Socket-775/478 Prescott Overclocking thread
 

Please post the following;
1.) Model/Stepping
2.) Highest Overclock at stock Vcore
3.) Highest OC with Vcore increase
4.) Cooling/temp
5.) Motherboard

Here's a link to the new Intel line-up.

1.) P4 530 SL7KK Malay / P4 3.0E SL79L Philippines
2.) 3750MHz (750MHz OC at 250FSB 1:1 leave Vcore on Auto!) / 3750MHz also on Auto
3.) haven't pushed it yet / 4.0GHz @ 1.60Vcore
4.) Stock cooling - 32C Idle, 40C OC (New Intel cooler's are excellent, room Air Conditioned, Case open) / H20 cooled Danger Den TDX 27C Idle, 30C OC
5.) MSI 915G Combo FR / Abit AI7

Due to D-VID, and On-Demand technology found in P4, it's best to NEVER to set your Vcore manually even at stock Vcore. What is best is to leave the setting at Auto in the BIOS. This allows (in my opinion) D-VID not to come into conflict with motherboard PWM voltage regulation. You can find many of the reasons supporting my theory in my article about Socket-478 Prescott's (which remain the best HyperThreading P4 overclocker's ever made, in my opinion) HERE

I don't think it's worth the money to buy a S775 setup at this time :)

but 4ghz P4 power out of the box is quite nice :super:

I have a question rather then a contribution, sorry :)

You say it is best to leave the Vcore setting on "auto" in the bios but in your OC it says you had it set to 1.60V.
Did you go in against your own advice or did you have a Vmod done and set it to 1.60v through a variable potentiometer?

You have to let me know your room temp here.;)

I think between 14-17°C

http://uk.weather.yahoo.com/USWA/USWA0300/index_c.html

Plus this! L3D, I like to see it running as a regular setup; case panel closed; normal household room temp (I'd say around 23C).

Here is mine:

S478 Precott 2.8E @3.5
Vcore 1.5V
P4P800 Deluxe
Room temp ~21C
JMC cooler 42C idle and 55C stressed
XPIDER II, one intake and one out

Note: knowing Asus P4 boards under report CPU temps.:D

http://computing.net/cpus/wwwboard/forum/10538.html

Northwood starts to speed throttle at ~75°C
Prescott starts to speed throttle at ~77°C
http://www.digit-life.com/articles2/p4-throttling/

so I don't really see the difference, and since the Prescott runs hotter by default then the NW at same speeds, you will have a slower system in the end :*

Setting Vcore to Auto does not work in OCing. To make sure I just re-did the setting. It might work for certain processors; but it would be "rare".

Anyway, mine is at 1.5V.

Yes I'm absolutely convinced based on empircal data, and reading Intel Wite Paper's, it's better to leave Prescott's (albeit 478 or 775) on Auto when your seeking to find the best overclock without manipulating Vcore. To get to 4.0GHz I did have to raise the Vcore, and I think it was acutally lower then 1.60V, that it was 1.550V. Anyway in that case I found it was better. That's what I've expereinced with the two Prescott's I have. When I set the Vcore manually to 1.375V (stock voltage) my P4 530 will only do 230FSB. Yet on Auto it does 250FSB.

With the Socket-478 Prescott I found that setting it on a manual setting of 1.375V gives me a an OC of about 240FSB BUT the PWM mobo power circuitry really heat's up. On Auto the 478-Prescott will do 250FSB or 3750MHz, as well.

As a "purist" my intention is to find the CPU's maximum speed, without overvolting. In this respect I'm only exploiting what the manufacturer intended the processor to do in the first place, and furthermore reach the ceiling beyond the model number as well.

In so far as my temps, if I'm reviewing then I would either close the case, or qualify the conditions under which I maintain the temps I do, however; I won't apologize for the ambeint temp of my room, or if I choose to leave my case side-panel off. I certainly wouldn't begrudge anyone if they had more case fans then me, so I often wonder why this topic seems to bother people? Why in the world would I replace the side-panel on my case, and raise my temps, dropping performance, just because someone else has a higher temp? That's as ridiculous as being angry at people because they have Prometeia's, or common sense. Hang in there, you'll learn.