Any negative effect using higher MHz memory than CPU supported?

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pm4

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Hello
I would like to ask partly theoretical question.

Example setup:
i7-4771, i7-4790, i7-4770k all rated for 1333 or 1600 memory
motherboard supporting 1600 mhz and 1866mhz with supported XMP (for example Z87 or Z97 Sabertooth)

Questions:
1. Can you use XMP with locked CPU?
2. If you can use XMP. Could it have any long term negative effect if you use 1866Mhz memory (1.5V) with CPU which have official support for 1600MHz (1.5V) using XMP? Short of technical void of warranty which I guess they can't prove anyway.

Can it somehow damage CPU and it's memory controller? From what I read all those new CPU can handle much higher speed even as high as 3000MHz but can it have long term negative effect?

Thank you for answer

EDIT:
3rd question can be
If there is no negative effect at 1600 to 1866MHz can something happen at higher frequency like 2400+ or 3000? Ofc with motherboard which supports it.

 
Solution
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went and looked at the 2 sabertooths at asus and there memory support list and theres 0 files on that. so I guess asus has not tested the boards yet with any memory... I guess that's left up to you .... not saying this is better but look at there memory support list its not blank as with asus

http://www.asrock.com/mb/Intel/Z97%20Extreme6/?cat=Memory

you know the z87 has been out for some time and is proven and this z97 just came out and no onen found the bugs yet [if any] and really what do you gain with the z97 as of today? future proof? by the time them parts come out and are fully supported it will be time for as new build .. and seeing that you will be using all z87 parts for now to fire up the z97 board in till its...
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junkeymonkey

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I would think it would be the same as overclocking the memory controller like this i5 I run is rated for 1600 and my amd althlon is rated for 1333 but you can use what you what with in the boards rated memory specs and it just overclocks the controller to the speeds you installed ...now weather it will be 100% stable is the chance you take on that as with any overclock..
 
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pm4

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Well not sure :). So no conclusive negative long term effect just classic "if you OC something may go wrong".

But at the end I'll go with 1600 MHz anyway because I need low profile and other LP from corsair which are available are either either outside of supported range or have bad timings so will stick with 1600 MHz CL8 LP 1.35V for what I ll need.

Btw I contacted intel support regarding void of warranty on CPU if I use memory outside of CPU supported range (1333/1600 for i7-4770k for example). Using XMP and motherboard supported speed.

Answer from intel support was:
If you are using memory which is supported by your motherboard it wouldn't void your cpu warranty. Using RAM higher speed than cpu support might downgrade the RAM speed.

What would void warranty is overclocking cpu speed above the supported speed.

When buying RAM please check with motherboard manufacturer for tested memory list. As long as you use tested parts you will not loose your warranty on the cpu.
Click to expand...

So at the end that mean. In theory if you find your memory on tested list for motherboard and you won't OC your frequency no void of warranty.
Problems are just 2 :). 1st for higher memory frequency you will probably need to OC anyway or you are OC already so no difference.
2nd To find memory you want on tested list for motherboard is really hard.

 
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junkeymonkey

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normally no but any memory can be incompatible... as for me I just stick with what the chip supports on its controller and its always been fast enough for me .. like I said I beleave this i5 haswell I run is rated for 1600, my board supports up to 2933-oc but is up to 1600 standard so anything over 1600 is called an overclock..

what board are you looking at ?? there should be plenty of memory around for it .. if not sure just e-mail the folks like at g-skill ,team, patriot or whoever and they will help you with something in there brand
 
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pm4

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Thank you for effort.
At the end I'll go with Z97 Sabertooth and as it's not oriented on gaming it support only up to 1866 and between 1600/1866 is little if no difference at performance. + it's hard to get LP 1866 with also low timings. One I found in shop I plan to use are 16GB Crucial Ballistix Tactical 1600MHz CL8 LP with 1.35V. It should be decent memory and performance except few games or few applications won't be much slower than 1866 cl 9.
Btw I need LP because I plan to use Noctua NH-D15.

If I would find 1866MHz 16GB (2x8GB) cl 9 (ideal 9-9-9-24/27 or +- like that) low profile with max 1.5V I might consider that.

So again thank you.

 
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junkeymonkey

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I don't know about that sabertooth brand myself my buddy and his son each got one [amd] and they were all junk mine lasted the longest and it was just bad all around my buddy was a asus fanboy but the sabertooth broke him of that maybe the intel one is better ?, but three boards bought at 3 different times and all used different hardware are all in the trash..
 
