adjusted trace-length to make sure all traces on the bridge have exactly the same length. A PC gaming magazine has done research with x-rays for comparing SLI bridges with their SLI HB successors and found adjusted signal lengths by planned Meandering of certain wires so that clock rates can go up from 400 MHz to 650 MHz and thus the data rates along with that. With the increased bus width a noticeable bandwidth increase should be expected. Tests with a GTX 1080 GPU-board model showed that the improvements in gaming performance is quite marginal. Other than that it was discovered or determined, that LED illuminated bridges (often back-side-illuminating some logo) will mainly result in a noticeable increased market price at a comparable base functionality. Caveats Not all motherboards with multiple PCI-Express x16 slots support SLI. On August 10, 2009 Nvidia announced that Intel and other leading motherboard manufacturers including ASUS, EVGA, Gigabyte and MSI have all licensed Nvidia SLI technology for inclusion on their Intel P55 Express Chipset-based motherboards designed for the upcoming Intel Core i7 and i5 processor in the LGA 1156 socket. Older motherboards using the P55's predecessors Intel P35 or Intel P45 do not support SLI. Recent motherboards as of October 2017 that support it are Intel's Z and X series chipsets (Z68, Z77, Z87, Z97, Z170, Z270, Z370, X79, X99 and X299) along with AMD's 990FX, X370 and X399 chipsets. Earlier chipsets, such as the Intel X58, could support 2-way SLI over 16 lane PCI-e. In order for motherboards of that generation to support more than two GPUs they were required to implement Nvidia nForce chipsets. In an SLI configuration, cards can be of mixed manufacturers, card model names, BIOS revisions or clock speeds. However, they must be of the same GPU series (e.g. 8600, 8800) and GPU model name (e.g. GT, GTS, GTX). There are rare exceptions for "mixed SLI" configurations on some cards that only have a matching core codename (e.g. G70, G73, G80, etc.), but this is otherwise not possible, and only happens when two matched cards differ only very slightly, an example being a differing amount of video memory, stream processors, or clockspeed. In this case, the slower/lesser card becomes dominant, and the other card matches. Another exception is the GTS 250, which can be paired with the 9800 GTX+, as the GTS 250 GPU is a rebadged 9800 GTX+ GPU. In