Radeon 290 Lock-ups and Shut Downs - VRM Overtemp?

[Airjarhead]

OK, I've got a SigmaCool bracket installed on an AMD 290.
http://keplerdynamics.com/sigmacool/
The temps never go over 65C with my fan on low (45C on higher settings). I have heatsinks on the VRAM, but nothing on the VRM. I have a Noctua 140mm fan installed in the side of my case blowing on the card.
However, I keep getting shut downs during gaming.
I've tried running GPU-Z to see if I could nail down the issue.
The last time my PC shut down core temps are fine (61C). However VRM Sensor 1 was reporting temps of 102C! VRM Sensor 2 reported 60C.
There is no sensor for the VRAM, but the heatsinks get hot to the touch.
Does anyone know which sensor is 1 and which is 2?
Will theses copper heatsinks for the VRM help?
http://www.enzotechnology.com/mos-c1.htm


Thanks

 

[Brazman]

You really need sinks on the VRM's Mine run quite warm on my 290x (80C)under load even with a full cover block. VRM1 is the core (the long row of vrm's) VRM2 is memory.

 

[FR@NK]

Do you still have the stock cooler?

See if you can get the underplate on the card with the Sigma Cool adapter.

Like this but on a different card:

 

[erocker]

Yes, you need to actively cool the VRM's (not VRAM). Those enzotech sinks should help. Also, make sure you have airflow over them.

 

[Airjarhead]

Thanks for the replies. I rigged a fan inside the case to blow on the VRMs and they stay around 85C. The enzotechs should come in later this week.
On that subject, do I need to put heatsinks on every piece in that row, or just the larger ones?

 

[erocker]

Thanks for the replies. I rigged a fan inside the case to blow on the VRMs and they stay around 85C. The enzotechs should come in later this week.
On that subject, do I need to put heatsinks on every piece in that row, or just the larger ones?

Everything inside the red boxes:

 

[Airjarhead]

Guess I'm gonna need to order another package then...
Thanks