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Seeking Memory Advice!

post #1 of 5
Thread Starter 
Background: After a couple of bad kits and required RMA's, I've ended up with two separate 32GB Corsair Dominator GT kits with rated specs of 1,866 MHz at 9-10-9-27 timings. So....8 sticks total, at 8 GB per stick, for 64 GB total.

I've successfully tested each kit individually (4 sticks at a time) at the rated specs, and they run flawless. 12+ hours of memtest86 with no errors, and 12+ hours of Prime95 blend. No issues. And no heat issues either.

But....when I try and run all 8 sticks at the same time, at rated specs, I can't get the machine to post. And I've tried loosening the timings at various steps all the way up to 14-15-14-42, and still can't get stability. I can usually get the machine to post and windows to load if I increase voltage just a touch to 1.51 volts, but then Prime95 fails quickly. I've tried increasing voltage, at different timings, in small steps all the way up to 1.59 volts, with no success. When I research online...it sounds like my experience is not unusual. Apparently not many IMC's will run 8 sticks at more than 1,600 MHz.

So...next I turned the frequency down to 1,600 Mhz, and was able to successfully run memtest86 and Prime, with all 8 sticks, at the rated timings of 9-10-9-27. Rock solid. I played with tightening up the timings some, and got down to 8-8-8-24 while staying at 1.5 volts, and 1,600 MHz. That's the best I could do with all 8 sticks and 64GB installed.

Next I decided to see what kind of overclock I could get on just 4 sticks (or 32GB). I manually adjusted frequency to 2,133 MHz, and loosened up the timings significantly to 13-13-13-37. At first it wouldn't boot...but I gradually increased DRAM voltage in 0.1 increment steps....and once I got to 1.56 volts, I could boot the machine into Windows. memtest86 and Prime95 blend ran flawlessly. I started tightening up the timings one bit at a time, and got down to 11-11-11-31 and could still run memtest86 and Prime95 blend flawlessly. However, at 10-10-10-29 and 1.56 volts, it wouldn't boot. I dialed back a notch to 10-11-10-30.....and I could boot again....but it failed Prime95 quickly. I increased the DRAM voltage to 1.57......and now it runs memtest86 and Prime95 flawlessly again.

It takes time to zero in on the tightest timings for a given frequency and/or voltage. I'm going to keep tweaking...and probably can get a little bit better. But I wanted to ask you memory experts out there a question and hope for some constructive comments also.

Right now, I could choose between the following setups that have proved stable:

a) 64GB (8x8) running at 1,600Mhz and 8-8-8-24 timings, and 1.5 volts
b) 32GB (8x4) running at 1,866Mhz and 9-10-9-27 timings, and 1.5 volts
c) 32GB (8x4) running at 2,133Mhz and 10-11-10-30 timings and 1.57 volts

Questions for you:

1) Which of the 3 scenarios above would you choose and why?
2) Any suggestions for trying to reach 1,866Mhz with all 8 sticks installed?
3) Will any of the setups unduly hinder my future CPU overclock goals?
4) How bad is it to run 1.5 volt memory at 1.57 if you keep it up 24/7?
5) Max DRAM voltage I should consider safe for a 24/7 box?

Thanks in advance!
post #2 of 5
I'd chose c, but really nothing uses 64GB, and realistically all those variations won't be any faster in gaming and apps. RAM at least at 1600+ will not hinder overclocking and running them at volts between 1.5 and 1.65 is safe 24/7.
 
BitoHeaven
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BitoHeaven
(16 items)
 
Cigar ATX PC
(14 items)
 
