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GeForce 9500 GT DDR2 vs Radeon HD 7770

Intro

The GeForce 9500 GT DDR2 features a GPU core clock speed of 550 MHz, and the 256 MB of DDR2 RAM runs at 500 MHz through a 128-bit bus. It also is comprised of 32 Stream Processors, 16 TAUs, and 8 Raster Operation Units.

Compare those specs to the Radeon HD 7770, which has GPU core speed of 1000 MHz, and 1024 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is comprised of 640 Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9500 GT DDR2 50 Watts
Radeon HD 7770 80 Watts
Difference: 30 Watts (60%)

Memory Bandwidth

Theoretically, the Radeon HD 7770 should perform much faster than the GeForce 9500 GT DDR2 overall. (explain)

Radeon HD 7770 72000 MB/sec
GeForce 9500 GT DDR2 16000 MB/sec
Difference: 56000 (350%)

Texel Rate

The Radeon HD 7770 is a lot (about 355%) more effective at anisotropic filtering than the GeForce 9500 GT DDR2. (explain)

Radeon HD 7770 40000 Mtexels/sec
GeForce 9500 GT DDR2 8800 Mtexels/sec
Difference: 31200 (355%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7770 is the winner, by far. (explain)

Radeon HD 7770 16000 Mpixels/sec
GeForce 9500 GT DDR2 4400 Mpixels/sec
Difference: 11600 (264%)

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 9500 GT DDR2

Amazon.com

Radeon HD 7770

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 9500 GT DDR2 Radeon HD 7770
Manufacturer nVidia AMD
Year July 2008 February 2012
Code Name G96a Cape Verde XT
Fab Process 65 nm 28 nm
Bus PCIe x16 2.0, PCI PCIe 3.0 x16
Memory 256 MB 1024 MB
Core Speed 550 MHz 1000 MHz
Shader Speed 1400 MHz (N/A) MHz
Memory Speed 500 MHz (1000 MHz effective) 1125 MHz (4500 MHz effective)
Unified Shaders 32 640
Texture Mapping Units 16 40
Render Output Units 8 16
Bus Type DDR2 GDDR5
Bus Width 128-bit 128-bit
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2
Power (Max TDP) 50 watts 80 watts
Shader Model 4.0 5.0
Bandwidth 16000 MB/sec 72000 MB/sec
Texel Rate 8800 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 4400 Mpixels/sec 16000 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units of the card 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 in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

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