Overclock.net › Forums › AMD › AMD CPUs › AMD CPU Overclock, RAM overlcock HELP PLEASE
New Posts  All Forums:Forum Nav:

AMD CPU Overclock, RAM overlcock HELP PLEASE - Page 2

post #11 of 14
Thread Starter 
Ok so last night I overclocked my 965 BE CPU to 3.8ghz and upped the voltage to 1.5v. I also changed my RAM from 667mhz to 800mhz in the bios, bringing it up to 1600mhz. After changing the timings from 9-9-9-24 to 8-8-8-24 and T1, I ran a few stress tests which bombed out after about 10 mins. I then changed it to T2, but had the same results. Eventually, I changed my RAM back to 9-9-9-24 timings but upped the voltage slightly. I then ran Prime95 for 4 hours and no problems.

So I finally managed my first stable overclock of 3.8ghz and RAM running faster at 1600mhz.

At the moment I am trying a 3.9ghz stress test, so far so good.

I still want to know why on earth I would change the NB on the CPU??? Is that only when overclocking via FSB?

Thanks for all the help.
post #12 of 14
read these, very good OC'ing guides.

AMD Phenom II Overclock Guide (3 step)
http://www.overclockers.com/step-guide-overclock-amd-phenom/

AMD Phenom II Overclock Guide (Gappos)
http://www.overclock.net/amd-general/777378-official-gappos-little-deneb-thuban-overclocking.html

multiplier OC'ing is the easiest form as it only increases the CPU frequency.
FSB or HTT OC'ing affects every subsystem clocks: the RAM, CPU/NB, HT (hypertransport bus) and the CPU frequency. you usually only touch the FSB/HTT last to squeeze the last bit of performance from your CPU/system. things would be a lot simpler if the CPU clock & the CPU/NB ran synchronously.

the CPU/NB is a bit confusing with AMD systems, it's really the on die 'Integrated Memory Controller' (IMC). the actual NB (northbridge) is the off die chip on your motherboard responsible for the PCIe lanes mostly. the SB is for pretty much everything else (SATA, USB, sound, LAN etc)

back to the CPU/NB or the IMC, increasing this (stabily) offers a pretty big performance gains for the memory subsystem. 2000MHz is stock for PII's (denebs & thubans). most PII's should do 2400-2600 without touching the CPU/NB volts a lot. 3000MHz is doable tho not much point till your CPU is around in 4GHz territory.

rule with OC'ing only make 1 change at a time then stress test. don't worry about the CPU/NB (leave at stock) till you've maxed your CPU clock. once you've got that locked in, then start tweaking the CPU/NB (via the dividers or FSB/HTT OC'ing).
    
CPUMotherboardGraphicsRAM
X6 1100T Asus Crosshair V Sapphire 7970 Ref G.Skill 16GB (4x4) DDR3 1866 
Hard DriveHard DriveHard DriveCooling
Samsung 830 256GB WD vRaptor 300GB WD Black 2TB Custom Water Cooling 
CoolingCoolingCoolingCooling
XSPC Bayres XSPC Raystorm EK FB-CHV EK 7970 
CoolingCoolingCoolingCooling
Swiftech 655 Swiftech QP 360 Radiator Swiftech QPRes 240 Swiftech QPRes 240 
CoolingOSMonitorPower
Magicool Slim 240 Windows 7 x64 Samsung 30' 305t Plus Seasonic Platinum 
Case
Custom Lian Li Dual PC-60 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
X6 1100T Asus Crosshair V Sapphire 7970 Ref G.Skill 16GB (4x4) DDR3 1866 
Hard DriveHard DriveHard DriveCooling
Samsung 830 256GB WD vRaptor 300GB WD Black 2TB Custom Water Cooling 
CoolingCoolingCoolingCooling
XSPC Bayres XSPC Raystorm EK FB-CHV EK 7970 
CoolingCoolingCoolingCooling
Swiftech 655 Swiftech QP 360 Radiator Swiftech QPRes 240 Swiftech QPRes 240 
CoolingOSMonitorPower
Magicool Slim 240 Windows 7 x64 Samsung 30' 305t Plus Seasonic Platinum 
Case
Custom Lian Li Dual PC-60 
  hide details  
Reply
post #13 of 14
Quote:
Originally Posted by Morbidlight View Post

