Overclock.net › Forums › AMD › AMD CPUs › amd OC vs intel OC
New Posts  All Forums:Forum Nav:

amd OC vs intel OC

post #1 of 8
Thread Starter 
hey, generally i can somewhat over clock an intel cpu,

but i dont really know how to start overclocking an amd cpu.

i have a amd cpu socket 939 athlon 3400+ cpu and a msi k8n neo platnium board.


generally u start on intel by increasing the fsb then upping the voltage, trying to get it to a fsb to ram ratio of 1:1.

but what do you do on an amd cpu. i heard it was different. amd has hypertransport so they said i dont have to worry about something, and it would be alot easier??

where do i start?
liger-zero
(13 items)
 
  
CPUMotherboardGraphicsRAM
930/920/920/2500k/2500k/x4-640/x4-630/ x58Pro/x58Ext/P6TD/P8P67/P35/A780L/785GM-E51/H55M 5870CFX/GTX260Sli/5870/GTX260-Sli/GTX260/9600/8800 Gskill/Gskill/Gskill/Gskill/Corsair/Corsair/GSkill 
Hard DriveOptical DriveOSMonitor
OWC 6G Extreme PRO / Crucial M4 SAMSUNG DVD-RW DL X64 Win 7 | X86 xp pro | OSX | Ubuntu | Backtrack Samsung 23 x 5 
KeyboardPowerCase
Saitek 850TX/MXS600/750TX/750TX/EA500/EA500/EA500/MxS500 700d + Rackmount server chassis 
  hide details  
Reply
liger-zero
(13 items)
 
  
CPUMotherboardGraphicsRAM
930/920/920/2500k/2500k/x4-640/x4-630/ x58Pro/x58Ext/P6TD/P8P67/P35/A780L/785GM-E51/H55M 5870CFX/GTX260Sli/5870/GTX260-Sli/GTX260/9600/8800 Gskill/Gskill/Gskill/Gskill/Corsair/Corsair/GSkill 
Hard DriveOptical DriveOSMonitor
OWC 6G Extreme PRO / Crucial M4 SAMSUNG DVD-RW DL X64 Win 7 | X86 xp pro | OSX | Ubuntu | Backtrack Samsung 23 x 5 
KeyboardPowerCase
Saitek 850TX/MXS600/750TX/750TX/EA500/EA500/EA500/MxS500 700d + Rackmount server chassis 
  hide details  
Reply
post #2 of 8
The HT needs to be kept in check.
Default 5x200=1000
Generally, 1080 will near the max stable speed, so...
Drop to 4x up to a CPU OC of 260 and 3x above that.
Your MB BIOS may represent those multiplyers as ...
5x = 1000
4x = 800
3x = 600

As the CPU OC increases the base RAM speed may not keep up and you will likely have to utilize a divider or reduce the default speed.
If it's default is DDR400, drop to DDR333 which generally is an 83% reduction. Also, the RAM will then only increase at that % relavant to the CPU increase.... or for every 1MHZ the CPU is OCed, the RAM will increase approx. .83MHz. It's not exact and dependant on the multiplyer used by the CPU. Also, any .5 multiplyers will effect the CPU but not the RAM since the RAMs memory controler only uses whole integers.
    
CPUMotherboardGraphicsRAM
X4 965 ASUS M4A79 Deluxe 9800GTx2 2x2G OCZ Reapers 
Hard DriveOptical DriveOSMonitor
500G WD Black LiteOn CD/DVD R/W Win7 64 22'' ws Acer AL2223W 
KeyboardPowerMouse
MS KU462 Natural SS DA750 MS 5 button 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
X4 965 ASUS M4A79 Deluxe 9800GTx2 2x2G OCZ Reapers 
Hard DriveOptical DriveOSMonitor
500G WD Black LiteOn CD/DVD R/W Win7 64 22'' ws Acer AL2223W 
KeyboardPowerMouse
MS KU462 Natural SS DA750 MS 5 button 
  hide details  
Reply
post #3 of 8
Thread Starter 
ok keeping HT in check means watching so it stays stable and usually not to pass 1080?

im confused about the second part. i understand the drop the multiplier from 5x to 4x for a cpu over clock of up to 260. and drop to multiplier 3x for antyhing over that. but when i drop to 3x from 4x * 260 > 3x * 261? should i just increase from 3x * 270 or something.

