Unless there has been a change to the spec, there is nothing new that would prompt Nvidia to say RSX is less powerful than the 7800 GTX. We've known the GTX has more memory bandwidth, but we also know RSX is clocked at 550Mhz and has a much higher bandwidth to the CPU than the G70. This is something NVidia has repeatedly pointed at as giving RSX a disproportionate edge. You can think of it as unrelated to memory bandwidth if you like, but then you have to draw comparison with G70's PCi Express connection, and see the difference there. NVidia (and devs) have been saying repeatedly that RSX is more powerful..(let's not start digging up quotes).
Also, and more directly related - there are people with PSM saying there's not a mention of this in the issue they are reading. A guy at EvilAvatar forums - a renowned "Xbot" - posted this, but no one else seems to be able to see what he's seeing. GameTab picked it up from there, then The Inquirer picked it up from there, and I've no doubt TXB picked it up from The Inquirer. Internet Journalism..