Ok so last night I overclocked my 965 BE CPU to 3.8ghz and upped the voltage to 1.5v. I also changed my RAM from 667mhz to 800mhz in the bios, bringing it up to 1600mhz. After changing the timings from 9-9-9-24 to 8-8-8-24 and T1, I ran a few stress tests which bombed out after about 10 mins. I then changed it to T2, but had the same results. Eventually, I changed my RAM back to 9-9-9-24 timings but upped the voltage slightly. I then ran Prime95 for 4 hours and no problems.
So I finally managed my first stable overclock of 3.8ghz and RAM running faster at 1600mhz.
At the moment I am trying a 3.9ghz stress test, so far so good.
I still want to know why on earth I would change the NB on the CPU??? Is that only when overclocking via FSB?
Thanks for all the help.
1.5V is very, very high lol

Start at Default voltage and keep upping the multi and VCore as you go.
Start at sat 34X 3.4Ghz @ 1.35V then try 35x at 1.36V if it doesn't boot try 1.37V and so forth.
post #14 of 14
The CPU/NB is the integrated memory controller,or IMC.Increasing the default speed on AMD Phenom CPU's results in increased performance across the board.It is directly tied to your memory,so in some cases to overclock your RAM you may need to increase your CPU/NB voltage.The rec. safe voltage for your CPU/NB is around 1.45.The rec. safe voltage for the CPU(vcore) is around 1.55v.A decent Phenom II(C3 revision) should hit 4.0GHz with around 1.4 to 1.45v. For best performance you want your CPU/NB around 2800MHz,stock is 2000MHz.Most Phenom II's will do 2800MHz on the CPU/NB with around 1.35 to 1.4v. Read the guides. thumb.gif
Amelia
(13 items)
 
Professional
(13 items)
 
RCPC#1
(17 items)
 
CPUMotherboardGraphicsRAM
Phenom II X6 1100t MSI 890FX GD65 MSI Radeon HD5670 GSkill RipjawsX DDR3 PC3 12800 2x4GB CL8 
Hard DriveOptical DriveCoolingOS
WD Black 1TB SATA III Samsung BD Zalman 9900MAX Windows 7 64 Professional 
MonitorKeyboardPowerCase
AOC 22" LED Logitech Kingwin Lazer Platinum 500w Fractal Design R3 
Other
Samsung 470 SSD 128GB 
CPUMotherboardGraphicsRAM
AMD Phenom II X6 960T Asus M4A88T-VEVO Asus Strix R7 370 SuperTalent Perfomance 
RAMHard DriveHard DriveOptical Drive
GSkill Snipers Monster Daytona Seagate Barracuda 500GB 7,200 RPM 16Mb cache Memorex DVD/RW 
CoolingOSMonitorKeyboard
Corsair H60 Windows 8N IBM 9494 19" LCD IBM 
PowerCaseMouseMouse Pad
Corsair GS500 In Win H-Frame Wolfking OCZ Behemoth 
Audio
JBL Creature 
  hide details  
Reply
Amelia
(13 items)
 
Professional
(13 items)
 
RCPC#1
(17 items)
 
CPUMotherboardGraphicsRAM
Phenom II X6 1100t MSI 890FX GD65 MSI Radeon HD5670 GSkill RipjawsX DDR3 PC3 12800 2x4GB CL8 
Hard DriveOptical DriveCoolingOS
WD Black 1TB SATA III Samsung BD Zalman 9900MAX Windows 7 64 Professional 
MonitorKeyboardPowerCase
AOC 22" LED Logitech Kingwin Lazer Platinum 500w Fractal Design R3 
Other
Samsung 470 SSD 128GB 
CPUMotherboardGraphicsRAM
AMD Phenom II X6 960T Asus M4A88T-VEVO Asus Strix R7 370 SuperTalent Perfomance 
RAMHard DriveHard DriveOptical Drive
GSkill Snipers Monster Daytona Seagate Barracuda 500GB 7,200 RPM 16Mb cache Memorex DVD/RW 
CoolingOSMonitorKeyboard
Corsair H60 Windows 8N IBM 9494 19" LCD IBM 
PowerCaseMouseMouse Pad
Corsair GS500 In Win H-Frame Wolfking OCZ Behemoth 
Audio
JBL Creature 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD CPUs
Overclock.net › Forums › AMD › AMD CPUs › AMD CPU Overclock, RAM overlcock HELP PLEASE