Intel 4790K and Mushkin RAM Voltages

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YroPro

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Hello everyone,
I was looking for a good set of 16GB (8GBx2) RAM on Newegg, and Mushkin seemed consistently fastest for the price. I couldn't figure out why until I noticed the voltage, all of them being over 1.5, usually 1.6x. (at least in the 2100mhz+ range) The Intel 4790K is listed as only being compatible with 1.5v RAM on https://pcpartpicker.com.

Would I damage my CPU using 1.65v Mushkin RAM? I see lots of people talking about overclocking their RAM but I haven't really seen any voltages.

Thanks!
 
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YroPro

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YroPro

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Yea, there's not too many under that at those speeds, but there were some. That's why I was wondering if it was safe.
 
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YroPro

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Why wouldn't you buy Mushkin? I'm getting their Scorpion Deluxe PCIe SSD soon, they seem like they have a good handle on flash memory.
I'm getting 32GB of RAM, ~8 to use and ~24 for RAMDisk, so if I'm going to shell out this much I want something good.
 
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YroPro

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Okay just making certain because I'm putting a lot of money into this build and I'd like everything to work.
This is the message I get-
"Compatibility Notes
The Mushkin Blackline 16GB (2 x 8GB) DDR3-2400 Memory operating voltage of 1.65V exceeds the Intel Haswell Refresh CPU recommended maximum of 1.5V+5% (1.575V). This memory module may run at a reduced clock rate to meet the 1.5V voltage recommendation, or may require running at a voltage greater than the Intel recommended maximum."
 
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DubbleClick

DubbleClick

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I'm personally running a 16gb kit of 2400 mhz cl 10 g.skill ares kit with my i7 4790k. 72C is also recommended as max package temperature, going into 80's won't hurt your cpu either, though. If you are still worried, you might of course too run your 2400mhz kit with 1.65v on 1866mhz with 1.5v.
 
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Y0GI

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Why are you shopping for high speed RAM at such high voltages? 1600 MHz is the sweet spot for Haswell RAM and higher speeds do not show significant performance increases. Higher RAM voltage puts additional stress on the IMC (Integrated Memory Controller) on the CPU and makes it harder to OC a Haswell CPU.

Here is what I'm using and it works very well: Crucial Ballistix Tactical 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Low Profile Desktop Memory
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148656

Yogi
 
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YroPro

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It's going to be on a 360mm all copper radiator by itself, I don't think I'll have any temp problems. What voltage is your ram? And how much? That's some pretty good specs, but I'm already spending +3k on this so I'm getting leery on prices. I'm getting 32gb of ram for a RAMDisk.
 
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YroPro

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I'll be using the ram for ~24-26GB RAMDisk.
 
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Y0GI

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Understood. Still, a RAMDISK will not be needing speeds over 1600 MHz.

Yogi

 
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YroPro

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I understand that ram has little to no effect on gaming, but as I understand it RAMDisk speeds have a direct correlation with the throughput of the RAM, which is a product of the timing and the frequency right?
(This is my first time ever using one, but this is just how I understand it from what I've researched, I could be totally wrong for all I know)
 
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Y0GI

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Jul 22, 2013
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I understand that ram has little to no effect on gaming, but as I understand it RAMDisk speeds have a direct correlation with the throughput of the RAM, which is a product of the timing and the frequency right?
(This is my first time ever using one, but this is just how I understand it from what I've researched, I could be totally wrong for all I know)
Click to expand...

Yes, but we're talking about tiny, minute fractions of a second differences. Not something that you'd be able to notice in normal use.

Yogi
 
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DubbleClick

DubbleClick

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Memory scaling on haswell is actually quite good. You way want to have a read of the article "haswell - 1600mhz is not enough".

My memory is officially running at 1.65v (I dropped it down to 1.645v, as 1.65v in Bios would result in 1.656v readings).
It's 16 gb - 2x 8gb of 2400mhz cl10 in dual channel. No issues whatsoever, and if there were, they'd be related to the motherboard.
I personally chose the ares kits because of their low height (low profile ram) so it fits under my cooler, while being good in performance as well. It can also run in quad channel so you'd be fine with 4x 8gb.
 
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YroPro

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Your RAM sounds amazing, link to where you got it? How much? What mobo did you go? I'm probably going with the Hero VII. Formula is too expensive.
 
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DubbleClick

DubbleClick

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Got it from a german kind of microcenter, although those are rather hard to find. There were just a few cl10 rated kits I found, most are cl11. Other than that, the ares line also has 2133mhz cl9 kits, usually good overclockers. You can find a collection of some reviews at http://www.gskill.com/en/review/cat/desktop-memory/ares or just browse google. I don't know of other low profile memory with such speeds or timings.

If height is not an issue for you and you want even faster ram (and are willing to pay extra for them, usually wouldn't recommend) you can take a look at G.Skill TridentX 2400 cl9 kits. They are 220€ for a 16gb kit instead of the 160€ I paid for ares cl10.

If you want low profile ram, I'd recommend you getting a 2133 cl9 memory kit. If ram height is not an issue, you can also go with 2400 cl10. Or, for a bit more money cl9.

As for the motherboard, I went with the Gigabyte Z97x-SLI. It's not a high performance mainboard and does not reach the Maximum Hero VII, but I found it to be what I've been looking for. Fine CPU overclocking performance (4.8ghz went on mine, couldn't cool that and clocked down again, though), good memory speed, M.2 and Sata Express Slot, aswell as more than enough USB 3 and the ability to run two GPU's with both pci 8x instead of one lowered to 4x, all at the great price of 100€. Only downside to the board are the relatively low 4 phase vrm (which will lead to problems overclocking in high regions, I'm sure 4.8ghz is about the maximum it could do) and the somewhat strange RAM voltage behavior, as I said above. But as I'm personally not overclocking that high (I didn't expect to "win" the chip lottery) it was and is the right choice for me. I would not want to pay 60€ extra for 100mhz more.

Here some reviews:

Ares 2400 cl11: http://www.ocaholic.ch/modules/smartsection/item.php?itemid=1037

Ares 2133 cl9: http://www.pc-max.de/artikel/arbeitsspeicher/test-gskill-ares-ddr3-2133-cl9-16gb-ram (not sure if available in english, funny thing, the kit is reaching 2400 cl10)

Gigabyte z97x-sli: http://www.bit-tech.net/hardware/motherboards/2014/05/11/z97-motherboard-group-tests/1
 
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W1ndowl1cker

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Better late than never, and for anyone searching for more information on ram voltage overheating the 4790k: any ram voltage higher than 1.5 V will almost instantly lead to overheating your 4790K.
I ran mine with a Scythe CPU cooler and G.Skill DDR3 2133 cl9 on 1,65 V and my 4790 K, while gaming, reached 100 degrees Celcius within seconds. I lowered the voltage to 1.5 and now the temps stay below 80 degrees C.
 
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YroPro

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Well, this was unexpected. CPU's do have a memory controller so RAM voltage can effect it. But if you're getting those temps, you certainly have issues. I can hit 5Ghz and not even hit 80C. But anyways, you can use 1.65V RAM with the 4790k, I'm running 1.6V without issue.
 
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W1ndowl1cker

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Please see my answer to Dubbleclick. Even Intel say that implementing XMP (thus higher ram voltage) can cause overheating of the 4790k.
 
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