Your better off having the sinks. They move the heat down away from the chips.
Printable View
Yes, that will work. The mounting orientation of the holes on the 4870 and 5870 are the same.
The smalls sinks are these here -
http://www.chilledpc.co.uk/shop/prod...4ae67e16f537b7
If you have airflow you dont NEED the sinks. I prefer to add them though.
I bought couple sets of these ... that should do the job:
LINK CLICK HERE
just did mine as well :)
took the plunge ... I love WCing so stuff it :)
temps dropped by 35C :) very happy
http://img21.imageshack.us/img21/5875/img3599vd.th.jpg
http://img252.imageshack.us/img252/7500/img3607.th.jpg
http://img9.imageshack.us/img9/516/img3605vp.th.jpg
http://img25.imageshack.us/img25/7536/img3613gr.th.jpg
http://img21.imageshack.us/img21/8705/img3614l.th.jpg
http://img25.imageshack.us/img25/3767/img3615o.th.jpg
http://img10.imageshack.us/img10/6708/img3616iz.th.jpg
http://img22.imageshack.us/img22/9493/img3617k.th.jpg
http://img22.imageshack.us/img22/5025/img3619j.th.jpg