AMD Radeon HD 6970M Mac Edition vs AMD Radeon R7 250X

Graphics Processor

GPU model Blackcomb Cape Verde
GPU variant Blackcomb XT (216-0811000) Cape Verde XT
Architecture TeraScale 2 GCN 1.0
Foundry TSMC TSMC
Manufacturing process 40 nm 28 nm
Number of transistors 1,700 million 1,500 million
Die size 212 mm² 123 mm²

Mobile graphics

Release date Aug 25th, 2011
Generation Vancouver (HD 6900M)
Production End-of-life
Interface MXM-B (3.0)
Predecessor Manhattan
Successor London

Clocks

GPU clock 680 MHz 950 MHz
Memory clock 900 MHz 3.6 Gbps effective 1125 MHz 4.5 Gbps effective

Memory Configuration

Memory size 2 GB 1024 MB
Memory type GDDR5 GDDR5
Memory bus width 256 bit 128 bit
Bandwidth 115.2 GB/s 72.00 GB/s

Render Configuration

Shading units 960 640
TMUs 48 40
ROPs 32 16
Compute units 12 10
Cache L1 8 KB (per CU) 16 KB (per CU)
Cache L2 512 KB 256 KB

Performance

Pixel rate 21.76 GPixel/s 15.20 GPixel/s
Texture rate 32.64 GTexel/s 38.00 GTexel/s
FP32 (float) performance 1,306 GFLOPS 1,216 GFLOPS
FP64 (double) performance 76.00 GFLOPS (1:16)

Dimensions & Outputs

Slot width MXM Module Dual-slot
TDP 75 W 80 W
Outputs No outputs 1x DVI1x HDMI2x mini-DisplayPort
Power connectors None 1x 6-pin
Board number C296 C441, C698
Length 210 mm 8.3 inches
Suggested PSU 250 W

API Support & Features

DirectX 11.2 (11_0) 12 (11_1)
OpenGL 4.4 4.6
OpenCL 1.2 1.2
Vulkan 1.2
Shader model 5.0 5.1

Other Features

Graphics Card

Release date Feb 13th, 2014
Generation Volcanic Islands
Production End-of-life
Launch price 99 USD
Interface PCIe 3.0 x16
Predecessor Sea Islands
Successor Pirate Islands

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