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CPU upgrade - Abnormal High Temps

cmillsy20

cmillsy20

cmillsy20

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Joined
18 Feb 2022
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6
Location
England
I upgraded CPU from i5-4690k to used i7-4790k and the temps are abnormally high. I replaced the thermal paste and cooler is seated properly and shown working in bios. I have a cooler master Seidon 120v v2 Liquid cooler 120mm. Before idle temps were around 40 at 4ghz on the i5 (vcore 1.053). Now on new cpu still at 4ghz because I didn’t want to overclock yet, idle 60-70. As soon as it loaded up chrome temps were reaching 80-90 which I had never experienced before and I understand it draws more power but my question is: is it the cooler that needs upgrading or should I send the chip back is it used up most of its life. Any tips to work this out would be appreciated, sorry for lack of knowledge if any more info is needed I can try to provide.
 
I know what it is but I have disabled it for my i5 and it still has low temps and I don't want to enable it because it can cause instability for oc/reduce performance. Also I tried a bios default settings profile (with the i7) which would've enabled this and temps were still high.
 
cmillsy20 said:
I know what it is but I have disabled it for my i5 and it still has low temps and I don't want to enable it because it can cause instability for oc/reduce performance. Also I tried a bios default settings profile (with the i7) which would've enabled this and temps were still high.
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If that's the case you've got a dodgy cpu as your cooler should handle that.
 
It's probably the Intel thermal paste between the die and IHS causing this. I bought a 4790k as a upgrade from a 4670k a few years ago and while my temps weren't as bad as yours I was seeing them in the high 40's at idle and load temps were 90+ when stress testing. These are extremely high temps for my cooling setup which uses external air through a pair of top end radiators. I borrowed a delidding kit from a kind member of the forums and delidded it. What I found once the IHS was removed was that the Intel thermal paste has set like concrete and was a right pain to remove. When it was eventually removed I cleaned up the die and IHS and put some nail varnish over the row of transistors on the pcb so that any spillage of liquid metal wouldn't cause a short. Next I applied liquid metal to the die and IHS, put the cpu back in the delidding tool and placed a thin bead of gasket sealant around the inside of the IHS, not the edge that the sealant is normally on, the bit inside of that so that when the IHS gets refitted it sits flush to the PCB. I then applied the IHS and refitted it using the relidding part of the tool and left it clamped down overnight. Refitted it the next morning and saw a temp drop of a whopping 25 degrees C. I reckon that is what yours needs as they are old now and the paste on a lot of them will have gone "off".

Delidding shouldn't be feared. If you use a proper tool there is no way to mess it up and it takes seconds to do. You would need one of these or one of the similar alternatives (I probably wouldn't bother with a 3d printed one from Ebay), some liquid metal, some clear nail varnish/laquer for the transistors and some IPA for cleaning everything.
 
Like I said, most likely delidded in the 1st place and it's been badly put back together. C states on or off will have very little impact at idle. Also probably more chance of winning the lottery than getting a faulty CPU.
 
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