ATI Radeon X1950 CrossFire Edition vs ATI HD 4855

Primary details

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

Place in the ranking	not rated	1338
Place by popularity	not in top-100	not in top-100
Architecture	TeraScale (2005−2013)	R500 (2005−2007)
GPU code name	RV770	R580+
Market segment	Desktop	Desktop
Release date	3 January 2010 (16 years ago)	10 September 2006 (19 years ago)

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	no data
Core clock speed	575 MHz	650 MHz
Number of transistors	956 million	384 million
Manufacturing process technology	55 nm	90 nm
Power consumption (TDP)	110 Watt	no data
Texture fill rate	18.40	10.40
Floating-point processing power	0.736 TFLOPS	no data
ROPs	16	16
TMUs	32	16
L1 Cache	128 KB	no data
L2 Cache	256 KB	no data

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	PCIe 1.0 x16
Length	220 mm	no data
Width	2-slot	2-slot
Supplementary power connectors	1x 6-pin	1x 6-pin

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	GDDR4
Maximum RAM amount	512 MB	512 MB
Memory bus width	256 Bit	256 Bit
Memory clock speed	900 MHz	1000 MHz
Memory bandwidth	115.2 GB/s	64 GB/s

Connectivity and outputs

This section shows the types and number of video connectors on each GPU. The data applies specifically to desktop reference models (for example, NVIDIA’s Founders Edition). OEM partners often modify both the number and types of ports. On notebook GPUs, video‐output options are determined by the laptop’s design rather than the graphics chip itself.

Display Connectors	1x DVI, 1x HDMI, 1x VGA	1x DVI, 1x VHDCI
HDMI	+	-

API and SDK support

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

DirectX	10.1 (10_1)	9.0c (9_3)
Shader Model	4.1	3.0
OpenGL	3.3	2.0
OpenCL	1.1	N/A
Vulkan	N/A	N/A

Pros & cons summary

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Recency	3 January 2010	10 September 2006
Chip lithography	55 nm	90 nm

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