The Lenovo Y510p is a popular gaming laptop for under $1000. There are basically two models; one with a 1366x768 resolution screen for $800 and one with a 1920x1080 resolution screen for $950. The higher resolution screen means lower performance in games, but a larger desktop so that you have have multiple windows for easier multitasking. The $800 has the marginally faster nVidia GT 775m while the $950 model has the GT 750m. Both have the same quad core i7-4700mq CPU. The $950 also has a 24GB SSD to help slightly improve the hard drive performance.
A very simple comparison to the desktop PC parts above:
The i5-4670k has a base clockspeed of 3.4GHz and using Turbo Boost it can overclock itself up to a max of 3.8GHz (if one is used and temps are not too hot). Being a "k" model, you can also overclock the CPU by increasing the multipliers.
The i7-4700mq has a base speed of 2.4GHz and using Turbo Boost it can overclock itself up to a max of 3.4GHz (if one is used and temps are not too hot). The CPU cannot be overclocked by owners at all beyond Turbo Boost. However, it does have Hyper Threading, but the only game that so far benefit from HT is Battlefield 4.
However, the big difference in performance is between the mobile nVidia GT 750m / GT 755m vs the desktop Radeon R9 280x. Based on Notebookcheck.net, the nVidia GT 750m and 755m are both considered to be slower than the Radeon HD 5770. The modern day equivalent (almost equal performance) to the HD 5770 is the Radeon HD 7750.
Here is a relative performance chart of desktop GPUs. The MSI R9 280X GAMING graphics card is the baseline GPU (100%) and is marginally faster than the reference design R9 280X (97%). The Radeon HD 7750 is also present and it has 28% the performance of the MSI R9 280X.
As I stated earlier, the nVidia GT 750m / GT 755m are both slower than the Radeon HD 5770 / HD 7750. For simplicity let's say it has 25% the performance of the MSI R9 280X. Turn it around and it means the MSI R9 280X is 4 times more powerful than the nVidia GT 750m / 755m.