ATI Mobility Radeon X1800 XT vs ATI Mobility HD 3870

Primary details

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

Place in the ranking	1087	not rated
Place by popularity	not in top-100	not in top-100
Power efficiency	1.74	no data
Architecture	TeraScale (2005−2013)	R500 (2005−2007)
GPU code name	M88	M58
Market segment	Laptop	Laptop
Release date	4 June 2008 (17 years ago)	1 March 2006 (20 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	320	no data
Core clock speed	660 MHz	550 MHz
Number of transistors	666 million	321 million
Manufacturing process technology	55 nm	90 nm
Power consumption (TDP)	55 Watt	no data
Texture fill rate	10.56	8.800
Floating-point processing power	0.4224 TFLOPS	no data
ROPs	16	16
TMUs	16	16
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).

Laptop size	large	no data
Interface	PCIe 2.0 x16	PCIe 1.0 x16

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	GDDR3	GDDR3
Maximum RAM amount	512 MB	256 MB
Memory bus width	256 Bit	256 Bit
Memory clock speed	850 MHz	650 MHz
Memory bandwidth	54.4 GB/s	41.6 GB/s
Shared memory	-	-

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

No outputs

No outputs

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	N/A	N/A
Vulkan	N/A	N/A

Pros & cons summary

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Recency	4 June 2008	1 March 2006
Maximum RAM amount	512 MB	256 MB
Chip lithography	55 nm	90 nm