In your spring buyer’s guide, you wrote that adequate graphics chips will be more important than ever, but in the past you’ve advised that memory, or RAM, was key to speed and performance. Can you now get the same gains by buying or adding a better graphics chip? Or is RAM just as important as ever?

There are lots of things that can improve the performance of a PC or Mac. But adding memory still gives you more bang for the buck than any other, in my view. What I was saying last week is that the forthcoming Microsoft and Apple operating systems will be relying more on graphics chips to help take some of the load off the main processor and speed up certain tasks. Even so, a better graphics chip isn’t a substitute for more main memory. In fact, most moderately priced computers use so-called integrated graphics chips, which lack dedicated memory and share some of the computer’s main RAM. So having plenty of main memory is directly related to getting the most out of such graphics chips.

Can the iPhone be connected to desktop peripherals? I want to be able to plug my iPhone into a large monitor and printer.

There are already several apps, including one from Hewlett-Packard, that allow you to print photos wirelessly from an iPhone to a printer that’s connected to a Wi-Fi network. But, as far as I know, there is nothing on the market today that can connect an iPhone to an external monitor or keyboard, or to a printer for nonphoto printing. However, Apple has announced that the new 3.0 version of the iPhone operating system, due this summer, will enhance the ability of the iPhone to work with add-on hardware, either via cables or wirelessly. The company showed this off with medical devices, but it’s possible that some third party could make it work with monitors or printers or keyboards.

A recent article in the Journal reported that a person had installed the Mac operating system on a Windows laptop. Is this really possible and is it legal?

Apple doesn’t sell or license its Mac OS X operating system for use on non-Apple hardware. In fact, the company considers it illegal to install OS X on other brands of computers. Nor does it produce OS X drivers for non-Apple hardware features that are built into competitors’ computers. Nevertheless, some computer hobbyists have installed OS X on non-Apple hardware, and posted photos and videos online to prove it.

Even if you are willing to ignore the legal issues, this process, while not brain surgery, takes more skill than the average user possesses. And, in the end, some features of the computer may wind up disabled or require workarounds to function. For instance, on one such machine I saw, the speaker port didn’t work with the Mac OS.

• You can find Mossberg’s Mailbox, and my other columns, online free of charge at the new All Things Digital Web site, http://walt.allthingsd.com.

I plan to purchase a new laptop. My uses are primarily Internet searching and email. I don’t play videogames. The salespeople are pushing me to buy a fast processor. Will buying a faster processor improve my slow DSL connection?

Compared to your old computer, any new PC, even one with a midrange modern processor and graphics system, plus more modern network components inside, may well be faster at using the Internet. That’s because things like rendering Web pages will likely speed up, and the computer may be better able to take advantage of whatever DSL speed you have entering your home. But even the fastest processor won’t make your DSL connection itself fundamentally speedier. To achieve that, you’d need to pay for faster service from either your current provider or a competitor.

Will my Quicken finances run on a Mac? And how do I transfer, from a Dell PC, my 2007 Quicken data?

There is a version of Quicken for the Mac, and there is a way to export your data from the Windows version and import it into this Mac version. But, because the two programs are actually very different under the hood, this process can be laborious and too often goes wrong. So, for people switching to the Mac who are devoted to Quicken, I suggest installing Windows on your Mac, and continuing to use the Windows version of Quicken. If you’d rather perform the export instead, you can find the instructions at quicken.intuit.com. Click on “Support,” then on “2007 for Mac,” then search for the keyword “convert.”

You can find Mossberg’s Mailbox, and my other columns, online free of charge at the new All Things Digital Web site, http://walt.allthingsd.com.

I want to purchase an e-reader. Currently I use my Palm Tungsten, but the screen is rather small for reading books. I purchased the Amazon Kindle for my niece but I do not like the design of it. Are there any other e-readers on the market that have a full keyboard and can connect to the Internet?

A: There may be some obscure models that do, but the main competitor to the Kindle, Sony’s Reader, lacks a direct connection to the Internet. You have to purchase titles on a computer and then move them to the device. The Reader does have a keyboard, but it’s virtual, not physical.

