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GeForce GTX 275 vs Radeon HD 4870 1GB

Intro

The GeForce GTX 275 has a GPU clock speed of 633 MHz, and the 896 MB of GDDR3 RAM is set to run at 1134 MHz through a 448-bit bus. It also is made up of 240 Stream Processors, 80 TAUs, and 28 ROPs.

Compare those specs to the Radeon HD 4870 1GB, which has a GPU core clock speed of 750 MHz, and 1024 MB of GDDR5 RAM set to run at 900 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 1GB 150 Watts
GeForce GTX 275 219 Watts
Difference: 69 Watts (46%)

Memory Bandwidth

Theoretically, the GeForce GTX 275 should be just a bit faster than the Radeon HD 4870 1GB overall. (explain)

GeForce GTX 275 127008 MB/sec
Radeon HD 4870 1GB 115200 MB/sec
Difference: 11808 (10%)

Texel Rate

The GeForce GTX 275 should be a lot (approximately 69%) more effective at AF than the Radeon HD 4870 1GB. (explain)

GeForce GTX 275 50640 Mtexels/sec
Radeon HD 4870 1GB 30000 Mtexels/sec
Difference: 20640 (69%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 275 is the winner, by a large margin. (explain)

GeForce GTX 275 17724 Mpixels/sec
Radeon HD 4870 1GB 12000 Mpixels/sec
Difference: 5724 (48%)

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 4870 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 4870 1GB
Manufacturer nVidia AMD
Year April 9, 2009 Jun 25, 2008
Code Name G200b RV770 XT
Memory 896 MB 1024 MB
Core Speed 633 MHz 750 MHz
Memory Speed 2268 MHz 3600 MHz
Power (Max TDP) 219 watts 150 watts
Bandwidth 127008 MB/sec 115200 MB/sec
Texel Rate 50640 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 17724 Mpixels/sec 12000 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 956 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 largest amount of information (in units of MB per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce GTX 275

Amazon.com

Check prices at:

Radeon HD 4870 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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