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GeForce GTS 250 512MB vs Radeon HD 5770

Intro

The GeForce GTS 250 512MB uses a 65/55 nm design. nVidia has clocked the core speed at 738 MHz. The GDDR3 RAM is set to run at a speed of 1100 MHz on this particular card. It features 128 SPUs along with 64 Texture Address Units and 16 ROPs.

Compare those specs to the Radeon HD 5770, which has GPU core speed of 850 MHz, and 1024 MB of GDDR5 memory set to run at 1200 MHz through a 128-bit bus. It also features 800(160x5) Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

Crysis

Settings: High Detail
AA: 4x
AF: none
Resolution: 1680x1050
Test Machine: Intel Core i5-750,Windows 7 Ultimate x64,3 x 2GB (Source)
Radeon HD 5770 34 FPS
GeForce GTS 250 512MB 27 FPS
Difference: 7 FPS (26%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770 108 Watts
GeForce GTS 250 512MB 145 Watts
Difference: 37 Watts (34%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5770 should perform a little bit faster than the GeForce GTS 250 512MB overall. (explain)

Radeon HD 5770 76800 MB/sec
GeForce GTS 250 512MB 70400 MB/sec
Difference: 6400 (9%)

Texel Rate

The GeForce GTS 250 512MB is quite a bit (approximately 39%) faster with regards to anisotropic filtering than the Radeon HD 5770. (explain)

GeForce GTS 250 512MB 47232 Mtexels/sec
Radeon HD 5770 34000 Mtexels/sec
Difference: 13232 (39%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 5770 is a better choice, though not by far. (explain)

Radeon HD 5770 13600 Mpixels/sec
GeForce GTS 250 512MB 11808 Mpixels/sec
Difference: 1792 (15%)

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

GeForce GTS 250 512MB

Amazon.com

Radeon HD 5770

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

Model GeForce GTS 250 512MB Radeon HD 5770
Manufacturer nVidia AMD
Year March 3, 2009 October 13, 2009
Code Name G92a/b Juniper XT
Fab Process 65/55 nm 40 nm
Bus PCIe x16 2.0 PCIe 2.1 x16
Memory 512 MB 1024 MB
Core Speed 738 MHz 850 MHz
Shader Speed 1836 MHz (N/A) MHz
Memory Speed 1100 MHz (2200 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 128 800(160x5)
Texture Mapping Units 64 40
Render Output Units 16 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit 128-bit
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.1 OpenGL 3.2
Power (Max TDP) 145 watts 108 watts
Shader Model 4.0 5.0
Bandwidth 70400 MB/sec 76800 MB/sec
Texel Rate 47232 Mtexels/sec 34000 Mtexels/sec
Pixel Rate 11808 Mpixels/sec 13600 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in MB per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total amount of texture units 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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