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mixing different brands of ram

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is it possible to mix different brands of  ram, if the ram sticks are both the same frequency and capacity? 

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Yes, and they'll almost always work with each other. 

CPU: Intel Core i7-950 Motherboard: Gigabyte GA-X58A-UD3R CPU Cooler: NZXT HAVIK 140 RAM: Corsair Dominator DDR3-1600 (1x2GB), Crucial DDR3-1600 (2x4GB), Crucial Ballistix Sport DDR3-1600 (1x4GB) GPU: ASUS GeForce GTX 770 DirectCU II 2GB SSD: Samsung 860 EVO 2.5" 1TB HDDs: WD Green 3.5" 1TB, WD Blue 3.5" 1TB PSU: Corsair AX860i & CableMod ModFlex Cables Case: Fractal Design Meshify C TG (White) Fans: 2x Dynamic X2 GP-12 Monitors: LG 24GL600F, Samsung S24D390 Keyboard: Logitech G710+ Mouse: Logitech G502 Proteus Spectrum Mouse Pad: Steelseries QcK Audio: Bose SoundSport In-Ear Headphones

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Yes, and they don't even have to be the same frequency, (most of the time) the faster RAM is automatically underclocked to the speed of the slower stick.

Specs: CPU: AMD Ryzen R7 3700X @4.4Ghz, GPU: Gigabyte RX 5700 XT, RAM: 32 GB (2x 8GB Trident Z Royal + 2x 8GB TForce Vulkan Z) @3000Mhz, Motherboard: ASRock B550m Steel Legend, Storage: 1x WD Black 1Tb NVMe (boot) + 1x Samsung 860 QVO 1Tb SSD (storage), Case: Thermaltake Core V21, Cooler: Noctua NH-D15

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Make sure they work at same voltage.

 

In the past, higher frequency DDR3 memory used to run at 1.65v while the standard voltage was 1.5v

Now, some high frequency DDR4 sticks run at 1.35v while some lower frequency ones run at 1.2v  - note that you can buy for example a DDR4 3000 Mhz 1.35v stick and it will most likely run at 2400 Mhz or 2667 Mhz with just 1.2v

 

BIOS will set the lower voltage and pick whatever preset is stored in the memory sticks that is supported by all sticks (most likely a JEDEC standard, 2133 or 2400 Mhz, you can afterwards tweak the timings manually if you feel like it)

 

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