I’m considering the new 13″ aluminum-body MacBook. I’m a nontech guy doing routine computing tasks. I own an iMac and I’m ready to add a laptop. The only downside to the new MacBook seems to be the absence of a FireWire port. Is that a deal killer?

I don’t believe so. At one time, FireWire (also called 1394 or iLink on some computers and peripheral devices) was much faster than USB, but now the two are about the same speed. At one time, plugging most camcorders, or many external hard disks, required FireWire. Now both types of devices typically use USB or offer both types of ports.

If you are a professional photographer, videographer or musician with a heavy investment in USB peripheral devices, then the lack of a FireWire port may make the new MacBook a non-starter. But for an average user, unless you have invested in FireWire-only peripherals, I don’t think its absence would matter at all. Besides, you still have your iMac, which includes FireWire.

• You can find Mossberg’s Mailbox, and my other columns, online free of charge at the new All Things Digital Web site, http://walt.allthingsd.com.

Should I install Microsoft’s “SP3″ upgrade to Windows XP? I hear opinions on both sides.

In general, I recommend this upgrade, officially called Service Pack 3, because it beefs up security, and that helps not only you, but all Windows users, to avoid the spread of malicious software. If your PC is more secure, it is less likely to be used as a source from which other PCs can be infected.

I have upgraded a couple of XP PCs to SP3 without any downside. However, like you, I have also heard from some users that the upgrade caused them problems.

As with any major operating-system upgrade, either outcome can occur, depending upon your computer’s particular configuration and condition. So, if you’re on the fence, consider your level of concern about security.

How do cellular data cards compare with fast cable modems in terms of Internet speed? Are these cards more secure than Wi-Fi?

In my experience, using and testing cellular data cards on various laptops, they typically deliver, in real day-to-day use, somewhere between 300 kilobits per second and 1.5 megabits per second. By contrast, a fast cable Internet service can actually deliver up to 16 mbps. So cable is much faster.

Your security question is much more complicated. Wi-Fi security can range from very poor to quite good. It depends on where and how you use Wi-Fi, how you or others have set up the wireless network, and how you have configured your own computer.

Accessing the Internet over a cellular network is a more controlled process, because the cellphone-network operator manages the transmission, and in most cases supplies and configures the software on your computer. So, it is likely to be safer than the worst Wi-Fi setups. But I would never suggest that cellular data card transmissions are invulnerable to hackers or criminals.

What’s the difference between file-based backup and image-based backup software? Why would I choose one over the other?

Image-based backup software copies an image of your entire hard-disk, including all the programs, settings and obscure files that you never see. While it can be used to recover individual files, in some cases, it is mainly designed to allow you to restore your entire hard disk in the event that you lose it all.

File-based backup software, which is more common among consumers, is typically designed to preserve a copy of only your personal data, the material you can’t re-purchase or re-install if your hard disk dies.

That includes word-processing files, spreadsheets, presentations, emails, contacts, calendar items, photos and other items you created. It also is often used to back up music and video files that would be time-consuming, or very expensive, to re-acquire. And in some cases, it can preserve settings and preferences, such as Web bookmarks.

Both types of backup generally begin with a time-consuming initial session, followed by shorter sessions to update the backup with incremental changes.

Many people choose file-based backup because it occupies less space, and is generally quicker and also less expensive. Image-based backup is for folks who are willing to spend the added money and time to be sure they can restore their whole computer, or clone its contents completely to another machine.

• You can find Mossberg’s Mailbox, and my other columns, online free of charge at the new All Things Digital Web site, http://walt.allthingsd.com.

Do you still recommend the Dell XPS One all-in-one computer that you favorably reviewed last December? I am not a techie at all but need to replace my 5-year-old Dell and was interested in an all-in-one.

Yes. In fact, I now own two of these Dell XPS Ones and use them as my Vista desktop computers, at home and in the office. I still believe, as I wrote in my review, that this Dell’s hardware is superior to that of the competing Apple iMac, though the Vista operating system is inferior to Apple’s. And the base XPS One now costs the same as the base iMac — $1,199 — instead of $300 more, as it did last year. So, if you want the Windows operating system, and like the look and convenience of an all-in-one desktop, I still favor the XPS One. You can find my review at tinyurl.com/2xw 6mv.

