It's the 128mb version. The one that's been tested to oc well on core/mem is the 256mb version. Still a good deal, but maybe not an insane deal.
Edit.
unless it also overclocks like crazy
Edit.
unless it also overclocks like crazy
$129 :Q
That's either a typo or an insanely low price on a gto. I doubt it will OC much because it lacks an external power connector, and forget about unlocking pipes, but for that price the card simply has no competition.