When it comes to computing capacity for public cloud services, Amazon and Microsoft are dominating the pack. According to research firm Gartner, Google is the third in this cloud race. The conclusion comes as Gartner looks into Magic Quadrant's annual report surveys, which estimates the amount and type of cloud computing services offered for rent by big companies. Fortune reports: Amazon's continued strength will not surprise many considering the resources it has poured into this now-$10-plus billion a year business. AWS "has the largest share of compute capacity in use by paying customers -- many times the aggregate size of all other providers in the market," according to the report. Last year, Gartner's take was that AWS ran more than 10 times the cloud compute capacity as the next 14 cloud players combined. Asked whether that means Amazon's dominance has held steady, grown, or decreased year over year, Gartner managing vice president Rakesh Kumar told Fortune the research firm does not have the exact comparable figure, but that it is "reasonable to assume" that AWS has maintained the same lead this year. The odd man out here appears to be Google, which has been trying hard to win market share from the other two powers and to prove that it is serious about the public cloud market. Google remains the third largest player by Gartner's measures, but it has slipped a bit relative to the top two.