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Radeon HD 3850 512MB vs Radeon R9 390X 8G

Intro

The Radeon HD 3850 512MB comes with a core clock speed of 668 MHz and a GDDR3 memory frequency of 828 MHz. It also uses a 256-bit bus, and uses a 55 nm design. It is comprised of 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.

Compare all that to the Radeon R9 390X 8G, which comes with a GPU core clock speed of 1050 MHz, and 8192 MB of GDDR5 memory set to run at 1500 MHz through a 512-bit bus. It also is comprised of 2816 SPUs, 176 Texture Address Units, and 64 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 512MB 75 Watts
Radeon R9 390X 8G 275 Watts
Difference: 200 Watts (267%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 390X 8G is 625% quicker than the Radeon HD 3850 512MB in general, due to its higher data rate. (explain)

Radeon R9 390X 8G 384000 MB/sec
Radeon HD 3850 512MB 52992 MB/sec
Difference: 331008 (625%)

Texel Rate

The Radeon R9 390X 8G should be much (about 1629%) better at texture filtering than the Radeon HD 3850 512MB. (explain)

Radeon R9 390X 8G 184800 Mtexels/sec
Radeon HD 3850 512MB 10688 Mtexels/sec
Difference: 174112 (1629%)

Pixel Rate

The Radeon R9 390X 8G is a lot (more or less 529%) more effective at full screen anti-aliasing than the Radeon HD 3850 512MB, and also should be able to handle higher resolutions better. (explain)

Radeon R9 390X 8G 67200 Mpixels/sec
Radeon HD 3850 512MB 10688 Mpixels/sec
Difference: 56512 (529%)

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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Radeon HD 3850 512MB

Amazon.com

Check prices at:

Radeon R9 390X 8G

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 Radeon HD 3850 512MB Radeon R9 390X 8G
Manufacturer AMD AMD
Year Nov 19, 2007 June 2015
Code Name RV670 PRO Grenada XT
Memory 512 MB 8192 MB
Core Speed 668 MHz 1050 MHz
Memory Speed 1656 MHz 6000 MHz
Power (Max TDP) 75 watts 275 watts
Bandwidth 52992 MB/sec 384000 MB/sec
Texel Rate 10688 Mtexels/sec 184800 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 67200 Mpixels/sec
Unified Shaders 320(64x5) 2816
Texture Mapping Units 16 176
Render Output Units 16 64
Bus Type GDDR3 GDDR5
Bus Width 256-bit 512-bit
Fab Process 55 nm 28 nm
Transistors (Unknown) million 6200 million
Bus PCIe 2.0 x16/AGP 8x PCIe 3.0 ×16
DirectX Version DirectX 10.1 DirectX 12.0
OpenGL Version OpenGL 3.0 OpenGL 4.5

Memory Bandwidth: Bandwidth is the largest amount of data (measured in megabytes per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher 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 amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video 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 number of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 3850 512MB

Amazon.com

Check prices at:

Radeon R9 390X 8G

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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