Advanced Micro Devices said it expects to solve supply issues with some of its desktop processors by the first quarter. The Sunnyvale, Calif., chip maker sent a letter to some of its partners stating that several of its desktop processor models were in high demand and would continue to be difficult to obtain, said two systems builder who asked to remain anonymous. One of those systems builder said the note specified the Athlon 64 3500, 3800, the dual-core X2 3800 as well as the lower end Sempron 2600 and 2800 as being in tight supply.