Well,there are many topics based on this type of overk,i'v read some and i can't find my answer.Why I say that?Becouse every overk is different and has it's "unique" part.So,I ask you kindly to offer me an anwer.:) Thanks in advantage!
I have an Athlon Xp 1800+
Memory Kingmax 3*256DDr@400mhz
Mainboard:Gigabyte GA-7VT880-L
Video Card:Saphire R9600Se
Tuner:Asus
Sound:Creative Live 5.1
Atx 450W and 3 sys fans+a BIG fluffy
cpu cooler at 2900to4000Rpm.very big
and stupid i say!:)
Question:how can i overclock the processor?Before i had a mainboard Ecs K7vza and it was perfect.I had my Athlon at 2GHZ!!! and it was stable(53C)!! but i bought my video card that is Agp8x and diden't worked on Ecs..so i had to change the mainboard with this Gigabyte..
Now i can't modify the multiplier in the Bios,i can change the Fsb(default 166) but if i make it @175 it is instable and that is far away from 2Ghz.
Also,can i modify the video card?Bios flash should make an impact?Any sugestions would be very apreciated.
I thank you all very much for your time! take care!

love me!

1800+ at 2000MHz is quite an overclock. I used to run my unlocked 1800+ at 1700MHz (8.5 x 200MHz) w/PC3200 RAM on an nForce2 board.

Have you read your manual? It looks to me like you have plenty of BIOS settings to play with...look under MB Intelligent Tweaker (M.I.T):

- DRAM Timing = Auto By SPD. Use the "manual" setting if you're familiar with RAM timings
- CPU Ratio Control = multiplier, adjust as necessary. NOTE: "This option will not be shown or not be available if you are using a CPU with the locked ratio."
- Spread Spectrum Modulated = disabled
- CPU Host Clock Control = enabling this will save you if you over-overclock
- CPU Host Frequency (MHz) = FSB
- PCI/AGP Frequency (MHz) = lock at 66MHz if possible, otherwise, keep between 66-75MHz
- DRAM Clock (MHz) = should be the same as FSB. Do not use "By SPD". There's no point running RAM at 200MHz (DDR400) if CPU is at 133MHz (266FSB). If the FSB is 133MHz, run the RAM at 133MHz. If the FSB is 166, run the RAM at 166, etc...
- CPU Voltage Control = adjust as necessary to stabilize the overclock

Yes,trust me I did.I have lots of options,but something "hangs up" the overclock,i think it's the video card or the memory.When I overclock i set the memory on manual clock 133mhz and then i make the Fsb at 174--->2000+ and it's stable,if i go further then it's not stable becouse the Voltage on the Pci/Agp is to high.The multiplier can be modified but the procesor stays the same@1594mhz.I think it's blocked hardware..The video card can be overclocked(Core@210mhz,Memory@410mhz---from 200/394) but i can't reach my 2ghz or 1800mhz braketrough.The temperature is not a problem,the problem is reaching that step...
thanks for helping me,hope to help me again :)
take care!

love me!

"something "hangs up" the overclock,i think it's the video card or the memory"

It's neither of those. Since there's no way to lock the PCI/AGP buses at their default speeds of 33/66MHz, the PCI/AGP is what's gonna hold you back. From your BIOS:

"PCI/AGP Frequency (MHz)
The values depend on CPU Host Frequency(Mhz)"

In other words, the PCI/AGP adjusts automatically based on the FSB setting. If you allow it to go above 37.5/75MHz, that is when problems will crop up.

"i make the Fsb at 174--->2000+ and it's stable,if i go further then it's not stable becouse the Voltage on the Pci/Agp is to high"

The AGP voltage doesn't change unless YOU change it! I think you're talking about the PCI/AGP bus speed...like I said, the AGP should be kept with 66-75MHz. If anything, you should increase the CPU voltage to stabilize the overclock...NOT the AGP voltage.

"The multiplier can be modified but the procesor stays the same@1594mhz"

That's a little confusing. The stock speed of the 1800+ is 1533MHz (11.5 x 133), so I don't know where 1594MHz is coming from? It's sounds to me like your multiplier is locked, so you're stuck with 11.5x...you may be able to change the setting in the BIOS, but it will have no effect on the CPU speed.

Bottomline, you chose a crappy motherboard. For overclocking the socket A system, the nForce2 chipset is king! If you want your system to remain stable, you're gonna have to limit your overclock to the capabilities of the new board & forget what you were able to do with your old board.

yes ,you are right in all the ways.
I should consider to upgrade my Pc to something new.Thanks for the help!!!

love me!