P5B Deluxe OC issues

Hi Everyone,
Im a relative noob to overclocking with the later intel chipsets and AMD 64 chipsets since my last processor has been an AMD XP TBred A core which i had running at a nice 2.3ghz.

Anyway ive built this HTPC for a friend comprising of the following:
E6300
2GB Kingston Valueram PC 5300 DDR 667 1.8v Ram
Asus P5B Deluxe Wifi (C1) Bios Ver 8040
Antec Trio 430w (low on 5v.3v, good on12v)
7900GS

Anyway i thought id have a crack at overclocking it to 2.8ghz+ however i can only post at a paltry FSB of 320. The ram is definately capable of DDR800 Speeds, i ran it under orthos2004 for a hour at DDR800 speeds using a different ram divider. So that eliminates the ram...

I set the CPU multiplier to 6, increased the vcore to 1.4v, ram to 1.9v and then set the FSB to 334 (thinking about the strapping thing) however there was no post yet again!

I havent touched the FSB/NB etc. voltages which may be my issue.

Ive also read up on that strapping article from the tech repository however i get quite confused by it in some segments if someone could explain it to me that would be great.

he is happy with 2.24Ghz for his core2 as its just a HTPC for him and its a stable OC however i want to know what this board can do for me since i am building my C2D System soon with PC8000Ram or above

Also it may be irrelivant however ive set the PCI bandwith to 110, however i cant post with it at 100 either

Thanks for the help in advance
Julius

*edit*
Also i remember reading somewhere people got that problem of switching it on, it would switch off again quickly then after a pause of a few seconds switch on. My one suffers that every now and then.

*edit*
After reading a few guides i set the NB voltage to 1.45 and 334 would post and be prime stable however 340 didnt work. I then set the max voltages that i decided to be safe (FSB 1.35, NB 1.65, SB 1.6) and 401FSB would not post with the multi set at either 6 or 7. I had a vcore of 1.5 aswell when i tried to post at 401fsb.

Is there a possability my board is an overclocking dud? :(

Take a look at this thread here to see what other people have done:

http://www.hardforum.com/showthread.php?t=1075792

It is now closed but we are doing a new one here at XS. :toast:

Also, look at my sig to see what I managed with water cooling so far.

I would say read a bunch of guides on this for what BIOS settings to use - a good one is here:

http://www.thetechrepository.com/showthread.php?t=41

I would recommend that you use a program called memtest86 to check out how high your RAM can go before doing anything else. Set a fsb close to stock, make the multi whatever it needs to be and start going up 10 mhz in ram frequency at a time. Once you know that, you will know exactly how high you can go before that becomes your bottleneck.

As a reference, my chip/mobo combo does 3.5 ghz with:

fsb = 500
vcore = 1.4875
vnb = 1.55
vTT (termination voltage) = 1.4
vMCH = auto
vSB = 1.6
vDIMM = 2.25 (my RAM is specced at 2.2 but asus' bios only has 2.25)

and all the other settings like are shown in the Tech Repository guide. Hope some of this helps. In my opinion, you need a better cooler if you're going air. The mobo overclocks poorly between around 370-400, so if you can't get it stable there you may have to go straight to 400 or 401. I didn't even try anything less than that to start.

Try jumping right to 400, also might be a CPU limitation on the FSB...