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GeForce GTX 295 vs Radeon HD 4870 X2

Intro

The GeForce GTX 295 features a clock frequency of 576 MHz and a GDDR3 memory frequency of 999 MHz. It also features a 448-bit bus, and makes use of a 55 nm design. It features 240 SPUs, 80 TAUs, and 28 ROPs.

Compare that to the Radeon HD 4870 X2, which makes use of a 55 nm design. AMD has set the core frequency at 750 MHz. The GDDR5 RAM runs at a frequency of 900 MHz on this specific card. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 295 289 Watts
Radeon HD 4870 X2 350 Watts
Difference: 61 Watts (21%)

Memory Bandwidth

Performance-wise, the Radeon HD 4870 X2 should in theory be a little bit better than the GeForce GTX 295 in general. (explain)

Radeon HD 4870 X2 230400 MB/sec
GeForce GTX 295 223776 MB/sec
Difference: 6624 (3%)

Texel Rate

The GeForce GTX 295 should be much (more or less 54%) better at texture filtering than the Radeon HD 4870 X2. (explain)

GeForce GTX 295 92160 Mtexels/sec
Radeon HD 4870 X2 60000 Mtexels/sec
Difference: 32160 (54%)

Pixel Rate

The GeForce GTX 295 will be a lot (approximately 34%) more effective at full screen anti-aliasing than the Radeon HD 4870 X2, and should be able to handle higher resolutions better. (explain)

GeForce GTX 295 32256 Mpixels/sec
Radeon HD 4870 X2 24000 Mpixels/sec
Difference: 8256 (34%)

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 X2

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 X2
Manufacturer nVidia AMD
Year January 8, 2009 Aug 12, 2008
Code Name G200b R700
Memory 896 MB (x2) 1024 MB (x2)
Core Speed 576 MHz (x2) 750 MHz (x2)
Memory Speed 1998 MHz (x2) 3600 MHz (x2)
Power (Max TDP) 289 watts 350 watts
Bandwidth 223776 MB/sec 230400 MB/sec
Texel Rate 92160 Mtexels/sec 60000 Mtexels/sec
Pixel Rate 32256 Mpixels/sec 24000 Mpixels/sec
Unified Shaders 240 (x2) 800(160x5) (x2)
Texture Mapping Units 80 (x2) 40 (x2)
Render Output Units 28 (x2) 16 (x2)
Bus Type GDDR3 GDDR5
Bus Width 448-bit (x2) 256-bit (x2)
Fab Process 55 nm 55 nm
Transistors 1400 million 956 million
Bus PCIe x16 2.0 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.1 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 can be processed per second. This number is worked out by multiplying the total amount of 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 processed in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially 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 295

Amazon.com

Check prices at:

Radeon HD 4870 X2

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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