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Raw-power and Fill Rate Tests, Continued

ATI Radeon HD 4850: Smarter by Design?
By , Florian Charpentier

Let’s continue the Pixel Shader 2.0 tests:

Radeon-HD4850 Geforce-9800-GTX+ GTX-260 GTX-280 Grafikkarten

The AMD architecture wins out – the 800 processing units are in evidence and despite their higher frequency, the GT200’s 240 units couldn’t keep up. Now let’s see the results with a newer version, using modern shaders.

Radeon-HD4850 Geforce-9800-GTX+ GTX-260 GTX-280 Grafikkarten

Again it’s not even close: the RV770’s 800 ALUs left the GeForce in the dust. On the other hand, as soon as the test puts the accent more on texture instructions...

Radeon-HD4850 Geforce-9800-GTX+ GTX-260 GTX-280 Grafikkarten

...the RV770 and its 40 texture units can’t compete with the G92’s 64 and the GT200’s 80. There’s no surprise as far as raw fill rate goes – the number of ROPs haven’t changed, still being limited to 16:

Radeon-HD4850 Geforce-9800-GTX+ GTX-260 GTX-280 Grafikkarten

All the GPUs logged scores that were very close to their theoretical values (10800 Mpixels/s for the 9800 GTX, 19264 for the 280 GTX and 24800 for the 3870x2). But we should mention the surprising results our 4850 attained, which even surpassed (if slightly) its theoretical value (10000 Mpixels/s). That was probably the result of the slight overclocking on the Asus model we tested (we’ll come back to that later).

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