2133Mhz CL9 vs 2400Mhz CL10?

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I am building a workstation with dual Xeon, and am selecting out the ram.

Now, what are the differences between these two? I can't tell as the numbers are so close.

I would be getting G.Skill Ripjaws Z ram
1 kit of these http://www.newegg.com/Product/Product.aspx?Item=N82E16820231504&clickid=wJSVAzTomQ-CUXaUm0zZTQwJUkTWQ5xNWw6i0Q0&iradid=97618&ircid=2106&irpid=79301&nm_mc=AFC-IR&cm_mmc=AFC-IR-_-na-_-na-_-na

or 2 kits of these http://www.newegg.com/Product/Product.aspx?Item=N82E16820231586&clickid=wJSVAzTomQ-CUXaUm0zZTQwJUkTWhe0lWw6i0Q0&iradid=97618&ircid=2106&irpid=79301&nm_mc=AFC-IR&cm_mmc=AFC-IR-_-na-_-na-_-na

I was originally going to go with the 2133 but then I found the 2400 ram for ACTUALLY just slightly cheaper.

Just a few add-in questions If I get either kit, would I be able to switch them to each others clocks and CAS?
And would It be possible to OC the 2400 ram to a CAS of 9 -
or the 2133 ram to a CAS of 8 or 2400 CAS 9 or 10?

thank you, sorry if this is off to read-
 
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geofelt

geofelt

Titan
Oct 9, 2006
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1. I would buy ALL the ram in one kit if you want ram vendor support.
Ram is sold in kits for a reason.
Ram from the same vendor and part number can be made up of differing manufacturing components over time.
Some motherboards can be very sensitive to this.
That is why ram vendors will NOT support ram that is not bought in one kit.
Although, I think the problem has lessened with the newer Intel chipsets. Still,
it is safer to get what you need in one kit.
2. I would buy 8gb sticks. It is easier for a motherboard to manage fewer sticks.

3. Ram speed is not very important to Haswell chips, and I presume for Xeon also.
It makes very little difference in app speeds. Lower cas numbers help more.
Read this: http://www.anandtech.com/show/7364/memory-scaling-on-haswell

4. You want documented ram compatibility. If you should ever have a problem, you want supported ram.
Otherwise, you risk a finger pointing battle between the ram and motherboard support sites, claiming "not my problem".
One place to check is your motherboards web site.
Look for the ram QVL list. It lists all of the ram kits that have been tested with that particular motherboard.
Sometimes the QVL list is not updated after the motherboard is released.
For more current info, go to a ram vendor's web site and access their ram selection configurator.
Enter your motherboard, and you will get a list of compatible ram kits.
While today's motherboards are more tolerant of different ram, it makes sense to buy ram that is known to work and is supported.
 
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G

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any specifics why?


the kits are from the same manufacturer.

I wanted to go with the 4GB sticks so I could split them between the two cpus, that way I can utilize quad channel.

I suppose I could get 8GB sticks in dual channel so I have space for more ram (without disposing of the previous kit)
 
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G

Guest

Guest
okay-

here are the smaller kits I would look at

2133 9 4x8GB http://www.newegg.com/Product/Product.aspx?Item=N82E16820231564&clickid=wJSVAzTomQ-CUXaUm0zZTQwJUkTWmzx9Ww6i0Q0&iradid=97618&ircid=2106&irpid=79301&nm_mc=AFC-IR&cm_mmc=AFC-IR-_-na-_-na-_-na

2400 10 4x8GB http://www.newegg.com/Product/Product.aspx?Item=N82E16820231522&clickid=wJSVAzTomQ-CUXaUm0zZTQwJUkTWm10xWw6i0Q0&iradid=97618&ircid=2106&irpid=79301&nm_mc=AFC-IR&cm_mmc=AFC-IR-_-na-_-na-_-na

oh wow- these kits are cheaper than the others...thought it would be the other way around...
 
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G

Guest

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The Intel spec only supports 1600 on Xeons, but the motherboard supports 2133 and I have read users running 2133.

I read mixed results on 2400 though, it'll work on the 6 cores but not the 8 cores it seems...

but would I be better off buying the 2400 CL10, and trying to clock it at 2133 CL8
or the 2133 and overclock it to CL8?

even if I wouldn't be able to use the 2400 ram at 2400, I might be able to get better timings than the other kit with a downclock?
 
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G

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many people have be able to put 2133 ram in it just fine, so I am pretty confident it'll work
 
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G

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if it doesn't...I'll just use MAGIC~~~~

or I could just lower the frequency and CAS...but still...MAGICCCCK
 
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