High CPU temperature on R7000?

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lolcocks
DD-WRT User


Joined: 31 May 2013
Posts: 137

PostPosted: Tue Feb 26, 2019 19:24    Post subject: High CPU temperature on R7000? Reply with quote
Hello,

I got a used R7000 and for some reason it's running on really high temperatures.

I let the router cool down to 20°C which is the room temperature.

I plugged it in and the temperature in DD-WRT is 30°C.

5 minutes later it's 35°C.

20 minutes later it's 45°C.

1 hour later it's 61.9°C.

1 hour 10 minutes later it's 62.5°C.

This stops until it reaches 70°C.

Why is this happening? I have even disabled 5 GHz WiFi. Only 4 devices connected to WiFi.

And I did this testing at night when everyone was asleep. So there was no usage.

I am running "DD-WRT v3.0-r38580M kongac (02/05/19)"
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Alozaros
DD-WRT Guru


Joined: 16 Nov 2015
Posts: 6407
Location: UK, London, just across the river..

PostPosted: Tue Feb 26, 2019 21:12    Post subject: Reply with quote
does your cat sleeps on the router ??? Razz

i guess this is normal temp, of course you can open it and improve heat sink or there are some ideas with
cooling fans and ect... mine stands vertical and its fine but here is a winter now..summer time i've seen it like 60C ish but never been concerned...

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Atheros
TP-Link WR740Nv1 ---DD-WRT 55179 WAP
TP-Link WR1043NDv2 -DD-WRT 55303 Gateway/DoT,Forced DNS,Ad-Block,Firewall,x4VLAN,VPN
TP-Link WR1043NDv2 -Gargoyle OS 1.15.x AP,DNS,QoS,Quotas
Qualcomm-Atheros
Netgear XR500 --DD-WRT 55460 Gateway/DoH,Forced DNS,AP Isolation,4VLAN,Ad-Block,Firewall,Vanilla
Netgear R7800 --DD-WRT 55460 Gateway/DoT,AD-Block,Forced DNS,AP&Net Isolation,x3VLAN,Firewall,Vanilla
Netgear R9000 --DD-WRT 55363 Gateway/DoT,AD-Block,AP Isolation,Firewall,Forced DNS,x2VLAN,Vanilla
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Netgear R7000 --DD-WRT 55460 Gateway/SmartDNS/DoH,AD-Block,Firewall,Forced DNS,x3VLAN,VPN
NOT USING 5Ghz ANYWHERE
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smask
DD-WRT Novice


Joined: 28 Jan 2016
Posts: 48
Location: The sofa

PostPosted: Tue Feb 26, 2019 21:19    Post subject: Reply with quote
70°C, that's not exceedingly hot. When I flashed mine to r38570, I logged it at 66.7°C and this was when it were situated in a wardrobe together with a NAS and a laser printer.

In the attic where it sits now, it register at 59.9°C.

DD-WRT runs everything thru the CPU as BS and Kong doesn't have access to propriety hardware more than the occasional binary blob.

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R6800 BS K4.4 r46329 (Main router)
WNDR3700v3 r40009 (WAP)
--- Spares ---
R7500 Stock FW (Found it at the city dump alongside a EX7000)
WNDR4300 BS K3.18 r40559 (Flaky ethernet ports)
R7000 BS K4.4 r40750 (Dead ethernet ports, cooked to death in the attic a really hot summers day, about 105-110C)
WNDR4000 BS K3.10 r31899 (Loaned out to tenant who lives in my old home)
WNR2000v2 BS K2.6 r39230 (bricks and giggles)
+ A bunch of WRT54GL:s

I use my routers with pretty basic configuration. Only having WiFi + BT coexist enabled.
I don't have any USB devices connected.
lolcocks
DD-WRT User


Joined: 31 May 2013
Posts: 137

PostPosted: Wed Feb 27, 2019 1:37    Post subject: Reply with quote
Alozaros wrote:
does your cat sleeps on the router ??? Razz

i guess this is normal temp, of course you can open it and improve heat sink or there are some ideas with
cooling fans and ect... mine stands vertical and its fine but here is a winter now..summer time i've seen it like 60C ish but never been concerned...



smask wrote:
70°C, that's not exceedingly hot. When I flashed mine to r38570, I logged it at 66.7°C and this was when it were situated in a wardrobe together with a NAS and a laser printer.

In the attic where it sits now, it register at 59.9°C.

DD-WRT runs everything thru the CPU as BS and Kong doesn't have access to propriety hardware more than the occasional binary blob.



I see... thank you.

