AMD Radeon HD 6990M vs AMD Radeon HD 8770 OEM
GPU · Specs Compare
Graphics Card
Release Date
Jul 2011
Sep 2013
Generation
Vancouver
Sea Islands
Type
Mobile
Desktop
Bus Interface
MXM-B (3.0)
PCIe 3.0 x16
Clock Speeds
Memory Clock
900 MHz
1500 MHz
Memory
Memory Size
2GB
1024MB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
128bit
Bandwidth
115.2GB/s
96.00GB/s
Render Config
Compute Units
14
14
Shading Units
1120
896
TMUs
56
56
ROPs
32
16
L1 Cache
8 KB (per CU)
16 KB (per CU)
L2 Cache
512 KB
256 KB
Theoretical Performance
Pixel Rate
22.88 GPixel/s
16.80 GPixel/s
Texture Rate
40.04 GTexel/s
58.80 GTexel/s
FP32 (float)
1.602 TFLOPS
1.882 TFLOPS
FP64 (double)
—
117.6 GFLOPS
Graphics Processor
GPU Name
Blackcomb
Bonaire
GPU Variant
Blackcomb XTX(216-0811030)
Bonaire XT(215-0839039)
Architecture
TeraScale 2
GCN 2.0
Foundry
TSMC
TSMC
Process Size
40 nm
28 nm
Transistors
1.7 billion
2.08 billion
Die Size
212 mm²
160 mm²
Board Design
TDP
100W
85W
Outputs
No outputs
1x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
Power Connectors
None
1x 6-pin
Suggested PSU
—
250 W
Graphics Features
DirectX
11.2 (11_0)
12 (12_0)
OpenGL
4.4
4.6
OpenCL
1.2
2.0
Vulkan
N/A
1.2
Shader Model
5.0
6.3
▲ Specs Compare
Data sourced from official specifications and benchmark tests.