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Can i use two different speeds of ddr4 ram? Currently i am using 2133mhz - 2x4gb and i have some 2666mhz 2x4gb lying about. So i was going to mix them both. Will it work? Or damage them?

It should work, the higher clock stick will run at the lower clock.

Though mixing RAM like this can be bad for stability.

 Almost as cool as my temps  

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yes they will all run at the slowest common speed

CPU: Intel i7 5820K @ 4.20 GHz | MotherboardMSI X99S SLI PLUS | RAM: Corsair LPX 16GB DDR4 @ 2666MHz | GPU: Sapphire R9 Fury (x2 CrossFire)
Storage: Samsung 950Pro 512GB // OCZ Vector150 240GB // Seagate 1TB | PSU: Seasonic 1050 Snow Silent | Case: NZXT H440 | Cooling: Nepton 240M
FireStrike // Extreme // Ultra // 8K // 16K

 

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