It runs perfectly stable at FSB 210. If I set it to 211 it wonīt even post??? Why not? It does not help when I set the memory timings to the slowest settings and 266MHZ..temp is around 48 C at full load, at 210 FSB. Motherboard is a brand new MSI NEO 875P I use a 300W Power supply, is that to little? Should I raise the voltage on the AGP (and how much), when i overclock the FSB?

Hi, I'm more of AMD guy but I think i can help you. I'm gonna narrow it two to 2 reasons. 1 is yes, you prolly need to set your timings slower, if your not so sure what the timings you should set it to, set it BY SPD. It'll be sure to boot Also, a 300-watt power supply is prolly not enough to power that CPU. Go with at least 400watt if you wanna OC that beast. Abit NF7-S ver.2 Athlon 2800+ to 3200+ 420 Mhz FSB Thermalright SLK-900(a)w/ smart fan 2 Geil 512mb pc3200 Sapphire Radeon 9500 non-pro Maxtor 80 GB w/8mb cache Thermaltake PSU 420 watt Thermaltake Xaser 2 Case

Almost all 800mhz P4 dual channel boards are very selective on the type/brand of memory. The memory timing setting and ratio (FSB to memory speed + timing)setting determine whether the PC would even boot up. Spend time reading the manual that comes with the board. Your AGP voltage has nothing to do with you havding problem in running over 210 FSB. If you are running at 211 FSB, I don't see how you would get 266mhz in memory speed. Unless, the ratio you pick is 4:5 which very few board/memory could do. Try to set the memory ratio 3:2 or 1:1.

don't these boards implement some type of dynamic overclocking? maybe that has something to do with it?

"dynamic overclocking" is increasing FSB when applications are kicking in and reducing FSB when idle. The guys is having problem in posting prior to getting into O/S.

I'd say you definitely need a bigger power supply, 300 w just isn't enough for a powerful p4 like that, especially when overclocking. This probably isn't an issue with these p4's, but maybe the voltage is a problem?