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Author Topic: General overclocking tips  (Read 11726 times)

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General overclocking tips
« on: 22-February-04, 02:36:35 »

General Overclocking Steps


Overclocking is turning your computer components up faster than they were supposed to run out of the box. So you get more out of what you paid for, and you have a faster computer. There are many computer parts that you can overclock, but the two I will be focusing on in this guide are the CPU (processor) and the memory. To overclock the CPU you will need to overclock the RAM to gain the best system performance that you can. To do this you will be changing a few main settings in your BIOS as well as the Front Side Bus (FSB), the CPU Multiplier, and different voltages.

The FSB is the speed that the memory talks to the northbridge, which then in turn talks to the CPU. The CPU multiplier is a certain number that multiplies the FSB to give it the overall CPU frequency.

Example: 13 (multiplier) x 200 Mhz (FSB) = 2600 Mhz or 2.6 Ghz.

Overclocking, if done to extreme measures or if done with little knowledge of your computer can cause hardware damage that may be irreversible.

This is a possible method to overclock a new CPU.

Step 0
Update your Bios to the newest. Please check the homepage of your mainboard manufacturer for more information.

Step 1
a) PCI locked Motherboard: lock "Fixed AGP/PCI frequency @ 66/33 ".
b) not PCI locked: Use the PCI/AGP divider to regulate the PCI. The PCI bus should not exceed 38Mhz. If it does, you will either suffer from instability problems or you will run the risk of corrupting the data on your hard drive. Ex. If you have a motherboard with a 1/5 PCI/AGP divider you do not want to exceed 190 Mhz FSB since 190/5 = 38 Mhz.

Step 2
Begin to raise the FSB by increments of 5 Mhz and test it with Prime95 and memtest86 until the machine becomes unstable (ex. set Ext. Clock CPU/AGP/PCI to 285). By unstable it creates rounding error in Prime95 or errors in memtest86. When the computer gets to be unstable with a high FSB, back it down slowly (2Mhz at a time) until the computer regains its stability with Prime95 and memtest86.

Or try 2 x SuperPi to the 2M digit and 1 full benchmark of 3DMark2001SE on default settings (CooLJoE - System)

Step 3
Change your DRAM frequency (DRAM Ratio CPURAM): try 3:2 divider first, then 5:4. Set DDR Voltage to 2.60 (DDR SDRAM Voltage: increase only if the system is unstable +0.025 at a time.)

Step 4
Test with Prime95 and 3D Mark 2001 (loop for 45min - 2hrs) if your system is stable. You will know it is unstable when Prime95 encounters a rounding error (or any error of that sort) or if 3DMark2001 dumps you back to the desktop in the middle of a benchmark.

Step 5
To see if you can get more out of the CPU begin to raise the CPU's voltage (CPU Core Voltage), but do not go over 1.70v otherwise you will damage your CPU. Try 1.5250 first, then go up +0.025 at a time.

Step 6
BIOS: Set Performance Mode PAT to "Turbo" or "Ultra"

Step 7
BIOS: Set CPU Config: Hyperthreading Technology to "on"

Step 8
BIOS: Set Chipset: Performance Acceleration Mode to "on" - some BIOS don't have this option.

Step 8
BIOS: Tweak Your RAM

Automatic Configuration (DRAM Auto, Timing Selectable, Timing Configuring)
Options: on/off
--> set OFF

EG: 3 - 8 - 4 - 4

[1]CAS Latency tCL (CAS Latency Time, CAS Timing Delay): 3
[2]RAS-to-CAS Delay tRCD (DRAM RAS# to CAS # Delay, RAS to CAS Delay, Active to CMD): 4
[3]RAS Precharge Time tRP (DRAM RAS# Precharge, RAS Precharge, Precharge to active): 4
[4]Row Active Time tRAS (Act to precharge delay, Active to Precharge Delay, Precharge Wait State, Row Active Delay, Row Precharge Delay): 8

Bank Interleaving (Bank Interleave)
Options: Off/ 2/ 4
--> set 4

Burst Length
Option: 4/ 8
--> set 8

Command Rate CMD (Command Rate, MA 1T/2T Select)
Options: 1/ 2
--> set 1

Step 9
Final test: Check your system with Prime95 and other benchmark programs if your system is stable (for ex. run Prime95 for 4 hours). The temparture of your system should not exceed 55 C °, otherwise you need a better cooling system (ex. SLK-800U, Volcano 7+). IC7 temps tend to be 10-15 degrees higher, so i just subtract 10 from what the windbond hardware doctor shows as your current CPU temperature.

Step 10 Optional
Overclock your graphics card and if you have use Raid 0 or if your harddisk support Serial ATA, activate "On chip serial ATA", "On Chip IDE Device" --> read your manual through.

