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Ivy Bridge, TridentX overclocking

post #1 of 7
Thread Starter 
Hi there, folks.

I'd like to start out by mentioning right off the bat that I am running software which, as I recently learned, is (usually) memory bandwidth limited. I didn't know anything like that even existed, so when I built this computer, I just dropped my RAM in, punched in the defaults and never looked back. The reason I say this is I would like to avoid replies like "No real applications will see benefits from further memory overclocking." Admittedly, I would have said that myself a week ago had someone not specified that their computations are in fact bandwidth limited. I am running Prime95, if you must know.


The RAM I am using is G.Skill's 2x8GB TridentX 2400MHz kit at http://www.newegg.ca/Product/Product.aspx?Item=N82E16820231589. I was lucky enough to get it for $120 about a month before it became $50 more expensive... I am using all the default settings. 2400MHz, 10-12-12-31, 1.65V.

I've never done much looking into RAM overclocking because I honestly didn't think it was worth it. I've recently learned that it does make a difference, and I went and checked for myself. I ran a quick custom benchmark, running a few thousand iterations of the same exponent on 1, 2, 3 then 4 cores and the iterations averaged to 11ms, 11ms, 12ms and then 14ms, respectively. The slight slow down indicates that with four cores running, the memory is JUST struggling to keep the CPU fed. My i5-3570k is running at 4.6GHz though when I ditch my H80i in favour of custom water, I would like to push it a bit further, to possibly 4.8GHz (or more, depending on how the chip decides to behave). I would therefore like to push my RAM just a bit further if possible.


After several days of Prime95 (during which time the memory is essentially maxed for throughput) the modules are warm, especially around the base, but are not so hot that I can't keep my fingers there for ever. It's actually a pleasant kind of warmth.

How hot can RAM get without any hardware problems?
Does overvolting present any other danger than increased heat? I.e., does the voltage itself cause any direct harm?
What general procedure should I follow to see what my sticks can handle?


I would like this whole process to cause no damage to my modules as well. I AM quite pleased to be running at 2400MHz and if tests determine that 2400MHz is the best I can do, that's fine as long as my RAM is still in good shape at the end of it all.


Thank you,
post #2 of 7
I have these same memories. I have been running them at 2167 with a little extra bclk. I have the timings set to 9-9-11-26-1T @ 1.63V. That seems to be a little quicker in Maxxmem and Aida than with the memory at 2400MHz and stock timings. Maybe try something close to my settings on your board at 2133. Multiplier overclocking gave me the biggest jump in bandwidth but you can you use your bclk to squeeze a bit more out if you feel the need.
Edited by DarkrReign2049 - 6/8/13 at 8:47am
Ananke
(13 items)
 
   
CPUMotherboardGraphicsRAM
5930k Asus Rampage V Extreme EVGA GeForce GTX 1080 Ti FTW3 G.SKILL TridentZ Series 64GB (F4-3200C14Q-64GTZ) 
Hard DriveCoolingOSMonitor
Samsung 950 Pro Custom water Windows 10 ASUS ROG Swift PG279Q 
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Corsair K95 RGB PLATINUM EVGA SuperNOVA 1300 G2 Case Labs MAGNUM STH10 Logitech G502 Proteus Spectrum 
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Glorius PC gaming XXL 
CPUMotherboardGraphicsRAM
i7 3930K Asus Rampage IV Extreme EVGA 780 Classified 32 GB GSkill Trident X 2400MHz 
Hard DriveCoolingOSMonitor
Samsung 840 Pro 256 Custom Water Windows 8 Pro x64 CatLeap 27" IPS 
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Corsair HX750 Corsair 800D 
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Ananke
(13 items)
 
