Neither, they are marketing gimics, don't spend 100% more to get a 30%(at the very best) performance gain, just doesn't make sence do it. Don't choice a card because of these technologies but the performance behind the single card. Maybe in a year or 2 when the technologies perfect themselves, or if they ever do, but till then just ignore that xfire and SLI even exist.
The new line of graphics card will be released at the end of may beginning of June high end being named 2900xtx and the budget being the 2600 series.
Nvidia will be releasing their products shortly, but I find it hard to recommend a product that hasn't be released yet, I'd recommend waiting a seeing what they can prove, it'll also drive prices of cards such as these down, the main reason why I suggest waiting.
Edited by james_8970, 07 April 2007 - 12:24 AM.