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7770 на порядок лучше по тестам в реальных играх.

бери GTX 550

Ati 7770

Джифорсе лучше.

GTX 550 Ti
а лучше GTX 560

GeForce GTX 550 Ti vs Radeon HD 7770

Intro

The GeForce GTX 550 Ti makes use of a 40 nm design. nVidia has clocked the core frequency at 900 MHz. The GDDR5 memory works at a frequency of 1026 MHz on this model. It features 192 SPUs along with 32 Texture Address Units and 24 ROPs.
Compare those specs to the Radeon HD 7770, which has a clock speed of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It is comprised of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

(No game benchmarks for this combination yet.)
Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 777080 Watts
GeForce GTX 550 Ti116 Watts
Difference: 36 Watts (45%)
Memory Bandwidth

Performance-wise, the GeForce GTX 550 Ti should theoretically be quite a bit superior to the Radeon HD 7770 overall. (explain)

GeForce GTX 550 Ti98496 MB/sec
Radeon HD 777072000 MB/sec
Difference: 26496 (37%)
Texel Rate

The Radeon HD 7770 is a lot (more or less 39%) better at texture filtering than the GeForce GTX 550 Ti. (explain)
Radeon HD 777040000 Mtexels/sec
GeForce GTX 550 Ti28800 Mtexels/sec
Difference: 11200 (39%)
Pixel Rate

The GeForce GTX 550 Ti will be much (about 35%) better at AA than the Radeon HD 7770, and also should be capable of handling higher screen resolutions better. (explain)
GeForce GTX 550 Ti21600 Mpixels/sec
Radeon HD 777016000 Mpixels/sec
Difference: 5600 (35%)
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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.