64-bit: integrated x87 and SSE2 units, later implementations extended to AVX2 and AVX512.32-bit: optional separate or integrated x87 FPU, integrated SSE units in later processors.The i686 subset of the x86 architecture is therefore fully open. The Pentium Pro processor (and NetBurst) has been on the market for more than 21 years and so cannot be subject to patent claims. For some advanced features, x86 may require license from Intel x86-64 may require an additional license from AMD. X87, IA-32, x86-64, x86-S, MMX, 3DNow!, SSE, MCA, ACPI, SSE2, NX bit, SMT, SSE3, SSSE3, SSE4, SSE4.2, AES-NI, CLMUL, RDRAND, SHA, MPX, SME, SGX, XOP, F16C, ADX, BMI, FMA, AVX, AVX2, AVX-VNNI, AVX512, AVX10, VT-x, VT-d, AMD-V, AMD-Vi, TSX, ASF, TXT, APX For the 32-bit generation of this architecture that is also referred to as "x86", see IA-32.ฤก978 (16-bit), 1985 (32-bit), 2003 (64-bit) This article is about the Intel microprocessor architecture in general.
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