dunoe y i already put my voltage to 1.280 and i still can't get over 260 x 9.5. only run stable now at 255 x 9.5. do i still need to add more voltage?
using Biostar TF7050-M2 , PC5200 DDR2 667 2x1GB

What are your temps?

Monitor your temps, increasing voltage increases temps, if you're having to ask this question, you probably don't need to be OCing in the first place!!! But its your money.

i am using stock cooler for time being, will try chnage to a better cooler... using kingston 667 1gb x2 pc5300

What's your HT multiplier at? Default should be 5, but 5x255=1275"FSB"...way too high. 4x255=1020...pretty-much near the limit. Generally, you don't want the "FSB" going much over 1000MT/s(MHz), and ~1050< seems to be tops for all but the luckiest. Therefore a multi of 3x255=765...a little low, but will be stable, and not hurt performance. GL

The RAM speed won't hurt your overclock, it'll just hamper your performance some.

so do i need to modify any ram setting in my bios?

Here is a good guide for OC AMD K8 CPUs
Read it all!
any questions after that, then ask away ;p

http://www.xbitlabs.com/articles/c [...] guide.html

EDIT: i didnt put the link in ;p Duh

like wat u mention abt the link there is something i quite dun understand abt this http://www.xbitlabs.com/images/cpu/oc-guide/p7.jpg --> is there any further guide on this? and oso at the overclocking software, may i noe y my overclocking software provided along with my tf7050-m2 mobo seems locked for me, looks impossible for me to adjust the fsb frequency. even i use third party software like clockgen, there is no option such as PLL setup for me to adjust the cpu speed... please advise

http://www.diy-street.com/forum/showthread.php?t=28049
Here is a very detailed guide/explantion for dfi boards in particular. that picture shows all your memory timings, part of the reason you are hitting a wall with your OC is because your timings are too tight for the speed you are trying to run your RAM at, the guide tells you how to adjust your CPU/FSB ratio, by adjusting that you will take stress off the RAM and hopefully progress your OC.

how abt software wise? like clockgen, how do i make it work with my mobo? bcoz the PLL setup not appearing

ohh i think i somehow figure out abt the clockgen as my mobo does not support clockgen, anyway manage to push to 2.6ghz at DEFAULT vcore(275x9.5) HT x3 but once after push to 280 x9.5 it start to fail to boot into windows...

So, what was HT multi at before? Did that help?

i all the way using HT x3 now i clock mu cpu at 276 running at DDR2 533 default vcore but after change to 277, the bios showing me Warning!!! switching to safe-mode. Please re-setting the cpu frequency. Need advise to push further... PLZ!!!

Okay, i was wrong....with that divider, it is quite likely that it is your RAM. You're running DDR2-667@~750MHz and 4-4-4-12(suprised you got that high). Is there a lower-speed mem. divider that you can use? If not, then loosening the timings to 5-5-5-15 might get you a few more MHz out of it. GL

lower mem. divider? hmm i not sure whether the mem. divider you r toking abt is "Memory clock value or Limit" currently i am using ddr 533 so u r asking me to lower to ddr 400?

Yeah....you have 4 options:

1.Drop to the 400MHz strap...which will hurt performance(tighten timings as much as you can to offset the low speed).

2.Get new RAM....DDR2-800...not cheap.

3.Up the vDIMM(DDR Voltage in your BIOS)...and soldier on.

4.Loosen the timings more, and hope to get a few more MHz out of your current RAM.

GL