Mixing RAM modules

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VII07x

VII07x

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Sep 7, 2010
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Hello,

I recently bought a 2x kit of 4GB Kingston Predator ( KHX18C9T2K2/8X ) but, after a month, I decided to go for 16GB. The nice guys at my local shop told me this model as been discontinued and that they wouldn't be able to get more of this, nor would they exchange the ones I have bought. Yes, nice guys indeed. They suggested the model HX318C9T2K2/8, saying it's the same. Kingston also said the same, as another shop. But, looking at the specs, and considering I'm going to be using the XMP profile #1, they will work at diferent timings and voltages. This ISN'T recommended, is it?

http://www.kingston.com/datasheets/KHX18C9T2K2_8X.pdf (the ones I have)

http://www.kingston.com/dataSheets/HX318C9T2K2_8.pdf (they ones that are being recommended)

Thanks,
 
Solution
Shaun o
To be honest, your right in what you are thinking.

The cas and timing values are C9 for your old set.
And C11 for the new set they recommended.

The problem is the higher the speed or Xmp mode you choose the more likely you are to run into problems.

What sometimes happens is you have to find a medium in the Cas, latency settings.
to get the memory to work right without errors.
And often more than likely when trying to set the highest rated speed for the memory it can not be done.

If you want it all at the same speed, with little fuss.
Then it would be best to just buy, and start a fresh with a 16Gb memory kit providing the motherboard memory slots can take a density of 8GB memory stick per memory slot, check the motherboard memory...
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JackNaylorPE

JackNaylorPE

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Oct 30, 2004
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If they were exactly the same, you have no guarantee that they would work together ... Id sell the 2 older ones and keep the new 2 x 8GB kit....

are these both "kits" consisting of 2 sticks in the same package ?

Or is your plan 2 x 4 GB = 1 x 8GB = 16 GB ....NOT recommended
 
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Shaun o

Shaun o

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Oct 7, 2007
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To be honest, your right in what you are thinking.

The cas and timing values are C9 for your old set.
And C11 for the new set they recommended.

The problem is the higher the speed or Xmp mode you choose the more likely you are to run into problems.

What sometimes happens is you have to find a medium in the Cas, latency settings.
to get the memory to work right without errors.
And often more than likely when trying to set the highest rated speed for the memory it can not be done.

If you want it all at the same speed, with little fuss.
Then it would be best to just buy, and start a fresh with a 16Gb memory kit providing the motherboard memory slots can take a density of 8GB memory stick per memory slot, check the motherboard memory specs before hand.

And make some money back from the 4Gb you have by re selling on e-bay or something.
 
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Solution
VII07x

VII07x

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I find it wierd that Kingston themselves (techs) said it was ok... At least I had the idea RAM modules had to be exactly the same, too. I have 2x4GB, and I wanted another set of 2x4GB...
 
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Tradesman1

Tradesman1

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Jun 5, 2013
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Both appear to be 1866, 2x4GB sets one is CL9 the other is CL1. There are no guarantees when mixing DRAM (which the 'nice guys' should have told you, sounds like they are trying to clear out the stock. If the first was discontinued, the second more than likely is also (same line of DRAM different spec sticks)), even if you had gotten a second set of the same identical DRAM. They might play, they might not. If they say they will play, make sure you get it in writing that they can be returned if they don't work together with the old, or next you'll go back and they show you a set of 2x8GB that they will guaranteee to work ;)
 
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VII07x

VII07x

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Thank you for the help, everyone. Guess I'll try to sell these off, and get newer ones. It's a shame so many "techs" aren't qualified to be working with this kind of stuff, giving just plain wrong information to customers. Thanks for having my back. :)
 
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