PS3 СРАВНЕНИЕ АРХИТЕКТУР ПС3 и Х360

gera · 12 авг 2008

http://forum.beyond3d.com/showthread.php?t=45041&page=38

I think it's generally known that is very inefficient. GDDR3 memory in the PS3 doesn't lend itself to sharing nearly as well as XDR memory. I don't know if it still holds, but as I understand it the best you can do is let the RSX read vertex and some additional texture data (both can be preprocessed by for instance one or more SPEs) from XDR memory, and the RSX can also put its framebuffer in XDR which can be post-processed by SPEs again. So you want to avoid the GDDR3 memory being accessed from both the Cell and the RSX at the same time, and keep RSX 'boss' over the GDDR3 memory.

This setup, which leads to some very efficient bandwidth, is actually quite good. I think by far the biggest disadvantage versus the 360's setup is that the latter's memory is just easier to work with, just as the 3 homogenous PPU cores are easier to work with rather than the PPU vs SPU setup in the PS3. But if you want to get the very best performance and you're going to design for the PS3 from the ground up, I still suspect the PS3's setup even in terms of memory is the more powerful one, because in these days, you're going to get the best results if you optimise for streaming and bandwidth.

This is a process I can witness first hand with our team here. We started on the 360 and only started to work on the PS3 relatively late in the project. Initially the platform would get a lot of hate from the 360 guys. Things that are just plug-and-play on the 360 would require a week of programmer-time on the PS3. Hell, getting the graphics system to a point where we could actually render the game took months instead of weeks (ok, one programmer vs. three, but still). The further we get along, the more the perception changes. Yes, there are GPU features on Xenos that are missing on RSX. Some of them may be show-stoppers for other people, but we can usually find a better implementation that either does not need them or does funky things with SPUs to reduce the load on RSX. It usually takes more programmer time, but it's usually just plain faster at the end.
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Legion90 · 13 авг 2008

gera, что ещё раз подтверждает, что портирование - есть зло.

sosnovka · 26 авг 2008

Playstation 3's XDR RAM explained

http://www.rambus.com/assets/flash/products/sce_rambus_interview/index.html

Stratege · 28 авг 2008

Итагаки готов поспорить на выпивку, что разработка на PS3 проще, чем разработка на Денди…
Я бы с ним спорить не стал…

gera · 18 дек 2008

Техническая сторона Ratchet & Clank
http://www.insomniacgames.com/tech/articles/1108/files/Ratchet_and_Clank_WWS_Debrief_Feb_08.pdf

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PS3 СРАВНЕНИЕ АРХИТЕКТУР ПС3 и Х360

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PS3 СРАВНЕНИЕ АРХИТЕКТУР ПС3 и Х360

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