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GeForce GTX 465 vs Radeon HD 4890 1GB

Intro

The GeForce GTX 465 features a GPU core clock speed of 607 MHz, and the 1024 MB of GDDR5 RAM is set to run at 802 MHz through a 256-bit bus. It also is comprised of 352 Stream Processors, 44 TAUs, and 32 ROPs.

Compare those specs to the Radeon HD 4890 1GB, which has core speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 1GB 190 Watts
GeForce GTX 465 200 Watts
Difference: 10 Watts (5%)

Memory Bandwidth

The Radeon HD 4890 1GB should theoretically be a lot faster than the GeForce GTX 465 overall. (explain)

Radeon HD 4890 1GB 124800 MB/sec
GeForce GTX 465 102592 MB/sec
Difference: 22208 (22%)

Texel Rate

The Radeon HD 4890 1GB should be a lot (approximately 50%) more effective at anisotropic filtering than the GeForce GTX 465. (explain)

Radeon HD 4890 1GB 40000 Mtexels/sec
GeForce GTX 465 26708 Mtexels/sec
Difference: 13292 (50%)

Pixel Rate

The GeForce GTX 465 will be a lot (approximately 21%) faster with regards to full screen anti-aliasing than the Radeon HD 4890 1GB, and also capable of handling higher resolutions while still performing well. (explain)

GeForce GTX 465 19424 Mpixels/sec
Radeon HD 4890 1GB 16000 Mpixels/sec
Difference: 3424 (21%)

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.

Price Comparison

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GeForce GTX 465

Amazon.com

Check prices at:

Radeon HD 4890 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

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Model GeForce GTX 465 Radeon HD 4890 1GB
Manufacturer nVidia AMD
Year May 2010 Apr 2, 2009
Code Name GF100 RV790 XT
Memory 1024 MB 1024 MB
Core Speed 607 MHz 1000 MHz
Memory Speed 3208 MHz 3900 MHz
Power (Max TDP) 200 watts 190 watts
Bandwidth 102592 MB/sec 124800 MB/sec
Texel Rate 26708 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 19424 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 352 800(160x5)
Texture Mapping Units 44 40
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 55 nm
Transistors 3000 million 959 million
Bus PCIe x16 PCIe 2.0 x16
DirectX Version DirectX 11 DirectX 10.1
OpenGL Version OpenGL 4.1 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of information (counted in megabytes per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the video 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 number of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour 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 quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce GTX 465

Amazon.com

Check prices at:

Radeon HD 4890 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.

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