I'm not a video care expert but I can tell you what my experience has been, for what it's worth.

I have edited numerous HD videos with my previous 5 year old desktop w/NVIDIA card using PD8 ULTRA with no hanging problems. I purchased a new computer w/Intel Core i7, 9 GB RAM, and ATI Radeon 5970 g-card. I installed PD9 Ultra at that time and have since had issues with PD9 hanging at various transitions while producing HD video. I have maintained toe latest ATI drivers installed. Unfortunately, I gave my old computer away so cannot do any test comparisons between ATI and NVIDIA. With PD9 build 2702, I could uncheck the Preferences>hardware coding box and stop the problem but resulting video was poor quality. I have now installed patch build 2930. I must still keep the hardware codeing box unchecked but video quality is very good.

I have noticed numerous posts at this site describing the same problems; from what I see the problems are more prevalent with ATI cards; those with upper end NVIDIA's do not appear to have the same issues.

Note: I have never had problems when editing stadard video whether the hardward coding box was checked or not; only issues with dealing with HD (mt2s). Hope this helps. Eugene88240

I have an ATI and no problems at all with it, but it is on the supported list. I don't know what the difference is since they use a common driver, but apparently it does matter. __________________________________
CORNBLOSSOM

For what it's worth, I also have an AMD processor, not Intel. I suggest that you download the trial version and see for yourself if it will work. that's the only way to know for sure. __________________________________
CORNBLOSSOM

I have a Radeon HD 5770 and have never had an issue with stalling, even when creating a 9 video TV wall with HD video.
Again, stalling with HD appears to be computer specific, as some editors have issues with Radeon and others do not, it seems to depend on your individual setup.

Robert Intel i7 930, 16GB ram, Radeon HD 5770 1Gb,Ver. 14.12 Win7 64 bit
Intel i7 7700 HQ, 16 GB ram Nvidia GTX 1050Ti 4GB dual drives 1 TB SSD + 1 TB HDD Win 10

PDtoots

If you go hunt Windows 7 drivers for Radeon video cards you will find a long list that does have the updated driver. The Radeon 5750, I believe is the card which doesn't have an updated driver. Very easy to pass over on card. I don't know the reason it hasn't been updated, but I spent the money to buy a nex PNY card and all issues went away. The only answer I ever received from CL tech was my video card driver was the problem. It fininally dawned me with the help of people here, what tech was telling me. Amature does it till he gets it right. A Pro does it till he can't get it wrong.

http://support.amd.com/us/gpudownload/windows/Pages/radeonaiw_vista64.aspx?type=2.4.1&product=2.4.1.3.43&lang=us&rev=&ostype=Windows%207%20-%2064-Bit%20Edition#1
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I have the ATI 5770 and AMD CPU.... I'm happy..... but I am also 32 bit and do not seem to have the issues the 64 bit users have.... I will wait a couple more years and try 64 bit again with Win 8... __________________________________________
Windows 8 Pro 64 bit

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**NOTICE**
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Hi,
I have the following set up and do not experience any problems at all.

Windows 7 Professional 64-bit (6.1, Build 7600)
VM Windows Professional XP
Processor: Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz (8 CPUs), ~2.8GHz
Memory: 8192MB RAM DDR3
Card name: ATI Radeon HD 5700 Series
Chip type: ATI display adapter 0x68B8
Motherboard ASUS P7P55D-E
1TG Hardrive