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GeForce GTX 295 vs Radeon HD 4870 2GB

Intro

The GeForce GTX 295 features a GPU clock speed of 576 MHz, and the 896 MB of GDDR3 memory runs at 999 MHz through a 448-bit bus. It also features 240 SPUs, 80 TAUs, and 28 Raster Operation Units.

Compare those specs to the Radeon HD 4870 2GB, which comes with a GPU core clock speed of 750 MHz, and 2048 MB of GDDR5 memory set to run at 900 MHz through a 256-bit bus. It also is made up 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 4870 2GB 150 Watts
GeForce GTX 295 289 Watts
Difference: 139 Watts (93%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 295 should in theory be much superior to the Radeon HD 4870 2GB overall. (explain)

GeForce GTX 295 223776 MB/sec
Radeon HD 4870 2GB 115200 MB/sec
Difference: 108576 (94%)

Texel Rate

The GeForce GTX 295 should be a lot (approximately 207%) better at AF than the Radeon HD 4870 2GB. (explain)

GeForce GTX 295 92160 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 62160 (207%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 295 is superior to the Radeon HD 4870 2GB, by far. (explain)

GeForce GTX 295 32256 Mpixels/sec
Radeon HD 4870 2GB 12000 Mpixels/sec
Difference: 20256 (169%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce GTX 295

Amazon.com

Check prices at:

Radeon HD 4870 2GB

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 295 Radeon HD 4870 2GB
Manufacturer nVidia AMD
Year January 8, 2009 Jun 25, 2008
Code Name G200b RV770 XT
Memory 896 MB (x2) 2048 MB
Core Speed 576 MHz (x2) 750 MHz
Memory Speed 1998 MHz (x2) 3600 MHz
Power (Max TDP) 289 watts 150 watts
Bandwidth 223776 MB/sec 115200 MB/sec
Texel Rate 92160 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 32256 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 240 (x2) 800(160x5)
Texture Mapping Units 80 (x2) 40
Render Output Units 28 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 448-bit (x2) 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: Bandwidth is the maximum amount of information (in units of MB per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, 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 applied in one second. This is calculated by multiplying the total texture units by the core clock 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 in a second.

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

Display Prices

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GeForce GTX 295

Amazon.com

Check prices at:

Radeon HD 4870 2GB

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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