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GeForce GTS 250 512MB vs Radeon HD 5770

Intro

The GeForce GTS 250 512MB has clock speeds of 738 MHz on the GPU, and 1100 MHz on the 512 MB of GDDR3 RAM. It features 128 SPUs along with 64 Texture Address Units and 16 ROPs.

Compare all that to the Radeon HD 5770, which comes with GPU core speed of 850 MHz, and 1024 MB of GDDR5 RAM running at 1200 MHz through a 128-bit bus. It also is made up of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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 be 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 will be much (more or less 39%) better at AF 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 using high levels of AA is important to you, then the Radeon HD 5770 is a better choice, but 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 maximum amount of data (counted in megabytes per second) that can be moved over the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

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