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Lapping IHS on P4

P

Parabellum

[H]ard|Gawd
Joined
Nov 4, 2001
Messages
1,895
Hello,

I decided to keep my P4 and get a better video card to keep up with games. Since I keep my CPU, I want to get the most out of it. I will probably get a PC P&C 510 Deluxe PSU acheive 3.8-3.9 GHz but I want the very best of my cooling setup as I don't want to mess with water or vapo. Too much time consuming for me. I was wondering if by lapping my CPU I would get much better cooling. I want to get a dead socket 478 motherboard and cut out the socket so that I can lap my P4 in safety. I also wish to lap to mirror finish my SP-94. What is to be expected by doing this? 2-3ºC cooler? Does it make a tangible difference on temps?

Thanks

Para
 
The IHS is pretty smooth already, I'm not sure you'd get much more out of it. You might want to buy a newer heatsink, such as the XP-90 or XP-120, which are bigger with more heatpipes. You could also try completely removing the IHS and having complete contact with the core, although that might mess up the mounting mechanism and not give as much pressure/contact as needed. I haven't worked on P4s for awhile so I really can't help much, maybe someone with more expertise could give some more suggestions. Good luck hitting the big 4.0 though :cool:
 
most i would expect is like 1C difference, maybe more...but i wouldn't count on it. i still think it's worth it though if you like getting the most of things. personally i would just lap it without the socket, it's really not that hard to avoid the pins and you can keep your eye on things, and you still run the risk of bending the pins if you get over-confident with the socket thing
 
In going from a lapped to 2000grit SP-94 to a Lapped to 2000 grit XP-120 i got no drop in load temp at all. What i did gain was a quieter fan on my heatsink. I used a 92mm tornado on the SP-94 and a Sunon 108cfm on the XP-120. I have since switched to a cheap dynex 72 cfm fan and actually dropped 1c on load temps from the Sunon.
 
Thanks for the info. I gave up on the big 4.0 with my current setup. I am able to hit 3.9GHz at 300FSB but it is unstable probably due to motherboard drooping or power supply not powerfull enough. I remember when I first fiddled with this setup I had a 15K SCSI setup; I was able to run 3d mark 01 with my SATA drive but not with my SCSI. That let me think that my power supply was not up to the task. Since I have decided to stick to AGP a while longer, I though that it would be a great idea to get the CPU the fastest it can. At 3.75GHz I am edging a 4000+ A64 in games, or surpass it. I will probably get a cheap used X800 XT PE and it will do the job just fine ;)

Para
 
Yeah, I have bent some pins on my last 3.0C.. :eek: Damn I was scared, I was sweating like a pig :eek:

The last time I uninstalled my SP-94, the CPU went with it as it was glued to it. I think I dropped to much AS5. Fortunately, no pins were pulled off. Thanks god :eek:

Para
 
Well,the P4's latency is really too high to come close to the 4000+ in games, maybe more like a 3500+, but in any kind of content creation, office stuff, etc. etc. that CPU is going to own. The only other thing I can think of is what PSU do you have now? Maybe that new PSU could really help you out. Also, how are your mosfets? If they have no cooling, there's your problem right there. Also, are you using dividers to get your RAM totally out of the way?
 
i think lapping the IHS is a great idea, i did it and i didnt see any temp difference when no OC but when i OC temp stays the same, before it would go up like 5C stays 36C load all day no matter how hot it is, before would go to 40C
3.0ghz northwood @ 3.3ghz
XP-90 w/ 92mm panaflo medium

see its not flat, outsides are higher than middle


 
yah, my A64 IHS was pretty damn uneven, when i lapped it i noticed the sides and various areas in the middle were raised quite a bit
 
I lapped the IHS on my 3.0c. Dropped temps by 2c, then lapped the heatsink and dropped another 1-2c. Worth the 2-days I put into the project. The IHS was concave as hell, center was a LOT lower than the corners.

It's in the HTPC now. Got an A64 3200+ for my machine since I just game and surf the web (with some occasional coding). Haven't lapped it yet though. Been happy with the temps being HALF of what the P4 was.
 
Yes. Yes lapping the ISH is a LOVELY idea.

Trust me.

Man, there is no point in using a dead socket on a motherboard to help protect your processor.

What I did was I just lapped my IHS to a mirror finish, then I used ISOPROPANOL and a vinyl brush on the pins to clean the residue from the IHS off of them. And bam, it works perfect. Dropped my temps roughly 8 degrees.
 
fluxion said:
most i would expect is like 1C difference, maybe more...but i wouldn't count on it. i still think it's worth it though if you like getting the most of things. personally i would just lap it without the socket, it's really not that hard to avoid the pins and you can keep your eye on things, and you still run the risk of bending the pins if you get over-confident with the socket thing
Click to expand...
dropped my temps from 12c to a 4c delta load vs idle(cpus at 1.475v), i lapped it past 2000 grit on both block and cpu and i razor bladed the as5 as thin as i could do tho :p i need to find some 3000/4000 grit and get rid of the need for a tim and get another fan for my radiator

my cpu and water block flatness/smoothness is soo good i get NO temp difference even after 200 hours and about 10 power offs and tons of load and idling lol
 
ryuji said:
dropped my temps from 12c to a 4c delta load vs idle(cpus at 1.475v), i lapped it past 2000 grit on both block and cpu and i razor bladed the as5 as thin as i could do tho :p i need to find some 3000/4000 grit and get rid of the need for a tim and get another fan for my radiator

my cpu and water block flatness/smoothness is soo good i get NO temp difference even after 200 hours and about 10 power offs and tons of load and idling lol
Click to expand...
Well, if you're going to go that hardcore about it it's much easier just to pull it off and put the block on the bare core :cool:
 
Mr. K6 said:
Well, if you're going to go that hardcore about it it's much easier just to pull it off and put the block on the bare core :cool:
Click to expand...
if only it wasnt soldered to the core
 
lol that would take a bitchin long time, for what? .01 degs C less? getting rid of the need for TIM will drop temp another 1 or 2 C
 
ryuji said:
if only it wasnt soldered to the core
Click to expand...
Since when do they solder it to the core? Usually you just freeze the bastard and pry it off with a razor, I've seen it done many times. There's only some kind of TIM connecting it to the core, that's it.
 
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