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Definitive Answer to the .5v Rule on Ivy Bridge QPI/VTT

post #1 of 6
Thread Starter 
In the old days (i.e. socket 1366 / x58) it was widely accepted that the QPI/VTT - QPI/DRAM had to be set within .5v of the DRAM voltage.

Is the .5v rule still applicable to socket 1155 and specifically Ivy Bridge? I've done a lot of online research and the responses I've found range from one end of the spectrum to the other.

I'd appreciate it if someone with o/c experience on Ivy Bridge give me some guidance. I'm completely 4.4Ghz stable @ 1.20v core on this 3770K and it only takes 1.08v on QPI/VTT to get my memory stable at 2133Mhz.

But the catch is that my DRAM voltage spec. is 1.65v @ 2400Mhz, however it will happily run at 1.63 - 1.64v for 2133Mhz.

Right now the difference in my QPI/VTT is; 1.64v DRAM - 1.08v QPI/VTT = .56v

So do you think I'm ok with that difference? Or, would it be better to set QPI/VTT to 1.14v and keep it within .5v of the DRAM voltage?
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wevs rig
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post #2 of 6
If you're stable, and passed MemTest and such, then I think having a lower voltage is great, even if 1.65V wouldn't lower the longevity of your DIMMs.
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Folder Rodriguez
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CPUMotherboardGraphicsRAM
i7 3770k MAXIMUS V FORMULA EVGA 680 FTW+ 4GB  16GB (2x8GB) G.SKILL Trident X 2400mHz CL10 1.65V 
Hard DriveHard DriveOptical DriveCooling
Corsair Force 3 120GB SSD Seagate SV35.5 2TB 64MB cache 7200 RPM HDD LG blu-ray R/W Heatkiller CU 3.0 Nickel/Black 115X 
CoolingCoolingCoolingOS
Swiftech MCP355 w/ Petra's Mod Top Undecided radiator config 12mm OD push fittings, and E22 12mm acrylic tubing Slackware 64-bit 
OSMonitorKeyboardPower
Arch Linux 64-bit Asus 24" 1920x1080 LED Rosewill 9000 w/ MX Blues Seasonic X650 
CaseMouseMouse PadOther
Scratch build test bench Logitech G600 black Xtrac Ripper XXL 2x Corsair AF 140mm quiet edition case fans 
Other
Promilatech PK-1 
AudioAudioAudioOther
**Possibly used** HifiMan HE-500 headphones **USED** Schiit Lyr headphone amp Jolida Glass FX Tube DAC EK Nickel CSQ 680+ Waterblock 
OtherOtherOther
2x Aplhacool NexXxos UT60 360mm full copper rad... 6x Scythe Gentle Typhoon 1450 RPM fans 10 meters of 12mm OD nickel plated copper pipe,... 
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post #3 of 6
Thread Starter 
Thanks Briddel. I'm rock solid stable at the voltages I noted in my first post. 24 hours Prime95 blend, 4 hours OCCT large data set, overnight Memtest etc.

My gut feeling was that the ".5V" rule was being carried over from x58 and even worse, some of the stuff I've read it's apparent that some people don't know the difference between QPI/vTT, DRAM Voltage, CPU VTT, CPU vcore etc. just spouting off nonsense.

I see that you're running high speed 1.65v memory too. What QPI/VTT does it take to run 2400Mhz on your rig?
wevs rig
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Asus DVD / Bluray LG Bluray / Burner Custom H20 - Swiftech, XSPC Windows 7 Pro x64 
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wevs rig
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Hard DriveHard DriveHard DriveHard Drive
Crucial C300 128Gb x2 RAID0  SK Hynix SH910 128Gb x2 RAID0 Western Digital Black Edition 1Tb Western Digital Black Edition 640Gb 
Optical DriveOptical DriveCoolingOS
Asus DVD / Bluray LG Bluray / Burner Custom H20 - Swiftech, XSPC Windows 7 Pro x64 
MonitorKeyboardPowerCase
Acer P243Waid Razer Black Widow Ultimate Corsair HX1000 Corsair C70 White Edition 
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post #4 of 6
Quote:
Originally Posted by wevsspot View Post

Thanks Briddel. I'm rock solid stable at the voltages I noted in my first post. 24 hours Prime95 blend, 4 hours OCCT large data set, overnight Memtest etc.

My gut feeling was that the ".5V" rule was being carried over from x58 and even worse, some of the stuff I've read it's apparent that some people don't know the difference between QPI/vTT, DRAM Voltage, CPU VTT, CPU vcore etc. just spouting off nonsense.

I see that you're running high speed 1.65v memory too. What QPI/VTT does it take to run 2400Mhz on your rig?

