Originally Posted by NoAffinity

You definitely need to lock the AGP and PCI buses first. I don't know exactly where this option is in your BIOS, but I know it's in there. I would recommend posting in the mobo section for further help with your P4P800. There are plenty of members that own or have owned that board, and that can be of assistance with it. Just title the thread "Help w/ P4P800 OC'ing" or something similar (copy and paste if you like ), and they will come out of the woodworks.

Your RAM could very well be limiting you, but you could at least put it in a lower divider to find out the max of your CPU...and decide if you want to buy better RAM from there.

Originally Posted by NoAffinity

RAM 101

Basic RAM principles:

8) Your mobo will support any speed of RAM above what it is rated for. You can always run faster-rated RAM at slower speeds. The highest official JEDEC DDR RAM speed is PC3200, and all s478 motherboards offer support up to this speed (i.e. w/ an 800 mhz FSB CPU, your highest available divider will be 1:1, which supports DDR400). If you look a little futher into your manufacturer's compatibility list (if they've actually taken the time to test compatibility), you will most likely find that the board does officially support any given higher-rated RAM.

For example, if you can achieve a FSB of 270 with your CPU, then your mobo will support PC4400. If you can achieve a FSB of 240, then your mobo will support DDR500. Again, you can install any faster-rated RAM in your motherboard, but it will only be running at the twice the speed of the system bus.

Originally Posted by minsong79

On my p4p800 e-deluxe mobo, 2.8e is oc'd to 3.6 by having core clock set to 257 mgh. 257 * 14 gives you 3600 mgh. However, when the cpu was air cooled, highest (100% stable) I could get was 3.5 with 55c idle and over 60c load temp. I gave 1.575 vcore. I could get 3.6 with even with air cooling, but prime95 test failed after like 20 min... Last weekend, I got water cooling kit from my girl for valentine's day gift lol~~ As soon as I put the thing on, I raised the vcore to 1.6 and raised the clock to 272, hoping to get 3.8 (1gh oc), luckly, it went up to post, but failed to load windows. so, I tried 3.7. I got it to load windows, but prime95 test failed after couple min.

So, I only gained 100mgh by getting watercooling, but temp is much lower than before. So basically, if you have some watercooling, then you should be able to hit 3.6. by the way, my 2.8e runs fine with 1.6 vcore, but not at 1.625 vcore. However, 1.575 or 1.585 vcore should be fine.

Originally Posted by SCHMITTY769

I've managed to OC my comp to 3.6 from a 3.0, but my vcore is at 1.650-1.712, is there any way to get around that to OC it some more? Also, i have a p4p800s,with the agp/pci/...... locking thing, i've left it on auto and it OC's just fine.