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GeForce GTX 295 vs Radeon HD 3870 X2 1GB

Intro

The GeForce GTX 295 comes with clock speeds of 576 MHz on the GPU, and 999 MHz on the 896 MB of GDDR3 memory. It features 240 SPUs along with 80 Texture Address Units and 28 Rasterization Operator Units.

Compare all that to the Radeon HD 3870 X2 1GB, which comes with a GPU core clock speed of 825 MHz, and 1024 MB of GDDR4 memory set to run at 1126 MHz through a 256-bit bus. It also features 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the GeForce GTX 295 should theoretically be a lot better than the Radeon HD 3870 X2 1GB in general. (explain)

GeForce GTX 295 223776 MB/sec
Radeon HD 3870 X2 1GB 144128 MB/sec
Difference: 79648 (55%)

Texel Rate

The GeForce GTX 295 is much (about 249%) better at anisotropic filtering than the Radeon HD 3870 X2 1GB. (explain)

GeForce GTX 295 92160 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 65760 (249%)

Pixel Rate

The GeForce GTX 295 should be a lot (more or less 22%) more effective at anti-aliasing than the Radeon HD 3870 X2 1GB, and also will be able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 295 32256 Mpixels/sec
Radeon HD 3870 X2 1GB 26400 Mpixels/sec
Difference: 5856 (22%)

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 3870 X2 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 295 Radeon HD 3870 X2 1GB
Manufacturer nVidia AMD
Year January 8, 2009 Jan 28, 2008
Code Name G200b R680
Memory 896 MB (x2) 1024 MB (x2)
Core Speed 576 MHz (x2) 825 MHz (x2)
Memory Speed 1998 MHz (x2) 2252 MHz (x2)
Power (Max TDP) 289 watts (Unknown) watts
Bandwidth 223776 MB/sec 144128 MB/sec
Texel Rate 92160 Mtexels/sec 26400 Mtexels/sec
Pixel Rate 32256 Mpixels/sec 26400 Mpixels/sec
Unified Shaders 240 (x2) 320(64x5) (x2)
Texture Mapping Units 80 (x2) 16 (x2)
Render Output Units 28 (x2) 16 (x2)
Bus Type GDDR3 GDDR4
Bus Width 448-bit (x2) 256-bit (x2)
Fab Process 55 nm 55 nm
Transistors 1400 million (Unknown) million
Bus PCIe x16 2.0 PCIe 2.0 x16/(internal PCIe 1.1 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 (counted in megabytes per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also 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 potential to get to the max fill rate.

Display Prices

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GeForce GTX 295

Amazon.com

Check prices at:

Radeon HD 3870 X2 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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