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GeForce GTX 275 vs Radeon HD 4890 1GB

Intro

The GeForce GTX 275 comes with core clock speeds of 633 MHz on the GPU, and 1134 MHz on the 896 MB of GDDR3 memory. It features 240 SPUs along with 80 TAUs and 28 Rasterization Operator Units.

Compare those specs to the Radeon HD 4890 1GB, which features GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM set to run at 975 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

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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

Theoretically speaking, the GeForce GTX 275 will be 2% quicker than the Radeon HD 4890 1GB overall, due to its higher data rate. (explain)

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

Texel Rate

The GeForce GTX 275 is quite a bit (approximately 27%) more effective at AF 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 will be a little bit (about 11%) faster with regards to anti-aliasing than the Radeon HD 4890 1GB, and should be capable of handling 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: Bandwidth is the largest amount of information (in units of megabytes per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory speed. If the card has DDR memory, it must 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 high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - 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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