I was browsing cards yesterday and I noticed the HIS brand... I've never heard of them before so I wasn't sure on their quality. Personally every ATI card I buy, I buy the ones built by ATI. The only exception was my last card which was a Powercolor X800 GTO, upgraded it to a X1900XTX
From what I understand
PRO < XTX
Pro was used a lot in the pre Xxxxx cards (i.e. 9500 Pro, 9550, 9600, 9600 pro, 9700, 9700pro, 9800, 9800 pro)
Also you must have a crossfire edition card to be able to run in crossfire (ATI's equivalent of SLI). I remember needing to have a master and slave card with an external dongle... but I belive with the advent of the X1950 Pro, ATI is re-doing Crossfire.
They really aren't much different. Just get the cheapest one. Also, remember, sapphire are just like the ATi reference boards 'cept cheaper and they have a pretty sticker. with 1950xtx cards, there is no performance difference between manufacturers.
X1950 XTX & crossfire are different to a 1950pro, 2 different core designs used...
1950pro is newer tech & uses a new design for crossfire mode, the other 2 cards use an external cable & needs a mastercard/slave configuration., The pro has no mastercard, all you need to 2 cards & link them together
if you want a order, x1950xtx => x1950crossfire > x1950pro
Yea from what I understand on ATI's new chipset they are making crossfire more or less like SLI. Eliminating the dongle... (i just think it's funny saying that) and using not 1 but 2 little switch jobby's on the motherboard. I can't remember exactly why but it has to do more or less with Quad Crossfire
instead of just spouting off "I guess" or "more or less" I'll just point you to the article I read: