I know I wrote the basics on overclocking, and usually people ask me what to do... but I am clueless as to why I can't reach 2.2GHz.
I currently have an AMD Athlon XP2500+ Barton (1.83GHz default with a multiplier of 11.0x). I have achieved more than 2.2GHz core before, but that was a mixture of changing the multiplier and FSB - because I only had DDR333 memory that did not like being overclocked.
Recently I invested in a nice set of 2x 512MB Elixir DDR400 CL 3.0-3-3-6 memory. I have read reviews on overclocking a XP2500+ by simply increasing the FSB from default 166MHz to 200MHz... not even touching the voltage (at 1.650V default).
Currently I have only been able to get as high as 191MHz FSB (~2.1GHz) and any higher I get artifacts, I have tried increasing the voltage to 1.675V and 1.700V but with no difference. My CPU temperature under load is only 47 degrees celsius and 33 degrees celsius system temperature.
The artifacts are severe lines on 3D Marks 2001SE on "Nature". At 190MHz FSB I see no artifacts.
FSB Spread is [Disabled].
Any ideas anyone? As I am out of them.
My system is;
ThermalTake Xaser II Aluminium Case,
AMD Athlon XP2500+ with Coolermaster Jet-7 cooling,
1024MB (2x 512MB) (DDR400) Elixir Dual Channel memory (3.0-3-3-6),
MSI K7N2-L Motherboad with nForce2 chipset,
128MB MSI GeForce4 Ti4200 (AGPx4) <- I know its old
Windows XP Professional (SP2)
Get around 12k+ on 3D Marks 2001SE
And more than 17k on Aquamark 3