Mobility Radeon HD 4850 Mac Edition vs GeForce GT 640 Rev. 2

Primary Details

GPU architecture, market segment, value for money and other general parameters compared.

Place in performance ranking	682	not rated
Place by popularity	not in top-100	not in top-100
Cost-Effectiveness Evaluation	0.18	no data
Architecture	Kepler 2.0 (2013−2015)	TeraScale (2005−2013)
GPU code name	GK208	M98
Market segment	Desktop	Desktop
Release date	29 May 2013 (10 years ago)	28 August 2009 (14 years ago)
Launch price (MSRP)	$89	no data
Current price	$230 (2.6x MSRP)	no data

Cost-Effectiveness Evaluation

Performance to price ratio. The higher, the better.

Detailed Specifications

General performance parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. These parameters indirectly speak of performance, but for precise assessment you have to consider their benchmark and gaming test results. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.

Pipelines / CUDA cores	384	800
Core clock speed	1046 MHz	503 MHz
Number of transistors	915 million	956 million
Manufacturing process technology	28 nm	55 nm
Power consumption (TDP)	49 Watt	no data
Texture fill rate	33.47	20.12
Floating-point performance	803.3 gflops	804.8 gflops

Form Factor & Compatibility

Information on compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop graphics cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).

Interface	PCIe 2.0 x8	PCIe 2.0 x16
Length	145 mm	no data
Width	1-slot	no data
Supplementary power connectors	None	no data

Memory type	GDDR5	GDDR3
Maximum RAM amount	1 GB	512 MB
Memory bus width	64 Bit	256 Bit
Memory clock speed	5008 MHz	1700 MHz
Memory bandwidth	40.06 GB/s	54.4 GB/s

Connectivity and Outputs

Types and number of video connectors present on the reviewed GPUs. As a rule, data in this section is precise only for desktop reference ones (so-called Founders Edition for NVIDIA chips). OEM manufacturers may change the number and type of output ports, while for notebook cards availability of certain video outputs ports depends on the laptop model rather than on the card itself.

Display Connectors	1x DVI, 1x HDMI, 1x VGA	No outputs
HDMI	+	no data

API Compatibility

List of supported graphics and general-purpose computing APIs, including their specific versions.

DirectX	12 (11_0)	10.1 (10_1)
Shader Model	5.1	4.1
OpenGL	4.6	3.3
OpenCL	1.2	1.1
Vulkan	1.1.126	N/A
CUDA	3.5	no data

Pros & Cons Summary

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Recency	29 May 2013	28 August 2009
Maximum RAM amount	1 GB	512 MB
Chip lithography	28 nm	55 nm

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Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.

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