the 7000 didnt even have t&l, plus this is a little bit slower than that even.
the igp320m is a single channel ddr chipset .
the 7000 's all used either 128bit sdram or 64bit ddr. so basically the same as a single channel ddr chipset, however , there is probably some overhead from having to use system memory so i'd guess the igp320 is even slower than a radeon 7000 sdr / ddr (aka radeon VE rv100)