CPUMotherboardGraphicsGraphics
Intel i7 4770k @ 4.5GHz Asus Maximus VI Gene Gigabyte R9 290 @ 1160MHz/1350MHz Gigabyte R9 290 @ 1160MHz/1350MHz 
RAMHard DriveHard DriveOptical Drive
G.Skill Trident X 2X8GB DDR3 2400MHz Samsung 840 PRO 256GB  Seagate Barracuda 7200.14 3TB SATA III 6Gb/s 64... Pioneer Blu-ray Burner 
CoolingOSMonitorKeyboard
Liquid Single Loop Triple Radiators Win 7 SP1 Professional x64bit  Samsung SynchMaster 24" Widescreen 1200p TFT-LC... Logitech G15 
PowerCaseMouseMouse Pad
EVGA SuperNOVA G2 1300w 80+ Gold Fully Modular  Fractal Design Arc Midi R2 Microsoft Sidewinder X5 Allsop Redmond Mouse Pad 
Audio
Cambridge Soundworks 5.1 
CPUMotherboardGraphicsRAM
Intel Core i5-3570K @ 4.6GHz ASRock Z77E-ITX mITX  Sapphire HD 7990 @ 1090MHz/1600MHz G.SKILL Ripjaws 2X4GB DDR3-1600 @ 1866MHz 
Hard DriveHard DriveOptical DriveCooling
Crucial SSD 128GB mSATA SATA III 6GB  Seagate Barracuda 7200.12 1TB SATA II 32MB 7200RPM LG DVD R/W SATA with LightScribe Corsair Cooling Hydro Series H100 
OSMonitorKeyboardPower
Win 7 Professional x64bit Samsung 52" 1080p 60Hz LCD Logitech Wireless K330 Corsair AX850 Gold Fully Modular 
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BitFenix Prodigy Mini-ATX Black  Logitech Wireless M215 Corsair Vengeance MM200 Yamaha RX-V681 & PSB/Polk Audio 5.1 
CPUMotherboardGraphicsRAM
AMD Athlon II X4 640 ASRock N68C-GS NVIDIA 6600GT G. Skill Ripjaws DDR3 1600MHz 
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WD Caviar Blue 500GB 16MB Cache 7200RPM LG Optical Drive Thermaltake Max Orb Windows 7 
MonitorKeyboardPowerCase
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post #3 of 5
1) a) if you really need 64Gb, c) if you don't.
2) Ty higher vccio and vccsa voltages
3) Most likely, it will. Since a CPU overclock yields a lot more than a memory overclock, you might have to resest what memclocks you rig can (still) do after you overclock the CPU.
4) Not bad at all.
5) It depends on a lot of factors (ICs, PCB quality, temperature) but I'd say 1.65-1.70 should be perfectly safe in almost every case.
post #4 of 5
Thread Starter 
Quote:
Originally Posted by Gunderman456 View Post

I'd chose c, but really nothing uses 64GB, and realistically all those variations won't be any faster in gaming and apps. RAM at least at 1600+ will not hinder overclocking and running them at volts between 1.5 and 1.65 is safe 24/7.

Quote:
Originally Posted by Sam OCX View Post

1) a) if you really need 64Gb, c) if you don't.
2) Ty higher vccio and vccsa voltages
3) Most likely, it will. Since a CPU overclock yields a lot more than a memory overclock, you might have to resest what memclocks you rig can (still) do after you overclock the CPU.
4) Not bad at all.
5) It depends on a lot of factors (ICs, PCB quality, temperature) but I'd say 1.65-1.70 should be perfectly safe in almost every case.

Thanks guys. I guess I won't know for sure my memory needs until I get more. Right now, I have 12gb in my X58 box....and I routinely use up all of it when I'm working with video editing and rendering. So I know I can use more....just don't know how much more. I'm intrigued with the idea of a ramdisk if I end up with unneeded memory.
post #5 of 5
Hey Chris, looks like your IMC isn't too happy with all the work you're giving it. As Sam said: try playing around with VccIO / VccSA voltages (mostly VccIO I reckon, wouldn't touch SA too much but if a little bit helps...).

Video editing you say? hmmm, a ramdisk with that 64GB does sound sweet then thumb.gif
Personally, I don't think 1866 adds much and those are decent timings for 1600 so I would go for that setup. But definitely give 1866 after tinkering with IO voltages a try again.

EDIT: 1.57 V isn't even something to get worried about ;-) .
EDIT2 : In terms of hindering future CPU overclocking: I usually leave my RAM at 1333 with loose timings so I can fully focus on the CPU. Then turn it back up. It does have an effect on CPU overclocking, but nothing a little extra voltage can fix ( or less, more isn't always better)
Edited by Bloitz - 11/8/12 at 8:36am
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