Tutorial: How to softmod to ANY VGPU you want without hardmods! (1.3~1.6v or more)

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Yes but what I've linked you to, is quite a big heatsink, with a big heat dissipation area and also you can mount it by using thermal paste, instead of the usual double sided sticky tape, that normal vrm/ram little heatsinks have. I assume you have the small heatsinks that came with your hr-03 gt

Oh, god, no. The Thermalright aluminum sinks that come with HR-03 GT are not that great, i used these nickle-plated copper Tweakmonster ramsinks on my VRMs and memory, they were also lapped with 600grit to even them out and then attached them with a very thin layer of Artic Alumina epoxy (permamently):

http://www.directron.com/silveramsinks4.html

http://www.directron.com/silveramsinks.html

Oh and my card doesn't do even 3900 mhz stable on the gddr5. It's "stuck" at 3800mhz.My ram is totally unoverclockable.

My results so far are identical to yours. Unfortunately, the 1GB models are not as good of an overclockers for memory, the 512MB ones fare better. If i dont touch the core at all my memory overclocks all the way to 1020Mhz. But since i wanted a balanced core/memory overclock i started off taking turns upping both by 5Mhz each time, right now i'm at 825/950 @ stock voltage but i dont think the memory will go much higher, may be another5-10Mhz.