Ram frequencies and motherboards compatibility question

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muhammadsaleet

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in many motherboards,in its memory standard specs there is support for higher overclocked frequencies (2166 OC, 2666 Oc etc...) and then there is 1600/1333. does this mean that it does not support 2133 unless its an overcloaked frequency? if so what frequency will you get from say 2600Mhz ram component?
 
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muhammadsaleet

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for example these are the memory specs for asus z87-a:

3000(O.C.)/2933(O.C.)/2800(O.C.)/2666(O.C.)/2600(O.C.)/2500(O.C.)/2400(O.C.)/2200(O.C.)/2133(O.C.)/2000(O.C.)/1866(O.C.)/1800(O.C.)/1600/1333 MHz Non-ECC, Un-buffered Memory

this means that the motherboard supports overclocking the 1600 & 1866 rams to the stated frequencies.
if the ram is 2600Mhz (without OC) it will run @ 2600Mhz normally with no problems. is this correct?
 
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muhammadsaleet

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so if they're rated to 2600 they're operate @2600 without any tweaking of any kind just plug them right?
thank you for your help! i really know little about computer components and trying to learn so i can build my own pc.
 
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Tradesman1

Tradesman1

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No, No, no - ANY mobo when you install DRAM will initially load the DRAM at the mobos default - normally 1333/1600 (some still 1066), from there you have to set the DRAM up - on Intel rigs with for 1600 and at times 1866/2133 it's generally no more than enabling XMP and selecting profile 1. If the sticks are 1866 or higher it may well require an OC of the CPU, and since you mention 2600, generally 2400 and up DOES require an OC of the CPU.....SO in brief with any CPU for 1600 and up Yes - you need to go into BIOS and change a couple things (enable XMP and sselect profile 1) for roughly 1866 and above you still need to do the XMP thing, but also may need to put an OC on your CPU
 
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muhammadsaleet

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doesn't that depend on the cpu itself? if I'm using an i7 4770k and 2400 DRAM do I still need to overclock the cpu to load the RAM at 2400?
should I just get the 2400, let them load at 1600? or get the 1600 RAM? what about the latency thing?
 
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i7Baby

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Old cpu's had their operating voltage tied to the ram voltage. That's when you had to raise the voltage and clocks of both.

Now they are separate.

My LGA2011 PC, I just set XMP and got 2133 per the ram rated speed. My cpu is still nice and quiet and cool.
 
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Tradesman1

Tradesman1

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You had asked if any tweaking needs to be done...was pointing out when you first install the DRAM be it 1866, 2133, 2400 or whatever, initially it will default to the mobos default - it doesn't just pop in and run at the specified/advertised freq, you have to go in and set it to the freq (tweaking if you will), with many, it's no more than enabling XMP and selecting profile 1...though depending on the individual CPU, it may still take a slight OC of the CPU or voltage adjustments - not all CPUs in a given model are 'equal'

http://www.hardocp.com/article/2013/06/01/intel_haswell_i74770k_ipc_overclocking_review/6#.U5oTz_ldU-L

i.e. I currently have two 4770K rigs, and with one using 2400 sticks they run fine simply with XMP enabled, the other is a little weaker and required a slight OC to run 2400 under XMP
 
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