increase in graphics performance?

You will see a huge improvement. Of course this depends on the game you intend to play. If the games minimum requirement is around the same specs as the card, then expect alittle bit less performance since it is PCI.

But for average games. You should see atleast double the frames per second, and improved quality. I added a PCI card to an older machine and the 3Dmark score increased from 400 to 2700. Also I had a p4 2.53ghz with a cheap card in there, and just adding a better one went from 3.9k score to 12k. That is just an improvement over graphics card, which shows how important they are overall in gaming.

Going from onboard to PCI is even more of an improvement. Games you were getting 10-20 fps I would guess you should get 50-80 fps, if not more. Also, you will see more reflections, shaders, detail, textures, and you can increase the resolution.

PCI doesn't suck, it's just not as fast as the rest. If you get a nice PCI card, it will still perform very well. Also, the PCI card can go in another machine some day. Or a friends. PCI cards are the most fun to benchmark, because they go in any computer. =)

Overclocking is always fun too.

Ohhh you can definately overclock a dell. I can overclock anything. I tweak my bios whatever I can. Also clockgen for software FSB overclocks.

You can sometimes overclock memory timings. You can overclock your graphics card for sure. That will improve. Although overclocking can fry things. I even once messed up my bios, and had to mail for a replacement.

Nope, ram has not something to do with snap shots, you wont get any graphical performance develop what so ever. you ought to need a extra effective snap shots card to develop performance. to positioned it trouble-free, the in trouble-free terms component a snap shots card does is reveal the picture, and to do this it does the equation y=mx+c for each pixle, so for a 1080p video reveal, it is going to calculate y=mx+c 1920x1080 circumstances each few milliseconds counting on the pastime and so on. Ram on the different hand holds techniques, in different words projects which the cpu is to finish or is already appearing, as you will locate there is not any hyperlink between both what so ever.