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overclocking crucial RAM

post #1 of 7
Thread Starter 
I had been discussing my crashes in another thread, but I think I solved that (turns out it was caused by having a game controller plugged into my front USB port, and static build-up was apparently locking the computer randomly!).

Anyway I've been re-evaluating my RAM. A lot of reviews on NewEgg say they've overclocked it quite a bit, so I am not so quick to jump to upgrade if that is true.

This is the RAM: http://www.newegg.com/Product/Produc...D=3463938&SID=

I have three sticks of it (again, not optimal, I know).

Anyway, during one OC session where I let the MB decide the voltages, I had it nice and stable with 965BE at 4.0 Ghz on a bus OC. I had the RAM at 1500 and at 8-8-8, and it was all stable. Only thing I realized after going back in to lock in the settings is that the ram was running at 1.85V!!!

So I quickly undid it all. I mean, RAM used to run much higher than this, but the RAM is rated at 1.5V. Will it really fry the RAM in short order at that voltage? How would I tell, since there's no heat sensor on the RAM? (other than using infrared temp gun, which I do not have)

Going to put my rig in my sig now too.
Cool Killer
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CPUMotherboardGraphicsRAM
Phenom II X4 965BE C3 125W ASUS M4A89GTD PRO/USB3 XFX 5870 Crucial 2GBx3 DDR3 (CT25664BA1339) 
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Cool Killer
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CPUMotherboardGraphicsRAM
Phenom II X4 965BE C3 125W ASUS M4A89GTD PRO/USB3 XFX 5870 Crucial 2GBx3 DDR3 (CT25664BA1339) 
Hard DriveOptical DriveOSMonitor
WD Black WD5001AALS 500GB + WD7501AALS 750GB SAMSUNG Black 22X DVD+R 8X DVD+RW 16X DVD+R DL 22X Windows 7 Home 64-bit Pioneer 50" Plasma TV - 720P 
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post #2 of 7
Crucial RAM = Micron ICs
Don't ever let MB decide voltages, however around 1.85V is indeed where you want to be to be OC-ing Micron IC RAM. You will want to find some heatspreaders to safely run that voltage, but with those heatspreaders it can run that.
Being generic timing to begin with though, don't expect to go too far
Last thing is, you should either toss one of your DIMMs or add another one. 3 DIMMs runs interleaved single channel..... not very optimal because once you start using more than 4GB, bandwidth gets instantly halved to single channel and you lose a lot of performance
post #3 of 7
Thread Starter 
Interesting. I figured it must need it, because without it, I am only able to get the system Prime Stable by underclocking my RAM to 1066!

If I wanted to proceed without spreaders, do you think 1.65v would be okay? Ultimately what happens if I don't use spreaders - does the RAM get burnt or it will just malfunction/crash? Does it behave the same as CPU overheating?

Also, I mentioned this in the other thread, but in CPU-z it says that it is dual channel - I guess it is only looking at the first bank then (or the tech specs, and not what it's operating at)? Are you saying it could be slowing down in operation only as it starts addressing that additional 2 GB (above the 4GB)? That is fascinating!

I am definitely going to add another stick or go with 2x4GB, just want to see how far I can take this RAM first before spending $120 on a new set (vs. $25 on one more stick of this).

And hey, how come it seems like you're the only one who responds to me?
Cool Killer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X4 965BE C3 125W ASUS M4A89GTD PRO/USB3 XFX 5870 Crucial 2GBx3 DDR3 (CT25664BA1339) 
Hard DriveOptical DriveOSMonitor
WD Black WD5001AALS 500GB + WD7501AALS 750GB SAMSUNG Black 22X DVD+R 8X DVD+RW 16X DVD+R DL 22X Windows 7 Home 64-bit Pioneer 50" Plasma TV - 720P 
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Cool Killer
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CPUMotherboardGraphicsRAM
Phenom II X4 965BE C3 125W ASUS M4A89GTD PRO/USB3 XFX 5870 Crucial 2GBx3 DDR3 (CT25664BA1339) 
Hard DriveOptical DriveOSMonitor
WD Black WD5001AALS 500GB + WD7501AALS 750GB SAMSUNG Black 22X DVD+R 8X DVD+RW 16X DVD+R DL 22X Windows 7 Home 64-bit Pioneer 50" Plasma TV - 720P 
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post #4 of 7
Yes, CPU-Z is only using the first bank and recognizing it as dual channel. RAM is interleaved to use the 2x2GB in dual channel until you need more than that, after which all of it has to revert to performance of slowest DIMM which is single channel. The extra RAM benefit may not be worth the speed loss, which can be quite significant. According to Intel spec sheets from around 2003-2004 when dual channel was first introduced with DDR memory, this is how it works.

