Submit Benchmarks!

Submit SSD Benchmark
Submit GPU Benchmark

Compare any two graphics cards:
VS

Radeon HD 4850 X2 512MB vs Radeon HD 4870 1GB

Intro

The Radeon HD 4850 X2 512MB has a core clock frequency of 625 MHz and a GDDR3 memory frequency of 993 MHz. It also uses a 256-bit bus, and uses a 55 nm design. It is made up of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 4870 1GB, which features a core clock frequency of 750 MHz and a GDDR5 memory frequency of 900 MHz. It also makes use of a 256-bit bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 1GB 150 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 100 Watts (67%)

Memory Bandwidth

In theory, the Radeon HD 4850 X2 512MB should perform a small bit faster than the Radeon HD 4870 1GB in general. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
Radeon HD 4870 1GB 115200 MB/sec
Difference: 11904 (10%)

Texel Rate

The Radeon HD 4850 X2 512MB will be a lot (about 67%) better at AF than the Radeon HD 4870 1GB. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Radeon HD 4870 1GB 30000 Mtexels/sec
Difference: 20000 (67%)

Pixel Rate

The Radeon HD 4850 X2 512MB should be a lot (approximately 67%) better at full screen anti-aliasing than the Radeon HD 4870 1GB, and able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Radeon HD 4870 1GB 12000 Mpixels/sec
Difference: 8000 (67%)

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

Display Prices

Hide Prices

Radeon HD 4850 X2 512MB

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

Display Specifications

Hide Specifications

Model Radeon HD 4850 X2 512MB Radeon HD 4870 1GB
Manufacturer AMD AMD
Year Nov 7, 2008 Jun 25, 2008
Code Name R700 RV770 XT
Memory 512 MB (x2) 1024 MB
Core Speed 625 MHz (x2) 750 MHz
Memory Speed 1986 MHz (x2) 3600 MHz
Power (Max TDP) 250 watts 150 watts
Bandwidth 127104 MB/sec 115200 MB/sec
Texel Rate 50000 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 20000 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 800(160x5) (x2) 800(160x5)
Texture Mapping Units 40 (x2) 40
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 55 nm
Transistors 956 million 956 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better 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 video card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core 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 fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4850 X2 512MB

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.

Comments

Be the first to leave a comment!

Your email address will not be published. Required fields are marked *


*

WordPress Anti-Spam by WP-SpamShield