ATI Radeon HD 3870 AGP vs R9 285X

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	GCN 3.0 (2014−2019)	TeraScale (2005−2013)
GPU code name	Tonga	RV670
Market segment	Desktop	Desktop
Release date	no data (2024 years ago)	no data (2024 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	2048	320
Core clock speed	1002 MHz	777 MHz
Number of transistors	5,000 million	666 million
Manufacturing process technology	28 nm	55 nm
Power consumption (TDP)	200 Watt	106 Watt
Texture fill rate	128.3	12.43
Floating-point processing power	4.104 TFLOPS	0.4973 TFLOPS
ROPs	32	16
TMUs	128	16

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 3.0 x16	AGP 8x
Length	267 mm	241 mm
Width	2-slot	2-slot
Supplementary power connectors	1x 6-pin + 1x 8-pin	1x 8-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	3 GB	512 MB
Memory bus width	384 Bit	256 Bit
Memory clock speed	1375 MHz	1126 MHz
Memory bandwidth	264.0 GB/s	72.06 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	2x DVI, 1x HDMI 1.4a, 1x DisplayPort 1.2	2x DVI, 1x S-Video
HDMI	+	-

API compatibility

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

DirectX	12 (12_0)	10.1 (10_1)
Shader Model	6.5	4.1
OpenGL	4.6	3.3 (full) 4.0 (partial)
OpenCL	2.1	N/A
Vulkan	1.2.170	N/A

Pros & cons summary

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Maximum RAM amount	3 GB	512 MB
Chip lithography	28 nm	55 nm
Power consumption (TDP)	200 Watt	106 Watt

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