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Tradesman1

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On the Z97, I'd suggest the Hero unless the Sabertooth has something in particular you need, I've been running the Z87 Hero for a long time now, an just picked up the Z97 Model of it, it's even better and the Z87 version is/was the best selling and best rated Z87 enthusiast mobo
 
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junkeymonkey

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went and looked at the 2 sabertooths at asus and there memory support list and theres 0 files on that. so I guess asus has not tested the boards yet with any memory... I guess that's left up to you .... not saying this is better but look at there memory support list its not blank as with asus

http://www.asrock.com/mb/Intel/Z97%20Extreme6/?cat=Memory

you know the z87 has been out for some time and is proven and this z97 just came out and no onen found the bugs yet [if any] and really what do you gain with the z97 as of today? future proof? by the time them parts come out and are fully supported it will be time for as new build .. and seeing that you will be using all z87 parts for now to fire up the z97 board in till its supported hardware is released .. just a point to ponder

 
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Solution
Tradesman1

Tradesman1

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The Z87 support list can be found here

https://www.asus.com/Motherboards/SABERTOOTH_Z87/HelpDesk_QVL/

on the Z97s, believe they are still testing, though have a 10-12 page list of compatible DRAM in the Hero's manual, imagine they have same in the ST's manual...and am guessing the manual is fairly up to date as they list some sets of DRAM that haven't been released to the public yet, like GSkill's new 3200 Trident X set
 
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junkeymonkey

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its all good with asus I think there loosen there grip. the memory support list with nothing on it on a board that's released is kinda sad like they don't care just sell it . just my opinion but after the last asus fiascoes we went through, there not welcome here with us that was like $600 in there boards and all failed, plus different parts on each board then replacement boards witch all the parts pulled off the asus boards work stable and are still running. its hard to look asus way after that. asus cost us some bucks and that where it counts.
 
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pm4

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With so many boards asus make you probably had bad luck :(. It's unlikely to have it more times but still it happens. I can only hope it won't be my case generaly asus makes good boards and when you buy anything you must have little hope that you won't be unlucky. As exampel I bought switch from dlink, plugged it and it worked 1 hour. I returned it and get diffrerent dlink switch and that works flawlessly for over 3 years now.

To matter of Z97 Hero, I was considering it, but I'm not really big gamer. Sadly my prime gaming years are probably past :) and If I'll OC ever I won't push it too hard.
So what I look for is more stable and long term build which will last me for X years (X = as high as possible but atleast 5+). So I'm trying to find most stable and durable build I can find. I don't care to have ultra settings on everything. If it will run future games atleast at mid or even low when I'll feel like to play some games I'll be happy enough. By definition TUF series should be exactly what I look for. Ofc I know big part of it is marketing. One minor reason is also that I'm going to get Corsair C70 Vengeance Military Green which should look good with sabertooth.

That is also why I try to dig into compatibility to ensure that it will work together. My whole build is in my profile if you want to look, I plan to get it when i7-4790k is released so hopefully.

I asked noctua about compatibility of full size Crucial Ballistix Tactical with NH-D15 and Sabertooth Z97. If it will be ok I ll get 1866 CL9 if it won't I ll go with 1600 CL8 Low profile (2x8GB )

Neither of those rams is on compatibility list nor is half of rams you can get in shops.
But I guess compatibility will be similar to Z87 and that worked with similar rams.
 
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junkeymonkey

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bad luck is getting 1 board that's bad but 3 bought by 3 different people at different times [about 2 weeks apart] and delivered to different addresses ?? that's not bad luck that's just bad quality .. all items bought from newegg. I think tradesman gets a bonus from asus for promoting there items he's quick to respond as he did on there board as above...
 
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pm4

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Well I ll take my chance with that board :).
If it will break I ll return it and will know better for next time. I had so far good experience with asus products and even have asus motherboard in older PC.

But this thread changed topic from original question.

I guess so consensus would be that using higher frequency is overclocking of controler and have classic risks of OC?

With speed I have in mind right now it doesnt really matter as they are close to each other and performance wise not really different except few computation heavy applications.
 
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junkeymonkey

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its all good. you buy what you want set it up and fingers crossed it works.. lots of folks run the higher memory with good results but keep in mind theres a chance it don't . but if you stay with a memory that's got a solid reputation and as tradesman said use the xmp profile it should be fine its more like a 5/100 chance it may not go stable on a quality board of any brand ..

and good luck with the sabertooth hope it don't sink its saber teeth in to your billfold as they did ours..
 
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