Prescott 560 OC'd @ 4.8GHz on Asus P5AD2-E Premium

[OC_newbie]

Well it's my first time overclocking a socket 775 Pentium 4 and on a Asus P5AD2-E Premium motherboard. So I have some questions for those of you out there that have experience on this motherboard, but first let me list my current settings in BIOS.
Under the Advanced menu under JumperFree Configuration I have it set to manual overclocking with these settings...
Performance Mode [Standard]
AiBooster Support [Enabled]
CPU Lock Free [Auto]
CPU Frequency [267]
DRAM Frequency [712MHz]
PCI Express Frequency [100]
PCI Clock Synchronization Mode [33.33MHz]
Spread Spectrum [Auto]
Memory Voltage [2.00V]
Chipset Core Voltage [Auto]
CPU VCore Voltage [1.5875V]
FSB Termination Voltage [Auto]

Everthing else is default settings but I manually put the memory timings at their rated speed 4-4-4-12-4.
The setting that I'm totally clueless on is Chipset Core Voltage and FSB Termination Voltage. My goal is to OC to 5GHz and have it as stable as my current speed which hasn't had any problems yet. I did try 5GHz with those settings but Windows XP wouldn't load. Any help would be greatly appreciated, thank you.

Here's a screen shot of CPUZ...
http://xtremesystems.org/forums/atta...id=20804&stc=1

[beau_zo_brehm]

Well it's my first time overclocking a socket 775 Pentium 4 and on a Asus P5AD2-E Premium motherboard. So I have some questions for those of you out there that have experience on this motherboard, but first let me list my current settings in BIOS.
Under the Advanced menu under JumperFree Configuration I have it set to manual overclocking with these settings...
Performance Mode [Standard]
AiBooster Support [Enabled]
CPU Lock Free [Auto]
CPU Frequency [267]
DRAM Frequency [712MHz]
PCI Express Frequency [100]
PCI Clock Synchronization Mode [33.33MHz]
Spread Spectrum [Auto]
Memory Voltage [2.00V]
Chipset Core Voltage [Auto]
CPU VCore Voltage [1.5875V]
FSB Termination Voltage [Auto]

Everthing else is default settings but I manually put the memory timings at their rated speed 4-4-4-12-4.
The setting that I'm totally clueless on is Chipset Core Voltage and FSB Termination Voltage. My goal is to OC to 5GHz and have it as stable as my current speed which hasn't had any problems yet. I did try 5GHz with those settings but Windows XP wouldn't load. Any help would be greatly appreciated, thank you.

depending on your cooling, those are some dangerously high voltages. your nb voltage should be 1.9-2 if your willing to go that high.

[OC_newbie]

Hmm I heard 1.5 volts was fine for FSB's at 1066MHz or do I need to move it to 1.6 just to go up 44MHz or so?

[naughty_guy]

On the safe side, you shouldn't increase your Vcore anymore if not lowering it 1-2 notches. What temperatures you getting? You might have hit the limit of your chip, won't go higher unless risking it.

1.525V-1.535V is GENERALLY accepted as the maximum "safe" voltage for a prescott for 24/7 use.

Also, could it be your RAM reaching the limit? What RAM you using?

Last but not least, do you have a powerful enough PSU with a strong 12V rail to power that CPU?

[beau_zo_brehm]

Hmm I heard 1.5 volts was fine for FSB's at 1066MHz or do I need to move it to 1.6 just to go up 44MHz or so?

no, most people find it nescessary to use high voltage on the nb for overclocking.

[dragonhunter]

You're propably @ the chip's limit. Be happy of what you got, 4.8ghz man!!! Don't push it cause you might regret later

[OC_newbie]

On the safe side, you shouldn't increase your Vcore anymore if not lowering it 1-2 notches. What temperatures you getting? You might have hit the limit of your chip, won't go higher unless risking it.

1.525V-1.535V is GENERALLY accepted as the maximum "safe" voltage for a prescott for 24/7 use.

Also, could it be your RAM reaching the limit? What RAM you using?

Last but not least, do you have a powerful enough PSU with a strong 12V rail to power that CPU?

Well the RAM I'm using is CORSAIR XMS2 Pro Series 1GB(512MB x 2) DDR2 PC2-5400 with activity LEDs, I know these can reach speeds of 765MHz or more, and I'm only at 712MHz. So I don't think it's the RAM.
Oh I checked my PSU it's a ANTEC 480W ATX TRUEBLUE480 with a max of 22A on the 12V rail.
I'm starting to think it's my cooling, because the CPU temp is about -38c with about 50% load or so.

[gclg2000]

awesome OC man

[OC_newbie]

On the safe side, you shouldn't increase your Vcore anymore if not lowering it 1-2 notches. What temperatures you getting? You might have hit the limit of your chip, won't go higher unless risking it.

1.525V-1.535V is GENERALLY accepted as the maximum "safe" voltage for a prescott for 24/7 use.

Also, could it be your RAM reaching the limit? What RAM you using?

Last but not least, do you have a powerful enough PSU with a strong 12V rail to power that CPU?

Well I got my CPU VCore Voltage down from 1.5875 to 1.5500, that's the lowest I can set it to for this clock speed. Also I still have Chipset Core Voltage and FSB Termination Voltage set to auto, I did try changing them but it didn't help.
I'm thinking about getting the new Prescott 570J (3.8GHz) with 2MB of L2 cache and Intel Extended Memory 64 Technology (Intel EM64T), when it comes out in late February 2005. I think the 570J that's out now is a waste of money, because the new version of it is so close for release.

