Enabling xmp profile on i7 4770 non k

real ace

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Hi everyone i am going to build a new pc soon and was doing a lot of research to pick the right components.I am planning to get an i7 4770 non k cpu along with a z87 motherboard preferrably.Now my question is that z87 boards support memory rated upto 3000mhz so can i run memory rated at 1866mhz or above on this cpu with xmp profile enabled in the bios or is cpu overclocking mandatory to run higher clocked memory in which case i will just get 1600mhz memory.I have got confused after reading an anandtech article which states that
http://www.anandtech.com/show/7364/memory-scaling-on-haswell
"Avoid DDR3-1333 (and DDR3-1600)

While memory speed did not necessarily affect our single GPU gaming results, for real-world or IGP use, memory speed above these sinks can afford a tangible (5%+) difference in throughput. Based on current pricing, after the Hynix fire, it may be worthwhile, as memory kits above DDR3-1600 are now around the same price."
Also i have seen that h87 boards only support memory upto 1600mhz but they also support xmp profile ,what's the use of enabling xmp profile on h87 boards if they can't run higher clocked ram .
I have been thinking about this a lot so i hope that this thing gets cleared.
 
Solution
Not all 4770s (non-K) will hit 2133 straight up under XMP, some require a boost to the MC (memory controller) voltage or the DRAM voltage,,, 2133 however is about the top without a K model CPU....haven't seen a 4770 yet that can't run 1866 at just straight XMP settings
intel default speed for there new chips is 1600 for the memory controller built into the cpu. with ram 1333 runs at 667 on the mb bus. 1600 speed is 800. 1866 is 933. so in real life 1866 ram runs 133mgz faster then the 1600. 2000 speed ram would be 200. you have to look at the cost of the stick vs speed. some ram now on new egg in the 1866 in lp is on sale and is the same price as 1600 ram. so your getting a small speed boost and no extra cost. other web sites have taken a 3000 speed chip and showed that over 2100 speed ram your paying more for the ram then your getting back in speed.
 

real ace

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There is definitely an increase in speed with higher clocked ram at same latency but my question hangs whether there is a relation b/w xmp rams rated above 1600mhz and locked cpus.Will the ram run at the advertised speed of 1866 or 2133 mhz by enabling xmp in the bios with an i7 4770 non k cpu at stock speeds or is this xmp thing unrelated with the cpu ,you just have to enable it to run the memory at advertised speed??
 
with newer intel cpu the cpu and ram can run at separate speeds. xmp is to read the eprom on the ram and set the ram speed and cpu speed in the bios. if you dont turn on xmp profile some mb boot..turn off boot turn off till the mb can set the ram to cpu timing.
 

Tradesman1

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Not all 4770s (non-K) will hit 2133 straight up under XMP, some require a boost to the MC (memory controller) voltage or the DRAM voltage,,, 2133 however is about the top without a K model CPU....haven't seen a 4770 yet that can't run 1866 at just straight XMP settings
 
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real ace

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So that means that the cpu needs to be overclocked as the memory controller is in the cpu itself ????
Also can all i7 4770k hit speeds above 2133 not that i require that much and also what about the rest of the locked cpus including i5 4670 what ram speeds do they hit
 

real ace

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I was wondering what's the use of xmp on h87 boards and how is the cpu affected when running ram rated above 1600 mhz ,does an overclocked cpu remove bottlenecks on the ram speed???
How much high rated memory can other locked cpus take like the i5 4670??
 

real ace

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Okay so on overclocking the ram gets the required additional voltage.So should i go with 8bg(2x4) 1600mhz 9-9-9-24 latency ram or should i go for 8bg(2x4)1866mhz ram with 9-10-9-27 latency.When buying ram i look at the speed and cl only ,i go for the lowest cl and don't think much about the rest of the 3 numbers .Should i look at the rest of the numbers too when buying ram??
 

real ace

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That's great guess i will go for the 1866mhz ram .Also i heard from somewhere that running memory rated higher than stock memory supported voids the cpu warranty.Is that really the case ???
 

real ace

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Okay so it seems that whenever the case of replacing the cpu within the warranty period arises they will look at it accordingly.
 

real ace

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Okay so they probably can't know :) that but can they find out that the cpu had been overclocked or not???
 

real ace

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Also i don't think there is any use of going with an h87 board with a 1866mhz ram since it won't run higher than 1600mhz right??
I also wanted to know that if i get 8gb(2x4) 1600/1866mhz ram and run it in dual channel mode can i later get something like another 8gb(2x4) 2133mhz and also run it in dual channel ,total of 16gb with 2 pairs in dual channel at different speeds also either can i put 16gb(2x8) any speed ram and run it in dual channel taking the total to 24gb.Basically i want to know that can i run 2 sticks of same frequency in dual mode along with another pair of sticks at different speeds in dual channel mode.