I'm looking at Lenovo laptops and trying to decide between the W510 and T510 series.
The W510 offers the i7 720QM and 820QM chips.
The T510 offers the 620M chip.
I'm a business user: I run multiple applications at once, and I occasionally do high-load things like batch processing or hundreds of pages of scans. Most of my programs (acrobat pro, omnipage pro, lightroom, photoshop) use multiple cores very well. I'm be running win7 ultimate 64.
I am having a devil of a time deciding which is likely to be faster. If it's close, I'll probably buy the T510: it's cheaper, and only 35w. If there's a serious benefit to the 820qm I'd like to know.
The QM chips are quad core, while the M chip is dual core. The quads will be faster for anything multithreaded. The dual will be faster for single threaded, it will run cooler, and it will give a significantly longer battery life (especially since it is 32nm).