noob question about mobo
H61 is the chipset used by the motherboard.
The chipset is connected to the processor through a dedicated fast connection, and to this chipset almost all other components are connected to. For example, the chipset holds inside the SATA controller (creates the sata connectors) , usb controllers (to create usb ports), reads and runs the BIOS, creates a few pci express lanes for more pci express slots, to this chipset the onboard sound and network cards are connected and so on.
Here's a diagram for the H61 chipset :

Other chipsets can have more features (like more usb 3 ports) or can have more business like features enabled like RAID 5 support on the sata controller (Intel's way to make more money by segmenting the market). Here's for example a diagram for the Z77 chipset, to see the differences between the H61 above and this one

As you can see Z77 has 4 extra usb 3.0 ports built in , 2 extra pci express lanes (motherboard makers can take those 8 lanes and use them in any way they want, for example to create a x4 slot on the card and use the 4 other lanes as four x1 connections between onboard devices like an extra usb 3.0 controller and the chipset for example.
The video card performance is typically not affected by the chipset choice because you usually insert the video card in a pci express slot which is wired directly the processor socket, so there's independent communication channels between cpu-video card and cpu-chipset

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