Re: Should i upgrade RAM? (from 4gb to 6gb)
With graphics, if you are using an integrated graphics through the mobo, it will then pull from your normal RAM to use as the graphical RAM. If you have a 3rd party video card installed on the mobo, the graphics should be pulled directly from the Graphic Card's RAM. So the answer to your question if you are just wanting to make sure you have enough RAM for gaming down the road, is to make sure that your video card has a solid capacity for the memory. I would recommend a 1GB graphics card (which it looks like your computer is already coming with). A even better investment for gaming would be to set up a Crossfire or SLI gaming system to host dual video cards for one monitor. The current mobo doesn't offer a 2nd PCIe slot to host the 2nd card. It would be in your interest if you could upgrade the mobo to do so if you are going to be a heavy gamer and plan to keep this rig for several years as your main gaming station.
Now upgrading RAM is always good in general, but really depends on what you will be doing. If you plan to run a couple programs in the background while playing your games it would be better to have more RAM. More RAM allows you to multi-task multiple programs without running into deadlocks. 4GB of RAM is perfect for the normal use of a computer.
PSU:OCZ 600W modular - Mobo:ASUS P8Z68-V PRO - Processor:Intel Core i7-2600K - CPU Coolant:ZALMAN CNPS11X Extreme - Memory:CORSAIR Vengeance 8GB DDR3 1866 - Hard Drive:4.0 TB Seagate Barracuda XT 7200 RPM SATA 6.0Gb/s - Video Card:NVIDIA GeForce 7950 GT 512mb - DVD Drives:Sony 18x DVD+/- DL Burner and Samsung 18x DVD+/- DL Burner - OS: Windows 7 Ultimate 64-bit