All of them are Single Precision.
AMD website:
AMD Radeon™ HD 6300M Series
Listed under the Performance Specifications tab
* Engine clock speed: 500-750 MHz
*
Processing power (single precision): 80-120 GigaFLOPS
* Polygon throughput: 125-187.5M polygons/sec
* Data fetch rate (32-bit): 16-24 billion fetches/sec
* Texel fill rate (bilinear filtered): 4-6 Gigatexels/sec
* Pixel fill rate: 2-3 Gigapixels/sec
* Anti-aliased pixel fill rate: 8-12 Gigasamples/sec
* Memory clock speed: 800-900 MHz
* Memory data rate: 1.6-1.8 Gbps
* Memory bandwidth: 12.8-14.4 GB/sec