Limitations
- Compared, for example, to traditional floating point accelerators such as the 64-bit floating point (FP64) CSX600 math processor from ClearSpeed that is used in today's supercomputers, current and older GPUs from ATI (and NVIDIA) are running on 32-bit processors with only single-precision data capabilities.
- Instead of the 64-bit double-precision capability of supercomputers, the second generation of stream processors (the AMD FireStream 9170) is able to handle double-precision data. This is a result of FP32 filtering support contained as part of the requirements of the DirectX 10.1 API. However, the double precision operations (frequently used in supercomputer benchmarks) can achieve only half of the performance in theory compared to single precision operations, the actual figures may be lower, as the GPU do not have full double-precision units implemented.
(с) http://en.wikipedia.org/wiki/AMD_FireStream
Надеюсь, что перевод НЕ потребуется. Потому как в противном случае теряется и сам смысл обсуждения.