CPU/CPU Heatsink Lapping Experiances

[Prysin]

18 hours ago, ChrisCross said:

maybe just something to reply on people who think they need a high-end 3,4ghz ram kit for gaming. 

Oh stuff it. The price between 1600 2x4GB DDR3 and 2400 2x4GB DDR3 is around 5 dollars. The Price difference between 2133 2x4GB DDR4 and 3000 2x4GB DDR4 is like 9 dollars.

 

and people are bitching about the 10 dollar difference. But they will gladly spend 40 bucks more for a different version of a 980Ti that offer microscopic benefits over any other 980Ti even at the best of days. 

 

there is no proven DOWNSIDE to faster RAM. ONLY upsides. Spend 10 bucks, get a few FPS, get faster rendering times (proven since forever that faster RAM helps rendering times). 

[helping]

On 5/6/2016 at 2:49 AM, ssnakee said:

this video triggered me so hard that i even created an account to rant LOL

tired of things beeing WHATEVER? look at the physics first dude

the argument of the video is: does sanding the flat surface of the heatsink affects the performance of the heat transfer?

Well lets take a look in to the problem

heat transfer is constrained by 3 things surface area,material of the things transfering heat and power(in our case intel or amd gives us a easy way to figure this out as TDP if you want to go further you need to look into the voltage that the processor takes and the amperage)

 

Now lets analyze the problem in easy parts:

 

Does sanding the flat surface change the thermal conductivity of copper? NO, sure it makes it more shiny and maybe you could make it more flat but it does not change shit about the properties of the material 

 

Does sanding change the surface area in contact with the CPU? Maybe, if you had a shitty manufactured heatsink it could change the surface area but a better question is:

Does the change on the surface area could be meaningful to the performance? It depends on how much the change in contact area is if is >1mm it will do shit and unless u had a heatsink made with stone tools and glue that change will be almost nothing

 

does sanding change the power? lol NO

 

by just taking the physics in consideration first you realize that sanding does nothing

 

TL;DR if you want that things stop being whatever check the physics first, either change the materials of the heatpipes or increase the surface area by carving a grid on the heatsing and then embed them on to the cpu or i dont know but HOLY SHIT DONT COMPLAIN THAT THINGS ARE WHATEVER IF YOU JUST MAKE THE THING THAT WAS FLAT EVEN FLATTER

 

\rant

You missed the entire fucking point of the video.

[ChrisCross]

1 hour ago, Prysin said:

 

the price difference between 8gb of 3,4ghz and 2,1ghz is about 30€ in germany and about 20$ in america.

thats about the price difference of a 120gb and a 240gb ssd. i would go with the ssd.

with the graphics cards its like with k-cpu's and z-mobo's, people buy them without ever overclocking. its a waste of money.

[diluzio91]

The last CPU I had to lap was an i5 2500k that was clocked at 4.2 with a prolimatech cooler. Here's the contact patch from a piece of glass with thermal paste spread over it pressed down on the CPU.  The contact patch shown here is the inverse of what would be touching the cooler. 

 

 

I don't have the cpu any longer but after lapping my load temperatures dropped by about 8*C, however I don't think that most people would experience this kind of result from lapping unless their IHS was similarly warped. 

[SkyKnight]

Be careful if you try this.  don't over Lapp it or you may cause a hole.  I know those who will try it probably won't run into this problem.  Just keep in mind you are removing some of the material and if you over do it you may cause your self some headaches

[ShaunC]

I lapped a heat sink back in the day for my AMD XP 3200+.  I lapped the stock heat sink and it made a 3-5 degree Celsius difference.  I remember the heat sink was pretty rough looking before and mirror finish afterwards.  The processor that i had back then ran super hot and kept rebooting from overheating.  After lapping and adding a bunch of case fans i was able to play on the pc for hours and it was staying below 70 degrees Celsius.  

[Optiplex780sff]

i would lap and polish the heat sink but leave the CPU alone you need the rough surface to hold the compound if you look at a CPU die it is mirror finish like GPU dies, old CPU's without lids are also mirror finish.