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4830 doesn't have 40 texture units but 32. (shader units and texture units are coupled)
Furthermore, with every generation ATI chips everybody always claims that 16 rops is the bottleneck. Since R520 the performance has increased >6x while ATI still uses 16 rops. Why? Because a rop isn't something as simplistic as most people think. Their performance and efficiency goes up too. What's more important is that ATI's and nVidia's rops aren't comparable. So their amount isn't either comparable.
There's also difference in efficiency (and latency) in GDDR3 and GDDR5.
And performance doesn't scale linear because there are many interconnects and cache structures inside these chips (with limitations ofcourse). So basically all your calculations are void.
Furthermore, with every generation ATI chips everybody always claims that 16 rops is the bottleneck. Since R520 the performance has increased >6x while ATI still uses 16 rops. Why? Because a rop isn't something as simplistic as most people think. Their performance and efficiency goes up too. What's more important is that ATI's and nVidia's rops aren't comparable. So their amount isn't either comparable.
There's also difference in efficiency (and latency) in GDDR3 and GDDR5.
And performance doesn't scale linear because there are many interconnects and cache structures inside these chips (with limitations ofcourse). So basically all your calculations are void.