right now, it's back at retailers (I can remote in though).

I'm hoping I can tweak some settings to see better performance?

Since my app does a lot of "in memory" processes, I think the slow RAM is the bottleneck or that Opteron's on a single cpu are slow.

Can you recommend any BIOS adjustments/tests?
January 6, 2013 9:57:35 PM

GhislainG said:
I'm not familiar with AMD based servers. Did you contact Supermicro? They should know how to optimize memory performance on that motherboard. As an example, HP provide info about memory configurations: http://h20000.www2.hp.com/bc/docs/support/SupportManual...

It won't help you much, but it's worth reading: http://www.anandtech.com/show/2978/amd-s-12-core-magny-... http://www.admin-magazine.com/HPC/Articles/Exploring-th...


I plan on speaking with AMD, Supermicro and Kingston this week.

In reviewing the document from HP, I see something that refers to loaded and unloaded latency, do you or does anyone know what that means exactly?

Seems loaded latency of 130ns is normal.

January 6, 2013 10:00:39 PM

Found this:

There are two different measurements of memory latency for a system— unloaded latency and loaded latency.
• Unloaded latency is the fastest possible time for the processor to retrieve data from the memory subsystem. It is measured when the system is idle. The timing and electrical properties of the memory subsystem determine unloaded latency.
• Loaded latency is a measurement of the latency when the memory subsystem is saturated with memory requests. With loaded latency, many additional factors come into play, including the number of memory controllers in the memory subsystem; controller efficiency in handling queued requests; and memory interleaving. Loaded latency gives a truer representation of the memory subsystem’s capabilities in real-world environments.

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a c 79 } Memory
January 7, 2013 12:28:22 AM
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130 ns probably is normal, but if memory access speed is of prime importance, then the 3970X with the fastest memory that it supports might better meet your requirements. ECC Registered memory can't be as fast as DDR3-2400 modules like http://www.newegg.com/Product/Product.aspx?Item=N82E168... It sure is a lot of non-ECC memory and you'll know how much faster it is only once you build it.
January 7, 2013 2:49:13 PM

Best answer selected by reiddar.
January 7, 2013 2:50:32 PM

I think I will go for the i7 3970X with non-ECC RAM, maybe even that kit you suggested.

Thanks for the help.
a c 79 } Memory
January 7, 2013 5:08:33 PM

Which motherboard will you buy?
!