Hi gubak,
I don't know why you created a thread with 3 exclaimation marks when new (or a rare guest) on the forum and without researching the topic first. Anyway, I welcome you to the forum
As for your thread's topic: This was fully addressed by Pentax in a firmware release last week (1.01) and now the K-5 has the largest buffer limit among the direct competition.
I.e., it now bursts about 25 raw images or 35 JPG images (up to 44 actually) before slowing down at 7 fps.
That's actually beating both D7000 and 7D which only burst up to about 15 raw images in full speed (6 and 8 fps resp.).
The corresponding threads can be accessed via this link:
https://www.pentaxforums.com/forums/pentax-k-5-forum/123033-quick-test-contin...re-1-01-a.html
P.S.
I don't think the poster is actually a K-5 owner as otherwise, he would have known. The thread should be closed maybe as it is a duplicate and the title is misleading.