Question Crazy temperature jumps with a used 9700k ?

[ASonic]

Hi,

I have an Asus H310M-E motherboard , which had a 8400 i5 installed on it, and I didn't want to change the motherboard , so I decided to get a 9700k CPU to replace the older one. Ordered used from ebay , 100% rated seller. So it has arrived, took it to the tech center. The guy, installed it with my old fan and it was overheating like crazy so we thought I needed a new fan, I bought a 100 watt one, he installed it, and the temperature is still jumping like crazy. From 70 to 100 then down to 80 and so on. The radiator itself is cold and no hot air comes out of the case. The motherboard does get heated a lot at the spot though. The tech is suggesting the seller sold a broken CPU, but the seller has 100% rating and says they've sold thousands of CPU's before with no issues like that. What could be the case here? My tech says it can be faulty CPU that is heating inside. The issue was a problem with both coolers, old and new. How dangerous is it to keep using it like this, even for a couple days until I decide if I should return it or not?

Thanks

 

[ASonic]

The cpu will actually reduce its power consumption when it hits it thermal limits so it actually put slightly less stress on the motherboard. Its been a while since I looked at the older cpu details. Things like a 13900k intel says can run at 100C constantly. It will reduce it clock a bit to prevent it from going above but for people that want the absolute maximum performance set the power limit to unlimited and it will hit 100c even on many water coolers.

Its hard to say the cooler you have shouldn't have a issue. The specs say your cpu is less than 100 watts, since you can not overclock it on a h310 board. The g400 says it is rated to 200 watts so even if they lie a bit you should still be good.

All I can think of is the cooler is mounted wrong or the mount is somehow defective.

I would run hwinfo64 and check the obvious to be sure it really is a 9700k. Then check the numbers to see what the clock rates etc are set to and make sure that they are defaults. Not so much a issue with a low end chipset like a h310 but many motherboard makers set overclock values by default on z series chip sets.

You should also be able to see if the chip is going into thermal limits...which means it won't burn itself up. Also it would be interesting if it was only some cores that overheat that tends to be bad thermal paste.

it is certain cores more than others, but they all go high up. G400 has 125 TDP , no? 212 black edition has 150W. I don't know really, buying another cooler only to see it overheat again or burn the mobo, will be painful.

 

[bill001g]

https://www.tomshardware.com/reviews/deepcool-ag400

It says they tested it at 250tdp. The coolmaster is a old design there are many better coolers.

 

[Phaaze88]

TDP ratings are generally, and unfortunately, not reliable. The 9700K's 95w TDP is essentially a lie. It only applies to all core workloads with the cpu running at just the base clock. 'The real TDP', from Intel Turbo Boost, is hidden. It's in the realm of 180~200w, going by Tom's and TPU reviews.
How is the casual guy/gal supposed to know what cooler to pair with what cpu these days? They don't normally check reviews, and don't know much about bios. I imagine most look for a cooler that looks 'good enough', buy it, expect it to do the job, and not have to require anything else on their end.


Also, can you post some pictures of the PC? That may help others trying to help you. PLEASE remove the side glass panel before taking pics - it'll help with image clarity and prevent certain reflections.
You must use an image hosting site, like imgur.com to post pics here.

 

[ASonic]

decided to sell the CPU after all, since the VRMs on the board can't handle it even without overclocking, no matter how cool I keep the CPU, there's a risk of ruining the mb..