Actually, I wanted to run Trainz 2010 in 30 FPS, not 60 FPS. Also, how come most good Desktop Computers are better for PC Gaming than Laptop Computers (I am aware of what you said about your Desktop having issues with Trainz, but I heard that Desktops are better for PC Gaming)?
Good question!
Desktops are better overall for gaming because the processors and GPU components are different along with everything else. In a laptop, though it may share the same kinds of components, it's all about compromises due to space and heat. With a laptop, the video (GPU) circuits are usually built right on to the motherboard or some kind of daughter card. These are also the mobile versions of the similar desktop chips. Being mobile versions, they will throttle back, slow down, and have other power saving features not found on the desktop brethren. The laptop manufacturers will also compromise the video memory as well. Instead of using the full DDR5 found on the desktop equivalent versions, they will use slower, cooler running mobile versions, and may even put in a lot less. The same goes with the processor. Instead of using a full heat sink or large cooler, the laptop is equipped, for obvious reasons, with a much smaller unit - usually a heat-pipe setup with a turbo fan to draw air from the bottom and across the components and out a side vent.
Memory on a laptop is similar to a desktop, but there are limits to the size, meaning amount that can fit on the DIMMs. This means less memory than the desktops in most cases. This is also done too to keep the heat and cost down as well as these components get expensive.
Hard drives are slower and usually smaller, though SSDs are making headway in this area, however, there is still the issue with heat as SSDs do run very warm due to the nature of the beast. If the laptop is equipped with a platter drive, it is rare to get a machine with a 7200 rpm unit. This is due to cost and due to heat as the faster the drives operate, the more heat is produced.
A full-sized desktop machine, on the other hand, can run components at full power, usually has adequate cooling options, space to add on additional fans, and there is no worry about what size video card can be added. Though, there's a caveat here. Some machines have small cases, which will of course limit the physical size of some components. Power supplies too can be optimized and can be the larger, higher wattage kind as there is no longer a limit to the amount of current draw found on laptops, which aim to conserve power, reduce heat, and be mobile.
So in the end, you pay more for a lot less with laptops. Sure the machines are getting better and faster, and smaller, but it's all about compromising somewhere to make these components fit in a smaller space. And it goes without mentioning too much here, there are exceptions to the rule, however, the consumer pays the price in more ways than one as faster and more powerful laptops are usually heavier than their truly mobile relations.