Weston vs ATI Radeon HD 4855

Primary details

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

Place in the ranking	not rated	not rated
Place by popularity	not in top-100	not in top-100
Architecture	TeraScale (2005−2013)	GCN 3.0 (2014−2019)
GPU code name	RV770	Weston
Market segment	Desktop	Desktop
Release date	3 January 2010 (14 years ago)	no data

Detailed specifications

General parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.

Pipelines / CUDA cores	640	384
Core clock speed	575 MHz	no data
Number of transistors	956 million	1,550 million
Manufacturing process technology	55 nm	28 nm
Power consumption (TDP)	110 Watt	no data
Texture fill rate	18.40	no data
Floating-point processing power	0.736 gflops	no data
ROPs	16	8
TMUs	32	24

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 x16	no data
Length	220 mm	no data
Width	2-slot	no data
Supplementary power connectors	1x 6-pin	no data

VRAM capacity and type

Parameters of VRAM installed: its type, size, bus, clock and resulting bandwidth. Integrated GPUs have no dedicated video RAM and use a shared part of system RAM.

Memory type	GDDR5	no data
Maximum RAM amount	512 MB	no data
Memory bus width	256 Bit	no data
Memory clock speed	3600 MHz	no data
Memory bandwidth	115.2 GB/s	no data

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 data
HDMI	+	-

API compatibility

List of supported 3D and general-purpose computing APIs, including their specific versions.

DirectX	10.1 (10_1)	12 (12_0)
Shader Model	4.1	6.5
OpenGL	3.3	4.6
OpenCL	1.1	2.1
Vulkan	N/A	1.2.170

Pros & cons summary

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Chip lithography

55 nm

28 nm

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