AMD Radeon HD 8770 vs AMD Radeon HD 8990 Full Specs
896 Shaders 1GHz | 4,096 Shaders 1GHz |
2GB GDDR596GB/s | 6GB GDDR5576GB/s |
·· 1.79 TFLOPS | ·· 8.19 TFLOPS |
Form Factor PCIe Card | Form Factor PCIe Card |
TDP 85W | TDP 375W |
Power Connectors - 1x 6-Pin | Power Connectors 2x 8-Pin - |
Radeon HD 87701.79 TFLOPSFP32
Radeon HD 89908.19 TFLOPSFP32 (2x 4.1 TFLOPS)Clock Speed ·· | Clock Speed ··· |
Peak OPS 1.79 TFLOPSFP32 | Peak OPS 8.19 TFLOPSFP32 |
FP32 1.79 TFLOPS | FP32 8.19 TFLOPS |
FP64 112 GFLOPS | FP64 2.05 TFLOPS |
Pixel Rate 16 GPixel/s | Pixel Rate 32 GPixel/s |
Texture Rate 56 GTexel/s | Texture Rate 128 GTexel/s |
Shaders 896 Shaders | Shaders 4,096 Shaders |
TMUs 56 TMUs | TMUs 256 TMUs |
ROPs 16 ROPs | ROPs 64 ROPs |
CUs 14 CUs | CUs 64 CUs |
Base Clock - | Base Clock 950MHz |
Boost Clock 1GHz | Boost Clock 1GHz |
L2 Cache 256KB shared | L2 Cache 768KB shared |
2GB GDDR5 | 6GB GDDR5 |
Memory Bus 128-bit | Memory Bus 384-bit |
Memory Speed 6GT/s | Memory Speed 6GT/s |
Memory Bandwidth 96GB/s | Memory Bandwidth 576GB/s |
TDP 85W | TDP 375W |
Multi-Monitor 3 | Multi-Monitor 4 |
2x Mini DisplayPort 1.2 | 4x Mini DisplayPort 1.2 |
1x HDMI 1.4 | - |
1x DVI-I Dual-Link | 1x DVI-I Dual-Link |
Encoder Model VCE 2.0 | Encoder Model VCE 1.0 |
Decoder Model UVD 4.2 | Decoder Model UVD 3.2 |
Form Factor PCIe Card | Form Factor PCIe Card |
PCIe 2-Slots | PCIe 2-Slots |
Height 111 mm (4.37")Width 183 mm (7.21")Depth 37 mm (1.46") | Height 115 mm (4.53")Width 304 mm (11.97")Depth 38 mm (1.5") |
Cooling Open-Air 1x Fan | Cooling Open-Air 3x Fans |
Power Connectors 1x 6-Pin | Power Connectors 2x 8-Pin |
Manufacturer | Manufacturer |
Chip Designer | Chip Designer |
Architecture | Architecture |
Family | Family |
Branding  | Branding |
Codename Bonaire | Codename Tahiti |
Chip Variant Bonaire XT | Chip Variant Tahiti LE |
Market Segment Desktop | Market Segment Desktop |
Release Date Sep 2, 2013 | Release Date Apr 24, 2013 |
Foundry TSMC | Foundry TSMC |
Fabrication Node 28nm | Fabrication Node 28nm |
Die Size 160mm² | Die Size 352mm² |
Transistor Count 2.1 Billion | Transistor Count 4.3 Billion |
Transistor Density 13 MTr/mm² | Transistor Density 12.25 MTr/mm² |
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