AMD FX8350 Strange temps

L

lucifercipher

New member
Hi guys,

I have a very very strange situation. I have this AMD FX8350, Corsair 650W 80% PSU, Dual ATI 7790 Xfired , Corsair Carbide 540 Series case http://www.corsair.com/en-us/carbide-series-air-540-high-airflow-atx-cube-case. First i used that big Jing cooler http://images.bit-tech.net/content_images/2011/03/thermaltake-jing-review/jing31280x1024.jpg and it was giving weird high temps upto 80Celcius. Now i changed it to Thermaltake Big Typ Revo http://www.thermaltake.com/db/imgs/pdt/angle/CLP0602_1bc3bf11c7dd449faa0a0134c5c473e7.jpg and the result is even more strange than before. The low temps go below 13C sometimes but high are over the line. I tried different type of good brand thermal pastes but still. Oh by the way, my motherboard is Gigabyte 990-FXZ-UD3. Please assist what could be wrong. This isn't my first build by the way.

My temps http://i.imgur.com/BJYds6g.jpg
 
core diferences in temps is often due to incorrect mounting. but for a primary core to be so low under load the only time i have seen that before is with a really hard ran c2q. it gave up on thermal reading and then had to depend on chip temps with a margin of +10c for cooling targets.

Not that familiar with the fx chips only ever had the 8120 which was a huge dissapointment.
But i would imagine its a combinatoion of temp sensor error + mounting pressure..

When you removed the 1st heat sink was the thermal paste evenly distributed?
Also are you using a solid plate heat sink or DHT..

at the risk of opening a whole can of worms right here..
My prefered method for thermal paste application for a flat based heatsink or a water block. is to make a X of thermal paste on the chip. You get used to how much you need to use after a while and i find it gets the best most even coverage.

with a DHT heat sink. i apply a generous ammount of thermal paste to the heat sink itself. then i spread it arround the heat sink. This finds its way in to all the little fissures between the heat pipes. then i scrape it using a credit card to clean off the heat pipes leaving only the thermal paste that is in the fissures behind.

i then find drawing 2 vertical lines on the cpu About 1/4 of the way in from the left and right side of the chip (1 line on the left 1 on the right) Again you get used to how much you need.
This is the best covarage and spread method i found with DHT heat sinks. "i personally do not like DHT heat sinks"

And of course mounting method is pretty importaint and i usually tighten the neat sink up 1 turn on each corner then repeat till it is at the optimal pressure. "bottom left>top right>bottom right>top left"

hope this helps but i would omagine its the sensor on the chip its self that is stuck.
 
Many thanks for the detailed reply. Oh boy. You had me thinking and i went inside the BIOS and saw CPU temp stuck at max 128 Degree C. Its a bad sensor somewhere. Currently, I use TG-4 paste by thermal take and spread it evenly by the pea method. Yes, the three coolers were nicely placed and the paste was spread evenly. I will open the board and look for the I/O chip causing this. I hope i am able to fix it.
 
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i hope you're using AMD Overdrive to monitor your temps....as its the only thing that gives you the correct temps for the FX line of processors
 
Its normal - that cooler just isnt up to dealing with the full load heat of your CPU

I overloaded an NH-D14 with one (metal actually got hot to touch) - sadly this is just a normal thing for those CPU's dude

If you want lower temps youll have to spend a good amount of money on decent cooling with one of the top class air coolers or a 240mm based AIO(all of these will require setting up you cant just plug and play and get the best from them)
 
Most air coolers can only let you get to 4.2ghz or so. I had a Scythe Ninja and I could only get to 4.2ghz using it.

As said you really need to use a good AIO on a FX 8. Something like H80 or H100 will allow you to reach high 4s.
 
You're using coolers that aren't really rated for that heat output it seems. As with all 8 core cpus, you have to tweak them. You can run an 8350 very happily on something like a hyper 212, as long as you spend time working out the lowest stable voltage. Dependant on motherboard, FX 8 cores sometimes run silly volts for no reason.
 
barnsley said:
You're using coolers that aren't really rated for that heat output it seems. As with all 8 core cpus, you have to tweak them. You can run an 8350 very happily on something like a hyper 212, as long as you spend time working out the lowest stable voltage. Dependant on motherboard, FX 8 cores sometimes run silly volts for no reason.
Click to expand...

The better the board the more the heat rises. Good boards have very good LLC meaning the CPU gets the voltage you specify all of the time. That means more heat.

I wouldn't say they're particularly hot at a max of 73c but they get there very fast due to the mass under the IHS. It's literally crammed corner to corner with modules.

Some of the air coolers I've used wouldn't even cover the die properly tbh. I think in honesty that's why AIOs work the best, as the block part is usually far bigger than the CPU. I think most air coolers are designed with Intel in mind and they then add the AMD bracket as an afterthought.

