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Server Memory Question

Bonn
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Posted

So,

I have an awesome little project at work and would like to see if anyone knows of some good calculators or has experience in this.

We're looking to purchase a whole bunch of Dell M620 blades equipped with 2.5GHz 10 Core Xeons. We're fine on the specs, however this has been a concern raised regarding the performance of the memory in two configurations.

 

Config 1

2x 10 Core Xeons + 512GB 1600MHz RDIMMS

 

Config 2

2x 10 Core Xeons + 768GB 1333MHz LRDIMMS

 

What sort of performance difference will we see?

 

FYI, This is for a v-stack ( v-sphere,centre,cloud )

 

Dell are "working on it" but I'd like to see an opinion here.

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What series Xeons are we talking here? 

Main Rig: White Lightning  = -Intel Core i7 3770 (4.1Ghz)-Zalman CNPS12X-MSI Z77A-G45-16GB G2 Patriot-MSI GTX 660TI OC PE-Corsair 650W-Corsair 600t White-

Laptop: MSI GT60 = -Intel Core i7 4700MQ-MSI GTX 770M-

Peripherals: Corsair K90-Corsair M90- Corsair 2100-CM Storm Quickfire TK (Green Switch)-Logitech G700

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The 768GB of 1333MHz will be better. The additional 267MHz will make a small impact on bandwidth, meaning almost no performance difference. LRDIMMs have a buffer chip on the pcb that reduces loading factor and can accommodate more flash than traditional RDIMMs

 

lrdimm_a.jpg

[AMD Athlon 64 Mobile 4000+ Socket 754 | Gigabyte GA-K8NS Pro nForce3 | OCZ 2GB DDR PC3200 | Sapphire HD 3850 512MB AGP | 850 Evo | Seasonic 430W | Win XP/10]

 

 

 

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The 768GB of 1333MHz will be better. The additional 267MHz will make a small impact on bandwidth, meaning almost no performance difference.

 

^

This is your best answer

Mainboard Asrock Z170 OCF CPU 6700k RAM Tridentz 3600 HDD Intel 730 240gb GPU GTX 780ti sc acx PSU Silverstone Strider 1200W  Case Antec 900 Laptop Lenovo Thinkpad T520 build log-   http://linustechtips.com/main/topic/35809-antec-900-the-re-birth-of-a-legend/ Check out the Tech Center https://www.youtube.com/user/prokon24/videos LTT's Unicore King

 

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E5-2670V2 - 130W variant.

These are going to be super busy servers, and everything is reliant on memory. Anyone know of calculators or performance charts?

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heres a good overview

 

http://www.anandtech.com/show/6068/lrdimms-rdimms-supermicros-latest-twin/5

Mainboard Asrock Z170 OCF CPU 6700k RAM Tridentz 3600 HDD Intel 730 240gb GPU GTX 780ti sc acx PSU Silverstone Strider 1200W  Case Antec 900 Laptop Lenovo Thinkpad T520 build log-   http://linustechtips.com/main/topic/35809-antec-900-the-re-birth-of-a-legend/ Check out the Tech Center https://www.youtube.com/user/prokon24/videos LTT's Unicore King

 

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Well. Just got a interesting reply from Dell.

To populate the M620 with 768GB, the CPUs must not consume more than 95W. So, Pretty much, I'd have to go to 8 core CPUs and lower clocks for 768GB, since the 2670s are 130W. I get faster memory speeds at 512GB, better QPI speeds with 10 cores and a good clock speed too.

512GB does the job, we'll just get more!

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