glycoaxyl :
I wanted to get some advice regarding an upgrade i'm considering for my current system.
I currently have a pentium D on a mobo with no ability to upgrade to core2 duo/quad. I was considering an upgrade to a core i5 on a 11156 mobo. Running windows 7, and I know there will be huge improvements in gaming, but how much of an improvement in day to day application use would I see? (web surfing, music, videos, multitasking and office applications)
Thanks in advanced
Modern games do hit the CPU pretty hard. A Pentium D, particularly one of the original 8xx Smithfields, is probably a bit marginal in many newer titles. Your "day to day" applications probably won't benefit much from a faster CPU:
1. Running Windows 7. Windows 7 will run fine on a Pentium D and you won't see a tremendous improvement in performance by getting a new CPU as the CPU isn't really stressed by just running the OS. The things you'd want to do to make the OS feel snappier is to give the machine plenty of RAM (4-8 GB) and to put the OS on an SSD instead of a mechanical hard drive.
2. Web surfing. This is generally a pretty undemanding task as smartphones with CPUs roughly as fast as Pentium IIs do fine with most Web surfing. The only things that a faster-than-a-smartphone CPU would help is if you like to surf horribly-coded "Web 2.0" sites full of a boatload of Flash applets and other garbage. But even that stuff generally runs fine on any CPU made in the past half-dozen years or so. You'd do better to get a faster Internet connection than to upgrade your CPU if your Web browsing is too slow.
3. Music. My old 500 MHz AMD K6-2 didn't have trouble playing back music, so neither should your much faster Pentium D. Your Pentium D shouldn't have much trouble encoding it, either.
4. Videos. Video playback should be no issue on a Pentium D, as long as you have a remotely modern GPU that offloads the codec decoding from the CPU. The video codec decoding is generally the hardest part of playing back video, and the stuff that remains after that doesn't take up a whole lot of CPU. The only things that may give your Pentium D trouble would be VC-1/H.264/MPEG-4, but that's only because most of the GPUs available in 2005-2006 when the Pentium Ds were sold don't offload processing for those codecs. A new $25-30 low-end GPU would fix that problem nicely, though.
5. Multitasking. This is a very nebulous term as it may involve anything from simply having a lot of programs open that take up very little CPU but with one in the foreground taking CPU time (like having 10 spreadsheets open at once, but only running calculations in one of them) to doing a lot of very CPU-intensive tasks at once (like encoding four videos at once.) The first example will run equally well on a dual-core as a quad-core CPU, while the latter could easily put the hurt on a dual-CPU quad or six-core server. I'd need to know more about what you are doing with the machine to tell you if going from a Pentium D to a new quad-core CPU would really help you all that much.
6. Office applications. These generally take very little CPU unless you are doing something goofy like try to use a spreadsheet program to do the work of an actual statistical program or are opening a ridiculous 200-slide 100+ MB slide show.