CAS Latencies...mixed opinions everywhere!!

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rlakhani11

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Aug 8, 2013
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Firstly, a big hello to all my friends.

Now, as the title suggests, I've been searching many a forum for a couple of hours now but not a single place has the exact query as mine, including Tom's.

But I'm posting it here bcoz this place IMO is filled with the most savvy people.

My queries:
1. What's the difference between the memory's SPD latency and tested latency?

2. My rig currently has Corsair Vengeance 8GB (CMZ8GX3M1A1600C9 - tested latency: 9-9-9-24) installed and I want to upgrade it with 8GB more. Somehow the only

option available right now (considering the recommendations to keep the brand/model etc. exactly the same) is CMZ8GX3M1A1600C10 (tested latency: 10-10-10-27).

Will both of these work together?

3. If yes for #2, then what about X.M.P.? Will they work just fine with that too?

Other potentially relevant components:
i5 3570
Asus P8H77-V LE
GB GTX 770 2Gb WF3
Corsair TX-750 750W

Thanks very much in advance.
 
Solution
Poprin
I would suggest it is more important to keep the speed and latency the same rather than the brand.

If you add that CAS10 Corsair RAM to your existing setup you will likely have to run the whole lot at CAS10. I recently was trying to get CAS8 and CAS9 DDR 1333mhz Corsair RAM working together and it was a pain in the a**
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Poprin

Poprin

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Dec 13, 2012
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I would suggest it is more important to keep the speed and latency the same rather than the brand.

If you add that CAS10 Corsair RAM to your existing setup you will likely have to run the whole lot at CAS10. I recently was trying to get CAS8 and CAS9 DDR 1333mhz Corsair RAM working together and it was a pain in the a**
 
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rlakhani11

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Aug 8, 2013
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Thanks very much for the quick response. Was already expecting an unfavorable opinion, considering 70% recommendations against any kind of RAM mixing/combinations.

But you didn't mention the difference between SPD and tested latency :). Please do share if you happen to have an insight on this.
 
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Poprin

Poprin

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Sorry missed that bit. Basically the SPD latency is the latency that the chip will default to. So if you have your RAM timings set to auto in BIOS the SPD latency is what the RAM will run at. The tested latency is the speed at which the manufacturer has tested the RAM at and is therefore giving you a certain level of guarantee that if you configure the RAM with these settings it will work. XMP profiles are a bit like a one click configuration for tested latency if you like, so a manufacturer will configure the XMP profiles for the chip based on its stability v's performance testing.
 
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rlakhani11

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That is a good and simple explanation.

Thanks a lot buddy.
 
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Tradesman1

Tradesman1

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XMP is programmed by the packaged set so it will depend on whether the BIOS can come up with a config that will work, or if you can manually set them up, where problems most often occur, is with voltgaes (DRAM and MC (memory controller) which often can be adjusted with mixed sets to stabilize them...the other is in the advanced timings, i.e. for 2 sticks might require a tRFC of 128 and with 4 sticks it may require 208
 
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rlakhani11

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Whoa Whoa Whoa mannn...you're using killer technical language there. Didn't seem english to me at all at first glance ;).

Anyways you're awesome man.
 
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Tradesman1

Tradesman1

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Sorry, simply put, theres no guarantee when mixing sets of DRAM, you can take 10 sticks right off the assmbly line and a good chance out of the 10 may only find 4 that all play well together, thats why sticks in a packaged set cost more (say for a 4 stick set, than it would for 2 two stick sets) it takes additional testing to find larger groups of sticks that will all play nice. ;) Hope that is clearer ;)
 
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rlakhani11

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It was indeed. Thank you very much for going an extra mile to clarify :).
 
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