Overclock.net › Forums › Components › Memory › What is the meaning of the advertised dram voltage?
New Posts  All Forums:Forum Nav:

What is the meaning of the advertised dram voltage?

post #1 of 6
Thread Starter 
I have dimms advertised as accepting the standard 1.65 voltage. I'm wondering if this is a hard limitation inherent in the silicon that will mean if you increase the voltage much more you will simply fry the stick, or if it is only a guideline similarly to how they say to stay below 1.3v on the QPI but you can really go higher?
Contuter
(14 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 SLBEJ OC'd @ 4.4 ghz Gigabyte GA-EX58-UD3R Rev 1.6 MSI GTX 780 twin frozr Kingston HyperX 2000mhz @ 1600mhz 6-6-6-16 
Hard DriveHard DriveOptical DriveOS
Seagate Barracuda 7200.12 1TB SATA-2 Samsung SSD 840 EVO 120GB Samsung SH-S223B/BEBE 22x DVD±RW SATA Dual Layer Windows 7 Home Premium 64 bit OEM 
MonitorPowerCase
Dell U2410 Cooler Master m700 Real Power Cooler Master Centurion 590 
  hide details  
Reply
Contuter
(14 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 SLBEJ OC'd @ 4.4 ghz Gigabyte GA-EX58-UD3R Rev 1.6 MSI GTX 780 twin frozr Kingston HyperX 2000mhz @ 1600mhz 6-6-6-16 
Hard DriveHard DriveOptical DriveOS
Seagate Barracuda 7200.12 1TB SATA-2 Samsung SSD 840 EVO 120GB Samsung SH-S223B/BEBE 22x DVD±RW SATA Dual Layer Windows 7 Home Premium 64 bit OEM 
MonitorPowerCase
Dell U2410 Cooler Master m700 Real Power Cooler Master Centurion 590 
  hide details  
Reply
post #2 of 6
Its the voltage that is recommended by the manufacture, there is also low voltage memory (1.5v) - they let you know so that you set the voltage correctly, unless you are doing some super heavy overclocking on your memory, there is usually no reason to even over volt the memory.
The Laptop
(6 items)
 
  
CPUGraphicsRAMHard Drive
Intel i7 2860QM AMD Radeon HD 6770M Corsair Vengence 1600MHz Samsung 840 Pro 256GB 
OSMonitor
Mac OS X 10.8 1680 x 1050 anti-glare high resolution  
  hide details  
Reply
The Laptop
(6 items)
 
  
CPUGraphicsRAMHard Drive
Intel i7 2860QM AMD Radeon HD 6770M Corsair Vengence 1600MHz Samsung 840 Pro 256GB 
OSMonitor
Mac OS X 10.8 1680 x 1050 anti-glare high resolution  
  hide details  
Reply
post #3 of 6
Thread Starter 
Quote:
Originally Posted by appleg33k85;12336468 
Its the voltage that is recommended by the manufacture, there is also low voltage memory (1.5v) - they let you know so that you set the voltage correctly, unless you are doing some super heavy overclocking on your memory, there is usually no reason to even over volt the memory.

And if I were? I know what's prudent, but what kind of figures would be pushing it and what would be completely out of the question? Does raising the DRAM voltage even help much or is it more about the qpi?

