Hello, First off my specs: Early 2009, 13" Macbook (Core 2 Duo 2.0 GHz) With upgraded Western Digital HDD (7200 RPM) OSX: Snow Leopard (temporarily downgraded straight off the installation disc)* BootCamp: Windows XP Professional SP3 That said, I just ordered a pair of 2GB Corsair Memory Sticks to upgrade from 2GB to 4GB of RAM. Currently, XP runs pretty smoothly. I mainly use that partition for gaming. It runs my main game well; TF2 with an average of 55-75 frames. I'm limited to a lot of games however and canyourunit.com usually lists my 2GB RAM as being the main problem. I've previously tried out a Windows 7 Ultimate SP1 32-bit partition. The OS itself ran beautifully but just could not handle running any games. The performance loss was obvious, so I reverted back to an install of XP. With my 4GB of RAM coming in, I wanted to know: a) What kind of performance increase to expect in XP when gaming, if any? b) Would I have enough memory to run Win7 instead, or should I stick to XP? c) In OSX, would it be worth it to upgrade back up to Mavericks?* d) Any other expectations and/or experiences anyone has had with a RAM upgrade. *I installed my first XP partition while on Snow Leopard years back. I've installed each iteration of OSX that has come out since then. When I installed that Win7 partition, I was running Mavericks. When I decided to reinstall XP instead, I found out Mavericks' BootCamp Assistant only supports Win7 and up. Hence why I downgraded back to Snow Leopard, whose Assistant still supports XP. However, I've been enjoying how smooth S.Leopard runs and am wondering if I should stick to it or can afford to upgrade a bit? Oh and probably worth mentioning: While booted in OSX, I do creative work. I am studying web development, so I use most of Adobe's Suite (Photoshop, After Effects, etc), Sublime Text Editor, Final Cut Pro... just to name a few. Taxing programs on my memory. So I'm sure my OSX partition will benefit greatly from more RAM.