I managed to Undervolt my DDR3 RAM to 1.2v stable!

[Dr. Danger]

Yep.
I am amazed, it passed Memtest 3 times if I remember correctly.
RAM Module is Kingston KVR 1333mhz 1.5v.
CPU is i7 2600k and RAM is Dual Channel 4+4(8gb).
Motherboard is Lga 1155 H61 Chipset (Gigabyte)
Power Supply - Corsair CX 450m
Btw, undervolted all Chipsets and CPU on Mobo without any stability issues too, this is INSANE!

I was able to get 0 errors at 1.140v in a 2min test, but at 1.120v it gives some errors, like 60 total in 1min and at 1.100 it gives 65000+ or whatever is the max count for Memtest in just a few seconds. Now I am wondering should I try to reach stable 1.140 or 1.160 for even lower temps, higher stability, longer lifespan of modules.

I just built this PC, switched from DDR2 to DDR3 config and it's literally night and day difference.
GPU is currently HD 5870 1GB (very limiting factor) GTA 5 flies on this machine, as long as VRAM is within a GPU's limits. Around New Year I will upgrade that too probably, to maybe GTX 750ti, GTX 950/960 or maybe GT 1030.

Anyways, GPU is not my focus here, so anyone had experience like this? Is this a really well made module or what? Maybe they just took 1600mhz modules, named them 1333, limited their speed and that would explain why it runs at such a low Voltage without any issues...

[76561198343548661]

Dr. Danger , focus on the important things . In your case is the GPU .

[Dr. Danger]

Ursprünglich geschrieben von smallcat:

Dr. Danger , focus on the important things . In your case is the GPU .

I am poor, yet lucky that my friend gifted me his old DDR3 PC and I kept only Mobo from that PC and upgraded other parts. GPU will upgrade just right before a New Year.

[His Majesty's strawberry cart]

this..is just one step closer to cold fusion, bravo! [nosebleed]

[Dr. Danger]

Ursprünglich geschrieben von Bubba Ho-Tep:

this..is just one step closer to cold fusion, bravo! [nosebleed]

[Raoul]

Undervolting has far greater gains on the CPU and GPU but for RAM it's very minimal and on sandy/ivy platforms where the datarate matters more so, going from 1333 to 2400/2666 @C9/C10 makes a very noticeable difference in the responsiveness of the system. Was running my 2600K all core 4.5ghz offset OC at ~1.225V with 2400 C9 dominator plats on a Z77 V Gene, win7 with blackbird + black viper service config it really was a perfect experience for me and had the lowest system latency of any setup I've worked on.

[Jamebonds1]

I do not recommend undervolting the RAM since it could stressed the driver that control voltage to drag more current and overheat later.

So, it is better to just keep it at 1.5 +/- 0.075 Volt RAM.

[Dr. Danger]

Ursprünglich geschrieben von Raoul:

Undervolting has far greater gains on the CPU and GPU but for RAM it's very minimal and on sandy/ivy platforms where the datarate matters more so, going from 1333 to 2400/2666 @C9/C10 makes a very noticeable difference in the responsiveness of the system. Was running my 2600K all core 4.5ghz offset OC at ~1.225V with 2400 C9 dominator plats on a Z77 V Gene, win7 with blackbird + black viper service config it really was a perfect experience for me and had the lowest system latency of any setup I've worked on.

Thank you for such a detailed response. Sadly my chipset is H61 so no Overclock option, it works at 3.5ghz and no option for RAM overclock either... I am happy with the performance, low voltages, all I need is to upgrade GPU and I have complete dream PC I always wanted... When I start feeling like it's getting really old, I will just change motherboard and push it to 4.5ghz and ram to 1600mhz, won't be anytime soon I guess... Anyways, my CPU is at 1.108v currently, undervolted at stock speed. GTA 5 is CPU demanding game for example, I play it on decent settings, except textures because of 1gb vram and it literally flies, no stuter at all, I am limited by both gpu speed and memory, CPU is not used even 50% in that game, I am very impressed, 8 threads do job very well! Feels like this CPU is ETERNAL when it comes to speed and games LOL haha...That's the main reason I undervolted literally everything, just in case that I decide to keep it for many years (I like to keep stuff, I am poor and upgrade only when I have to) My country is gifting to young people around 45 euros around New Year and I will also sell HD 5870 for 20 euros and get some decent gpu that I find at that moment at that price, wether it be GTX 750ti, GTX 950/960, GTX 1050/1050ti or gt 1030 (but low memory bandwidth, so hopefully not gt 1030)

[Jamebonds1]

Ursprünglich geschrieben von Dr. Danger:

Ursprünglich geschrieben von UberFiend:

You're saving 1/4 the power of a watch battery, congratulations.

Now when I think about it... Watch battery uses much higher voltage than CPU or GPU or RAM and yet it has such a big influence on temps... Interesting.

That is different story, but Apple watch has battery lifespan issue. They use more power due to light background. That is something only Garmin watch solved issue by no light background need. Sun or house light is all need to see time.