and what does it mean to utilize a divider?
liger-zero
(13 items)
 
  
CPUMotherboardGraphicsRAM
930/920/920/2500k/2500k/x4-640/x4-630/ x58Pro/x58Ext/P6TD/P8P67/P35/A780L/785GM-E51/H55M 5870CFX/GTX260Sli/5870/GTX260-Sli/GTX260/9600/8800 Gskill/Gskill/Gskill/Gskill/Corsair/Corsair/GSkill 
Hard DriveOptical DriveOSMonitor
OWC 6G Extreme PRO / Crucial M4 SAMSUNG DVD-RW DL X64 Win 7 | X86 xp pro | OSX | Ubuntu | Backtrack Samsung 23 x 5 
KeyboardPowerCase
Saitek 850TX/MXS600/750TX/750TX/EA500/EA500/EA500/MxS500 700d + Rackmount server chassis 
  hide details  
Reply
liger-zero
(13 items)
 
  
CPUMotherboardGraphicsRAM
930/920/920/2500k/2500k/x4-640/x4-630/ x58Pro/x58Ext/P6TD/P8P67/P35/A780L/785GM-E51/H55M 5870CFX/GTX260Sli/5870/GTX260-Sli/GTX260/9600/8800 Gskill/Gskill/Gskill/Gskill/Corsair/Corsair/GSkill 
Hard DriveOptical DriveOSMonitor
OWC 6G Extreme PRO / Crucial M4 SAMSUNG DVD-RW DL X64 Win 7 | X86 xp pro | OSX | Ubuntu | Backtrack Samsung 23 x 5 
KeyboardPowerCase
Saitek 850TX/MXS600/750TX/750TX/EA500/EA500/EA500/MxS500 700d + Rackmount server chassis 
  hide details  
Reply
post #4 of 8
The divider...
To utilize or use it. It may be necessary as the CPU OC which directally effects the RAM can and will push the RAMs default speed up to a point of instability. So by using a "divider" you underclock the RAM so it can run at a stable speed.

General example
CPU is now @ 250
The effects are...
1. The RAMs HT would be 1250 if you used a default HT multiplyer of 5, so reduce the multiplyer to 4x gives you 4x250=1000
2. If you have the RAM set to DDR400 or 200MHz it now is also being set to run at 250MHz like the CPU. If the RAM can run that high and stable thats great But if it cant, the divider will underclock it. By setting it to DDR333 (or 166MHz) gernerally its now 250x.83=207. THe 207 in the answer is not exact, it can change somewhat depending on the CPUs multiplyer... there is a chart in here somewhere showing you all the factors. I'll see if I can find it.

The Chart by Oskar Wu
http://oskarwu.myweb.hinet.net/A64Divider.jpg
    
CPUMotherboardGraphicsRAM
X4 965 ASUS M4A79 Deluxe 9800GTx2 2x2G OCZ Reapers 
Hard DriveOptical DriveOSMonitor
500G WD Black LiteOn CD/DVD R/W Win7 64 22'' ws Acer AL2223W 
KeyboardPowerMouse
MS KU462 Natural SS DA750 MS 5 button 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
X4 965 ASUS M4A79 Deluxe 9800GTx2 2x2G OCZ Reapers 
Hard DriveOptical DriveOSMonitor
500G WD Black LiteOn CD/DVD R/W Win7 64 22'' ws Acer AL2223W 
KeyboardPowerMouse
MS KU462 Natural SS DA750 MS 5 button 
  hide details  
Reply
post #5 of 8
Thread Starter 
oh, okay. so it is alot easier to overclock an AMD than it is an intel
liger-zero
(13 items)
 
  
CPUMotherboardGraphicsRAM
930/920/920/2500k/2500k/x4-640/x4-630/ x58Pro/x58Ext/P6TD/P8P67/P35/A780L/785GM-E51/H55M 5870CFX/GTX260Sli/5870/GTX260-Sli/GTX260/9600/8800 Gskill/Gskill/Gskill/Gskill/Corsair/Corsair/GSkill 
Hard DriveOptical DriveOSMonitor
OWC 6G Extreme PRO / Crucial M4 SAMSUNG DVD-RW DL X64 Win 7 | X86 xp pro | OSX | Ubuntu | Backtrack Samsung 23 x 5 
KeyboardPowerCase
Saitek 850TX/MXS600/750TX/750TX/EA500/EA500/EA500/MxS500 700d + Rackmount server chassis 
  hide details  
Reply
liger-zero
(13 items)
 
