Northbridge overheating because of the GPU

[zero00beat]

So i have the Asus M5A78L-M LX V2 motherboard and recently ever since i installed my Asus r9 290 iv experienced pc crashes, in my event viewer the cause is the northbridge so i took my case lid off and felt the northbridge heatsink and it was very very hot. I replaced the thermal paste in my northbridge and i still experienced crashes. The heat i believe is coming from the r9 290s backplate while gaming it is very hot and it rises to the northbridge.

Today i also applied new thermal paste to the southbridge heatsink
right now im testing my pc with prime 95 for a couple of hours to see if my pc crashes or if the north bridge gets very very hot if it doesn't i know the cause is the gpu. Is there anyway to cool down the northbridge one of my ideas has been to use a pcie extender and move my gpu to a different position somewhere else or to install a 40mm fan on the heatsink itself or more case fans.

Pictures of my case i have one stock fan in taking then one aftermarket outtaking the gpu which is under the north bridge heatsink has two intake fans and my hyper evo 212 has one intake.
http://gyazo.com/c70392a3a48c2699c588705a34037247

this is surely a motherboard or gpu problem the rest of my computer runs fine my psu is more than enough so dont ask.

A fatal hardware error has occurred. EVENT 20

Component: AMD Northbridge
Error Source: Machine Check Exception
Error Type: HyperTransport Watchdog Timeout Error
Processor ID: 0

The details view of this entry contains further information.

 

[vrumor]

So, you change to a more powerful video card, im assuming its more powerful than the one you had before. The PC starts crashing, but it cant possibly be the PSU? What is your PSU? I havent heard of a northbridge or southbridge chip overheating for quite some time due to the heat pipes and what not on modern motherboards. But there was another thread last week someone had that timeout error, did you search the forums here?

 

[zero00beat]

The psu is surely strong enough iv ran a stress test for two hours without a crash my northbridge was warm so i do belive my gpus heat is causing this issue il keep stress testing the whole night if no crash occurs its definitely the gpus heat or the gpu.

 

[zero00beat]

So, you change to a more powerful video card, im assuming its more powerful than the one you had before. The PC starts crashing, but it cant possibly be the PSU? What is your PSU? I havent heard of a northbridge or southbridge chip overheating for quite some time due to the heat pipes and what not on modern motherboards. But there was another thread last week someone had that timeout error, did you search the forums here?

Yes before i had a 7870 which barely formed heat. My PSU is http://www.pccasegear.com/index.php?main_page=product_i.... And i looked up some research alot of people suggested it could be the Northbridge overheating and i recently touched it while having no gpu mounted and it was pretty cool compared to when the gpu is in i couldnt touch my finger on the heatsink for more than 5 seconds when the gpu was stressing.

 

[Piggystriker2]

I have this problem too, may i ask how you fixed it in the end as my r9 290 is pretty useless to me, as i boot up and in about 5 mins it reboots because of my northbridge overheating so now its out it also gets very hot but no shut down its a bit weird any help is appreciated thanks.