Will Apple’s new MacBooks and MacBook Pros run Windows directly without an intervening “virtual machine” program like Parallels or Fusion?

Yes. All Apple Macs running the current Leopard operating system, including the new laptops, come with the ability to directly run Windows XP or Vista. Using Apple’s built-in “Boot Camp” feature, you can start up the computer in Windows, instead of the Mac’s own operating system, which turns the Mac into a pure Windows machine, with no trace of the Mac operating system running. The upsides of this approach are maximum Windows speed, and compatibility with the most graphics-intensive Windows programs, including games. Note that, to run Windows on a Mac, you must obtain and install a fresh, boxed, full version of XP or Vista. Apple doesn’t supply Windows.

I have a Yahoo email account, and wonder if Yahoo allows receipt and storage of email directly via a computer email program, such as Outlook, or is it all Web storage? Can you do both?

Yes. Yahoo offers a “Plus” option, for $20 a year, that permits users to receive and store their Yahoo email using a locally installed, instead of Web-based, email program. This approach does work with Microsoft Office, as well as many other local email programs. And you can still use Yahoo’s Web-based email interface at the same time. The Plus option also includes other benefits, including the elimination of ads and a doubling of the size limit on individual messages, to 20 megabytes.

• You can find Mossberg’s Mailbox, and my other columns, online free of charge at the new All Things Digital Web site, http://walt.allthingsd.com.

Last week, when you wrote about the ChaCha cellphone search service, you didn’t say how they make money. Are they collecting phone numbers from customers so they can send spam text messages, or sell the numbers to others who will do so?

ChaCha allows you to ask any Web-searchable question, by speaking it or texting it over a mobile phone, and then it sends you the answer via text message. The company charges consumers nothing, but says it is hoping to make money by striking deals with cellphone carriers to incorporate the ChaCha service into their current 411 phone-number look-up services. Also, it hopes to eventually include ads in the text message answers it provides.

In addition to the message that includes the answer, ChaCha sends you a message saying it is working on your request and restating your question, so you can see if it understood you correctly. It also sends an introductory text message to first-time users and occasional tips on how to use the service. Scott Jones, ChaCha’s chief executive, asserts that “we do not spam” and “we never make phone numbers and/or email addresses available to others.” He said the company is updating its privacy policy to make that clearer.

We have DSL service. I use several Web-based applications, one of which is online backup, and my husband is concerned that they degrade his use of the Web, which includes creating Web sites. I contend that that is like saying turning on one light bulb is using too much electricity, that two people on one DSL line aren’t using up too much bandwidth. Who is right?

Every situation differs, depending on exactly which programs you are each using, how you have them set, whether you are using them simultaneously, and how fast your DSL connection is. However, in general, your husband is correct that it is possible for heavy Internet usage on one computer in a home to slow down Internet speeds on another.

This is especially true with something like online backup, because it relies on your DSL account’s upload speed, which is typically far slower than the download speed. If your online backup program is trying to push a bunch of files over a slow upload connection, while he is in another room trying to upload new versions of a Web site over the same narrow upload pipe, it could affect the speeds he gets. You might try coordinating or staggering those online activities that involve heavy uploading. Normal Web surfing or emailing shouldn’t require any such coordination.

I am thinking about purchasing a Dell (DELL) XPS One all-in-one desktop, but I have one question. Does the Dell’s built-in TV tuner require any extra attachments to watch TV right out of the box?

You can watch over-the-air stations and analog basic cable stations right out of the box, without added equipment. However, you may want to connect a small desktop antenna to improve reception, which is what I did when I tested this machine. To use the XPS One with digital or premium cable or satellite stations, you would have to connect it to a cable or satellite receiver, just as most people do with their TV sets. This requires the use of an adapter that comes with the machine.

• You can find Mossberg’s Mailbox, and my other columns, online for free at the new All Things Digital web site, http://walt.allthingsd.com.