g skill trident-x 2400mhz and i7 4790k undervolting to 1.5v

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Michael Thorpe

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Sep 3, 2014
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Hi guys,
I have 8gb (2x4gb) 2400mhz G Skill trident-X that I want to use in my new system.
problem is its 1.65v ram and intel only recommend 1.5V

If I were to underclock the ram to 1.5V what speed could I get and could I make the timings tighter?

FYI: I've never played with ram speeds etc so no idea about setting the timings.
 
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Tradesman1
Prob 1866/9 but there's no need 1.65 is perfectly safe, Intel certifies many 1.65 sets and 1.6-1.65 is the norm for 2133 and above, have been running those going back to Sandy bridge (some of my rigs in sig, all 1.65 sets)
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LukaBoki

LukaBoki

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Jul 12, 2014
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You do not need 2400 MHz RAM. 1866 CL9 RAM is the sweet spot for gaming
G.Skill Sniper 1866 MHz CL9 is a perfect choice.
However,if you do already own the Trident-X,then install it in your system.
When you boot your PC,go into your BIOS. Find the RAM voltage somewhere :)P).If it says 1.65V,then reduce it to 1.5V.
If it already says 1.5V,then you don't have to do anything.The motherboard has done it's job.
 
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LukaBoki

LukaBoki

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Jul 12, 2014
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I don't really know,since I've never done it and I think there's no way of telling you that than actually reduce the voltage.
Don't worry about the speeds.I can tell you that 1333 MHz isn't much different than 2400 MHz RAM.So don't worry bout that.
The Latency it the key factor.The lower the CL,the faster your RAM does what you tell it to do.
CL9 is the best option,but CL10 isn't bad too.I believe that that stays the way it is even if you undervolt it. :)
 
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wyliec2

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Apr 4, 2014
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FWIW - I use Trident 2400 with i7 4770k and Gigabyte ga-z87x-udh4 - I set XMP to Profile 2 and clock to 24 (on Memory setting tab voltage shows as 1.65v greyed out) However, on the DRAM voltage tab I set it to 1.58v. I always run stress testing that includes RAM and never get any failures. Mobo monitor reports memory running at 2400 MHz. HWInfo or Aida64 reports DRAM voltage as 1.57 or 1.572. I don't know if this is unusual or not - but it's within the 1.5v +/- 5% Intel recommendation while fully utilizing the RAM bandwidth....
 
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Meceka

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Sep 11, 2014
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Hello gskill support. When I enable xmp, because of 1.65V Memory voltage heat increases absurdly high. In stock cooler it was 100 degrees max. when fan was definitely applied well. Disabling XMP, temperature was about 75 degrees max. This cpu is definitely not for use with 1.65V memories.

Then I bought a new cooler, when xmp was enabled, it was still close to 90 degrees as I remember. I've disabled XMP, timings at default settings, reduced frequency to 2200 from 2400, voltage from 1.65 to 1.5 and now max temp. is 70 degrees.

I've just applied new cooler yesterday, and didn't test prime-95 much, but I am a game developer and my game engine (Unity) crashed a few times while testing. I can't guarantee it's something about hardware but it might be. I will post here when it's more clear.

Note: I am on a z97-a motherboard.
 
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Meceka

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They are C;

I've tested a lot, reapplied cooling fan with new paste (pee method) And I did all kind of this things before I am not a newbie.

How I definitely know that it's not about fan and about ram; When XMP is disabled, ram frequency reduces to 1333mhz. I tested prime95 about 10 minutes or so, and cpu was running in 4.2-4.4ghz, it was about 80-85 degrees, never higher.

BUT whenever I enable XMP, it hits 100 cantigrate degrees in about 2 seconds and I panically stop stress test. (I've checked how it doesn't exceed 100 degrees, and it automatically underclocks CPU to about 400-600mhz to prevent damage.) This tests are with stock fan. And if it wasn't applied well it couldn't work 80-85 with xmp disabled too. When xmp is enabled it gives memories 1.65 V and i think it's the issue.

Now I have cooler (212 evo) it was still heating badly (not 100 but as I remember it was about 90's), and I manually set ram timings and frequency (I mentioned it in earlier post) now it's fine with 2200 and default timings at 1.5V.

I found many other people having same issue with 4790k. Just search "4790k overheating 100" on google and you will see all of them have 1.65V memories.

A question, would this ram run fine with 2200mhz 1.5V default timings? I am meaning stability (no bsod or app crashes), if it will reduce stability, I am going to RMA this and get 2133 mhz stock 1.5v memories.
 
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gskill support

gskill support

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80-85 degrees is at limits already, so if you put even more stress on the CPU like high speed RAM it's bound to get even hotter. For overclocking, you should always anticipate to use a good aftermarket CPU cooler. Intel factory CPU cooler is not designed for anything other than original speed.

Yes, the memory is rated for DDR3-2400, so you can set it to anything lower than DDR3-2400 and be OK.

DDR3-2133 10-11-11-31 1.550V-1.60V

You can set it to 1.50V, then see what the lowest timings it can achieve. That's how you find maximum performance at 1.50V.

Let us know how it goes!
 
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Evan Bussey

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Apr 18, 2014
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Evan Bussey

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Big agree here!. I just bought my 4790k and almost returned it because the first thing I did was enable the Xmp on the MP to get my 2400mhz Team ram. I started with the stock cooler and was hitting 100c FAST!. Then I got a good AM cooler and the best review thermal paste online mx-4 and spent hours watching how to apply it perfectly. I did everything perfect with my 11 fans in my big case and STILL 100C on all benchmarks. I finally tried turning off the ram OC and set my Ram to 1333 with 7-7-721 timings and OMG WOW! I can't get this thing to go higher than 68c running prime 95 all day and idle in the high 20-30s now. I even found out I have a luckly over clocking chip. I can get it to 4.6 on 1.1v and that is INSANE! I was hating the 4790k so bad and ready to RMA it all for the stupid ram. Never clock your ram past 1.5 or your screwed.
 
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