Will the new RAM work with the old one?

[Peter Koppa]

Hello,

I have currently 8 GB of ram. I have two of these 4 GB modules installed at the moment:
http://www.kingston.com/datasheets/khx1600c9d3b1k2_4gx.pdf

They currently run at 1333Mhz on default (the motherboard set it this way) in dual channel. I want to buy additional 8 GB of ram, and I'm planning to buy this kit, it seems to be matching the parameters of my ram:
http://www.kingston.com/dataSheets/HX313C9FK2_8.pdf

or

http://www.kingston.com/dataSheets/HX316C10FK2_8.pdf

The second one matches the timing settings with my RAM in 1333Mhz, 9-9-9-24 are the current timings for my rams.

The question is will any of them run together with my old rams, or if none of them would do, what kind of ram should I buy next to these?

 

[mcnumpty23]

mixing ram is a lottery it will either work or it wont

thats why ram is sold in kits

i have mixed it and it worked and other times it wouldnt work

 

[Peter Koppa]

https://www.kingston.com/datasheets/KHX1600C9D3B1_4G.pdf

I linked a wrong one. This is what I have in my computer. 2 of them to be exact.

 

[mcnumpty23]

https://www.kingston.com/datasheets/KHX1600C9D3B1_4G.pdf

I linked a wrong one. This is what I have in my computer. 2 of them to be exact.

the answers still the same adding ram is hit and miss

even getting identical modules isnt 100% guaranteed to work

though gives a better chance

 

[Peter Koppa]

They didn't work together, but I set their frequency and timings and voltage to a common setting where they all work.

Now they are running on 1,6V 1600Mhz 9-9-9-24 timing setting. Is it fine to run a ram on 1,6V on the long run, or should I decrease it back to 1,5V and use 11-11-11-28 timing instead? Or isn't that 0,1V harmful?

As far as I'm well-informed rams are recommended to run between somewhat 1,415 - 1,575 V, but I'm not sure though. So taking that it's 0,025V overvoltage.

 

[Peter Koppa]

And another question, what does the command rate mean? It was 1T before, now it's set to 2T.

 

[mcnumpty23]

And another question, what does the command rate mean? It was 1T before, now it's set to 2T.

1T is faster than 2T but may cause blue screen if it doesnt like it

i remember older ram using 1.65v but not sure which motherboard i was using then

might have been some of the first i7 cpus but not totally sure to be honest

i would think 1.6v should be ok i certainly remember overclocking my ram years ago and did add a bit of voltage to do it

but again not 100% on it guess i am having a bad memory day today lol

though if you relaxed the timings and went to 1.5v i doubt you would notice the difference

unless you ran a ram benchmark test

in real life use if i drop my ram from 3,000mhz to 2400mhz i just cant tell any difference