Replacing my CPU going wrong!

tombritten · May 10, 2017

Hey guys!

I have bought a CPU i7 6700k 4.0GHz to replace my i5 6400 2.7GHz (both socket 1151LGA). For some reason when I replace the CPU, the CPU fan goes crazy as in its working on a constant 100% and I don't know why? Note: The computer works fine with the new cpu installed, turns on and I can access averything as normal.

- Ive bought and installed new thermal paste. Nothing.

- Ive checked the temperature of the new CPU temp and its about 30 degrees.

- When re-installing the old CPU the fan is fine and works at a normal rate.

Just so we're clear, I'm using the same fan for both, I only bought the chip.

I have no idea what's going on! Any help would be amazing.

Thanks in advance!
Tom

DRagor · May 10, 2017

Are you using 6400 stock cooler with 6700k? Or do you have different cooler?

tombritten · May 10, 2017

DRagor :

Im using the stock cooler.

DRagor · May 10, 2017

There you go. 6700K makes more heat then 6400 (the reason it is not sold with stock cooler), no wonder your stock fan is going like crazy to keep it cool. You will need to get aftermarket cooler to get proper cooling (and silence).

tombritten · May 10, 2017

DRagor :

What cpu would you recommend?

DRagor · May 10, 2017

Cooler you mean? What motherboard and case you have? Going to overclock that 6700k?

tombritten · May 10, 2017

DRagor :

Yes cooler I mean. I'm not sure about what motherboard I have, I have an alienware aurora R5. And I'm not going to overclock it.

DRagor · May 10, 2017

Ah, you got me fooled. This thing is prebuilt, and probably comes with non-stock cooler. Specification does not say what kind of cooler it is though. Could you take a picture of the cooler and post here?

tombritten · May 10, 2017

DRagor :

Haha yeah.

I wasn't sure how to add photos in-line so I've added them to my G.Drive. See the link below:

https://drive.google.com/drive/folders/0BwIboHVSpnyzS05oUERYMk1LRzQ?usp=sharing

Thanks again for your help!

DRagor · May 10, 2017

That's definitely not stock intel cooler. However, I don't think it's beefy enough for 6700K. But there's awfully low amount of space for the cooler on that board. It would have to be something powerful but small. Note how close the ram sticks are to the fan. It's a 120 mm fan or 140 mm?

tombritten · May 10, 2017

DRagor :

I'm not sure, I don't have anything to measure it with but I've added 2 new photos in the folder on drive so you can get more of an idea about how close to the ram it is.

XxDarkMario20xX · May 10, 2017

Are you turning your Computer Into Gaming Comp?

Also By looking at the photos looks like the parts in your comp only have little space to breath kinda feels like there hardly any room inside!

tombritten · May 10, 2017

XxDarkMario20xX :

I bought it with a GTX 1070 in it so yeah, I want to do a bit of gaming on it.

DRagor · May 10, 2017

One more problem is this is not standard motherboard, so I'm not even sure if typical aftermarket cooler will fit here.

tombritten · May 10, 2017

DRagor :

hmm okay, what do you recommend?

DRagor · May 10, 2017

This thing was made by Dell, right? So I would contact their customer support first, and try to get answer to simple question: does the motherboard has standard cooler mounting system? Then I would measure available space (all three dimensions) to see how big cooler can fit. Without that data it is hard to make any reasonable decisions.

tombritten · May 10, 2017

DRagor :

Ok great thanks Dragor. I'll check and get back to you tomorrow!

DRagor · May 10, 2017

In the meantime, could you do a little test? Run your most CPU-heavy program or game for about half a hour and record max CPU. If not above 70 C, extend test to 1 hour. That way we will know if current cooler is capable of keeping your new CPU under control.

tombritten · May 11, 2017

DRagor :

Sure! Ill see when I get back from work!

tombritten · May 11, 2017

DRagor :

Yeah mate, the fan is fine. What I did notice is that on the alienware thermal system the cpu cooler isnt there, it appears as a pump. which is weird? I spoke to a guy at Maplin (a computer hardware store) and he basically said that it's picking the fan up as a water cooler which is weird! But it doesn;t with the other chip?

DRagor · May 11, 2017

That's possible. Look at the specs of your machine at net: there are several versions, and the pictures show water cooling system. My guess is water cooling is mounted in systems with 6700k, and the BIOS might be hard-coded to think that if it has 6700k installed, it also has water cooling installed. Since in water cooling the pump is set to work on full speed all time, it makes sense - BIOS thinks your fan is pump and sets it to full speed.
So, if the temps were good in the test, you can try to change BIOS settings so it will use it as fan again. IF it is possible, since this is special motherboard build for this very system, I suppose BIOS options are quite limited. But it's worth trying anyway.

tombritten · May 11, 2017

DRagor :

Hey mate, just got off the phone to Dell tech support and yes basically becuae its an i7 it thinks its a water cooler so will run at 100% all the time. I went into the bios and there is no way to change this... my only option is to buy a watercooler :/ im not sure about them though, never used or installed one. Not even sure where to start!

DRagor · May 11, 2017

The joy of upgrading prebuilt machine - you never know what devil sits in the box.
Can't help you with watercooler as I never used any either. But, maybe there's a workaround. If you could connect CPU fan to some other header normally used by case fan, there's a chance you could make it work with varying speed based on CPU temp (such settings should be even in so much limited BIOS). However, the system might not boot when nothing is connected to CPU_FAN. So you would need to connect one of case fans to CPU_FAN header; it would run full speed but if you would use silent low-rpm fan, it would not be a problem.
Trick no 2, swap the fan on cooler to silent one. As far as I can see on pictures, the fan is screwed to the heatsink, so it should be possible to replace it. Actually I think this is best way to solve that problem. All you would need is to find same size fan that will be silent even on full speed.

tombritten · May 11, 2017

DRagor :

The joy of upgrading prebuilt machine - you never know what devil sits in the box.
Can't help you with watercooler as I never used any either. But, maybe there's a workaround. If you could connect CPU fan to some other header normally used by case fan, there's a chance you could make it work with varying speed based on CPU temp (such settings should be even in so much limited BIOS). However, the system might not boot when nothing is connected to CPU_FAN. So you would need to connect one of case fans to CPU_FAN header; it would run full speed but if you would use silent low-rpm fan, it would not be a problem.
Trick no 2, swap the fan on cooler to silent one. As far as I can see on pictures, the fan is screwed to the heatsink, so it should be possible to replace it. Actually I think this is best way to solve that problem. All you would need is to find same size fan that will be silent even on full speed.

Ok great massive thanks for your help! Im going to try with a water cooler and get it installed!

Replacing my CPU going wrong!

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