According to Jack Keller: Montrachet : Perhaps the most popular yeast used. It is available for both red and white wine fermentations and may be called Montrachet Red and Montrachet White. It works especially well in producing Chardonnay in barrel and stainless steel. It also tolerates sulfur dioxide well, but does not work well with high sugar levels (more than 23.5 Brix). It is this ineffectiveness in high sugar levels that is most likely responsible for many stuck fermentations. Temperature range is 59-86°, low flocculation, and alcohol is pretty reliable at 13%.
You may find Keller's site useful: Winemaking: Strains of Wine Yeast