I haven't gone lower than 1.2V for now.
Folder Rodriguez
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CPUMotherboardGraphicsRAM
i7 3770k MAXIMUS V FORMULA EVGA 680 FTW+ 4GB  16GB (2x8GB) G.SKILL Trident X 2400mHz CL10 1.65V 
Hard DriveHard DriveOptical DriveCooling
Corsair Force 3 120GB SSD Seagate SV35.5 2TB 64MB cache 7200 RPM HDD LG blu-ray R/W Heatkiller CU 3.0 Nickel/Black 115X 
CoolingCoolingCoolingOS
Swiftech MCP355 w/ Petra's Mod Top Undecided radiator config 12mm OD push fittings, and E22 12mm acrylic tubing Slackware 64-bit 
OSMonitorKeyboardPower
Arch Linux 64-bit Asus 24" 1920x1080 LED Rosewill 9000 w/ MX Blues Seasonic X650 
CaseMouseMouse PadOther
Scratch build test bench Logitech G600 black Xtrac Ripper XXL 2x Corsair AF 140mm quiet edition case fans 
Other
Promilatech PK-1 
AudioAudioAudioOther
**Possibly used** HifiMan HE-500 headphones **USED** Schiit Lyr headphone amp Jolida Glass FX Tube DAC EK Nickel CSQ 680+ Waterblock 
OtherOtherOther
2x Aplhacool NexXxos UT60 360mm full copper rad... 6x Scythe Gentle Typhoon 1450 RPM fans 10 meters of 12mm OD nickel plated copper pipe,... 
CPUMotherboardAudioAudio
4770k Asus Maximus VI Impact Audeze LCD-2 Woo Audio WA3  
Audio
Jolida Tube FX DAC 
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Reply
Folder Rodriguez
(21 items)
 
   
CPUMotherboardGraphicsRAM
i7 3770k MAXIMUS V FORMULA EVGA 680 FTW+ 4GB  16GB (2x8GB) G.SKILL Trident X 2400mHz CL10 1.65V 
Hard DriveHard DriveOptical DriveCooling
Corsair Force 3 120GB SSD Seagate SV35.5 2TB 64MB cache 7200 RPM HDD LG blu-ray R/W Heatkiller CU 3.0 Nickel/Black 115X 
CoolingCoolingCoolingOS
Swiftech MCP355 w/ Petra's Mod Top Undecided radiator config 12mm OD push fittings, and E22 12mm acrylic tubing Slackware 64-bit 
OSMonitorKeyboardPower
Arch Linux 64-bit Asus 24" 1920x1080 LED Rosewill 9000 w/ MX Blues Seasonic X650 
CaseMouseMouse PadOther
Scratch build test bench Logitech G600 black Xtrac Ripper XXL 2x Corsair AF 140mm quiet edition case fans 
Other
Promilatech PK-1 
AudioAudioAudioOther
**Possibly used** HifiMan HE-500 headphones **USED** Schiit Lyr headphone amp Jolida Glass FX Tube DAC EK Nickel CSQ 680+ Waterblock 
OtherOtherOther
2x Aplhacool NexXxos UT60 360mm full copper rad... 6x Scythe Gentle Typhoon 1450 RPM fans 10 meters of 12mm OD nickel plated copper pipe,... 
CPUMotherboardAudioAudio
4770k Asus Maximus VI Impact Audeze LCD-2 Woo Audio WA3  
Audio
Jolida Tube FX DAC 
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post #5 of 6
The rule is not carried over from X58, the 0.5v rule between VTT and dram voltage.

I run 1v for VCCSA and VTT with my ram @1.65v for a long time now, no problems what so ever.
post #6 of 6
Thread Starter 
Thanks so much guys. I really appreciate your feedback. I feel much better now.
wevs rig
(19 items)
 
  
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i7 3770K Gigabyte GA-Z77X-UD5H MSI GTX 670 PE OC x2 SLi Team xTreem 16Gb (2x4Gb) DDR3 2400Mhz 
Hard DriveHard DriveHard DriveHard Drive
Crucial C300 128Gb x2 RAID0  SK Hynix SH910 128Gb x2 RAID0 Western Digital Black Edition 1Tb Western Digital Black Edition 640Gb 
Optical DriveOptical DriveCoolingOS
Asus DVD / Bluray LG Bluray / Burner Custom H20 - Swiftech, XSPC Windows 7 Pro x64 
MonitorKeyboardPowerCase
Acer P243Waid Razer Black Widow Ultimate Corsair HX1000 Corsair C70 White Edition 
MouseMouse PadAudio
Razer DeathAdder SteelSeries Creative Soundblaster X-FI Titanium HD 
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wevs rig
(19 items)
 
  
CPUMotherboardGraphicsRAM
i7 3770K Gigabyte GA-Z77X-UD5H MSI GTX 670 PE OC x2 SLi Team xTreem 16Gb (2x4Gb) DDR3 2400Mhz 
Hard DriveHard DriveHard DriveHard Drive
Crucial C300 128Gb x2 RAID0  SK Hynix SH910 128Gb x2 RAID0 Western Digital Black Edition 1Tb Western Digital Black Edition 640Gb 
Optical DriveOptical DriveCoolingOS
Asus DVD / Bluray LG Bluray / Burner Custom H20 - Swiftech, XSPC Windows 7 Pro x64 
MonitorKeyboardPowerCase
Acer P243Waid Razer Black Widow Ultimate Corsair HX1000 Corsair C70 White Edition 
MouseMouse PadAudio
Razer DeathAdder SteelSeries Creative Soundblaster X-FI Titanium HD 
  hide details  
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