First, is the GT5220 the same as the ATXPNT ESX 500S?

Linux

Compatible Processors Pentium 4, Celeron D, Pentium Extreme Edition, Pentium D 64-bit Processors Compatibility Yes Processor Socket LGA775 Socket
Compatible Processors Pentium 4, Celeron D, Pentium Extreme Edition, Pentium D 64-bit Processors Compatibility Yes Processor Socket LGA775 Socket
Compatible Processors Pentium 4, Celeron D, Pentium Extreme Edition, Pentium D 64-bit Processors Compatibility Yes Processor Socket LGA775 Socket
Compatible Processors Pentium 4, Celeron D, Pentium Extreme Edition, Pentium D 64-bit Processors Compatibility Yes Processor Socket LGA775 Socket

You cannot use a SATA (serial ATA HDD in this machine. You need a PATA (parallel ATA) HDD, also known as IDE, ULTRA IDE, ULTRA ATA. This has a 40-pin ribbon connector & a 4-pin power connector.
Sizes generally available would be 80GB up to 250GB, although very few PATA drives are now sold since SATA is the new standard.

HI
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Depends on the socket type.. Socket 423 and 478 do not support core duo or quad core processor types. However, if you have LGA 775 (aka socket T) your motherboard will support the following:
Intel Pentium 4 (2.60 - 3.80 GHz)
Intel Celeron D (2.53 - 3.60 GHz )
Intel Pentium 4 Extreme Edition (3.20 - 3.73 GHz)
Intel Pentium D (2.66 - 3.60 GHz)
Pentium Extreme Edition (3.20 - 3.73 GHz)
Pentium Dual-Core (1.40 - 3.33 GHz)
Intel Core 2 Duo (1.60 - 3.33 GHz)
Intel Core 2 Extreme (2.66 - 3.20 GHz)
Intel Core 2 Quad (2.33 - 3.00 GHz)
Intel Xeon (1.86-3.40 GHz)
Intel Celeron (1.60 - 2.40 GHz)

No, Pentium is a line of processors that has started in 1993 and has had no less than 83 versions up to date. On your motherboard goes a Pentium 4 socket 478 core Northwood processor.

need to check see if can accept that much, might need bios update to handle it, if possible

Any pci or usb wireless card. Just visit you local electronics store and ask the sales guy to pick one that matches your router.

Company Site http://www.attechcomputers.co.cc

Windows Xp?

This motherboard supports the latest Pentium 4 CPU from Intel in LGA775 package. With 800MHz FSB, 1 MB L2 cache, Hyper-Threading Technology and core-speeds up to 3.6GHz and beyond, Intel's LGA775 Pentium 4 is one of the fastest desktop processors to date.
make sure your cpu has a 800mhz fsb