AutoCad 2015 System Requirements :
Operating System : Microsoft® Windows® 8/8.1
Microsoft Windows 8/8.1 Pro
Microsoft Windows 8/8.1 Enterprise
Microsoft Windows 7 Enterprise
Microsoft Windows 7 Ultimate
Microsoft Windows 7 Professional
Microsoft Windows 7 Home Premium
Cpu : For 32-bit AutoCAD 2015:
32-bit Intel® Pentium® 4 or AMD Athlon™ Dual Core, 3.0 GHz or higher with SSE2 technology
For 64-bit AutoCAD 2015:
AMD Athlon 64 with SSE2 technology
AMD Opteron™ with SSE2 technology
Intel® Xeon® with Intel EM64T support with SSE2 technology
Intel Pentium 4 with Intel EM64T support with SSE2 technology
Ram : 2 GB ( 8 GB recommended)
Display Resolution : 1024x768 (1600x1050 or higher recommended) with True Color
Display Card : Windows display adapter capable of 1024x768 with True Color capabilities. DirectX® 9 or DirectX 11 compliant card recommended but not required.
Disk Space : 6 GB
.Net Framework : .NET Framework Version 4.5
Additional requirements for large datasets, point clouds, and 3D modeling
Cpu : Intel Pentium 4 processor or AMD Athlon, 3.0 GHz or higher with SSE2 technology; Intel or AMD Dual Core processor, 2.0 GHz or higher
Ram : 8 GB RAM or greater
Disk Space : 6 GB free hard disk available, not including installation requirements
Display Card : 1280x1024 True Color video display adapter 128 MB or greater, Pixel Shader 3.0 or greater, Direct3D®-capable workstation class graphics card