   
CPUMotherboardGraphicsRAM
5930k Asus Rampage V Extreme EVGA GeForce GTX 1080 Ti FTW3 G.SKILL TridentZ Series 64GB (F4-3200C14Q-64GTZ) 
Hard DriveCoolingOSMonitor
Samsung 950 Pro Custom water Windows 10 ASUS ROG Swift PG279Q 
KeyboardPowerCaseMouse
Corsair K95 RGB PLATINUM EVGA SuperNOVA 1300 G2 Case Labs MAGNUM STH10 Logitech G502 Proteus Spectrum 
Mouse Pad
Glorius PC gaming XXL 
CPUMotherboardGraphicsRAM
i7 3930K Asus Rampage IV Extreme EVGA 780 Classified 32 GB GSkill Trident X 2400MHz 
Hard DriveCoolingOSMonitor
Samsung 840 Pro 256 Custom Water Windows 8 Pro x64 CatLeap 27" IPS 
PowerCase
Corsair HX750 Corsair 800D 
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post #3 of 7
Thread Starter 
Did you leave the voltage alone?

I'd like to have an idea of if 1.70V, 1.75V or something is okay on the memory before trying it myself. It's been difficult to find much information.
post #4 of 7
Thread Starter 
I was going to get started with my memory this afternoon. The system wouldn't even boot just from me getting my feet wet so I may just give up unless there's something obvious I am missing.

Stock settings are 2400MHz 10-12-12-31, 1.65V RAM, with the VCCIO and VCCSA both around 1.1V. I tried just setting the frequency to 2600MHz and POST failed with error code 23. I loosened the timings to 11-13-13-35 and still got error code 23.

Does the VCCIO need to be bumped up? Does this look like the sticks themselves are at their limit or is it the IMC?
post #5 of 7
From the reviews I've read, these sticks don't like to be overclocked past 2500MHz. I have my VTT and VCCSA at around 1.125 and you may need higher for your platform, just don't go above 1.2. I did change my command rate from 2T to 1T at the stock 2400MHz settings and that helped with bandwidth a little. So far I have not ran the voltage above 1.65V because I have not needed it.
Ananke
(13 items)
 
   
CPUMotherboardGraphicsRAM
5930k Asus Rampage V Extreme EVGA GeForce GTX 1080 Ti FTW3 G.SKILL TridentZ Series 64GB (F4-3200C14Q-64GTZ) 
Hard DriveCoolingOSMonitor
Samsung 950 Pro Custom water Windows 10 ASUS ROG Swift PG279Q 
KeyboardPowerCaseMouse
Corsair K95 RGB PLATINUM EVGA SuperNOVA 1300 G2 Case Labs MAGNUM STH10 Logitech G502 Proteus Spectrum 
Mouse Pad
Glorius PC gaming XXL 
CPUMotherboardGraphicsRAM
i7 3930K Asus Rampage IV Extreme EVGA 780 Classified 32 GB GSkill Trident X 2400MHz 
Hard DriveCoolingOSMonitor
Samsung 840 Pro 256 Custom Water Windows 8 Pro x64 CatLeap 27" IPS 
PowerCase
Corsair HX750 Corsair 800D 
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Ananke
(13 items)
 
   
CPUMotherboardGraphicsRAM
5930k Asus Rampage V Extreme EVGA GeForce GTX 1080 Ti FTW3 G.SKILL TridentZ Series 64GB (F4-3200C14Q-64GTZ) 
Hard DriveCoolingOSMonitor
Samsung 950 Pro Custom water Windows 10 ASUS ROG Swift PG279Q 
KeyboardPowerCaseMouse
Corsair K95 RGB PLATINUM EVGA SuperNOVA 1300 G2 Case Labs MAGNUM STH10 Logitech G502 Proteus Spectrum 
Mouse Pad
Glorius PC gaming XXL 
CPUMotherboardGraphicsRAM
i7 3930K Asus Rampage IV Extreme EVGA 780 Classified 32 GB GSkill Trident X 2400MHz 
Hard DriveCoolingOSMonitor
Samsung 840 Pro 256 Custom Water Windows 8 Pro x64 CatLeap 27" IPS 
PowerCase
Corsair HX750 Corsair 800D 
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post #6 of 7
Thread Starter 
I did a bit of digging. Someone was having some trouble getting their sticks to 2600MHz as well (they actually purchased a 2600MHz kit) and they managed to get it with CPU PLL at 1.7V, VCCSA at 1.15V and VCCIO at 1.175V.

