Compare any two graphics cards:
VS

Radeon HD 4850 X2 1GB vs Radeon HD 4890 2GB

Intro

The Radeon HD 4850 X2 1GB features a 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 features 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

Compare those specifications to the Radeon HD 4890 2GB, which comes with a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 memory set to run at 975 MHz through a 256-bit bus. It also features 800(160x5) Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 2GB 190 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 60 Watts (32%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 1GB is 2% faster than the Radeon HD 4890 2GB overall, due to its greater bandwidth. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
Radeon HD 4890 2GB 124800 MB/sec
Difference: 2304 (2%)

Texel Rate

The Radeon HD 4850 X2 1GB should be a lot (about 25%) more effective at texture filtering than the Radeon HD 4890 2GB. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Radeon HD 4890 2GB 40000 Mtexels/sec
Difference: 10000 (25%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4850 X2 1GB is the winner, by a large margin. (explain)

Radeon HD 4850 X2 1GB 20000 Mpixels/sec
Radeon HD 4890 2GB 16000 Mpixels/sec
Difference: 4000 (25%)

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 1GB

Amazon.com

Check prices at:

Radeon HD 4890 2GB

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 1GB Radeon HD 4890 2GB
Manufacturer AMD AMD
Year Nov 7, 2008 Apr 2, 2009
Code Name R700 RV790 XT
Memory 1024 MB (x2) 2048 MB
Core Speed 625 MHz (x2) 1000 MHz
Memory Speed 1986 MHz (x2) 3900 MHz
Power (Max TDP) 250 watts 190 watts
Bandwidth 127104 MB/sec 124800 MB/sec
Texel Rate 50000 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 20000 Mpixels/sec 16000 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 959 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: Bandwidth is the largest amount of data (measured in MB per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 are processed in one second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4850 X2 1GB

Amazon.com

Check prices at:

Radeon HD 4890 2GB

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