Overclock.net › Forums › AMD › AMD CPUs › CPU NB voltage?
New Posts  All Forums:Forum Nav:

CPU NB voltage?

post #1 of 16
Thread Starter 
I still don't understand the difference between NB voltage and CPU NB voltage. I keep my NB voltage at +0.1 (1.2V), what should I do with my CPU NB voltage (1.3V)?

3 Cores of secks
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenerom II 720 BE @ 3.7 GHz Gigabyte GA-MA790X-UD4P Asus 5770 V1 Crossfire [2] @ 950/1300 1.175V Patriot 2x1GB DDR2 6400PC2 @ 1066MHz 4-5-5-15 2.2V 
Hard DriveOSMonitorKeyboard
Western Digital Caviar Black 1TB Windows 7 Ultimate 32 bit Samsung 2443 BW Logitech Deluxe 250 
PowerCaseMouseMouse Pad
Corsair VX550 CM 690 /w side window MX518 My desk 
  hide details  
Reply
3 Cores of secks
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenerom II 720 BE @ 3.7 GHz Gigabyte GA-MA790X-UD4P Asus 5770 V1 Crossfire [2] @ 950/1300 1.175V Patriot 2x1GB DDR2 6400PC2 @ 1066MHz 4-5-5-15 2.2V 
Hard DriveOSMonitorKeyboard
Western Digital Caviar Black 1TB Windows 7 Ultimate 32 bit Samsung 2443 BW Logitech Deluxe 250 
PowerCaseMouseMouse Pad
Corsair VX550 CM 690 /w side window MX518 My desk 
  hide details  
Reply
post #2 of 16
+1 Bart. I have tried different straight NB voltage increase and nothing. I use CPU/NB @1.3 for 2400-2600 on NB. Anything less gives me instability. Have no idea how NB voltage can help.
Edited by jimibgood - 5/25/09 at 1:19pm
Phenom II 955
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 965 Lapped OC'd 4.14GHz (Stable 24/7) Gigabyte GA-MA790XT-UD4P 2 x 1G 4890 Liquid cooled crossfire Corsair XMS DDR3 1600(8G 9/9/9/23/1T) 
Hard DriveOptical DriveOSMonitor
2 x 300G Velocity Raptor(Raid0) WD 500G Barracuda Asus Windows7 64 bit Hanspree 22in 
KeyboardPowerCaseMouse
Logitech Ultra X3 850W Zalman GS1000 Logitech 
  hide details  
Reply
Phenom II 955
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 965 Lapped OC'd 4.14GHz (Stable 24/7) Gigabyte GA-MA790XT-UD4P 2 x 1G 4890 Liquid cooled crossfire Corsair XMS DDR3 1600(8G 9/9/9/23/1T) 
Hard DriveOptical DriveOSMonitor
2 x 300G Velocity Raptor(Raid0) WD 500G Barracuda Asus Windows7 64 bit Hanspree 22in 
KeyboardPowerCaseMouse
Logitech Ultra X3 850W Zalman GS1000 Logitech 
  hide details  
Reply
post #3 of 16
NB VID = Voltage for integrated memory controller, increased when overclocking memory.

NB Voltage = Voltage supplied to the north bridge chipset (790FX/790X/etc.) which controls the PCIE lanes, not usually increased in values.

on AM3 platforms, default values are 1.1v

at DDR3-1600 speed, my NB VID is at 1.375, max safe value afaik is 1.45 (not sure).

hope that helps.
post #4 of 16
Thread Starter 
So I should increase my CPU NB V if I'm pushing my ram to it's limits?

What about my NB voltage? Should I keep it at 1.2V? Doesn't it matter for NB frequency?
3 Cores of secks
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenerom II 720 BE @ 3.7 GHz Gigabyte GA-MA790X-UD4P Asus 5770 V1 Crossfire [2] @ 950/1300 1.175V Patriot 2x1GB DDR2 6400PC2 @ 1066MHz 4-5-5-15 2.2V 
Hard DriveOSMonitorKeyboard
Western Digital Caviar Black 1TB Windows 7 Ultimate 32 bit Samsung 2443 BW Logitech Deluxe 250 
PowerCaseMouseMouse Pad
Corsair VX550 CM 690 /w side window MX518 My desk 
  hide details  
Reply
3 Cores of secks
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenerom II 720 BE @ 3.7 GHz Gigabyte GA-MA790X-UD4P Asus 5770 V1 Crossfire [2] @ 950/1300 1.175V Patriot 2x1GB DDR2 6400PC2 @ 1066MHz 4-5-5-15 2.2V 
Hard DriveOSMonitorKeyboard
Western Digital Caviar Black 1TB Windows 7 Ultimate 32 bit Samsung 2443 BW Logitech Deluxe 250 
PowerCaseMouseMouse Pad
Corsair VX550 CM 690 /w side window MX518 My desk 
  hide details  
Reply
post #5 of 16
This is where I have my 955 with a 24/7 (almost) 3.9... This might help you get an idea.
on AM2+ you can keep the CPU NB multi at 2600 or less, and on AM3 you can get upwards of 2600-2800.
On Processor NB Voltage you can keep this around 1.27-1.30, and I usually had my HT Link at 2400 but here its at 2200. Also with all of these settings pushed like this, look at my temps after running vantage and then a Prime 1hr session. Not bad. Im hitting 47*C full max load. This CPU runs so cool.


