Is it safe to use Memory Ram speed higher than what the CPU supports?

1800Toaster

Commendable
Feb 25, 2016
3
0
1,510
I just bought a single stick 1x8gb DDR3 ram 1866 Mhz to upgrade from old Corsair XMS3 DDR3 1333Mhz 2x2gb (4gb) recently (it's the only thing in stock, since it's very hard to get lower speed DDR3 rams in Malaysia especially price hike in 2016). My pc specs are:

Windows 8.1
Intel Core i5 2500K 3.3Ghz (stock)
AsRock P67 Extreme4 (http://www.asrock.com/mb/Intel/P67%20Extreme4/)
1x8Gb Kingston HyperX Fury 1866Mhz DDR3
EVGA GTX 970 4GB
Corsair ForceGT SSD 250GB
ThermalTake Toughpower XT 675W
1080p DVI Samsung Monitor

So my question is, since Intel i5 2500K only supports up to 1333Mhz ram speed (my motherboard supports the 1866Mhz), is it safe to leave the RAM running at 1866Mhz on Auto?

By default after I installed the ram, it's stated in bios and cpu-z, it's running at 1866Mhz speed. I change the bios profile set from default auto to DDR3 - 1333Mhz profile (HyperX Fury doesn't have xmp profile so it sets the default 1333Mhz PnP profile instead from the stick) just to be safe since I prefer stability over overclocking the system. Just wanted to ask whether it's safe for it to run than the supposed cpu support. Thanks!
 
Solution
1333 is nothing more than the suggested base level for DDR3 and the CPU - meaning it should run with any DDR3 1333 that the mobo supports. A 2500K can generally run up to 2133 and on occasion 2400 DRAM, though a CPU OC may be required. With no OC prob 1600 or 1866

Tradesman1

Legenda in Aeternum
1333 is nothing more than the suggested base level for DDR3 and the CPU - meaning it should run with any DDR3 1333 that the mobo supports. A 2500K can generally run up to 2133 and on occasion 2400 DRAM, though a CPU OC may be required. With no OC prob 1600 or 1866
 
Solution