Iris Plus Graphics 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	731
Place by popularity	not in top-100	not in top-100
Power efficiency	no data	21.97
Architecture	TeraScale (2005−2013)	Generation 11.0 (2019−2021)
GPU code name	RV770	Ice Lake GT2
Market segment	Desktop	Desktop
Release date	3 January 2010 (16 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. Real power consumption of some graphics cards can well exceed their nominal TDP, especially if overclocked.

Pipelines / CUDA cores	640	512
Core clock speed	575 MHz	no data
Boost clock speed	no data	1000 MHz
Number of transistors	956 million	no data
Manufacturing process technology	55 nm	10 nm
Power consumption (TDP)	110 Watt	15 Watt
Texture fill rate	18.40	32.00
Floating-point processing power	0.736 TFLOPS	1.024 TFLOPS
ROPs	16	8
TMUs	32	32
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 3.0 x1
Length	220 mm	no data
Width	2-slot	IGP
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	System Shared
Maximum RAM amount	512 MB	System Shared
Memory bus width	256 Bit	System Shared
Memory clock speed	900 MHz	System Shared
Memory bandwidth	115.2 GB/s	no data

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	No outputs
HDMI	+	-

API and SDK support

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

DirectX	10.1 (10_1)	12 (12_1)
Shader Model	4.1	no data
OpenGL	3.3	4.6
OpenCL	1.1	no data
Vulkan	N/A	-

Pros & cons summary

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Chip lithography	55 nm	10 nm
Power consumption (TDP)	110 Watt	15 Watt