^Incorrect. XP has inferior multicore CPU support - compared to Win7 it lacks pervasive prefetching, an improved DLL loader that creates new processes faster, and an improved thread pool. 7 can support multiple pools per process, something XP cant do.
XP lacks something Win7 has called “SMT parking” or “core parking.” This is a feature developed in partnership with Intel, which supports the Hyper-Threading (HT) in the Core i5/i7s. In addition to managing the threads in cores, Windows 7 also manages the HT in the Intel chips.
XP also has none of the multicore features added in Win Server 2008 R2 which Win7 implements.
And...
XP stopped being sold to OEM's on October 22, 2010.
Support for Windows XP with Service Pack 2 (SP2) ended on July 13, 2010.
Apart from memory limits of 3 to 4GB, XP does not support 2+TB HDD's, so the new 3TB Hard Drives wont work (or only 2TB will be recognised).
XP cant do 4K alignment with HDD's and SSD's, so performance on modern SSD's and HDD's suffers.
XP has limited and very dated native driver support for hardware. Win7 will automatically install drivers for a lot of modern hardware, including a basic graphics driver so your LCD monitor runs at native res.
XP cant do any Virtualization.
XP has no native Blu-Ray support.
XP has no decent HTPC/Media Center capabilities.
XP cant play many many video codec types by default, Win7 can play many video types without having to download the codecs in order to play them.
XP has no BitLocker (Hard Drive encryption).
XP has no Backup and Restore.
XP cant output as many colours as Win7. Future displays (and some current displays) with higher colour bit rates wont be supported.
XP lacks Parental Controls.
XP is vastly less secure.
XP's search feature is ridiculously slow and completely useless compared to Win7's.
XP does not support the new motherboard UEFI BIOS chips (although there not technically called a BIOS anymore).
XP lacks any real touchscreen support.
XP lacks a way to use your wireless-equipped laptop as a wireless access point for other PCs when you're connected to a wired network.
XP lacks anti-convoy features to keep performance from degrading when a large number of threads are blocked, waiting for resources. You probably have encountered these. The whole system would freeze for several seconds and not respond to any input, then suddenly the system takes off again, running all of its processes. That was a convoy locking up everything.
XP cant do DX10 or DX11, but also many GPU compute technologies used in newer software because of this.
XP has no GPU acceleration for the desktop, performance suffers because of this, and a simple thing like dragging a Window will use way more CPU percentage. You also get screen tearing and screen redraw problems (where you literally see XP drawing the window).
XP does not support nonuniform memory architecture (NUMA) systems (in AMD Opteron and Intel Nehalem families).
XP was built back in the time of Symmetric Multiprocessing (SMP), where multiple cores in a CPU were seen as separate physical CPUs, as were multithreaded CPUs like the Core i5/i7. Memory was seen as a single fabric. Win7 sees cores as functional nodes, manages threads between the nodes, and allows for partitioning or allocating memory between cores.
XP cannot render more than one application at once. In Win7 more than one application can be rendered by the GDI layer at the same time. Each core can do a concurrent GDI rendering, and the GDI stack can send multiple requests out to the GPU for rendering work.
XP has inferior power management, memory management, and core management.
This is just a very small amount of the limits of XP. Theres literary hundreds.
If you have Win7 you can always run the XP Mode virtualization feature, a free download from MS for Win7, this will ensure pretty much any XP software will work.
Anything XP can do Win7 can do, and a lot more.
