CPmee how does one go about doing the bar mod for the VRM sinks? I am definitely interested in anything that can reduce my temps even the tiniest bits. Not that it's too hot. But I am always interested in less heat.
Yep, same here. And it could help if my back fan died and I didnt notice it for a while.
Heres a picture of the backside area and chips of the M5A99 boards. (interesting to note that the M5A97 boards dont have those chips. And that the M5A97 LE board doesnt even have that left pin hole)
For relative sizing, the cpu backplate clip holder is 4 3/8" long by 2 7/16" wide by a little over 1/8" (.14" thick at its widest). The square hole in the middle is approx 1" X 1". The push pin vrm heatsink holder holes, marked by the red arrows, are about 1/8th inch in diameter.
This is how I would do it IF I DIDNT HAVE A CASE WITH A BACKPLANE HOLE IN IT. In other words, similar to how Asus has done it.
Acquire a 5 inch piece of 1/6th thick aluminum bar, from 1/2" to 3/4" wide (it looks like Asus used about 1/2").
You dont want to disturb the vrm heatsink thermal pads, so I would hold down the vrm heatsink on the front with one hand while with the other hand with needle nose pliers pinch and push up the ends of the plastic push pins ends on the backside and take the pins out.
I would then take the cut aluminum bar, center and line it up so that no high solder component tips touch the bar.
Then I would take a black fine tip magic marker and from the front mark where the holes need to be drilled in the bar.
I would then drill the holes and lap the bar so thats its flat and smooth.
I would apply teeny tiny dots of my favorite non conductive thermal paste to the center tops of each of those 8 chips.
I would use small nuts and bolts, with the head on the backside (counter sinking them slightly if need be), to hold both the vrm heatsink and the aluminum bar instead of the original plastic push pins. (It looks like Asus used rivets or threaded the bar on the Sabertooth and Crosshair models) Or since I already have the tools to do so, I might thread the bar and use very short bolts.
Since I do have a case with a backplane area hole in it, I may use thicker aluminum bar or even an aluminum strip with fins on it chopped up from an old heatsink, once I figure out clearances.
I have lots of different size aluminum bar material, so its no cost and no problemo for me. For those that dont, sources are hardware stores or home centers or hobby stores. Also, cheap aluminum rulers could be a source. Flat aluminum bar material of this short length and size isnt all that hard to find. For example, it may be on a hinge of an aluminum folding chair that needs to be scrapped.
Electrical supply places may even carry copper bar at these sizes, but I wouldnt layout much for this mod. If you want top heat conducting then layout for silver bar, heh. (probably be less than $75)Edited by cpmee - 4/14/14 at 3:32am