GeForce GTS 250 1GB vs Radeon HD 4770

Intro

Compare those specs to the Radeon HD 4770, which has a clock speed of 750 MHz and a GDDR5 memory frequency of 800 MHz. It also features a 128-bit bus, and makes use of a 40 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
GeForce GTS 250 1GB		145 Watts
	Difference: 65 Watts (81%)

Memory Bandwidth

The GeForce GTS 250 1GB, in theory, should be quite a bit faster than the Radeon HD 4770 overall. (explain)

GeForce GTS 250 1GB		70400 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 19200 (38%)

Texel Rate

The GeForce GTS 250 1GB should be a lot (more or less 97%) better at AF than the Radeon HD 4770. (explain)

GeForce GTS 250 1GB		47232 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 23232 (97%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4770 is the winner, though only just barely. (explain)

Radeon HD 4770		12000 Mpixels/sec
GeForce GTS 250 1GB		11808 Mpixels/sec
	Difference: 192 (2%)

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 largest amount of information (measured in megabytes per second) that can be moved over 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. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.