You haven't provided any evidence that this is not correct. I said that as far as I am aware, all x86 CPUs which support NX also support SSE2. The Northwood range of Pentium 4 processors in particular were extremely popular and sold strongly. I'd wager it's a lot more than you think. That therefore means that Brandon is referring to the more modern form of NX and as such the information he has provided is verifiably false.Īs for how many are still in use. Given how far back Segment based NX goes there's a 0% chance the Windows 8 installer can be referencing it, as even absolutely ancient CPU's supported it. In terms of any form of useful functionality software NX has only been available since Windows XP SP2 and hardware based NX has only been available in a usable form since the Pentium 4 models I already mentioned, and AMD Athlon 64 CPU's. NX as we see it today is known as the 'flat memory model' and this is the only form of NX that all modern operating systems support, and that is the version that I was referring to. However neither old nor modern versions of Windows ever had support for segment based NX. Well technically that is true if you count Segment level NX which has been included in Intel CPU's since the 80286. Everything that supports NX also supports SSE2.

Pae nx and sse2