That HD 545v is the better GPU. It's a bit below a standard Mobility HD 5470.
You can see the performance comparisons in the reviews below.
Also the list of video cards just the right shows the relative performance between a wide range or cards.
Reviews from NotebookCheck
Intel HD Graphics 3DMark 06 score 1514.8 http://www.notebookcheck.net/Intel-Graphics-Media-Accelerator-HD.23065.0.html
ATI Mobility Radeon HD 545v 3DMark 06 score 3836.8http://www.notebookcheck.net/ATI-Mobility-Radeon-HD-545v.30291.0.html