Join Us On Facebook

Compare any two graphics cards:
VS

Radeon HD 4650 512MB vs Radeon HD 6450 (OEM) 1GB

Intro

The Radeon HD 4650 512MB comes with core speeds of 600 MHz on the GPU, and 500 MHz on the 512 MB of DDR2 memory. It features 320(64x5) SPUs along with 32 Texture Address Units and 8 ROPs.

Compare those specifications to the Radeon HD 6450 (OEM) 1GB, which uses a 40 nm design. AMD has clocked the core speed at 750 MHz. The GDDR5 RAM is set to run at a frequency of 900 MHz on this card. It features 160 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 1GB 31 Watts
Radeon HD 4650 512MB 55 Watts
Difference: 24 Watts (77%)

Memory Bandwidth

The Radeon HD 6450 (OEM) 1GB should theoretically be a lot faster than the Radeon HD 4650 512MB overall. (explain)

Radeon HD 6450 (OEM) 1GB 28800 MB/sec
Radeon HD 4650 512MB 16000 MB/sec
Difference: 12800 (80%)

Texel Rate

The Radeon HD 4650 512MB is much (about 220%) faster with regards to texture filtering than the Radeon HD 6450 (OEM) 1GB. (explain)

Radeon HD 4650 512MB 19200 Mtexels/sec
Radeon HD 6450 (OEM) 1GB 6000 Mtexels/sec
Difference: 13200 (220%)

Pixel Rate

The Radeon HD 4650 512MB should be a lot (about 60%) more effective at full screen anti-aliasing than the Radeon HD 6450 (OEM) 1GB, and also capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 4650 512MB 4800 Mpixels/sec
Radeon HD 6450 (OEM) 1GB 3000 Mpixels/sec
Difference: 1800 (60%)

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

Radeon HD 4650 512MB

Amazon.com

Radeon HD 6450 (OEM) 1GB

Amazon.com

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

Model Radeon HD 4650 512MB Radeon HD 6450 (OEM) 1GB
Manufacturer AMD AMD
Year Sep 10, 2008 February 2011
Code Name RV730 PRO Caicos
Fab Process 55 nm 40 nm
Bus PCIe 2.0 x16, AGP 8x PCIe 2.1 x16
Memory 512 MB 1024 MB
Core Speed 600 MHz 750 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 500 MHz (1000 MHz effective) 900 MHz (3600 MHz effective)
Unified Shaders 320(64x5) 160
Texture Mapping Units 32 8
Render Output Units 8 4
Bus Type DDR2 GDDR5
Bus Width 128-bit 64-bit
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1
Power (Max TDP) 55 watts 31 watts
Shader Model 4.1 5.0
Bandwidth 16000 MB/sec 28800 MB/sec
Texel Rate 19200 Mtexels/sec 6000 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 3000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Comments

Be the first to leave a comment!

Your email address will not be published.


You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>

Spam Protection by WP-SpamFree