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GeForce GTS 250 1GB vs Radeon HD 7770

Intro

The GeForce GTS 250 1GB features a GPU core clock speed of 738 MHz, and the 1024 MB of GDDR3 memory is set to run at 1100 MHz through a 256-bit bus. It also is made up of 128 Stream Processors, 64 TAUs, and 16 Raster Operation Units.

Compare all that to the Radeon HD 7770, which features clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 memory. It features 640 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
GeForce GTS 250 1GB 145 Watts
Difference: 65 Watts (81%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7770 should theoretically be a bit superior to the GeForce GTS 250 1GB in general. (explain)

Radeon HD 7770 72000 MB/sec
GeForce GTS 250 1GB 70400 MB/sec
Difference: 1600 (2%)

Texel Rate

The GeForce GTS 250 1GB should be just a bit (about 18%) faster with regards to AF than the Radeon HD 7770. (explain)

GeForce GTS 250 1GB 47232 Mtexels/sec
Radeon HD 7770 40000 Mtexels/sec
Difference: 7232 (18%)

Pixel Rate

The Radeon HD 7770 is much (approximately 36%) more effective at anti-aliasing than the GeForce GTS 250 1GB, and will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 7770 16000 Mpixels/sec
GeForce GTS 250 1GB 11808 Mpixels/sec
Difference: 4192 (36%)

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

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GeForce GTS 250 1GB

Amazon.com

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Radeon HD 7770

Amazon.com

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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

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Model GeForce GTS 250 1GB Radeon HD 7770
Manufacturer nVidia AMD
Year March 3, 2009 February 2012
Code Name G92a/b Cape Verde XT
Memory 1024 MB 1024 MB
Core Speed 738 MHz 1000 MHz
Memory Speed 2200 MHz 4500 MHz
Power (Max TDP) 145 watts 80 watts
Bandwidth 70400 MB/sec 72000 MB/sec
Texel Rate 47232 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 11808 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 128 640
Texture Mapping Units 64 40
Render Output Units 16 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit 128-bit
Fab Process 65/55 nm 28 nm
Transistors 754 million 1500 million
Bus PCIe x16 2.0 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.1 OpenGL 4.2

Memory Bandwidth: Bandwidth is the largest amount of data (counted in MB per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, 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 number of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce GTS 250 1GB

Amazon.com

Check prices at:

Radeon HD 7770

Amazon.com

Check prices at:

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.

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