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Question about PC video cards VS Xbox 360 video card - Page 2

post #11 of 13
Quote:
Originally Posted by VulcanDragon View Post
Actually, that's a big limitation for the consoles. Less RAM is always bad, and consoles are always constrained in their RAM. Streaming off a disc is possible in PCs too, but it's not done because it sucks; physical I/O is the worst bottleneck in a system, and optical I/O is waaaaaaaayyyy worse than hard disk I/O. Console game designers often have to come up with complex swapping algorithms to keep the right assets in memory at the right time; which, while it demonstrates their l33t coding skillz admirably, they would likely trade in a minute for the ability to just "load the whole level" into RAM and forget about it.
Thats why the ps3 with it 256 megs of ram, has a hard time at 1080 resolutions.
if the 360 had a gig of ram, that would really solve a lot of hassle for them.
EDIT: the edRam is what wins the money too. HDR+4xAA with maybe 5% performance loss. Also i believe is CSAA, as the r600 is going to utilize CSAA.

Quote:
Originally Posted by reberto View Post
Um Xbox 360 GPU < 7800GTX. Not an ATI chip
Wrong the 360's GPU is an ATI Xenos, which is pre r600. It has 10Mb of edRam for seperate processing of AA and AF. Which is why the 360's GPU is so powerful.

sorry for the numerous double post but i was wrong about the 64 shaders. its actually 16 shaders organized on die per three SIMD untits. 3x16=48 and they do 4 ops per cycle. So thats 48x4 which is 192 shaders ops per cycle.
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post #12 of 13
Quote:
Originally Posted by reberto View Post
Um Xbox 360 GPU < 7800GTX. Not an ATI chip
From what I understand, and what has been stated, the 360 chip uses the unified shader architecture, and is indeed made by ATI. With 48 unified shaders it is most definitely better then the 7800 GTX.
post #13 of 13
Before the 360's release, a lot of rumors were popping up to compare the 360's graphics to pc. I think that is where you got mislead. But the 360 defiantly uses an ATI Xenos.
EDIT: instead of me just saying all of these things i can give you a very indepth article. If you have any questions understanding any of this, come back and ask. article here.
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