|The GTX 460 uses GDDR5 memory, which is quad pumped. 950*4 = 3800MHz|
Don't worry about your GPU clocks. It will always run the core clock, shader clock, and memory clock at maximum speed when required.
Socket 939 | Dual-core Opteron 185 @ 3.2GHz | 4GB | 1.0TB | Win7 x64
GeForce GTX 460 1GB | X-Fi Ti Pro | A8N32-SLI Deluxe | Antec P182