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 comes with clock speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 RAM. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Compare those specifications to the Radeon HD 4870 1GB, which has 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 TAUs, and 16 ROPs.

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

The Radeon HD 4850 X2 512MB should theoretically be a little bit faster than the Radeon HD 4870 1GB overall. (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 should be much (more or less 67%) faster with regards to texture filtering 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 is quite a bit (approximately 67%) more effective at anti-aliasing than the Radeon HD 4870 1GB, and will be able to handle higher resolutions while still performing well. (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 transferred past the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total texture units by the core 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 one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach 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