I was confused about that as well initially.
Your first pick has a designated card which performs better than the one in your second choice, but it also has an IGPU which can use up to 512 MB (The 1.5 comes from 1 GB dedicated memory on your graphics card plus 512 mb of shared memory for the IGPU)of your memory to . . . help? As far as I know you can't do that though but I have little laptop expertise.
But yes, when looking at graphics choose the 1 GB AMD Radeon HD 7670M Dedicated over Intel HD Graphics 4000
And whatever 512 MB AMD Radeon HD 7640G Graphics Integrated adds to the mix will help I suppose.
Dedicated card beats integrated by like 3-4 years (if your dedicated card is 4 years old the newest IGPU may perform similarly)
My initial post was slightly off btw. I linked and compared both IGPUs, where I should have linked and compared the dedicated vs the IGPUhttp://www.notebookcheck.net/AMD-Radeon-HD-7670M.69483.0.htmlhttp://www.notebookcheck.net/Intel-HD-Graphics-4000.69168.0.html
There are game reviews at the bottom, check out what you want to play. If you want it for other purposes you may need to look at the benchmarks themselves. There are a lot of different fps predictions on the Intel check because even more than the dedicated card it depends on what system it is embedded in.