But it isn't slower because of the faster memory bandwidth... in fact repainting the entire screen is faster.
Graphics memory bandwidth is measured in GB/s nowadays:
karlos@Megaburken-II:~/NVIDIA_CUDA_SDK/bin/linux/release$ ./bandwidthTest
Running on......
device 0:GeForce GTX 260
Quick Mode
Host to Device Bandwidth for Pageable memory
.
Transfer Size (Bytes) Bandwidth(MB/s)
33554432 2473.4
Quick Mode
Device to Host Bandwidth for Pageable memory
.
Transfer Size (Bytes) Bandwidth(MB/s)
33554432 2264.0
Quick Mode
Device to Device Bandwidth
.
Transfer Size (Bytes) Bandwidth(MB/s)
33554432 104592.3
&&&& Test PASSED