  
CPUMotherboardGraphicsRAM
930/920/920/2500k/2500k/x4-640/x4-630/ x58Pro/x58Ext/P6TD/P8P67/P35/A780L/785GM-E51/H55M 5870CFX/GTX260Sli/5870/GTX260-Sli/GTX260/9600/8800 Gskill/Gskill/Gskill/Gskill/Corsair/Corsair/GSkill 
Hard DriveOptical DriveOSMonitor
OWC 6G Extreme PRO / Crucial M4 SAMSUNG DVD-RW DL X64 Win 7 | X86 xp pro | OSX | Ubuntu | Backtrack Samsung 23 x 5 
KeyboardPowerCase
Saitek 850TX/MXS600/750TX/750TX/EA500/EA500/EA500/MxS500 700d + Rackmount server chassis 
  hide details  
Reply
post #6 of 8
nono. The E6600 is MUCH better overclock than any amd cpu's ever! It can do 3.8Ghz stable on air! and the stock is 2.4!
The PiMpMaChInE
(13 items)
 
  
CPUMotherboardGraphicsRAM
x64 4200+ Gigabyte GA-M57SLI-S4 Club3D 8800GTS, Gainward 8800GTS Corsair PC6400 4GB 
Hard DriveOSMonitorKeyboard
Samsung 250GB Windows Vista 64bit Packard Bell 19" Wide Logitech G15 
PowerCaseMouseMouse Pad
Hiper Type-R 580W Antec 300 Logitech MX518 Steelpad QcK Heavy 
  hide details  
Reply
The PiMpMaChInE
(13 items)
 
  
CPUMotherboardGraphicsRAM
x64 4200+ Gigabyte GA-M57SLI-S4 Club3D 8800GTS, Gainward 8800GTS Corsair PC6400 4GB 
Hard DriveOSMonitorKeyboard
Samsung 250GB Windows Vista 64bit Packard Bell 19" Wide Logitech G15 
PowerCaseMouseMouse Pad
Hiper Type-R 580W Antec 300 Logitech MX518 Steelpad QcK Heavy 
  hide details  
Reply
post #7 of 8
Raptor Raper
(13 items)
 
  
CPUMotherboardGraphicsRAM
Something with transistors FOXCONN Boodrage -> eVGA classified e760 GTX 480 / HD6850@1090/1200 3x2 gig G Skill Trident DDR2000 
Hard DriveOptical DriveOSMonitor
2x128GB Crucial C300 Sumsung SATA DVD-RW 64 bit Windows 7 Samsung 245BW 
KeyboardPowerCaseMouse
Microsoft curve Tagan ITZ 800W DD Torture Rack Diamondback 
  hide details  
Reply
Raptor Raper
(13 items)
 
  
CPUMotherboardGraphicsRAM
Something with transistors FOXCONN Boodrage -> eVGA classified e760 GTX 480 / HD6850@1090/1200 3x2 gig G Skill Trident DDR2000 
Hard DriveOptical DriveOSMonitor
2x128GB Crucial C300 Sumsung SATA DVD-RW 64 bit Windows 7 Samsung 245BW 
KeyboardPowerCaseMouse
Microsoft curve Tagan ITZ 800W DD Torture Rack Diamondback 
  hide details  
Reply
post #8 of 8
From what I've heard from those who do both the Intel is easier and less complicated.
AMDs on chip memory controler is why all the above is necessary.
Don't ask me about Intel OCing, don't own them don't want them, don't like them.
    
CPUMotherboardGraphicsRAM
X4 965 ASUS M4A79 Deluxe 9800GTx2 2x2G OCZ Reapers 
Hard DriveOptical DriveOSMonitor
500G WD Black LiteOn CD/DVD R/W Win7 64 22'' ws Acer AL2223W 
KeyboardPowerMouse
MS KU462 Natural SS DA750 MS 5 button 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
X4 965 ASUS M4A79 Deluxe 9800GTx2 2x2G OCZ Reapers 
Hard DriveOptical DriveOSMonitor
500G WD Black LiteOn CD/DVD R/W Win7 64 22'' ws Acer AL2223W 
KeyboardPowerMouse
MS KU462 Natural SS DA750 MS 5 button 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD CPUs
Overclock.net › Forums › AMD › AMD CPUs › amd OC vs intel OC