Question about ‘HotSpot’/’Junction’ Temperature.

1 : Anonymous2021/10/05 09:35 ID: q1sxbj

Hello guys! My question is simple, but the answer may be somehow not easy.

What's a good hot spot or junction temperature? Or, better, what is a good delta between the GPU 'Edge' temperature and the junction temperature? 10°/15°/20°C?

Let's say my GPU runs Superposition benchmark 1080p extreme at 64° max temp but the hot spot is 81°C. Is that a good delta for instance? I understand "the lower, the better" but I'm looking for a more wide vision ahah.


2 : Anonymous2021/10/05 13:17 ID: hfh4t3p

It always depends on how many Watts you are pumping into the chip and what cooling solution you're using. For Vega 56's stock 180W with an aftermarket cooler, the delta would be somewhat poor, whereas for 220W-260W it would be OK to pretty good.

Anyhow, an absolute hot spot temp of 81°C is nothing to worry about.

ID: hfh4u4v
81°C is equivalent to 177°F, which is 354K.

I'm a bot that converts temperature between two units humans can understand, then convert it to Kelvin for bots and physicists to understand

ID: hfh5vj4

Bad bot! I hadn't asked for a conversion, as degrees Celsius is the international standard for specifying hardware temperatures.

JK, you're still a good boy.

3 : Anonymous2021/10/05 10:11 ID: hfgnllk

It depends on the model. At Computerbase they have data for a few 6800 series cards and 15-20° seems typical at stock settings (a bit higher for the non-XT models):

ID: hfgz7zs

damn my 6800 has like a 35 junction and core temp difference. time to RMA?

ID: hfh33jb

Yes, you have to RMA immediately or it will explode and kill your cat.

ID: hfh4z1c

What's the absolute value of the junction temp? Anything below 95-100°C should be fine at this time of the year, but you'd probably want a bit more headroom as to never hit 105°C junction during a hot summer day (as this leads to thermal throtteling and a performance loss).

ID: hfha1r7

Which particular model do you have? Some cooler designs have better pressure distribution, some worse.

4 : Anonymous2021/10/05 13:20 ID: hfh56m5

As long as the card isn't throttling under load and tanking performance then it doesn't really matter that much. My Vega 64 would always be up in the 100c range for the hotspot unless I adjusted the fan profile. So it would have been around 20c difference. Radeon VII on water was usually below 20c difference but not with the stock air cooler. If it's below 100c while under load for a good amount of time then I wouldn't even worry or consider doing anything to the card.

5 : Anonymous2021/10/05 16:23 ID: hfhu871

The delta widens as the card gets hotter especially if you overclock. It's not unusual to have a delta of 30C with a significant overclock. Hot spot could hit 100C while edge temp is still 70C. Otherwise, at stock, 15-20C delta is typical.

6 : Anonymous2021/10/05 19:57 ID: hfip21i

10-25°C is a good delta. If you're at 30°C or more delta with average everyday gaming use, then you likely have an uneven/too light mounting pressure problem on the die itself, or the thermal pad arrangement is causing some sort of issue.

Both of these problems can be fixed DIY if you're comfortable with it, otherwise RMA if the temperature makes you antsy, and explain the problem in detail.

Having said that, your GPU won't start thermal throttling until it hits 101°C, with the absolute max being 110°C.

If you're overclocking, you can throw all these guidelines out the window. More power = more heat. Generally speaking, you want to offer the most power you can while overclocking, and dial down the voltage as far as you can to control temperature... All while keeping operation stable.

ID: hfip35l
30°C is equivalent to 86°F, which is 303K.

I'm a bot that converts temperature between two units humans can understand, then convert it to Kelvin for bots and physicists to understand

7 : Anonymous2021/10/05 09:38 ID: hfglfl3

This is fine.


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