Please help! which one is better to upgrade if i can only do one at this certain time.
closed as off topic by Kyle, David, Xavierjazz, Breakthrough, studiohack♦ Jan 26 '13 at 1:05
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Please note that this is a very open-ended question, but I don't think you intended for this. Please read the FAQ to understand which types of questions should be asked here. Below is some help because I know you probably need help, but I think that if you read the FAQ and re-wrote your question, you may be able to have it appropriate for this site. Below is some help for you despite the unappropriated question for this site:
What utilization do you normally run at? If you normally run a litle high on one of the two, but not the other, this is which one I would upgrade first. Memory is typically pretty cheap though, depending on which type. If you are using newer stuff, a 4GB stick of RAM (i.e. DDR3 1600) is around $20. A CPU is going to run a a few times this, especially if you are going Intel.
Make sure that your montherboard is compatible with the new equipment, no matter which you choose to upgrade. You may need to upgrade your motherboard also. There are lots of great DIY deals on some sites (i.e. NewEgg, TigerDirect, etc) for upgrades, which usually include motherboard, CPU, memory, and possibly an SSD.
Here is a couple of points to consider:
Assuming that your motherboard is able to support a more powerful CPU and you have a 64bit OS, then the question becomes more of usage.
Depending on what you are trying to gain, you might not need to upgrade those components, but maybe go to a better GPU (Graphics Card) or harddrive (SSD, 10k rpm harddrive). Without knowing your computer specs, it would impossible to give you the best advice.