I'm not sure at the moment... But with Sony being one vendor vs. the fragmented videocard vendors AND Sony throwing in 8 frigging gigs per console when the PC standard is 1-2, it is certain that Sony will get VERY good pricing for their GDDR compared to any other purchaser, much less generic 'spot prices'. Never mind Sony's recent purchase of a memory manufacturer, meaning they can get it at-cost once that fab can be switched to full GDDR production.
I'm not saying that there will be no price difference at all, but I don't see that it would be enough to counter the effects of Sony confidently having market dominance and better economies of scale. Not to mention that any subsidies are WAY more rationale for Sony than for MS, given Sony may make 2x+ the revenue from licencing fees for games: the tide is going in Sony's favor.
