So, I conducted a lot of searches on watercooling the 7870 Myst or XT. There are no full waterblocks that I could find. Anyway, Swiftech suggests that universal blocks are better for a number of reasons so I felt the investment was worth it for this card. Since I am using a new 2012 EK design, my hope is that it will last for many cards. So I justified the cost by dividing the investment by 4.
Since I wanted a modern design, I went with the EK - HWBOT http://www.performance-pcs.com/catalog/index.php?main_page=product_info&products_id=36951
. To use any EK block with any Tahiti card you need to use the 7970 copper shim. I was initially fooled because the mount surface is bowed or convex. You get contact but the closed thumbscrews prevent the block from lowering to the gpu completely and surrounding riser. ( Just to be clear the gpu and riser are at the same level, look at your removed stock heatsink to confirm. But with EK your are screwed by the closed thumbscrews. Maybe the standard Swiftech 82 would fit better but I don't know its mounting idiosyncrasies.)
You need to heatsink the VRMs and RAM if you go with a universal block. I used Enzotech BCC9 for the RAM (the 9mm height does not impede my Bitspower barbs. I used two Swiftech MC21 Mosfet heatsinks for the 4 uncovered VRMs on the right side of the card. I used one Enzotech MOS-C1 on the powersystem controller APW7165C. The VRMs I put heatsinks on are 4935N, 4927N,4925N, and 4983NF. (The VRMs on the left side of the card, under the long, silver heatsink I did not touch.)
I installed a different VGA I/O bracket on the card that Is made by EK http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=60_237_1170&products_id=33467
. This results in the card only taking one slot. I can now use the other slot for my cool fan device.
I am using a Titan TTC-SC07TZ (RB) Z-AXIS VGA Cooler http://www.newegg.com/Product/Product.aspx?Item=N82E16835192026
. I bought it at Newegg. You can swap out the fans and I did; I used 2 AKUST FANMOD 95 fans http://www.performance-pcs.com/catalog/index.php?main_page=product_info&products_id=25986
that are 95cm diameter but occupy only 90cm space. Their airflow is 40.54cfm at 24.58 db and run at 2,000 rpm max. The Titan card has a fan controller so you can regulate airflow.
Here are some photos:Edited by Bluesman - 4/11/13 at 9:20pm