Additionally if the stick is advertised as 2000 mhz (it isn't, it's 1600) would that in any way relate to what voltage I can get away with?
Contuter
(14 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 SLBEJ OC'd @ 4.4 ghz Gigabyte GA-EX58-UD3R Rev 1.6 MSI GTX 780 twin frozr Kingston HyperX 2000mhz @ 1600mhz 6-6-6-16 
Hard DriveHard DriveOptical DriveOS
Seagate Barracuda 7200.12 1TB SATA-2 Samsung SSD 840 EVO 120GB Samsung SH-S223B/BEBE 22x DVD±RW SATA Dual Layer Windows 7 Home Premium 64 bit OEM 
MonitorPowerCase
Dell U2410 Cooler Master m700 Real Power Cooler Master Centurion 590 
  hide details  
Reply
Contuter
(14 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 SLBEJ OC'd @ 4.4 ghz Gigabyte GA-EX58-UD3R Rev 1.6 MSI GTX 780 twin frozr Kingston HyperX 2000mhz @ 1600mhz 6-6-6-16 
Hard DriveHard DriveOptical DriveOS
Seagate Barracuda 7200.12 1TB SATA-2 Samsung SSD 840 EVO 120GB Samsung SH-S223B/BEBE 22x DVD±RW SATA Dual Layer Windows 7 Home Premium 64 bit OEM 
MonitorPowerCase
Dell U2410 Cooler Master m700 Real Power Cooler Master Centurion 590 
  hide details  
Reply
post #4 of 6
They tell you what voltage they are designed to run at anything higher is technically increasing the chance of burning the ram out. Then there's the whole don't go above 1.65v due to the integrated ram controller on the cpu thing. There's ddr3-1333,1600,2000 etc and they all use varying volts, the most common seems to be 1.6-1.65.
post #5 of 6
i use whatever voltage the ram needs, right now it needs 1.5v so that what its set at.
if the ram does better with voltage than go ahead and give it more.
post #6 of 6
Quote:
Originally Posted by auricgoldfinger View Post
And if I were? I know what's prudent, but what kind of figures would be pushing it and what would be completely out of the question? Does raising the DRAM voltage even help much or is it more about the qpi?

Additionally if the stick is advertised as 2000 mhz (it isn't, it's 1600) would that in any way relate to what voltage I can get away with?
Depends on the ram and its tolerance for more voltage. Use what you are comfortable with for your overclock. Don't be afraid of a little more voltage though, its keeping your QPI/VTT and vdimm in a .5v range that you have to be aware of.

Increasing DRAM voltage helps for trying to get your memoc to run / run stabilly above its rated spec.

The QPI/VTT is different, it involves your CPU's IMC's Uncore. On the 920 for example, the NB Frequency is required to run at 2x your ram speed. For 2000Mhz of ram this is 4000ghz uncore/nb frequency.

This is stress for the IMC, and as a result, needs more QPI/VTT to stabilize. Some chips need lots of QPI/VTT to stabilize, more then what most people are comfortable with. So yeah, QPI/VTT is important, but its used for trying to get your IMC to run at a higher speed stably without crapping out, rather then trying to get your ram to run at timings/frequencies that are out of its spec, in that situation, more vDIMM is required.

You should have a good idea of what your i7 can do in terms of QPI/VTT and uncore.

tl;dr

high overclock on your ram == more dram voltage
  • advertised voltage > the voltage the manufacturer tested their ram's speed and timings to run stably at.
  • voltage tolerance varies really, so do what your comfortable with.
  • qpi is more about stabilizing your uncore to support your rams speed rather then stabilizing your ram's overclock or trying to make it run above spec( even though a low qpi/vtt for too much uncore can result in instability ).
IMC stabillity > QPI/VTT.
Tighter Timings / Faster Frequencies > DRAM Voltage.

Edited by dTT05 - 2/10/11 at 2:58pm
Fresh
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 950 @ 4.0ghz 1.33v qpi/vtt @ 1.35v asus rampage iii extreme evga gtx 580 superclocked 1600 6-6-5-15-1T 
Hard DriveOSMonitorKeyboard
ocz vertex 2 ssd 60gb & 1tb wd caviar black win7 64bit ultimate acer 24" 1080p saitek eclipse 
PowerCaseMouseMouse Pad
enermax revolution85+ 1050w cm haf 932 deathadder qck+ 
  hide details  
Reply
Fresh
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 950 @ 4.0ghz 1.33v qpi/vtt @ 1.35v asus rampage iii extreme evga gtx 580 superclocked 1600 6-6-5-15-1T 
Hard DriveOSMonitorKeyboard
ocz vertex 2 ssd 60gb & 1tb wd caviar black win7 64bit ultimate acer 24" 1080p saitek eclipse 
PowerCaseMouseMouse Pad
enermax revolution85+ 1050w cm haf 932 deathadder qck+ 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Memory
Overclock.net › Forums › Components › Memory › What is the meaning of the advertised dram voltage?