8.1 x64 drops A64 and 90nm P4 support. A64 lacks CMPXCHG16 which is why Windows is limited to 8TB of address space. NSA couldn't wait for Win9 so we get that breaking change now⸮ The P4 is more interesting though. MS's 64bit compiler emits a 3DNow! instruction. MS had to trap this instruction for Intel. Cedar Mill NOPs it and Broadwell will support it.
Windows 8
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They're fast because they wiped all of the malware and "free games" off of them. Give em a few months.
AMD Threadripper Pro 5975WX PBO+200 | Asrock WRX80 Creator | NVIDIA GeForce RTX 4090 FE | 64GB DDR4-3600 Octo-Channel | Windows 11 23H1 | (details)
MacBook Pro 14in | M1 Max (32 GPU Cores) | 64GB LPDDR5 6400 | macOS 12
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