Hey though which CPU are you running? and on what board?
I dont see it, and different CPU's handle things differently.

I dont have a screen shot of just my CPU-Z and Im at work, so I had to include my Vantage.



Edited by -Muggz- - 5/25/09 at 4:49pm
    
CPUMotherboardGraphicsRAM
Phenom II 955 @3.9 1.456v ASUS M3A79-T Deluxe v0902 2x Sapphire 4870 1GB 810/970 4GB GSkill Pi Black 
Hard DriveOptical DriveOSMonitor
2x 74GB Raptor 16mb/WD Caviar Black 640GB 32mb Sony 20x DVD multi Windows 7 x64 24" Dell Gloss Black 
KeyboardPowerCaseMouse
Razer Lycosa Mirror Antec Quattro 850w HAF 932 Razer Copperhead 
Mouse Pad
Razer Exact Mat 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Phenom II 955 @3.9 1.456v ASUS M3A79-T Deluxe v0902 2x Sapphire 4870 1GB 810/970 4GB GSkill Pi Black 
Hard DriveOptical DriveOSMonitor
2x 74GB Raptor 16mb/WD Caviar Black 640GB 32mb Sony 20x DVD multi Windows 7 x64 24" Dell Gloss Black 
KeyboardPowerCaseMouse
Razer Lycosa Mirror Antec Quattro 850w HAF 932 Razer Copperhead 
Mouse Pad
Razer Exact Mat 
  hide details  
Reply
post #6 of 16
Quote:
Originally Posted by Bartmasta View Post
So I should increase my CPU NB V if I'm pushing my ram to it's limits?

What about my NB voltage? Should I keep it at 1.2V? Doesn't it matter for NB frequency?
for overclocking memory, yes you need to increase your CPU NB V if your overclock fails because of insufficient voltages supplies to the sdrams.

when you increase the base clock/bus speed (normally 200 MHz), this also increases the HT Link speed (or your NB frequency, as you call it). if you keep it at its default clocks by lowering the HT multiplier while increasing your base clock/bus speed, you shouldn't have to increase the NB voltage. keeping HT Link/NB frequency/voltages at default also keeps your NB chipset cooler.

**edit: for overclocking memory, yes you need to increase your CPU NB V if your overclock fails because of insufficient voltages supplied to the CPU integrated memory controller.

** sorry.
Edited by wuttz - 5/25/09 at 11:59pm
post #7 of 16
I believe the CPU -> NB voltage is for your HTT speed.

Please correct me if I'm wrong.
six|speed
(14 items)
 
five|speed
(14 items)
 
automatic.
(13 items)
 
CPUMotherboardGraphicsRAM
i5 760 | 4GHz | 1.275v Gigabyte P55A-UD3 MSI NX7600GT  8GB G.Skill ECO 
Hard DriveOptical DriveCoolingOS
1TB Samsung Spinpoint F3 LG 22X DVD±R Corsair H50 OSX 10.7.3 
MonitorPowerCaseMouse
LG 23" Corsair HX620 Antec Nine-Hundred MX 518 
Mouse Pad
Thermaltake 
CPUMotherboardGraphicsRAM
X3 710 CACZC | 3.7GHz DFI LP DK 790GX-M2RS ATI Radeon HD 3300 4GB OCZ XTC @ 800MHz 2.08v 
Hard DriveOptical DriveCoolingOS
Western Digital 6400AAKS LG 22X DVD±R Xigmatek S1283 7 Professional 64-Bit 
MonitorKeyboardPowerCase
20" Acer AL2017 Logitech Media Corsair CX430 Thermaltake Soprano 
Mouse
Logitech G5 
CPUMotherboardGraphicsRAM
AMD X2 3600+ Asus M2N32 SLI Deluxe XFX HD 6750 4GB G.Skill HK 
Hard DriveOptical DriveOSMonitor
1TB Samsung F3 Samsung SATA 52x CD/DVD-RW 7 Professional 64-Bit 19" Acer AL1914 
KeyboardPowerCaseMouse
Logitech Media Antec TruePower Trio 550 Thermaltake Soprano Logitech G5 
  hide details  
Reply
six|speed
(14 items)
 
five|speed
(14 items)
 
automatic.
(13 items)
 
