NVIDIA has good laugh with "FASTRA" Super Computer - Page 2

jmke · 4th February 2010, 10:15

DP is useful because it delivers more accurate results

Quote:

Refers to a type of floating-point number that has more precision (that is, more digits to the right of the decimal point) than a single-precision number. The term double precision is something of a misnomer because the precision is not really double. The word double derives from the fact that a double-precision number uses twice as many bits as a regular floating-point number. For example, if a single-precision number requires 32 bits, its double-precision counterpart will be 64 bits long.

The extra bits increase not only the precision but also the range of magnitudes that can be represented. The exact amount by which the precision and range of magnitudes are increased depends on what format the program is using to represent floating-point values.

4th February 2010, 21:22

Quote:

Originally Posted by wutske

Then don't use DP

As most scientific computing groups consider accuracy to be paramount most of them use double-precision workloads. It was specifically done to ensure groups couldn't build FASTRA computers without paying more for Tesla cards. They'd get better performance from RV870 instead of GeForce now.

5th February 2010, 10:23

Quote:

Originally Posted by Kougar

As most scientific computing groups consider accuracy to be paramount most of them use double-precision workloads. It was specifically done to ensure groups couldn't build FASTRA computers without paying more for Tesla cards. They'd get better performance from RV870 instead of GeForce now.

The first CUDA cards introduced a while ago also sucked at DP, so Tesla cards aren't the reason why the 'older' cards don't do DP very well.
DP is indeed interesting for scientific groups who want accuracy, but sometimes real-time processing is more important that a bit more accurate results.

5th February 2010, 22:45

Quote:

Originally Posted by wutske

The first CUDA cards introduced a while ago also sucked at DP, so Tesla cards aren't the reason why the 'older' cards don't do DP very well.
DP is indeed interesting for scientific groups who want accuracy, but sometimes real-time processing is more important that a bit more accurate results.

Why are you comparing to older cards? GF100 hasn't yet been sold as CUDA/Tesla cards, so it's rather silly to compare to past models. GF100 was designed especially for DP performance unlike GT200.

DP FMA rate:
GT200 offers 88.5 Gflops
GF100 Tesla offers 744 Gflops
GF100 GeForce offers 186 Gflops
(Source TheTechReport)

I'm not sure what percentage of the market writes for SP FMA and runs calculations twice versus DP FMA and runs them once, but there are enough organizations that built GT200 GeForce computing platforms that this will certainly affect quite a few of them.

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