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This article presents experimental results of cooperation between wireless IEEE 802.11 a/b/g cards coming from different vendors, working in ad-hoc mode. The throughput efficiency of each of the cards was analysed in two different configuration scenarios consisting of two or three cards working together. Emphasis was put on the multirate adaptation abilities of the cards, which utilize such modulation techniques as DBPSK, DQPSK, CCK, and OFDM. The achieved results, presented in the form of figures, show that cards manufactured by independent vendors perform differently. Therefore, choosing the optimum configuration, according to the user’s requirements, is possible.