Cooling Mods for the HD 4850

So I've bought the HIS HD 4850 and stripped the stock cooler. This is what the card looks like without the cooler

http://www.ixbt.com/video3/images/ [...] -front.jpg

http://www.ixbt.com/video3/images/ [...] n-back.jpg

Now the aftermarket cooler I bought is working fairly well but as you all know, the 4850 runs very hot. With the stock cooler it would idle around 70c and at 80c+ on full load. Of course this was due in part to CCC not letting you control the fans, but even when you fixed that, the cooling wasn't much better.

Anyway, the cooler I bought was this.

http://www.newegg.com/Product/Prod [...] 6835191014

Now it idles at 40c and rarely hits 70c on full load. However, this is only with a mild 20-25% overclock.

Now it cools the GPU fairly well but the RAM heatsinks are rather cheap and I didn't even have enough. So I'm toying with the idea of buying a combination of new copper heatsinks and keeping some of the old ones.

The new heat sinks work on some of the RAM but there isn't enough clearance on others, Due to the cooler. Would the combination be a bad idea? Airflow is great in the case so I figure I just need a path for the heat to travel out to the air.

Also, what if I added heatsinks to the back of the card, right behind the GPU in order to cool further, since that gets hot as well. Would I have a problem with it getting fried? Any other cooling options and ideas?

The copper heatsink options I'm looking at are:


http://www.enzotechnology.com/mos-c1.htm

http://www.enzotechnology.com/bmr_c1.htm

http://www.enzotechnology.com/bcc9.htm

Ummm a %20-25 overclock is actually quite far say 4870 level the most I have reached is 765, 2400 and that was only for A couple of minutes are you saying you run your card all the time at 750+ ecause theres not much wrong if thats what youre doing. Also if you read reviews of the cooler, people are saying that the TIM is crap so buy some Arctic 9

Ok well either way, I still need to get some more heatsinks. My main questions is on the placement. Can I mix and match different heatsinks on the same card due to the clearance height of the cooler? Also, judging by the scan of the back of my card, is there anywhere I can place heatsinks to further cool the gpu because the back gets hot as well. I know it will work, it all depends on where I can place them.