ATI Radeon HD 3870 Mac Edition vs R9 390X

Primary details

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

Place in the ranking	290	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	8.57	no data
Power efficiency	6.20	no data
Architecture	GCN 2.0 (2013−2017)	TeraScale (2005−2013)
GPU code name	Grenada	RV670
Market segment	Desktop	Desktop
Design	reference	no data
Release date	18 June 2015 (10 years ago)	12 June 2008 (17 years ago)
Launch price (MSRP)	$429	no data

Cost-effectiveness evaluation

The higher the ratio, the better. We use the manufacturer's recommended prices.

Performance to price scatter graph

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	2816	320
Core clock speed	no data	777 MHz
Boost clock speed	1050 MHz	no data
Number of transistors	6,200 million	666 million
Manufacturing process technology	28 nm	55 nm
Power consumption (TDP)	275 Watt	106 Watt
Texture fill rate	184.8	12.43
Floating-point processing power	5.914 TFLOPS	0.4973 TFLOPS
ROPs	64	16
TMUs	176	16
L1 Cache	704 KB	no data
L2 Cache	1024 KB	256 KB

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).

Bus support	PCIe 3.0	no data
Interface	PCIe 3.0 x16	PCIe 2.0 x16
Length	275 mm	241 mm
Width	2-slot	1-slot
Supplementary power connectors	1 x 6-pin, 1 x 8-pin	1x 6-pin
Bridgeless CrossFire	+	-

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
High bandwidth memory (HBM)	-	no data
Maximum RAM amount	0 MB	512 MB
Memory bus width	512 Bit	256 Bit
Memory clock speed	1050 MHz	1126 MHz
Memory bandwidth	384 GB/s	72.06 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	2x DVI, 1x HDMI, 1x DisplayPort	2x DVI, 1x S-Video
Eyefinity	+	-
Number of Eyefinity displays	6	no data
HDMI	+	-
DisplayPort support	+	-

Supported technologies

Supported technological solutions. This information will prove useful if you need some particular technology for your purposes.

CrossFire	+	-
FreeSync	+	-
PowerTune	+	-
TrueAudio	+	-
VCE	+	-
DDMA audio	+	no data

API and SDK support

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

DirectX	DirectX® 12	10.1 (10_1)
Shader Model	6.3	4.1
OpenGL	4.6	3.3
OpenCL	2.0	N/A
Vulkan	+	N/A
Mantle	+	-

Pros & cons summary

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Recency	18 June 2015	12 June 2008
Chip lithography	28 nm	55 nm
Power consumption (TDP)	275 Watt	106 Watt

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