some1 help? 1.8g@2.4g+, but cant OC when switch to VIA P4PB 400 MB

[rawfishz]

I recently brought a VIA p4pb MB from Frys. but I cant OC the P4 1.8g over 2G.

I can easy OC the 1.8g to 2.4g by just setting the bus speed to 132 in my previous MB-Iwill p4e(845E chipset) with the stock fan, 1 step overlock. and the pc is running very stable. I am sure it can be OC above 2.4G to at least 2.8G if the P4E can support faster bus speed.

however, things change when I switch to the P4PB. I only change the HDD, CD-rom and RAM and add a 56k pci modem . the one, PC2700 non brand name 512M, can't not use it on the P4PB(can't trun the PC on). now I use 256M Kbyte 2700. even thought I increase the voltage to 1.7v and descease the memory speed to 100Mhz, I still cant OC it to 2.4G(cant start). comparing to the P4E, which has very limited OC feathers cuz IWILL is focus on the server/workstation market, Via p4pb 400-cfl has most the OC feather that we can see on other popular MB. from what i has read in the internet, this board target on OC player when it came out. it means it sholud OC friendly, I think. but strange..

who can help me or tell me what make it so difficult to OC?

my pc detail :
P4 1.8A Ghz northwood 400mhz
MB: 1. Iwill P4E, intel 845e , 533/400mhz, 6 channel audio, onboard ata 133 rain + ide(8 HDD max), AGP 4x, usb 2.0, 2 ram dimm
2. Via p4pb 400-cfl ,via p4x400, 533/400Mhz, 6 chanel, onboard ata 133 ide, usb 2.0, 3 ram dimm, AGP 8x , lan , firewire, card reader support, ect.
ram: 512M 333mhz non brand name(Nanya chipset)- -can't boot on P4PB, 256M 333mhz Kbyte
video card: powercolor radeon 8500le 128M agp 4X
hdd: maxtor 20g 2M ata100 connect to the P4PB, WD 80g 8M ata100 connect to P4E
400w PSU - Allied

 

[RamIt]

What are your bios settings? Does the board support an AGP-PCI lock?

 

[rawfishz]

Originally posted by: RamIt
What are your bios settings? Does the board support an AGP-PCI lock?

what u mean" the agp-pci lock ' ?
there are some feathers that related to the agp setting in the Advanced Chipset section: agp mode : 4x , agp driving control : auto , cpu&pci bus control: I didn't set , cpu to pci post write : enabled

bios setup: I dont what I should set. I try different value on the DRAM setting , cpu voltage and cpu bus. I can DRAM CLOCK(ram) running in the 100,133mhz,166Mhz, and the cpu clock running on 100mhz--110mhz(the maximum I can OC . except those , I do not change any value in the bios.

 

[RamIt]

What are your options under cpu&pci bus control? This may be your problem.

 

[rawfishz]

well, that setting is printed on the manual, but doesn't appear on the bios. too bad

I have tried some different setting on the DRAM and can increase the bus speed a little bit(120mhz), but it is very instable. finally, fail

I think it maybe the ram's problem(low quality) and the board is picky on the memories cause the OC failed.

better to oc the old one(p4e)...

 

[MDE]

VIA doesn't have a single chipset that supports AGP\PCI lock AFAIK. That's one of the reasons nobody that overclocks looks at VIA as a viable choice. Rawfishz, when you raise the FSB unless there is a lock on the AGP and PCI bus speeds, they go up as well, and when that happens your AGP\PCI devices tend to go screwy which causes instability.