Mix memory speeds/timings?

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Ryan_250

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Jan 1, 2017
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I have PNY 16gb ddr3 1600 ram with 9-9-9-24 timing installed in my PC right now.
I have Gskill 8gb ddr3 1866 ram with 8-9-9-24 timing.
Will the CAS latency slight difference affect it greatly ontop of it having a different speed?
Can I install that to my pc without compatibility problems or should I just avoid that?
Thanks
 
Solution
Shaun o
As said the 1866Mhz Gskill matched memory kit will no doubt default to 1600 Mhz
Your in luck because the latency timing values between both speeds of the mixed memory kits are near as close as you can get without causing too much of a problem when running the kits together.

All the same if the speed values are quoted as the Xmp values or Xmp profile stored on the memory sticks.
Then you need to check that the voltages using that setting are the same for each kit of memory also.

You may have to resort to manually setting the speed to 1600 Mhz, making sure the memory timing values are also set in the bios of the motherboard and the memory configuration settings of it to the 9-9-9-24 setting.

And a T2 memory state. of 7.8Ms.

And the...
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Ryan_250

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Jan 1, 2017
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Yeah I just wanted to get my ram up to 24 rather than buy some more.
and with the CAS latency barely different I'm just unsure

I currently have...
Asus 970 pro gaming/aura
AMD FX 6350 3.5Ghz
PNY 16GB ddr3 1600 ram
GTX 760 SLI
850w Corsair PSU
 
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Shaun o

Shaun o

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Oct 7, 2007
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As said the 1866Mhz Gskill matched memory kit will no doubt default to 1600 Mhz
Your in luck because the latency timing values between both speeds of the mixed memory kits are near as close as you can get without causing too much of a problem when running the kits together.

All the same if the speed values are quoted as the Xmp values or Xmp profile stored on the memory sticks.
Then you need to check that the voltages using that setting are the same for each kit of memory also.

You may have to resort to manually setting the speed to 1600 Mhz, making sure the memory timing values are also set in the bios of the motherboard and the memory configuration settings of it to the 9-9-9-24 setting.

And a T2 memory state. of 7.8Ms.

And the highest memory voltage setting stated out of the two memory kits if they differ.

1.5v or 1.55v

 
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Solution
Lutfij

Lutfij

Titan
Moderator
Oct 7, 2009
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Think of rams as a pair of shoes, if you loose one out of a pair you end up buying a pair at the store and not just the one you lost. With rams, it's more about trying to have more than one stick of ram to operate optimally. If you buy a kit, they are binned more strictly as opposed to a single stick of ram is binned. Due to the stricter regulations of binning for a kit, the cost of such kits end up being higher.

The added cost is worth it since you end up with a reliable set of rams on your system. With adding, mixing and then trying to match ram sticks although they may downclock and then may have similar timings, you're just trying to make them do what they shouldn't be doing.

Get rid of all the rams and try to populate the slots evenly with a kit of, say, 4x4GB or 4x8GB 1866MHz or 2133MHz rams. The latter figure will only be attainable by an overclock which leads me to ask, what your CPU cooler is? At 125W TDP, you're going to need some beefy cooling.
 
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Ryan_250

Commendable
Jan 1, 2017
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Yeah I might just be safe and stick with 16gb because its still plenty for now. I'm indecisive. Save it for another PC maybe haha. I just replaced my stock cooler a week ago with the Enermax ETS‑T50A‑WVS cooler. Went from 65c to 40 under full load.
 
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