Your planning on putting a GPU waterblock on a CPU later on?
You can get hard setting thermal paste and use it too glue small heatsinks onto the memory.
edit: I mean your planning on putting a CPU waterblock onto a GPU?
edit 2: something like this.
http://www.ebay.com/itm/8x-Mini-Copper-Memory-Heat-Sink-RAM-heatsink-Cooler-Cooling-for-laptop-Computer-/121347215896
http://www.ebay.com/itm/8pcs-Lot-Micro-Small-Aluminum-Heatsink-For-XBOX360-PS-Computer-VGA-IC-Cooling-/191459271874?pt=LH_DefaultDomain_0&hash=item2c93dca4c2
http://www.ebay.com/itm/8PCS-Aluminum-IC-PC-VGA-Card-Xbox360-PS-DDR-RAM-Memory-Cooling-Cooler-Heatsinks/371111197051?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20131003132420%26meid%3D2f80e13ef95c46c3bd8bcadbf13d64ae%26pid%3D100005%26rk%3D3%26rkt%3D6%26sd%3D191459271874&rt=nc