hello people ok finally got my secound rig sorted heres the specs: Asus p4p800-se pentium 4 3.00Eghz, skt 478 1gb pc2700 300w PSU, single 12v rail coolermaster aluminium cooler (pretty poor) uprated coolermaster HSF on the chipset anyhow im Overclocking so my settings are CPU FSB = 250Mhz CPU vcore = 1.525v Mem voltage = 2.65v AGP VDDQ voltage = 1.50v AGP/PCI = 66/33Mhz Ram Freq = 320 which gives me 3.75ghz But i cant go anymore and i heard people goign thurther i have tried pushing up the vcore when pushing up the CPU FSB but still it wont post i just get a black screen and so i have to restart and it resets the CSMOS. what next can i try to get a higher OC as im aiming for 4ghz on air cooling current temps are 45-50 celecius idle and MB at 28celcius thanks Damian Cole Pentium4 3.20ghz@ 3.5ghz 1Gb Crucial XMS PC3200CL2 1 X 80GB HDD OS 1X 40GB HDD STORAGE NVDIA GeForce4 MX4000 Pro ASUS P4-U800-X 600w PSU 12v 1-14amp 2-15amp WinXp

Do you have the northwood or the prescott core? If you have northwood, max vcore would be 1.7v and prescott is 1.525v... Seems like you are doing the FSB overclocking and I believe the Asus PxP800 series does not have a northbridge cooler and thus FSB overclock can be difficult after 250Mhz. So one solution would be to buy a fan attach to the northbridge and raise the AGP VDDQ voltage from 1.5v to 1.7v with the fan to see if that gives you more FSB. Somehow the AGP VGGQ voltage = Northbridge voltage and they misspell it... TMP-Man Asus P5P800-SE PAT P4 506 @ 4009Mhz 1.3625v Thermaltake CLP0024 w/ 1700RPM 92MM + AS5 2GB OCZ 2-3-2-5 DDR400 120GB/300GB 7200RPM HD MSI 6600GT AGP 565/1100 VF700 ALCU AS5

"I believe the Asus PxP800 series does not have a northbridge cooler " What I meant was cooling fan... TMP-Man Asus P5P800-SE PAT P4 506 @ 4009Mhz 1.3625v Thermaltake CLP0024 w/ 1700RPM 92MM + AS5 2GB OCZ 2-3-2-5 DDR400 120GB/300GB 7200RPM HD MSI 6600GT AGP 565/1100 VF700 ALCU AS5

"Ram Freq = 320" Shouldn't it be 250MHz to match the CPU? In other words, 1:1 ratio?

I doubt his pc2700 RAM can handle 250Mhz in a 1:1 ratio. In order to run in sync with the CPU FSB, he would need pc4000 (500Mhz DDR) Ram. I have no idea what ratio your running at right now, but let me give it a shot. Even at 5/4 you would need pc3200 ram, 250x15(multiplier)=3750MHz; 250x4(Quad Pumped)=1000Mhz FSB; 250/5=50x4=200Mhz. At a 4/3 ratio your ram would run at 188Mhz (375Mhz DDR). So i assume your using 3/2 (if there is such a option) that would give you 250/3=83x2=166Mhz or pc2700 (333Mhz DDR). Post a screenshot of CPU-Z if you dont mind, both memory and CPU tab shots. http://www.cpuid.com/download/cpu-z-136.zip TMP-Man, does that AGP VDDQ voltage which really means Northbridge Voltage, apply to Abit boards aswell? I thought is was for the AGP BUS = 1.5v. Prescott 2.8Ghz Oc'ed @ 3.6Ghz; 5:4 ratio Abit Is7-E Motherboard, i865-PE Chipset Muskin pc3200 Enhanced, 412Mhz; 2.5-3-3-6 Pny 6800nu; 430Mhz 820Mhz; 16p,5vp Two 36Gb Raptors in raid0 a

"TMP-Man, does that AGP VDDQ voltage which really means Northbridge Voltage, apply to Abit boards aswell? I thought is was for the AGP BUS = 1.5v." 2X AGP = 3.3v 4X AGP = 1.5v 8X AgP = 0.8v So if you have 8X AGP, how can you get to 1.5v in the BIOS? If that is not the northbridge voltage, what else can it be? TMP-Man Asus P5P800-SE PAT P4 506 @ 4009Mhz 1.3625v Thermaltake CLP0024 w/ 1700RPM 92MM + AS5 2GB OCZ 2-3-2-5 DDR400 120GB/300GB 7200RPM HD MSI 6600GT AGP 565/1100 VF700 ALCU AS5

hello yes it is a Prescott hence the "3.00(E)" and yes i do have a uprated heatsink (thermaltake tiger) which keeps it 2 celcius cooler OC than with the aluminum ASUS one. Ill take CPU-Z shots when i get back home and il try bumping up the northwood voltage to 1.7v as suggested. As every one else i thought it was the AGP slot voltage. thanks Damian Cole Pentium4 3.20ghz@ 3.5ghz 1Gb Crucial XMS PC3200CL2 1 X 80GB HDD OS 1X 40GB HDD STORAGE NVDIA GeForce4 MX4000 Pro ASUS P4-U800-X 600w PSU 12v 1-14amp 2-15amp WinXp