They posted the results of some tests done which indicated a good range for CPU PLL is 1.5V-1.8V with 1.89V being the max, VCCSA being between 0.925V-1.1V with 1.2V as the max, VCCIO being at 1.0V-1.1V with 1.2V max.

I haven't ever fiddled with any of those voltages before, so I'm quite sure I was using the defaults. CPU PLL was already at 1.81V and I nudged the VCCSA and VCCIO up to roughly 1.175V from 1.15V. I was able to boot into the UEFI with these settings. CPU-Z verified that the memory was running at 2600MHz. However, the RAM gave errors in memtest86+ (about 50 by the fourth pass). I bumped the RAM voltage to 1.7V from 1.65V and ran memtest86+ again. There were only about 15 errors in 5 passes.

I don't feel very comfortable pushing the RAM voltage any higher. Is it safe? Is there anything else I can try first?
post #7 of 7
I've been running my VCCSA and VTT @ 1.125 and PLL at 1.55 for 2400, same as what I've been running for my current memory speed of 2167. 2600Mhz will probably be harder depending on the CPU series. With my 3930K I probably wouldn't have to much luck but a Ivy or Haswell shouldn't have a problem. Personally I wouldn't go to much over 1.7v for my 24/7 volts. I think every memory chip type is different and it may be ok to run over that, but that's my personal safe limit.
Ananke
(13 items)
 
   
CPUMotherboardGraphicsRAM
5930k Asus Rampage V Extreme EVGA GeForce GTX 1080 Ti FTW3 G.SKILL TridentZ Series 64GB (F4-3200C14Q-64GTZ) 
Hard DriveCoolingOSMonitor
Samsung 950 Pro Custom water Windows 10 ASUS ROG Swift PG279Q 
KeyboardPowerCaseMouse
Corsair K95 RGB PLATINUM EVGA SuperNOVA 1300 G2 Case Labs MAGNUM STH10 Logitech G502 Proteus Spectrum 
Mouse Pad
Glorius PC gaming XXL 
CPUMotherboardGraphicsRAM
i7 3930K Asus Rampage IV Extreme EVGA 780 Classified 32 GB GSkill Trident X 2400MHz 
Hard DriveCoolingOSMonitor
Samsung 840 Pro 256 Custom Water Windows 8 Pro x64 CatLeap 27" IPS 
PowerCase
Corsair HX750 Corsair 800D 
  hide details  
Reply
Ananke
(13 items)
 
   
CPUMotherboardGraphicsRAM
5930k Asus Rampage V Extreme EVGA GeForce GTX 1080 Ti FTW3 G.SKILL TridentZ Series 64GB (F4-3200C14Q-64GTZ) 
Hard DriveCoolingOSMonitor
Samsung 950 Pro Custom water Windows 10 ASUS ROG Swift PG279Q 
KeyboardPowerCaseMouse
Corsair K95 RGB PLATINUM EVGA SuperNOVA 1300 G2 Case Labs MAGNUM STH10 Logitech G502 Proteus Spectrum 
Mouse Pad
Glorius PC gaming XXL 
CPUMotherboardGraphicsRAM
i7 3930K Asus Rampage IV Extreme EVGA 780 Classified 32 GB GSkill Trident X 2400MHz 
Hard DriveCoolingOSMonitor
Samsung 840 Pro 256 Custom Water Windows 8 Pro x64 CatLeap 27" IPS 
PowerCase
Corsair HX750 Corsair 800D 
  hide details  
Reply
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