between a 128MB Bulk and 256MB there should be no performance difference unless you are doing things that really, really hog memory. If you have to ask if you need it or not, then you don't.
re: JC and the Parhelia. Yes, he made a few comments. Yes, his points are all very valid and true. none of the features that make the Parhelia a unique card will provide any benefit in doom 3 - in fact they will take away from the game. Yes, the raw performance of the Parhelia seems to be rather disappointing - and as of 8 months after JC wrote that, the performance was still just plain sorry for what the card should be able to do.
re: quads and displacement mapping. the retraction of his comments about it being a quad based displacement mapping method have nothing to do with the rest of his statements. it is a small, technical detail. Ultimately, its not even a big deal since no one uses displacement mapping now and since Matrox apparently is not doing any DX9 level work on the Parhelia, despite the core being compatable.
re: JC and the Parhelia. Yes, he made a few comments. Yes, his points are all very valid and true. none of the features that make the Parhelia a unique card will provide any benefit in doom 3 - in fact they will take away from the game. Yes, the raw performance of the Parhelia seems to be rather disappointing - and as of 8 months after JC wrote that, the performance was still just plain sorry for what the card should be able to do.
re: quads and displacement mapping. the retraction of his comments about it being a quad based displacement mapping method have nothing to do with the rest of his statements. it is a small, technical detail. Ultimately, its not even a big deal since no one uses displacement mapping now and since Matrox apparently is not doing any DX9 level work on the Parhelia, despite the core being compatable.
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