GeForce GTS 450 vs Radeon HD 5770

Intro

Compare that to the Radeon HD 5770, which makes use of a 40 nm design. AMD has set the core speed at 850 MHz. The GDDR5 RAM is set to run at a speed of 1200 MHz on this particular model. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator 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

The Radeon HD 5770 should in theory be quite a bit faster than the GeForce GTS 450 in general. (explain)

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

Texel Rate

The Radeon HD 5770 should be much (about 36%) more effective at texture filtering 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 will be a little bit (more or less 9%) faster with regards to FSAA than the GeForce GTS 450, and should be capable of handling higher resolutions without losing too much performance. (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 maximum amount of data (in units of MB per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 texture map elements (texels) that are applied per second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

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