i7-4790K + Asus Z97-A, how to choose ram?

ccjmk

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Hi, I've been trying to read and get informed about how exactly does ram works but I just get into more and more open doors, so I'll better ask this for good.

I'm definitely settled on buying an Intel i7-4790K processor, with an Asus Z97-A or Z97-C motherboard (feel free to comment on the mobo),
I've already got an XFX R9 280x graphics card.

But I can't define on RAM. I read on Intel's specs site that the memory specifications for i7-4790K is using DDR3-1333/1600 ram. Also, I read several times that 4790K supports 1.5v memory output (I'm not fully aware of the cause of this restriction, but it's usually followed by a "you can still use higher-voltage ram, with care" clause)

As an example, Asus Z97-A claims it supports all these memory modes:

3200(O.C.)/3100(O.C.)/3000(O.C.)/2933(O.C.)/2800(O.C.)/2666(O.C.)/2500(O.C.)/2400(O.C.)/2200(O.C.)/2133(O.C.)/2000(O.C.)/1866(O.C.)/1600/1333 MHz Non-ECC, Un-buffered Memory


So, if I buy ram modules that run at higher than 1600MHz, will I have any issues? should I somehow adjust the settings on the BIOS to make them work at full speed? will those have any implications on the RAM's or CPU's lifetime ?

Same with voltage, can I use a ram with more than 1.5v ? needs adjustments on BIOS or else? harms CPU/mobo ram to do so ?



As for putting names to the example, I've been looking at these RAMs:

Corsair Vengance 8GB: (all within margins, lowest timings)
-DDR3 1600 (PC3 12800)
-9-9-9-24
-1.5V

Corsair Vengeance LP 8GB: (higher frequency, on-margin voltage, high timings)
-DDR3 2133
-11-11-11-27
-1.5V

G.SKILL Ripjaws X 8GB: (slightly higher frequency, low timings, on-margin voltage)
-DDR3 1866 (PC3 14900)
-9-10-9-28
-1.5V

G.SKILL Trident X 8GB: (higher frequency, higher voltage)
-DDR3 2400 (PC3 19200)
-10-12-12-31
-1.65V


Thanks a lot for any info provided!
 

ccjmk

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Sorry guys but even though recommendations are nice and I appreciate them a lot, you didn't answer my main question.. that might be my fault for hidding it on a wall of text ahahh so here goes again:

-Will higher frequency ram than 1600 be bottlenecked by my CPU ?
-Can I make it work at it's factory top-speed? Does that harm any component on my PC?
-Can I run memory with higher than 1.5v voltage? does that harm any component in my PC also?
 

ccjmk

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that works for me! thanks a lot

I'd be still interesting in hearing more about that last "1.5v is recommended" though. If I can run higher-voltage ram with no harm to my other components, why should I restrict it ? heat output? power comsumption skyrocketing ?
 
Intel only officially supports 1.5v RAM as the memory controller is not designed for anything more. It voids the CPU warranty to use any higher voltage RAM but there is no way to prove that you used it, and it is very unlikely for any problems to result from using 1.65v RAM.

BUT if it is between 2400 1.65v RAM or 1866 1.5v RAM, just get the 1866. There will be no real difference anyway. You cannot even see the difference between RAM speeds at all.