Just curious, toying with the idea of upgrading my XP1600+ and we have a couple 1800+'s at the shop. I know the brown is the original color. Both are AGOIA steppings however, rest of the marks look fairly similar in numbers. Looking for the best overclock of course. Currently running my (first gen.) AGKGA XP1600+ at 148fsb, would it even be worth going to a 1800? We also have a XP2100+ AROIA core, haven't found much evidence on the overclockability of the AROIA 2100's. Running a Gigabyte VTXE board with 5,7.5, and 10% vcore settings. Thoughts and experiences mucho appreciado.