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GeForce GTS 250 1GB vs Radeon HD 7870

Intro

The GeForce GTS 250 1GB features a clock speed of 738 MHz and a GDDR3 memory speed of 1100 MHz. It also makes use of a 256-bit bus, and uses a 65/55 nm design. It is made up of 128 SPUs, 64 Texture Address Units, and 16 Raster Operation Units.

Compare all that to the Radeon HD 7870, which features core speeds of 1000 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 memory. It features 1280 SPUs as well as 80 TAUs and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 250 1GB 145 Watts
Radeon HD 7870 175 Watts
Difference: 30 Watts (21%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 will be 118% faster than the GeForce GTS 250 1GB in general, due to its greater data rate. (explain)

Radeon HD 7870 153600 MB/sec
GeForce GTS 250 1GB 70400 MB/sec
Difference: 83200 (118%)

Texel Rate

The Radeon HD 7870 will be a lot (approximately 69%) better at anisotropic filtering than the GeForce GTS 250 1GB. (explain)

Radeon HD 7870 80000 Mtexels/sec
GeForce GTS 250 1GB 47232 Mtexels/sec
Difference: 32768 (69%)

Pixel Rate

The Radeon HD 7870 should be a lot (about 171%) better at full screen anti-aliasing than the GeForce GTS 250 1GB, and also will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 7870 32000 Mpixels/sec
GeForce GTS 250 1GB 11808 Mpixels/sec
Difference: 20192 (171%)

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

GeForce GTS 250 1GB

Radeon HD 7870

Specifications

Display Specifications

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Model GeForce GTS 250 1GB Radeon HD 7870
Manufacturer nVidia AMD
Year March 3, 2009 March 2012
Code Name G92a/b Pitcairn XT
Memory 1024 MB 2048 MB
Core Speed 738 MHz 1000 MHz
Memory Speed 2200 MHz 4800 MHz
Power (Max TDP) 145 watts 175 watts
Bandwidth 70400 MB/sec 153600 MB/sec
Texel Rate 47232 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 11808 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 128 1280
Texture Mapping Units 64 80
Render Output Units 16 32
Bus Type GDDR3 GDDR5
Bus Width 256-bit 256-bit
Fab Process 65/55 nm 28 nm
Transistors 754 million 2800 million
Bus PCIe x16 2.0 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.1 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the 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 amount of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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

GeForce GTS 250 1GB

Radeon HD 7870

Comments

One Response to “GeForce GTS 250 1GB vs Radeon HD 7870”
Orhan says:

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