My Vreg was holding my OC back due to temps, at about 81 degreez under load at the above clocks. I modded my Vreg heatsink with the following method and recieved the highest of 61 degreez under load.
 
I removed the heatsink to find a very cheap thermal pad and then removed the 4 screws from the heatsink. Once this was done you are able to remove the cover plate the helps to hold the heatpipe assembly in place. This assembly is attached to the base, however not very well. There are a bunch of gaps as if it were just small circular globs of something. (not tim though) Anyways I appologies I dont have a pic of this, but if you do this mod you will see what I mean. I took some Artic Silver 5 I had laying around and filled the gaps the best I could on both sides to help with the heat transfer, then smoothed it.
 

 
After this was done just for a good measure I put a thin line of the Artic silver 5 across the top of the heat pipes before I mounted the Cover plate back onto the heatsink. (Since it was part of the unit, why not cant hurt)
 

 
Now that this is done you should have a beautiful shinny heatsink that is now a whole peice, with any gaps filled with TIM. I reapplied the stock thermal pad and mounted the heatsink to test for a temp difference. I found a 3 degree drop in temps from this alone. I then removed the heatsink again and replaced the thermal pad with some EK 10mm thermal pad material I had laying around.
 

 
The thin light grey strip is the stock thermal pad and the darker grey thermal pad is the EK material. I cut the EK pad the size of the stock pad and then placed the EK thermal pad strip on the Vreg's and installed the heatsinkagain for testing. I found I droped another 5 degrees by replacing the thermal pad to a better quaility thermal pad. After this I had a small I believe 80mm fan laying around that I placed ontop of the Vreg heatsink between the 2 heatpipes. (which fit nice and snug between them) I used a bit of clear 2 sided tape to mount the fan blowing down onto the heatsink and then tested this to find another 12 degreez shaved from my Vreg temps. ( I tested the fan blowing upward away from the heatsink and toward to find that toward the heatsink yeilded better temps)
 

 
The fan comes very close to my rear exhaust and may be the same for you, but it does not get in the way. I believe these pic's were taken with the fan placed so it would blow air away from the heatsink, but since then has been turn for the opposite.
 

 
Now I also have this fan connected to my fan controller and it is only turned up about half way due to the noise of the 80mm fan. I believe that at idle my vreg is like 48-49 degrees at these setting. When I crank the fan up to full unbarable speed (due to noise) my load drops another 6 degrees to 54 degrees and my idle at 38 degrees (sometimes lower) I dont have pics of this due the lack of me being lazy again, but you can try it for yourself. (the 80mm fan is a standard fan pulled from another BS computer and dont know the spec what so ever)
 
HOPE THIS WILL HELP YOU GUYS IN YOUR OVERCLOCKING ON THE E758 MOTHERBOARD

MrRiddler

woah, never a mod like this lol. Thanks for the tip.

What do you mean?

lol i was suppose to type, "Never seen a mod like this" lol my bad

Those tiny mosfet heatsinks rock on the bottom of the VReg baseplate. They can also be fit onto the NB one as well if you have some good steady hands ;) They seem to make the most difference and then when combined with a small fan...its as cool as you can get before going to water.

isn't the vreg bolted down to the mobo?  Why not use non-conductive tim instead of a pad?

also filling in the gaps seems like a good idea, but the tim will settle/dry out some and you might end up with air bubbles or smaller versions of the same gap after a month or so of heat cycling

Has anyone gotten Vreg down WITHOUT using an extra fan? (i.e. just reseating the heatsink?) I'm a quiet freak when it comes to computers, so I only try to do moderate overclocks with as few fans as possible.

TIM is a bit hard to apply due to the fact that the mosfets are very uneven. you would have to bend the HS to get that idea to work. the EK 1mm pad I used works great with the fan combo. 4ghz with no higher than 60 degrees on the vreg. works good. a fan on the vreg is a must.

Nereus
I like this idea and another someone posted recently, so I ordered some gear today and am going to combine these two ideas!

I will put new EK 1mm pad under the heatsink, unscrew the heatsink from the base mount and add tim in there, then add some small enzotech copper heatsinks to the top of the heatsink base (which will sit under the heatsink blades), and finally a high CFM Rexus 60mm fan on top. That should have some effect!

Thanks for the ideas!

BTW, doing both chopped over 10°C off my VReg temps.

lol Halloween, all you really need to do is replace the default thermal pad with the EK 1mm and you're good to go. The VReg heatsink comes with two pieces... the tall heatsink itself, and a long clip at the bottom to hold it in place. Put some AS5 between the heatsink and the clip and it should drop your temps by another couple degrees.
 
I also put 2 x 40mm fans on it, ziptied them together then ziptied them to the heatsink:
 

 

 
 

pics dont work lol