If you don't use heatspreaders, 1.65V is actually quite fine. Many people state that only around 1.7-1.75V+ you start to need heatspreaders on DDR3. Most DDR3 can run fairly cool. However at only 1.65V still don't expect the best OC results out of Micron ICs.

Eh, sometimes I do indeed feel that way... must be all you other shenaniagns being lazy and letting me do all the work....
post #5 of 7
Thread Starter 
Right, got it. Very much appreciated! Also as of last night I've been trying the RAM at 1066 but with CAS 8-8-8-21, and it's stable at 1.5v with a 3.8 Ghz overclock via multiplier (but no increase to NB frequency yet). So with a bit more voltage I think I wll be able to experiment a good bit more again. Maybe I'll take one stick out and see how that affects the SuperPi calculation times.
Cool Killer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X4 965BE C3 125W ASUS M4A89GTD PRO/USB3 XFX 5870 Crucial 2GBx3 DDR3 (CT25664BA1339) 
Hard DriveOptical DriveOSMonitor
WD Black WD5001AALS 500GB + WD7501AALS 750GB SAMSUNG Black 22X DVD+R 8X DVD+RW 16X DVD+R DL 22X Windows 7 Home 64-bit Pioneer 50" Plasma TV - 720P 
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Logitech EX100 wireless Antec TruePower New TP-550 Antec 900 SteelSeries XXL + Logitech EX100 wireless 
Mouse Pad
RocketFish dual sided game pad 
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Cool Killer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X4 965BE C3 125W ASUS M4A89GTD PRO/USB3 XFX 5870 Crucial 2GBx3 DDR3 (CT25664BA1339) 
Hard DriveOptical DriveOSMonitor
WD Black WD5001AALS 500GB + WD7501AALS 750GB SAMSUNG Black 22X DVD+R 8X DVD+RW 16X DVD+R DL 22X Windows 7 Home 64-bit Pioneer 50" Plasma TV - 720P 
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RocketFish dual sided game pad 
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post #6 of 7
8-8-8!? You should be running it at 7-7-7 at 1066Mhz. Even then I really don't recommend running DDR3 that low as it removes all the speed benefit of DDR3.
post #7 of 7
Thread Starter 
Heh, I know, just taking small steps. Just didn't want to leave my machine possibly unstable without time to test for the remainder of the day. Next time I tweak I will definitely bring freq back up and add the voltage it needs. Just need to find time to really properly OC the memory first without the CPU OC and test a lot.

Also I guess it is dumb to spend a lot of time tweaking if I will just replace the RAM soon anyway, right, and have a lot more OC headroom that way (especially if I get 1600 RAM to be more future proof).
Cool Killer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X4 965BE C3 125W ASUS M4A89GTD PRO/USB3 XFX 5870 Crucial 2GBx3 DDR3 (CT25664BA1339) 
Hard DriveOptical DriveOSMonitor
WD Black WD5001AALS 500GB + WD7501AALS 750GB SAMSUNG Black 22X DVD+R 8X DVD+RW 16X DVD+R DL 22X Windows 7 Home 64-bit Pioneer 50" Plasma TV - 720P 
KeyboardPowerCaseMouse
Logitech EX100 wireless Antec TruePower New TP-550 Antec 900 SteelSeries XXL + Logitech EX100 wireless 
Mouse Pad
RocketFish dual sided game pad 
  hide details  
Reply
Cool Killer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X4 965BE C3 125W ASUS M4A89GTD PRO/USB3 XFX 5870 Crucial 2GBx3 DDR3 (CT25664BA1339) 
Hard DriveOptical DriveOSMonitor
WD Black WD5001AALS 500GB + WD7501AALS 750GB SAMSUNG Black 22X DVD+R 8X DVD+RW 16X DVD+R DL 22X Windows 7 Home 64-bit Pioneer 50" Plasma TV - 720P 
KeyboardPowerCaseMouse
Logitech EX100 wireless Antec TruePower New TP-550 Antec 900 SteelSeries XXL + Logitech EX100 wireless 
Mouse Pad
RocketFish dual sided game pad 
  hide details  
Reply
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