Urgent news, the reason you never noticed much of a difference with the new patch... is because the PATCH IS NOT ENABLED.
you have to manually set it up, here's how to do it:
Type in the console:
mat_forcemanagedtextureintohardware 1
Or make a new Cfg (or modify it) and add that same line.
i did it recently, thanks to browsing the Guru3D forums, it runs faster than before, i DO get stuttering, but i get MUCH less than before.
I posted it here as well as hardware & software, i figured in Half-life 2 Discussion, it would alot more attention.
I already sent news to the people at planethalflife.com, and will soon take over of spreading the news for me.
Got this from hl2 world, who got it from sven coop forums. He's right I did this and my fps went up from 20 to 40.