Sapphire Radeon HD 4650 1GB DDR2 AGP vs HD 4650 1GB DDR2 PCI-E

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Sapphire Radeon HD 4650 1GB DDR2 AGP vs HD 4650 1GB DDR2 PCI-E

Theoretical performance comparison

Each GPU has several vital theoretical parameters that influence real-world game, 3D graphics and compute performance. They are texture fillrate, pixel fillrate, memory bandwidth, single- and double-precision performance. Below we explain why these characteristics are important and which card has better specs.

Pixel fill rate (gigapixels/s)

4.8

3.6

2.4

1.2

4.8

Higher is better

Pixel fillrate number shows how many pixels a graphics card can draw on screen and off screen. The higher this number, the higher maximum display resolution and frame rate the GPU can support. There are two characteristics that influence the maximum pixel fillrate. These are graphics frequency and the number of ROPs (Raster Operations Pipelines). Since both characteristics are identical between cards, their pixel fillrate is also equal.

- Sapphire Radeon HD 4650 1GB DDR2 AGP

- Sapphire Radeon HD 4650 1GB DDR2 PCI-E

Texture fill rate (gigatexels/s)

19.2

Higher is better

Two factors, that affect the maximum theoretical texture fillrate, are graphics clock speed and the number of TMUs (Texture Mapping Units). Because both models have the same number of TMUs and the same graphics frequency, their texture fillrate is identical.

Single Precision performance (GFLOPS)

300

240

180

120

192

Higher is better

Single Precision performance indicates how many single-precision floating point operations the graphics card can execute per second. The performance is expressed in billions of Floating Point Operations Per Second, or GFLOPS. Since FP calculations are performed by shaders, stream processors or CUDA cores, the performance is directly proportional to their number. It also depends on the processor clock speed. These two GPUs have the same maximum single-precision performance.

Memory bandwidth (GB/s)

12.8

Higher is better

Memory bandwidth of both graphics cards is identical.

- Sapphire Radeon HD 4650 1GB DDR2 AGP

- Sapphire Radeon HD 4650 1GB DDR2 PCI-E

Specs comparison

All rows with different specifications or features are highlighted.


General information
Market segment	Desktop
Manufacturer	Sapphire
Model	Radeon HD 4650 1GB DDR2 AGP	Radeon HD 4650 1GB DDR2 PCI-E
Based on	ATI Radeon HD 4650 DDR2
Architecture / Interface
Die name
Architecture
Fabrication process
Bus interface
Cores / shaders
Color ROPs
Stream processors
Pixel fill rate
Texture units
Texture fill rate
Single Precision performance
Clocks / Memory
Graphics clock	600 MHz
Memory size	1024 MB
Memory type	DDR2
Memory clock
Memory interface width
Memory bandwidth
Other features
Maximum crossfire options
Maximum power