16gb (2x8gb) for i7 4790k, 2400 vs 1600

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i6pwr

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Jul 12, 2010
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So I'm going to upgrade my 4x2gb Dominator for a 2x8gb and I'm not sure if I can use the 2400 or higher with the 4790k. I'm running the cpu at stock speed, but if I go with the 2400 RAM, will the XMP profile take care of any OC with the RAM and will the CPU still run at stock speeds or need to be OC'd with 2400 RAM?

 
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Tradesman1
The 4790K may require a slight OC with 2400, not normally, but there are some 4790Ks that have weaker MC (memory controllers) than others. If so, it's no big deal, generally a simple change to the CPU multiplier, and more often than not no voltage changes
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Tradesman1

Tradesman1

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The 4790K may require a slight OC with 2400, not normally, but there are some 4790Ks that have weaker MC (memory controllers) than others. If so, it's no big deal, generally a simple change to the CPU multiplier, and more often than not no voltage changes
 
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Tradesman1

Tradesman1

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_______________________

The CPU is rated for 1600, as mentioned most can run up through 1866-2133 and some 2400 with no OC, much beyond that 2666 and up you generally need an OC on the CPU to aid the MC (memory controller), was similar with the 4770K though more needed the OC for 2400 and many even 2133. It's the CPUs MC that is the true determining factor as to what data rates you can run, not the mobo. That went out with the socket 775 mobos ;)
 
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i6pwr

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Does it matter more to use 1.5V memory with the 4790k than a 1.65V 2400? Meaning I can find some vengeance 1.5V 2133 but going to 2400 it looks like I would need 1.65V and the higher voltage is what seems to stress the memory controller of the intel.

Can 1.65V memory be used with the 4790k?
 
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G

Guest

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There are no significant gains by going above 2400 for the 4790k;perf for dollar terms... It's the sweet-spot (in most terms) for that proc:

http://wccftech.com/haswell-works-high-speed-ram-benchmarks-show-ddr31600-mhz/

http://overclocking.guide/ddr3-ram-myths-enlightened/

As cheap as DDR3 is, there is no reason to buy DDR3 1600 for your Haswell, providing your Mobo supports the higher freqs
 
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Tradesman1

Tradesman1

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Yes and with no problems, and the extra bandwidth of the higher data rates of the DRAM are noticible...my Haswells (in sig) feel like dogs when I stick 1866/2133 DRAM in to test with. Wrote an article on DRAM performance (AMD vs Intel) about a year ago

http://www.tomshardware.com/reviews/dram-benchmark-fluctuations,4080.html

and was running 32GB sets of 2400, it felt slow moving from my other 4770K (running 2800) when I moved to the test rig and 2400
 
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You need to verify with the mobo manufacturer's RAM/Memory Support List (MSL). Some list will show the RAM voltage for the listed sticks/set, some will not... but you can look up the set on the web and see.

I would though, recommend using the MSL as a starting point for sure.

Note: The RAM in my sig is 1.65v and runs fine...
 
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I've got it running @4.6 on all cores... Runs stable and relatively cool on my system; 25*C idle average, 50*C-56*C under load @1.212v. OC'ing and it's results will vary, system to system as a note, which I'm sure you are aware. I'd upload a screen-shot from CPUID HW Monitor for you to see, but I don't see an option to allow for attachments.
■ ■ ■
 
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jdj9

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1.212v at 4.6oc? Mine runs at 1.287 at 4.4 when it auto-boosts. I haven't even oc'ed my cpu, just enabled xmp for ram (16gigz@1866).

You are really like mate!

Cheers.
 
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