how to overclock Sempron 3000+ with NF-M2S

[zhong881209]

i have AMD sempron 3000+ (Manila) 1600Mhz (200 x 8.0)
motherboard NF-M2S with GeForce 6100 nforce 405
Stock heatsink
2.5GB DDR2 667

i have no experience in overclock but i wish to do some overclock before buying new computer next years.
i want to know how to overclock both cpu and integrated graphic card, but thing is that, My MB dont have voltage to tune, bios and ntune have different available option to tune.


bios have > Latest Bios
CPU frequency - 200
K8< - >NB HT Speed - auto
K8< - >NB HT Width - auto
PCIE Clock - 100Mhz
weird is i cant find any option to overclock IGC.
CPU Vcore - 1.42V
no voltage control available

CPUz - CPU Voltage 2.320 V

Ntune have >
motherboard >
HTT - 200Mhz
CPU multiplier 8.0x
PCI-E - 2525Mhz
HT Multiplier 4x
voltage control been disable

When i move the HTT my
CPU core frequency - 1600Mhz
HT bus frequency - 800Mhz
Memory bus frequency 666Mhz
all go up

GPU >
Core bus - 425Mhz
Memory bus - 100Mhz


I want to know from your experience in overclock, at least how far can i overclock?
everest cant recogize my CPU type only its CPU frequency.
on the other hand Cpuz can reveal my CPU full information.
everest display my MB, Aux, HDD temp, but CPU temp is incorrect which is forever stay at 25'c
CoreTemp correctly display my CPU temp

I have ntune, CoreTemp, Gpuz, Cpuz, everest Home Edition
anything else i need to have to need to post at forum?

 

[QuietIce]

The only way to over-clock that machine is with the reference clock. The stock reference clock speed is 200 MHz. When you increase the clock speed it will increase everything else; CPU speed, RAM speed, and HT Link speed.

If you speed up the reference clock too much the RAM and HT Link may become unstable and you will need to turn them down (memory to 533 MHz, HT Bus to 600 MHz).

Without being able to increase your CPU voltage (vCore) you may not be able to over-clock very much ...

 

[zhong881209]

thank you for reply. what actually is HT bus frequency?

with reference clock highest setting is from 100 to 250, while now default is 200
but if i drop the HT multiplier to 3x to make HT bus frequency lower, even i have max reference clock also not been able back to its normal 800.

will i suffer performance penalty if my HT bus frequency and memory not been able to return to its value if i lower the HT multiplier?
HT bus frequency i read about not really important, but memory speed is slower then normal, will resulting slower on read and write process?

i notice i cant set reference clock above 240Mhz in ntune, else the computer will restart immediately.
before this, i can temporary increase it to 250Mhz and return it back to default, but why now will crash?

what can i do about PCI-E, available option clock from 100 - 120mhz, while will change it from 2500 - 3000mhz (default is 2525mhz)

 

[QuietIce]

Probably the computer was lowering the RAM and HT bus multiplier automatically before now.


HT bus = HT Link speed = K8< - >NB HT Speed


CPU before 8x 200 = 1600 MHz, now: 8x 240 = 1920 MHz
RAM before 1600/5 = 320 MHz, now: 1920/6 = 320 MHz
HT Link before: 4x 200 = 800, now: 3x 240 = 720 MHz

Doesn't CPU-Z show those changes???




I don't change the PCIe on my machines. Once you have everything else stable you can experiment with the PCIe on your own or ask for further advise in the video section ...

 

[zhong881209]

got, but i dont understand, what is connection DRAM frequency with memory bus frequency?
plus for "RAM before 1600/5 = 320 MHz, now: 1920/6 = 320 MHz"
why before divide 5 then later divide 6?

i thought when i lower the memory, it down to 533, it need higher reference clock to make it back to 667 to have the same data transfer?

 

[QuietIce]

got, but i dont understand, what is connection DRAM frequency with memory bus frequency?

?????

plus for "RAM before 1600/5 = 320 MHz, now: 1920/6 = 320 MHz"
why before divide 5 then later divide 6?

i thought when i lower the memory, it down to 533, it need higher reference clock to make it back to 667 to have the same data transfer?

RAM speed is based off CPU speed, CPU mutliplier, and RAM ratio. It's not directly based off the clock speed. (ceiling function: round up to next whole number)
CPU mutliplier = 8 (before and after)

before: RAM ratio: DDR2-667 = 5/6 = 0.83333
after: RAM ratio: DDR2-533 = 2/3 = 0.66667

before: RAM divider = ceiling ((8/0.83333) /2) = ceiling (9.6/2) = ceiling (4.8) = 5
after: RAM divider = ceiling ((8/0.66667) /2) = ceiling (12/2) = ceiling (6) = 6

RAM frequency = CPU frequency (CPU mutliplier x clock)/RAM divider
before: (8x 200)/5 = 1600/5 = 320 MHz
after: (8x 240)/6 = 1920/6 = 320 MHz

320 MHz = DDR2-640
Same frequency before and after ...


See links for more information:
http://www.ocforums.com/showpost.php?p=5567170&postcount=5
http://www.ocforums.com/showthread.php?t=555058