AMD ATI Radeon HD 3800 Series User Manual download pdf (Page 17)

Beyond Programmable Shading: Fundamentals

All slides © 2008 Advanced Micro Devices, Inc. Used with permission.

All slides © 2008 Advanced Micro Devices, Inc. Used with permission.

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ATI Radeon™ HD 4870 Computation Highlights

• >100 GB/s memory bandwidth

– 256b GDDR5 interface

• Targeted for handling thousands

of simultaneous lightweight

threads

• 800 (160x5) stream processors

– 640 (160x4) basic units

(FMAC, ADD/SUB, etc.)

~1.2 TFlops theoretical peak

– 160 enhanced transcendental units

(adds COS, LOG, EXP, RSQ, etc.)

– Support for INT/UINT in all units

(ADD/SUB, AND, XOR, NOT, OR,

etc.)

– 64-bit double precision FP support

1/5 single precision rate (~250GFlops

theoretical performance)

4 SIMDs -> 10 SIMDs

– 2.5X peak performance increase

over ATI Radeon™ 3870

– ~1.2 TFlops FP32 theoretical peak

– ~250 GFlops FP64 theoretical peak

Scratch-pad memories

– 16KB per SIMD (LDS)

– 16KB across SIMDs (GDS)

Synchronization capabilities

Compute Shader

– Launch work without rasterization

– “Linear” scheduling

– Faster thread launch

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