I can overclock my amd cpu from 1800+ > 2200+ at 133mhz, but i can't go further to 166mhz which is to 2800+. Every time i set 166mhz bus frequence and it runs normal when i turn on computer and that display its 2800+, then loading the window xp startup screen and suddenly the blue screen has shown on my monitor and its said somthing error... i don't know what the problem is...can anyone tell me? System Specification XFXFORCE NF24-ALH Motherboard AMD Athlon XP 1800+ (Currently using 2200+) RAM 768MB DDR 2700 GeForce FX5200 128 Graphic Card

A few more details needed. Multi setting Is your 1800+ a t'bred or palamino? You need to reset the bios/cmos. Remove the battery or set the jumpers(not sure with your board). Is your cooling up to the job? Tt Lanfire nf7-s v2.0 XP-m 2500@209x11 SP 97 512mb pc3200 Jou Jye 550w psu FX5600 WDCaviar 160gb sata ;~}

The multiplier on my 1800+ is unlocked...I'm guessing that your's is too. Don't try for max CPU speed, shoot for max stable FSB. FSB is where the performance is. I have my 1800+ at 1680mhz (8 x 210mhz)...that's roughly the same clock speed as a 2000+, but 210 vs 133 FSB is a significant difference. Your PC2700 is gonna hold you back, so chances are you won't be able to hit 200mhz FSB...but here are a few suggestions to get ya going. It's all trial & error. Be aware that you may have to raise the CPU voltage (vcore) to allow your system to run stable: 10.0 x 166 = 1667mhz (2000+) 9.5 x 175 = 1662.5mhz (2000+) 9.5 x 180 = 1710mhz (2100+?) 10.5 x 166 = 1750mhz (2100+) 10.0 x 175 = 1750mhz (2100+) 11.0 x 166 = 1833mhz (2200+) 10.0 x 180 = 1800mhz (2200+) This will give you an idea of how I attacked my overclock: http://www.computing.net/cpus/wwwboard/forum/10077.html Asus A7N8X-X 1800+ @8x210mhz 512mb PC3200 Ti4200/8X 128mb WDC 60GB

your pc2700 ram is definatly holding you back. I run my Tbred "A" 1800+ at 11.0 X 166MHz . I use 1.6 VCORE and generic pc2700 ram. I also water cool to keep the temps down to 40 degrees idle, 50 full load (on die thermister temp)