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Sandy Bridge & 1.65v -- okay to see fluctuation?

post #1 of 8
Thread Starter 
Currently running my XMS3 4GB RAM at 1600MHz at 1.65v (which is the needed voltage to achieve a stable 1600MHz). Problem is, there's a bit of fluctuation going on -- 1.65v to 1.67v.

Is this fluctuation normal?
post #2 of 8
Very! I see a little bit more of a fluctuation than that, even.
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It's a computer!
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post #3 of 8
The fluctuation is perfectly fine and is nothing at all to worry about.
 
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post #4 of 8
Thread Starter 
Thanks for the responses, guys. Always quick!

If you guys don't mind my asking this, here's one thing I'd like to point out: on one of the Intel XMP Certified Lists for the 2nd gen i-series, a couple of the RAM listed were at 1.65v -- an indication that 1.65v is "safe."

Now, are they taking fluctuations into consideration (like what I'm experiencing right now, which apparently is normal), or just a flat-out 1.65v?.

I'm sure you guys are going to say the same thing, but I just want to point the above out.

Again, thanks for the responses, guys. Reps to the both of you.
post #5 of 8
Quote:
Originally Posted by alexman View Post
Thanks for the responses, guys. Always quick!

If you guys don't mind my asking this, here's one thing I'd like to point out: on one of the Intel XMP Certified Lists for the 2nd gen i-series, a couple of the RAM listed were at 1.65v -- an indication that 1.65v is "safe."

Now, are they taking fluctuations into consideration (like what I'm experiencing right now, which apparently is normal), or just a flat-out 1.65v?.

I'm sure you guys are going to say the same thing, but I just want to point the above out.

Again, thanks for the responses, guys. Reps to the both of you.
1.65V is safe, even with these fluctuations. The fluctuations are a normal operation of the memory and the motherboard.

However, using 1.65V can present some instability due to a larger separation between the VCCIO Voltage and the DRAM Voltage. That is, a separation or gap larger than 0.5V is generally not recommended. So when using 1.65V, the VCCIO can be set to 1.15 to close the gap down to exactly 0.5V.
It's a computer!
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.416-1.424V in Manual Mode) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
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250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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It's a computer!
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i5-2500K @ 4.5GHz (1.416-1.424V in Manual Mode) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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post #6 of 8
is 1.65v safe for SB...read somewhere that it would degrade the memory controller on the SB over a few months ... also read to keep it down to 1.55v ... onthe other hand, read someone went upto 1.7v on his SB rig and it didnt cause anything, still using it till date.
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post #7 of 8
Quote:
Originally Posted by mombasa View Post
is 1.65v safe for SB...read somewhere that it would degrade the memory controller on the SB over a few months ... also read to keep it down to 1.55v ... onthe other hand, read someone went upto 1.7v on his SB rig and it didnt cause anything, still using it till date.
its safe. those fears arose out of people thinking that SB would be the same as the first core generation when it came to memory voltage.
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post #8 of 8
Thread Starter 
Quote:
Originally Posted by TwoCables View Post
Very! I see a little bit more of a fluctuation than that, even.
Sorry for my reeeeeeeeeeeeeeeeeally late reply.

Once again, thanks for answering my question. You definitely give out detailed answers.

Repped.

Quote:
is 1.65v safe for SB
According to Intel's certified 2nd gen i5/i7 lineup for XMP RAM, there are a couple that are @ 1.65v. That, and other information, led people into thinking that 1.65v is safe.

Anyways, it's safe to say that it's a safe voltage. Then again, if you're like me -- a person who "stresses" his PC from gaming (no benching here!) -- then something like 1.5v @ 1333MHz is... going to be sufficient (haven't seen any gains from 1600MHz when gaming).

Truth be told, I have my RAM at 1.5v @ 1333MHz. As for my RAM OC, I tried out ASUS' OC Tuner (yes, I know manual OC'ing is better -- just wanted to try it out, haha). I reverted back to default settings shortly after.
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