[SOLVED] Does the voltage of the optimal 3900x ram kit matters?

Feb 24, 2020
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as i understand the optimal kit for the 3900x is 3600mhz, does the voltage of the kit matters for best performance? some are 1.2v & some are 1.35v, im not an overclocker so i dont want to mess with it, just to buy it ready for optimal performance.
 
Every DDR4 RAM kit will run at 1.2V@2133 MHz by default. Usually at 2133,2400,2666 the RAM modules won't need more than 1.2V. When you pass 2666 MHz(so 2800, 2933,3200,3433,3600 and so on) the modules are basically overclocked and they'll run at 1.35V.

When you're buying a 3600 MHz kit for example, initially(without enabling XMP) the kit will run at 2133 MHz@1.2V.
By enabling the XMP profile, you're basically overclocking the kit to reach the advertised frequency of 3600 MHz and it will surely run at 1.35V.

So... usually kits that have the frequency between 2133-2666 MHz are advertised as 1.2V and those with 2666+ MHz will usually run at that specified frequency by enabling a XMP profile(overclock) with 1.35V.
 
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Every DDR4 RAM kit will run at 1.2V@2133 MHz by default. Usually at 2133,2400,2666 the RAM modules won't need more than 1.2V. When you pass 2666 MHz(so 2800, 2933,3200,3433,3600 and so on) the modules are basically overclocked and they'll run at 1.35V.

When you're buying a 3600 MHz kit for example, initially(without enabling XMP) the kit will run at 2133 MHz@1.2V.
By enabling the XMP profile, you're basically overclocking the kit to reach the advertised frequency of 3600 MHz and it will surely run at 1.35V.

So... usually kits that have the frequency between 2133-2666 MHz are advertised as 1.2V and those with 2666+ MHz will usually run at that specified frequency by enabling a XMP profile(overclock) with 1.35V.
 
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Feb 24, 2020
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Every DDR4 RAM kit will run at 1.2V at default(which is 2133 MHz). Usually at 2133,2400,2666 the RAM modules won't need more than 1.2V. When you pass 2666 MHz(so 2800, 2933,3200,3433,3600 and so on) the modules are basically overclocked and they'll run at 1.35V.

When you're buying a 3600 MHz kit for example, initially(without enabling XMP) the kit will run at 2133 MHz@1.2V.
By enabling the XMP profile, you're basically overclocking the kit to reach the advertised frequency of 3600 MHz and it will surely run at 1.35V.

So... usually kits that have the frequency between 2133-2666 MHz are advertised as 1.2V and those with 2666+ MHz will usually run at that specified frequency by enabling a XMP profile(overclock) with 1.35V.
thanks, does it means i need to buy a 1.35v kit for optimal performance for the 3900x? i found a 3600 kit but it says 1.2v, so i guess its not really 3600 so it wont be the optimal one, right?
 
thanks, does it means i need to buy a 1.35v kit for optimal performance for the 3900x? i found a 3600 kit but it says 1.2v, so i guess its not really 3600 so it wont be the optimal one, right?
At 3600 MHz the kit will run at 1.35V.... any DDR4 kit won't be able to run at 3600 MHz with only 1.2V.

Maybe they're refering to the voltage needed for the kit to run at default speeds, which is 2133 MHz. As I said... when you'll enable the XMP profile the kit will run at 3600 MHz@1.35V.
 
Feb 24, 2020
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At 3600 MHz the kit will run at 1.35V.... any DDR4 kit won't be able to run at 3600 MHz with only 1.2V.

Maybe they're refering to the voltage needed for the kit to run at default speeds, which is 2133 MHz. As I said... when you'll enable the XMP profile the kit will run at 3600 MHz@1.35V.
so the stick that is 3600 1.35v out of the box isnt better somehow from the 3600 1.2v stick? its just already overclocked?
 
so the stick that is 3600 1.35v out of the box isnt better somehow from the 3600 1.2v stick? its just already overclocked?
NO... let me rephrase it for you.
There's no such thing as a 1.2V, 3600MHz kit... all 3600MHz kits are running at 1.35V. They most likely mislabeled the voltage figure.

DDR4 kits rated at 1.2V are running a frequency <=2666 MHz.
DDR4 kits rated at 1.35V are running a frequency >2666 MHz.
That's true for every DDR4 kit.


Can you give me a link to those 2 kits that you're mentioning?
 
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Feb 24, 2020
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NO... let me rephrase it for you.
There's no such thing as a 1.2V, 3600MHz kit... all 3600MHz kits are running at 1.35V. They most likely mislabeled the voltage figure.

DDR4 kits rated at 1.2V are running a frequency <=2666 MHz.
DDR4 kits rated at 1.35V are running a frequency >2666 MHz.
That's true for every DDR4 kit.


Can you give me a link to those 2 kits that you're mentioning?
the name of the kit in store is "32GB (2x16GB) DDR4 3600Mhz - CL16 - 1.2V - Trident Z RGB Series - RGB LED - Bdie"
but when i check it in the QVL " F4-3600C16D-32GTZR" it says 1.35, the same serial number, even in the gskill website the product page says 1.35.
 
the name of the kit in store is "32GB (2x16GB) DDR4 3600Mhz - CL16 - 1.2V - Trident Z RGB Series - RGB LED - Bdie"
but when i check it in the QVL " F4-3600C16D-32GTZR" it says 1.35, the same serial number, even in the gskill website the product page says 1.35.
Yeah.... I told you they mislabeled it. It's 1.35V as per GSkill official website.
 
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