GeForce GTS 450 vs Radeon HD 5770

Intro

Compare those specs to the Radeon HD 5770, which comes with a core clock frequency of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 450		106 Watts
Radeon HD 5770		108 Watts
	Difference: 2 Watts (2%)

Memory Bandwidth

In theory, the Radeon HD 5770 will be 33% quicker than the GeForce GTS 450 overall, because of its higher data rate. (explain)

Radeon HD 5770		76800 MB/sec
GeForce GTS 450		57728 MB/sec
	Difference: 19072 (33%)

Texel Rate

The Radeon HD 5770 should be quite a bit (about 36%) more effective at AF than the GeForce GTS 450. (explain)

Radeon HD 5770		34000 Mtexels/sec
GeForce GTS 450		25056 Mtexels/sec
	Difference: 8944 (36%)

Pixel Rate

The Radeon HD 5770 should be a little bit (approximately 9%) better at full screen anti-aliasing than the GeForce GTS 450, and should be able to handle higher resolutions better. (explain)

Radeon HD 5770		13600 Mpixels/sec
GeForce GTS 450		12528 Mpixels/sec
	Difference: 1072 (9%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in MB per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.