New VIA PT chipsets for the Pentium 4

Among other things VIA's new PT 880 Pro chipset support both PCI Express and AGP. A good feature if you're looking to upgrade but don't want to replace your fairly new AGP graphics card. There's also support for 1066 FSB speeds and DDR memory up to 400Mhz as well as DDR2 up to 667Mhz.

Read the review at Tom's Hardware Guide