The _optimal_ SM3 specs are 256MB, but the minimum is 128. I found the information saying that these turbocache thingys can do 'up to 256', but the problem is 1) I don't like getting my technical specs off of wikipedia, i'd rather verify it based on my actual hardware and 2) I had problems running TOMI on high graphics settings and the optimal specs are 128mb - so 'up to' apparently doesn't apply normaly to my setup.
Either way, i'll still buy it. I've been a dedicated Sam & Max fan since the first game came out and I'm not going to let something like skipping graphics stop me... I eked out the first season on my old clunker of a laptop and I'm willing to begrudgingly repeat the experience.