Other differences between the two boards:
1) The P8Z77-V LX has one additional PCI-Legacy slot for a total of three PCI slots. The P8Z77-V has two PCI-Legacy slots.
2) The P8Z77-V LX makes do with a Realtek GbE that steals one PCI-e 2.0 lane off of the PCH. The regular P8Z77-V uses an Intel GbE with a dedicated PHY connection.
3) The P8Z77-V LX has onboard audio that's inferior to the one on the P8Z77-V: Although both use Realtek audio controllers, the one on the P8Z77-V LX is the lesser-specced ALC887 versus the P8Z77-V's ALC892.
4) The P8Z77-V has two extra SATA 6.0 Gbps ports controlled by an onboard ASMedia controller (in addition to the two SATA 6.0 Gbps ports and the four SATA 3.0 Gbps ports native to the Z77 chipset). The P8Z77-V LX has only the Intel SATA ports.
5) The P8Z77-V supports SLI in addition to Crossfire. The P8Z77-V LX supports only Crossfire.
Also, there are two additional models in between the P8Z77-V LX and the P8Z77-V in the Asus Z77 regular ATX board lineup: The P8Z77-V LE has the more mainstream ALC892 audio controller instead of the LX's ALC887. The P8Z77-V LK has the secondary PCI-e x16 slot running at PCI-e 3.0 x8 but one fewer PCI-Legacy slot. That allows the P8Z77-V LK to support SLI in addition to Crossfire. As such, the P8Z77-V LK is a cut-down version of the plain P8Z77-V, omitting the latter's ASMedia SATA 6.0 Gbps controller and using a Realtek GbE instead of an Intel one. There is other things if you like every detail i recommend checking some professional reviews and doing your homework so to speak on each board some details can be found here http://www.custompcguide.net/the-differences-between-asus-z77-v-series-motherboards/ That article lacks one thing though. It's about the V-LX, this board has only 4+2 Power Phase compared to 12 Phase on the regular V
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