Though, I will say that the Netgear firmware was running way hotter. It doesn't show the temperature but just by touching the upper plastic I would say the CPU was about 80°C
SinCalChewy
DD-WRT User


Joined: 09 Nov 2014
Posts: 314
Location: Bakersfield, CA

PostPosted: Fri Mar 01, 2019 19:39    Post subject: Reply with quote
Both of mine are overclocked at 1200,800 and stay around 70°C on the normal, and they're both sitting on top of a mini-fridge, meaning it's cold so they do have some cooling from the fridge. *shrug* FWIW

It's at "CPU 66.9 °C" right now with many wireless on both channels on my gateway. So I'd say 70°C isn't gonna kill your router. :)

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<Kong>
DD-WRT Guru


Joined: 15 Dec 2010
Posts: 4339
Location: Germany

PostPosted: Sat Mar 02, 2019 10:18    Post subject: Re: High CPU temperature on R7000? Reply with quote
lolcocks wrote:
Hello,

I got a used R7000 and for some reason it's running on really high temperatures.

I let the router cool down to 20°C which is the room temperature.

I plugged it in and the temperature in DD-WRT is 30°C.

5 minutes later it's 35°C.

20 minutes later it's 45°C.

1 hour later it's 61.9°C.

1 hour 10 minutes later it's 62.5°C.

This stops until it reaches 70°C.

Why is this happening? I have even disabled 5 GHz WiFi. Only 4 devices connected to WiFi.

And I did this testing at night when everyone was asleep. So there was no usage.

I am running "DD-WRT v3.0-r38580M kongac (02/05/19)"


70° is the normal temp, the newer R7000 revisions have a slightly modified heatsink, which gives around 65° normal temp. The same cpu runs at 80° to 90° in other manufacturer models. e.g. d-link.

I even had the 6200 units running at around 100° for longer time without any issues. The cpu takes it but other components usually fail under such conditions, e.g. capacitors.

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sape
DD-WRT Novice


Joined: 06 Oct 2021
Posts: 2

PostPosted: Wed Oct 06, 2021 5:17    Post subject: Re: High CPU temperature on R7000? Reply with quote
Sharing my experiences living in tropical climate (say 30C average ambient room temperature):
- my R7000 used to run at 77C CPU placed on top of a cupboard, no coverage either on the sides or above - running a few months old DD-WRT as router and AP (both 2.4 and 5GHz), serving DHCP and proxying DNS, but no CPU intensive functions like VPN (22% CPU load average, no overclocking: at 1000 MHz)
- based on the recommendations here I raised the unit putting four duplo blocks Smile under its feet to enable airflow underneath: this reduced the long running temperature to about 72C
- also based on recommendations I have purchased an AC infinity multifan S3 (120mm) with rubber feet. After placing the unit on the powered fan (set to "medium" speed) the long running CPU temperature was reduced to 63C (wifi chips: WL0 49C, WL1 52C).

I am planning to set up more CPU hungry functions and see if I:
- run out of CPU capacity and need to overclock
- need to further my thermal enhancements by replacing the thermal pad too. Smile
hurleyp
DD-WRT User


Joined: 10 Sep 2009
Posts: 425
Location: Ottawa, Ontario, Canada

PostPosted: Wed Oct 06, 2021 12:58    Post subject: Reply with quote
My R7000 is wall mounted in a utility closet, and the CPU temperatures are generally in the low 60's °C. It seems the airflow through the router is a bit better if you can place your R7000 vertically instead of horizontally.
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Netgear R7000: v3.0-r54248 std (11/29/23)
EdgeRouter-X: EdgeOS v2.0.9-hotfix 7
the-joker
DD-WRT Developer/Maintainer


Joined: 31 Jul 2021
Posts: 2146
Location: All over YOUR webs

PostPosted: Thu Oct 07, 2021 9:25    Post subject: Reply with quote
Please check this out.

https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1244888#1244888

No routers were harmed in that process, but Im not responsible for any drowned kittens or killed babies or houses going up in flames.

Instructions on how to get the right gpio port are on there.

Fans not included.

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kernel-panic69
DD-WRT Guru


Joined: 08 May 2018
Posts: 14125
Location: Texas, USA

PostPosted: Thu Oct 07, 2021 13:07    Post subject: Reply with quote
You can mount the "wedge" R-series vertically and it does help - so does using spacers underneath (as well as offset mounting vertically); The problem is the bleepin' RF shields allowing no heatsink(s) and non-optimal airflow design. If you're that worried about it, get a 120mm usb-powered fan, mark and dremel out a hole and add holes for mounting screws to the top cover and mount it so it draws air out of the case and call it a day. No need for temperature control. But seriously, the spec for these chips, running a constant 70 deg. C is not the end of the world.
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