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Old 2007-10-13, 13:56   #1
dsouza123
 
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Default Double precision GPUs coming very soon

Double precision hardware support is coming soon from both ATI and nVidia GPUs

RV670 aka the Radeon HD 2950: November 19 (formerly November 15)
G92 aka the GeForce 8800 GT: October 29 (formerly November 12)

We learned that G92 and RV670 are sporting dual-precision units
(128, 112 or 96 to be available in G92, RV670 will have 320 units),
albeit it is unknown what type of Binary Floating-Point formats are these units supporting.
Who is supporting IEEE 754 format, 32-bit or 64-bit - time will tell.

http://www.theinquirer.net/gb/inquir...gpgpu-monsters
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Old 2007-10-13, 18:59   #2
dsouza123
 
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The following link gives more general information about the ATI RV670 cards
including an image of an AMD slide with a bullet point listing double precision floating point.

http://www.xbitlabs.com/news/video/d...930223300.html
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Old 2007-10-13, 22:39   #3
paulunderwood
 
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This is simulated double precision.

Ati has not released their CTM (close to metal) compiler. It is vaporware.
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Old 2007-10-14, 20:39   #4
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My assumption is, that they implemented DP in a way similar to what has been done in Cell's SPEs. Full featured DP with the same throughput as SP calculations or even half the throughput (filling the registers with 2 doubles instead of 4 singles) would cost a few hundred million transistors more and need a lot of power.

A software emulation via driver/CTM compiler would probably be far from being useful (since this could have been done already).
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Old 2007-10-15, 02:20   #5
dsouza123
 
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CUDA 1.0 ( C for NVidia GPUs) now documents the PTX assembly language.

http://www.behardware.com/articles/6...ical-uses.html

----------------
The CUDA Developer SDK provides examples with source code to help you get started with CUDA.
Examples include:
Parallel bitonic sort
Matrix multiplication
Matrix transpose
Performance profiling using timers
Parallel prefix sum (scan) of large arrays
Image convolution
1D DWT using Haar wavelet <-- is this like what Prime95 uses ?
OpenGL and Direct3D graphics interoperation examples
CUDA BLAS and FFT library usage examples
CPU-GPU C and C++ code integration

http://developer.nvidia.com/object/cuda.html

NVidia is also releasing a Tesla line of GPU cards,
calculation accelerators without video connections.

The base model C870 has 1.5 GB memory and a price to match $1299.
---------------------------------------------------------
Correction: The G92 GPU will be in the GeForce 9800 cards.
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