Windows 7 Ultimate x64 Intel Q9550 ATI radeon 5770 P5QPL-AM ASUS motherboard OCZ 8GB (2x 4GB) Platinum series RAM. pc2-6400 DDR2, 240 pin, non ecc, unbuffered I have installed 8GB ram into my computer. Both my BIOS and system properties state I can use all 8GB of it. However- even when I put my computer under huge strain, I've never seen it go higher that 30-31%. It idles on about %20, so that means when I put strain on it, it only ever goes up by %10! I have not set a limit in msconfig either. It's frustrating me why my computer isn't using all my ram. If anybody has any suggestions, let me know! Here's an example: I open Photoshop (64 bit version) with a huge canvas (A0), and went crazy with a large brush. I've allowed PS to use %75 of my memory. PS lags heavily, yet my ram will not budge higher than 30-31%. Here is a screenshot of it. The ram is the steady blue line. I assumed Photoshop would utilize the remaining RAM instead of slowing down dramatically. I upgraded my RAM so I could work with large resolutions without lag, however the lag is still heavy. Am I wrong to think Photoshop should be using the remaining RAM and stop lagging? I would be extremely thankful if anybody could share any thoughts/information. Thanks EDIT: Just re-phrasing, as I realized I might be a little unclear.. I set my memory usage in PS to use 75% of it, which is about 6GB. However, as I've said, Photoshop continues to lag with large canvases/brushes, and never uses more then approx. 2500 MB ram. That's my main concern. I assign a potention 6GB for photoshop to use, yet as shown in the pic, it never goes over 2500mb. I believe if there was a way to let photoshop REALLY use 6GB, it would stop lagging and run smoothly ^^' is this correct or am i misguided?