Settings for maximum overclock: (With PC3200 Ram)
Memory Timings 3-8-4-4
Cpu Voltage 1.65
Memory Voltage: 2.8
Memory Divider: 3/2


Memory Clock
Specifies the clock speed of the memory bus. This rate is normally specified relative to the front-side bus clock. DDR technology (double-data rate) doubles the data rate given by the actual bus clock speed.

Automatic Configuration:
If you want to manually configure your memory timings, you will have to deactivate the automatic RAM configuration.

CAS Latency tCL (CAS Latency Time, CAS Timing Delay):
The number of clock cycles that pass from the column being addressed to the data arriving in the output register. The memory manufacturer lists the best possible setting as the CL rating.

RAS-to-CAS Delay tRCD (RAS to CAS Delay, Active to CMD):
Number of clock cycles that pass between the row address being determined and the column address being sent out. Setting this value to two clock cycles can enhance performance by up to four percent.

RAS Precharge Time tRP (RAS Precharge, Precharge to active):
Number of clock cycles needed to precharge the circuits so that the row address can be determined.

Row Active Time tRAS (Active to Precharge Delay, Precharge Wait State, Row Active Delay, Row Precharge Delay):
Delay that results when two different rows in a memory chip are addressed one after another.

Bank Interleaving:
DDR RAM memory chips are made of four banks. Addressing all four banks through interleaving at the same time will maximize your performance.

Burst Length:
The burst length specifies how many data blocks are sent in one transmission cycle. Ideally, one transmission will fill one memory row on the L2 cache found in modern Pentium 4 and Athlon XP CPUs. That is equal to 64 Bytes, or eight data packets.

Command Rate CMD:
Number of clock cycles needed to address the memory module and the memory chip with the desired data zone. If your memory banks are full to capacity, you will have to raise this rate to two, resulting in a considerable drop in performance.

Memory will hold back FSB, thats why good quality memory costs more.

PC2100 = 133fsb rated (266)
PC2700 = 166fsb rated (333)
PC3200 = 200fsb rated (400)
PC3500 = 217fsb rated (434)
PC3700 = 233fsb rated (466)
PC4000 = 250fsb rated (500)

Also dependant on your motherboard you may or may not get the rated speed.

If you are overclocking, FSB is king

15*133fsb = 1995mhz
10*200fsb = 2000mhz This will be quicker as its moving data across the mobo alot quicker.

As always read up and understand over-clocking before you try it.
Computer Spec's & Benchmarks


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  • If its not overclocked, its not fast enough
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« Reply #1 on: 22-February-04, 03:36:26 »
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    « Reply #2 on: 26-August-04, 03:47:05 »

    How can I know whether my AGP/PCI is locked or unlocked?

    And where can i find my AGP/PCi ratio divider?

    My mobo is MSI MS-6534


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    « Reply #3 on: 26-August-04, 09:54:40 »
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  • ~skyline~

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    • Living in tha fast lane, on one wheel!
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    « Reply #4 on: 20-October-04, 03:09:30 »
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  • well done!  :biggthumbsup:

    Im gonna oc my amd64 when I get it  :-D)
    But it never comes in stock here in sweden  :biggthumbsdown:
    :like: My Gaming Machine!    :like:

    MSI K8N neo2 nforce3 Bios: 1.5
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    « Reply #5 on: 20-October-04, 03:42:15 »
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  • didnt you get my pm skyline ?


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    Re: General overclocking tips
    « Reply #6 on: 08-April-14, 14:02:04 »
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  • Need help On step 3  cant find what you are talking about

    Also DDR Voltage  Mine only goes to 2.40 but it turns red when reaching 200

    Many thanks
    operating system! 764X ultimate 4.4 stable, testing 4.5
    Processor: Intel ® Core i7- 4770K processor
    Gigabyte GeForce GTX 760 OCWF3X,2GBDDR5
    Maximum memory : 32GB / on board 16gb DDR3 1600 Fan: Scythe Katana 3, PSU : Cougar Power 700 W
    Memory clock : 1600 MHz DDR3, CL10 9-9-9-24
    Motherboard: MSI Z87 -G45 GAMING ATX
    Case: Cougar Evolution 6GR1B black
    Software_Z3 : System Software Utilities
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    Re: General overclocking tips
    « Reply #7 on: 08-April-14, 14:29:02 »
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  • Since this was was in 2004 it doesn't have all that much in common with a modern system.
    Make sure to select a "best" answer once your issue has been resolved!
    Mainboard: X79A-GD65 (8D)
    CPU: I7-3930K
    Setting: 4.5Ghz enhanced turbo w/ speed step functioning.
    Memory: Corsair Dominator 2133 CL:9  1.5v 4x4gb
    Setting: 2400 CL:10
    VGA: 2 x GTX 780Ti Gaming 3G (SLI)
    No Overclock other than default
    PSU: Corsair AX1200i 12v: 100.1 Amps
    SSD: Corsair GS 256GB
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