It's OK though, because cheaper 4 and 6 phase boards are only usually good for 4.2-4.4ghz any way so most air coolers are capable of that any way. If you're chasing 4.6ghz and above then you need an expensive board and may as well go expensive cooling too.

I had a H60 on my 8320 back when I first got it and there were certain levels of Crysis that my CPU would throttle on due to heat if I ran 4.4ghz. I had to wind it back to 4.2,

I was far more strapped for cash back then but managed to bag a H100 refurb for £40, which has been on it since. I can do 4.9ghz and just about scrape through Asus Realbench 2.0 with a max temp of 71c. Wind it back to 4.7 and I can get through all day long mid 60s.

I think a lot of people don't realise that just adding multi and volts is no way to clock these chips. Using the FSB comes with much higher clocks per volt, which means far lower overall temps.
 
Vault-Tec said:
...
Click to expand...
I've always gone by the recommendation that I've seen repeated a couple of times that the cpu doesn't go above 65-72c for large periods of time.

I never had thermal issues with my FX 8320 and seidon 120m. It'll comfortably sit at 1.4v (and more but I've never really wanted to see how far my archaic, ex b grade motherboard would go). I don't need to max the fans out.
 
barnsley said:
I've always gone by the recommendation that I've seen repeated a couple of times that the cpu doesn't go above 65-72c for large periods of time.

I never had thermal issues with my FX 8320 and seidon 120m. It'll comfortably sit at 1.4v (and more but I've never really wanted to see how far my archaic, ex b grade motherboard would go). I don't need to max the fans out.
Click to expand...

73c is where it ends for me. That's literally my tap out temp. Nothing else crashes the CPU but going over that temp.

I remember last summer when it was sodding hot sitting there watching my CPU go 71c....72c... LOL just sitting there with my fingers crossed praying it would make it through.
 
Thats truly shocking and very resourceful info you guys have put there. I was told by a guy today the same thing that the Big Type Revo cant handle the FX8350 processor as its a high TDP processor. What do you think about this ? http://www.thermaltakeusa.com/products-model.aspx?id=C_00002028 Will that do the job?

One question... why on earth will AMD ship its processors with that small stock cooler if a Thermaltake big Typ revo can't even handle it. Its also a down draft blower and better heat spreading . Is AMD trying to save up on the overall package costs???

Vault-Tec said:
73c is where it ends for me. That's literally my tap out temp. Nothing else crashes the CPU but going over that temp.

I remember last summer when it was sodding hot sitting there watching my CPU go 71c....72c... LOL just sitting there with my fingers crossed praying it would make it through.
Click to expand...

Surprisingly, I didnt shut down even at 80C during my VMWare sessions. It just starts throttling and goes to 1.4Ghz for a milisecond and tries to boost again at 4.2Ghz. So i know what you mean by keeping fingers crossed :)
 
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I've disabled throttling on mine it drove me nuts.

Ideally you want what AMD originally bundled with the chip and that's a H70 with a double thick 120 rad. Honestly I strongly suggest getting a 240mm rad AIO, especially if you have a board that can chase the big clocks.
 
Vault-Tec said:
I've disabled throttling on mine it drove me nuts.

Ideally you want what AMD originally bundled with the chip and that's a H70 with a double thick 120 rad. Honestly I strongly suggest getting a 240mm rad AIO, especially if you have a board that can chase the big clocks.
Click to expand...

The 120mm AIO from CM can actually keep the 9590 to 5Ghz, surpirsingly... but you know it gets really hot nevertheless. Idealy you would want a thick 280mm or a 360 rad for that thing.
 
I do not wish to OC. Just do BF4 and Car Cry 4 lately but i do a lot of C and VB coding on it not to mention some parallel tasks of Nessus and Metasploit stuff. What do you think about thermaltake Nic c4 for the stock bundle specs of FX 8350? As long as it can keep the CPU below 65 C then i would be really happy with it. Please advise.

Vault-Tec said:
I've disabled throttling on mine it drove me nuts.

Ideally you want what AMD originally bundled with the chip and that's a H70 with a double thick 120 rad. Honestly I strongly suggest getting a 240mm rad AIO, especially if you have a board that can chase the big clocks.
Click to expand...


Yes sir. I tried disabling the turbo and it just didnt feel right.
 
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Sorry man don't do air coolers and haven't since my NHD14 I won on here years ago.

I like access to my rig and they're just too intrusive, especially on the memory area.

The real bugger is no one even bothers to test any coolers on AMD any more so finding info and data can be hard.
 
Vault-Tec said:
Sorry man don't do air coolers and haven't since my NHD14 I won on here years ago.

I like access to my rig and they're just too intrusive, especially on the memory area.

The real bugger is no one even bothers to test any coolers on AMD any more so finding info and data can be hard.
Click to expand...


I just bought the big NIC4 cooler and revert. Hopefully my testing will help users in the future.
 
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