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Radeon HD 4870 X2 vs Radeon HD 7770

Intro

The Radeon HD 4870 X2 has a clock speed of 750 MHz and a GDDR5 memory frequency of 900 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Compare those specifications to the Radeon HD 7770, which comes with a clock frequency of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also features a 128-bit memory bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
Radeon HD 4870 X2 350 Watts
Difference: 270 Watts (338%)

Memory Bandwidth

The Radeon HD 4870 X2 should in theory be quite a bit faster than the Radeon HD 7770 overall. (explain)

Radeon HD 4870 X2 230400 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 158400 (220%)

Texel Rate

The Radeon HD 4870 X2 will be quite a bit (more or less 50%) faster with regards to anisotropic filtering than the Radeon HD 7770. (explain)

Radeon HD 4870 X2 60000 Mtexels/sec
Radeon HD 7770 40000 Mtexels/sec
Difference: 20000 (50%)

Pixel Rate

The Radeon HD 4870 X2 should be a lot (approximately 50%) more effective at FSAA than the Radeon HD 7770, and also able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
Radeon HD 7770 16000 Mpixels/sec
Difference: 8000 (50%)

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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Radeon HD 4870 X2

Amazon.com

Check prices at:

Radeon HD 7770

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 Radeon HD 4870 X2 Radeon HD 7770
Manufacturer AMD AMD
Year Aug 12, 2008 February 2012
Code Name R700 Cape Verde XT
Memory 1024 MB (x2) 1024 MB
Core Speed 750 MHz (x2) 1000 MHz
Memory Speed 3600 MHz (x2) 4500 MHz
Power (Max TDP) 350 watts 80 watts
Bandwidth 230400 MB/sec 72000 MB/sec
Texel Rate 60000 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 24000 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 800(160x5) (x2) 640
Texture Mapping Units 40 (x2) 40
Render Output Units 16 (x2) 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 55 nm 28 nm
Transistors 956 million 1500 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the 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 texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher 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 maximum amount of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 4870 X2

Amazon.com

Check prices at:

Radeon HD 7770

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.

Comments

2 Responses to “Radeon HD 4870 X2 vs Radeon HD 7770”
Quad Damage says:

350W! Oh my sh**!

Shumacher says:

what do you expect, a queef?

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