[Dr. Danger]

Ursprünglich geschrieben von Jamebonds1:

I do not recommend undervolting the RAM since it could stressed the driver that control voltage to drag more current and overheat later.

So, it is better to just keep it at 1.5 +/- 0.075 Volt RAM.

huh? There are even some ddr3L RAM modules at 1.35v for reduced voltage/less heat... DDR4 has 1.2v default... Why would 1.2v be bad for ddr3 RAM module at only 1333mhz speed? It's pretty obvious that it doesn't need more voltage and I even didn't went all the way down, it can handle like 1.140/1.160v...

[Jamebonds1]

Ursprünglich geschrieben von Dr. Danger:

Ursprünglich geschrieben von Jamebonds1:

I do not recommend undervolting the RAM since it could stressed the driver that control voltage to drag more current and overheat later.

So, it is better to just keep it at 1.5 +/- 0.075 Volt RAM.

huh? There are even some ddr3L RAM modules at 1.35v for reduced voltage/less heat... DDR4 has 1.2v default... Why would 1.2v be bad for ddr3 RAM module at only 1333mhz speed? It's pretty obvious that it doesn't need more voltage and I even didn't went all the way down, it can handle like 1.140/1.160v...

DDR3L and DDR3 are different RAM. It is undervolt that shouldn't be used at all. As I said, undervolt could stressed the driver that control voltage, because it may drag more current and overheat just to keep up with undervolt.

[Dr. Danger]

Ursprünglich geschrieben von Jamebonds1:

Ursprünglich geschrieben von Dr. Danger:

huh? There are even some ddr3L RAM modules at 1.35v for reduced voltage/less heat... DDR4 has 1.2v default... Why would 1.2v be bad for ddr3 RAM module at only 1333mhz speed? It's pretty obvious that it doesn't need more voltage and I even didn't went all the way down, it can handle like 1.140/1.160v...

DDR3L and DDR3 are different RAM. It is undervolt that shouldn't be used at all. As I said, undervolt could stressed the driver that control voltage, because it may drag more current and overheat just to keep up with undervolt.

Idk what you mean by drivers, any other word for that? Also by overheat, are you talking about RAM overheat or something like VRM's overheat or Memory Controller?

[Jamebonds1]

Ursprünglich geschrieben von Dr. Danger:

Ursprünglich geschrieben von Jamebonds1:

DDR3L and DDR3 are different RAM. It is undervolt that shouldn't be used at all. As I said, undervolt could stressed the driver that control voltage, because it may drag more current and overheat just to keep up with undervolt.

Idk what you mean by drivers, any other word for that? Also by overheat, are you talking about RAM overheat or something like VRM's overheat or Memory Controller?

Driver is an IC (integrated circuit) that act as a power supply on mobo, but it is voltage regulator with switching mode.

[Dr. Danger]

Ursprünglich geschrieben von Jamebonds1:

Ursprünglich geschrieben von Dr. Danger:

Idk what you mean by drivers, any other word for that? Also by overheat, are you talking about RAM overheat or something like VRM's overheat or Memory Controller?

Driver is an IC (integrated circuit) that act as a power supply on mobo, but it is voltage regulator with switching mode.

So it filters excessive Voltage and by me undervolting ram to 1.2v it has to filter more and therefore it gets stressed? Is that IC universal to all components? I remember undervolting even PCH and every Chip on Motherboard, also when I google, mostly Undervolt seems to be desirable and a good thing, do you have anything that explains this in more detail? Are you 100% sure that it's overheating it or it's just potentially overheating?

[Jamebonds1]

Ursprünglich geschrieben von Dr. Danger:

Ursprünglich geschrieben von Jamebonds1:

Driver is an IC (integrated circuit) that act as a power supply on mobo, but it is voltage regulator with switching mode.

So it filters excessive Voltage and by me undervolting ram to 1.2v it has to filter more and therefore it gets stressed? Is that IC universal to all components? I remember undervolting even PCH and every Chip on Motherboard, also when I google, mostly Undervolt seems to be desirable and a good thing, do you have anything that explains this in more detail? Are you 100% sure that it's overheating it or it's just potentially overheating?

No. I just said "could" and "may", so potentially overheating.

[Dr. Danger]

Ursprünglich geschrieben von Jamebonds1:

Ursprünglich geschrieben von Dr. Danger:

So it filters excessive Voltage and by me undervolting ram to 1.2v it has to filter more and therefore it gets stressed? Is that IC universal to all components? I remember undervolting even PCH and every Chip on Motherboard, also when I google, mostly Undervolt seems to be desirable and a good thing, do you have anything that explains this in more detail? Are you 100% sure that it's overheating it or it's just potentially overheating?

No. I just said "could" and "may", so potentially overheating.

Alright, is there a way for me to check that by touching some part of Mobo? Where is that located? I mean, if that's VRM (square black chips) then I know where to check temps I guess...