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GeForce GTX 275 vs Radeon HD 4890 1GB

Intro

The GeForce GTX 275 features a GPU core speed of 633 MHz, and the 896 MB of GDDR3 RAM runs at 1134 MHz through a 448-bit bus. It also is made up of 240 SPUs, 80 TAUs, and 28 ROPs.

Compare those specifications to the Radeon HD 4890 1GB, which comes with a clock speed of 1000 MHz and a GDDR5 memory frequency of 975 MHz. It also uses a 256-bit memory bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 1GB 190 Watts
GeForce GTX 275 219 Watts
Difference: 29 Watts (15%)

Memory Bandwidth

The GeForce GTX 275, in theory, should be just a bit faster than the Radeon HD 4890 1GB overall. (explain)

GeForce GTX 275 127008 MB/sec
Radeon HD 4890 1GB 124800 MB/sec
Difference: 2208 (2%)

Texel Rate

The GeForce GTX 275 will be quite a bit (approximately 27%) more effective at texture filtering than the Radeon HD 4890 1GB. (explain)

GeForce GTX 275 50640 Mtexels/sec
Radeon HD 4890 1GB 40000 Mtexels/sec
Difference: 10640 (27%)

Pixel Rate

The GeForce GTX 275 is a bit (approximately 11%) faster with regards to full screen anti-aliasing than the Radeon HD 4890 1GB, and will be able to handle higher resolutions more effectively. (explain)

GeForce GTX 275 17724 Mpixels/sec
Radeon HD 4890 1GB 16000 Mpixels/sec
Difference: 1724 (11%)

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 GTX 275

Amazon.com

Check prices at:

Radeon HD 4890 1GB

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.

Specifications

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Model GeForce GTX 275 Radeon HD 4890 1GB
Manufacturer nVidia AMD
Year April 9, 2009 Apr 2, 2009
Code Name G200b RV790 XT
Memory 896 MB 1024 MB
Core Speed 633 MHz 1000 MHz
Memory Speed 2268 MHz 3900 MHz
Power (Max TDP) 219 watts 190 watts
Bandwidth 127008 MB/sec 124800 MB/sec
Texel Rate 50640 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 17724 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 240 800(160x5)
Texture Mapping Units 80 40
Render Output Units 28 16
Bus Type GDDR3 GDDR5
Bus Width 448-bit 256-bit
Fab Process 55 nm 55 nm
Transistors 1400 million 959 million
Bus PCIe x16 2.0 PCIe 2.0 x16
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.1 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better 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 amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs 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 lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce GTX 275

Amazon.com

Check prices at:

Radeon HD 4890 1GB

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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