HW acceleration problem with ATI cards

Hello all. This is my first post here
I have noticed the following issue/problem and would like your feedback about it.
We have a lot of intel macs here at the office (15 macs).
Most of them are intel imacs using ATI graphics.
We also have an intel macmini with a nvidia 9400 graphics card, a macbook pro 17inch, core 2 duo with nvidia graphics etc.
My personal macs are:
1) a macpro 1.1 (upgraded to 2.1) with (upgraded) 2 x5365 xeon cpus @ 3ghz (8 core machine), 10GB ram, ΑΤΙ HD 4870 1GB, INTEL 80GB G2 SSD ...
2) an imac 2.93Ghz i7 27inch, with 16GB RAM and an ATI 5xxx card (i do not remember the exact model, i think it is the 5770 card as a successor to the 4850 card).
I have noticed the following issue on ALL the macs i have access to: whichever mac runs nvidia card, irrespective of the specification of both the nvidia card and its cpu, has hw acceleration working properly when browsing the web.
For example, if i visit these links:
http://demos.hacks.mozilla.org/openweb/HWACCEL/
http://ie.microsoft.com/testdrive/Default.html
and i run the respective test on any of the macs we have here equipped with an ATI card i get slow frame rates, ie. on my macpro, with a dual monitor setup 2560x1600 (apple 30inch) and 1680x1050 (apple cinema display) i get 20s FPS when running the tests and this is only when using safari.
The same applies when running these tests on my imac i7 as well as on all other macs that are running ATI hardware.
On the contrary if i run the tests on a mac which is equipped with a nvidia card i get (depending on how old the hardware is) 50+ or even 60+ FPS.
I do know that things are complicated with hw acceleration on OS X Lion and in particular when browsing the internet (partially working hw acceleration) but why the difference between ATI and NVIDIA?
All drivers .kext files are original and not patched.
When running benchmarks, the results appear on par with similar systems.
Of course all of our macs are running OS X Lion, latest version with latest updates installed.
Also cleared safari cache (by manually deleting the cache.db file as well), disabled all of the plug-ins, installed latest version of adobe flash, to no avail.
I just want to know why there is different hw acceleration behaviour when running a NVIDIA instead of an ATI card on OS X LION.
From a practical perspective i think this is why sometimes when i browse the web i have excessively cpu utilization even on powerful systems (i7, 8core macpro etc) running ATI hardware.
Please excuse my English, it is not my main language

UPDATE:
After reading here http://betanews.com/2012/02/10/google-releases-chrome-18-beta-get-it-now/
i just tried the Google Chrome Beta v 18.0.1025.11 and i saw a dramatic difference. On a 2560x1600 screen i am now getting on this test (http://demos.hacks.mozilla.org/openweb/HWACCEL/ ) approximately 40+ FPS. Nevertheless my question still stands: why people with NVIDIA cards on a mac do not have this problem?

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