It's not good for a gateway unless you're planning on using that slot for ethernet. PCI is at least fast enough to drive some wi-fi.
There is this:
http://www.ebay.com/itm/200687415150?hlp=false
It costs almost twice as much but it has PCI plus two PCI-E mini slots. So you could run dual lan, have wireless and use a PCI-E SSD for boot.
Also don't torture these machines with a RAID card. 1.1Ghz dual-core isn't a lot of power. In some cases the Atom is even faster.
i agree the new amd chips need a high clock speed to be useful for much of anything i have used a laptop with a 1Ghz dual core apu and it was too slow.
hp make some interesting boards if you can live with a restricted bios and the need to use a power supply adapter.
search ebay for:
Asus MOCA-AR
socket 479 2 x ddr2 sodimm
pcie 16x
its compatible with socket 479 core duo and core 2 duo and will run with up to 3gb of ram.
not compatible with pci-e 2.0 ati graphics cards.
you will need to custom build a heatsink. i used a zalman north bridge cooler modified my bending the clips to fit.
Foxconn Irvine-GL6E
socket 775 2x ddr2
pcie 16x + pcie 1x
nvidia chipset.
Asus M2NC51-AR
socket am2 2x ddr2
pcie 16x + pci
or a normal foxconn board
Foxconn G31S
socket 775 1x ddr2
pcie16x pcie1x
2gb ram and 65w cpu max