CPUMotherboardGraphicsRAM
i5 760 | 4GHz | 1.275v Gigabyte P55A-UD3 MSI NX7600GT  8GB G.Skill ECO 
Hard DriveOptical DriveCoolingOS
1TB Samsung Spinpoint F3 LG 22X DVD±R Corsair H50 OSX 10.7.3 
MonitorPowerCaseMouse
LG 23" Corsair HX620 Antec Nine-Hundred MX 518 
Mouse Pad
Thermaltake 
CPUMotherboardGraphicsRAM
X3 710 CACZC | 3.7GHz DFI LP DK 790GX-M2RS ATI Radeon HD 3300 4GB OCZ XTC @ 800MHz 2.08v 
Hard DriveOptical DriveCoolingOS
Western Digital 6400AAKS LG 22X DVD±R Xigmatek S1283 7 Professional 64-Bit 
MonitorKeyboardPowerCase
20" Acer AL2017 Logitech Media Corsair CX430 Thermaltake Soprano 
Mouse
Logitech G5 
CPUMotherboardGraphicsRAM
AMD X2 3600+ Asus M2N32 SLI Deluxe XFX HD 6750 4GB G.Skill HK 
Hard DriveOptical DriveOSMonitor
1TB Samsung F3 Samsung SATA 52x CD/DVD-RW 7 Professional 64-Bit 19" Acer AL1914 
KeyboardPowerCaseMouse
Logitech Media Antec TruePower Trio 550 Thermaltake Soprano Logitech G5 
  hide details  
Reply
post #8 of 16
shift, i myself am not 100% sure because of lack of documentation for AOD. but here is how i understand it, pls. correct if its wrong. ty.
post #9 of 16
Thread Starter 
Quote:
Originally Posted by -Muggz- View Post
This is where I have my 955 with a 24/7 (almost) 3.9... This might help you get an idea.
on AM2+ you can keep the CPU NB multi at 2600 or less, and on AM3 you can get upwards of 2600-2800.
On Processor NB Voltage you can keep this around 1.27-1.30, and I usually had my HT Link at 2400 but here its at 2200. Also with all of these settings pushed like this, look at my temps after running vantage and then a Prime 1hr session. Not bad. Im hitting 47*C full max load. This CPU runs so cool.


Hey though which CPU are you running? and on what board?
I dont see it, and different CPU's handle things differently.

I dont have a screen shot of just my CPU-Z and Im at work, so I had to include my Vantage.

looks good man, thanks for the reply

Why is your CPU NB voltage so low though? Isn't it 1.3V stock? I've got mine at 1.325V.

I'm using the 720 BE on a GA-MA78G-DS3H motherboard

3 Cores of secks
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenerom II 720 BE @ 3.7 GHz Gigabyte GA-MA790X-UD4P Asus 5770 V1 Crossfire [2] @ 950/1300 1.175V Patriot 2x1GB DDR2 6400PC2 @ 1066MHz 4-5-5-15 2.2V 
Hard DriveOSMonitorKeyboard
Western Digital Caviar Black 1TB Windows 7 Ultimate 32 bit Samsung 2443 BW Logitech Deluxe 250 
PowerCaseMouseMouse Pad
Corsair VX550 CM 690 /w side window MX518 My desk 
  hide details  
Reply
3 Cores of secks
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenerom II 720 BE @ 3.7 GHz Gigabyte GA-MA790X-UD4P Asus 5770 V1 Crossfire [2] @ 950/1300 1.175V Patriot 2x1GB DDR2 6400PC2 @ 1066MHz 4-5-5-15 2.2V 
Hard DriveOSMonitorKeyboard
Western Digital Caviar Black 1TB Windows 7 Ultimate 32 bit Samsung 2443 BW Logitech Deluxe 250 
PowerCaseMouseMouse Pad
Corsair VX550 CM 690 /w side window MX518 My desk 
  hide details  
Reply
post #10 of 16
I think 1.2V is stock.
Phenom II 955
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 965 Lapped OC'd 4.14GHz (Stable 24/7) Gigabyte GA-MA790XT-UD4P 2 x 1G 4890 Liquid cooled crossfire Corsair XMS DDR3 1600(8G 9/9/9/23/1T) 
Hard DriveOptical DriveOSMonitor
2 x 300G Velocity Raptor(Raid0) WD 500G Barracuda Asus Windows7 64 bit Hanspree 22in 
KeyboardPowerCaseMouse
Logitech Ultra X3 850W Zalman GS1000 Logitech 
  hide details  
Reply
Phenom II 955
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 965 Lapped OC'd 4.14GHz (Stable 24/7) Gigabyte GA-MA790XT-UD4P 2 x 1G 4890 Liquid cooled crossfire Corsair XMS DDR3 1600(8G 9/9/9/23/1T) 
Hard DriveOptical DriveOSMonitor
2 x 300G Velocity Raptor(Raid0) WD 500G Barracuda Asus Windows7 64 bit Hanspree 22in 
KeyboardPowerCaseMouse
Logitech Ultra X3 850W Zalman GS1000 Logitech 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD CPUs
Overclock.net › Forums › AMD › AMD CPUs › CPU NB voltage?