[OC_newbie]

Here some pic's if anyone want's to see...

[xsky]

nice setup

i've got a simular rig. P4 560+VapoLS+875P-T.
mine does 4.7ghz with 1.35V...should test something more. But 5 Ghz is hard to reach, I tried that already

I won't upgrade to 570J either. My Mosfets can't take anymore for 24/7 than that although I've put some big copper coolers on them

[OC_newbie]

nice setup

i've got a simular rig. P4 560+VapoLS+875P-T.
mine does 4.7ghz with 1.35V...should test something more. But 5 Ghz is hard to reach, I tried that already

I won't upgrade to 570J either. My Mosfets can't take anymore for 24/7 than that although I've put some big copper coolers on them

Yeah I can't hit 5GHz either but with a 570J I see it very possible and much higher speeds. Nice system you got there too man, but you should try a 925XE board like mine for higher overclocks, also I haven't needed any extra cooling on my mosfets maybe it's cuz of the mobo I have.
What RAM are you using by the way?

[xsky]

at the moment 512MB Kingston HyperX BH-5.
unfortunately the mainboard has problems with 5:4 divider so they run 4:3.

but on monday my new sticks will arrive for some 1:1 action: ocz 4200el plat

[OC_newbie]

at the moment 512MB Kingston HyperX BH-5.
unfortunately the mainboard has problems with 5:4 divider so they run 4:3.

but on monday my new sticks will arrive for some 1:1 action: ocz 4200el plat

Cool man tell me how those run once you get them.

[PicaXuu]

OC newbie can you please confirm me if all SATA ports are locked on this motherboard ???

Thanks,

[OC_newbie]

OC newbie can you please confirm me if all SATA ports are locked on this motherboard ???

Thanks,

Well yes you can in a way... let me explain how this works.
At boot, Asus manipulates the PCI Express frequency and set ratios that result in a lower PCIe frequency than would be expected at a given clock frequency. Since PCIe frequency and CPU clock frequency are derived from the same PLL, then a Clock frequency of 258 (FSB of 1032), for example, would result in a PCIe frequency of 129. Asus has implemented their magic in the Auto setting for PCI Express, that's what I have mine set to instade of locking it to the default 100MHz.

Now let me get to how all this effects the SATA hard drives lol...
Asus, in addition to manipulating the PCIe frequency at boot, also manipulates the link frequency between the North and South bridge on the chipset to limit the "trigger" frequency for SATA failure. This allows the Asus P5AD2 to break through 258 and reach the highest overclock that I have yet seen of 278-283 with a normally equipped 775 system with both an ATI PCI Express video card and a SATA Hard Drive. This appears to be the limit of a 3.6ES CPU. Hmm I hope the new Prescott 2M (the 600 series) overclocks the same or better as the current one's, because just having that extra megabyte of level 2 cache adds about 7% performance in gaming and other applications too.
I strongly recommend getting a ATI video card for this motherboard as I did. The reason for this is that ATI's native PCIe solution vs. nVidia's bridged solution for PCIe has less overhead than the bridged nVidia PCIe and therefore handled higher PCIe frequencies.
I did some research on this and found that on a overclocked 925x platform the nVidia bridged PCIe solution is stable to about 250 to 258 CPU clock on the Asus and other 925x motherboards and then it fails at any higher FSB. The ATI PCIe cards, on the other hand, continue on to the CPU limit of 278-283 or what have you.

It looks like that it's not possible to implement a true PCI Express lock on the 925X/915 chipsets, while still achieving healthy overclocks. The best that I believe can be done to remove the PCIe, Link Frequency, and SATA failure from 925X/915 overclocking is to manipulate the boot algorithms for PCIe frequency and link frequency. Slightly higher overclocks are also possible using increased voltage to the chipset, but this still does not fix the PCIe and SATA issues.

Anyways this is why I decided on the Asus P5AD2-E Premium motherboard, I hope this helps you.

[willow]

Do you have a dvd burner ? I can't seem to get one to work on mine. Damnest thing!

[PicaXuu]

Oc_newbie and willow have you had any problems or issues with your Corsair memory while doing OC ???
Because I have read that some people have had some issues with that memory and that motherboad and I have just ordered this motherboard with this memory and are now afraid of having problems...

[sjmX`]

nice overclock me friend!!

[OC_newbie]

Do you have a dvd burner ? I can't seem to get one to work on mine. Damnest thing!

Yes I have a Plextor PX708A Internal DVD±R/RW drive and so far haven't had any problems.

[OC_newbie]

Oc_newbie and willow have you had any problems or issues with your Corsair memory while doing OC ???
Because I have read that some people have had some issues with that memory and that motherboad and I have just ordered this motherboard with this memory and are now afraid of having problems...

Sorry I took so long to reply, but I haven't been on the site for a few weeks.
Actually no I haven't had any problems with this memory or motherboard, they have been very stable.
Hey PicaXuu is your new system up and running now?

[PicaXuu]

OC_newbie sorry for taking so long time to answer but I went out on work a few days and just got home now...
I haven't installed my new system yet but I would like to know which bios version are you using in your P5AD2-E Premium ???
Can you also post some memory bandwith shots ???
Thanks for your help,

[elec999]

I am just curious whats the max memory voltage for this board in the bios.
Thanks