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To run this version smoothly, your hardware needs to meet the baseline requirements. Remember, these are the minimums for the software to run; for optimal performance, always aim higher, especially for 3D work. These official requirements are broken down for the 64-bit version: AutoCAD 2013 English Win 64bit Exe
AMD Athlon 64, AMD Opteron, Intel Xeon with Intel EM64T support, or Intel Pentium 4 with Intel EM64T support. Do you need assistance to work with this specific version