upgrade

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Laptop Proc Upgrade

Ask the Doctor LogoI’m considering upgrading my laptop’s CPU but don’t know what to use as a replacement. My laptop is a Dell Latitude D820 with an Intel Core2 T5500. This CPU does not support virtualization, so I am looking to replace it with a CPU that does. How do I go about figuring out which CPUs go with my laptop motherboard? If I am going to void my (very expensive) warranty doing this, I want to be sure that I have the correct part.

—Anne Richley

Read the Doctor's advice for Anne after the jump.

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Videocard Overkill

Ask the Doctor LogoI have two older systems: an Asus A8V-VM board with an Athlon X2 4800+ at 2.5GHz, 4GB of OCZ Platinum DDR/400 RAM, and a GeForce 6200 in a PCI-E x16 slot; and an old OEM eMachines board with an Athlon X2 6000+ at 3.0GHz, 4GB of OCZ Platinum DDR2/800, and onboard GeForce 6100 graphics, with an empty PCI-E x8 slot.

I want to upgrade one of them with a Radeon 5000 series to hold me over until I can put together a Lynnfield system. My concern is that both of these boards only have a PCI-E 1.0a slot. Would I notice any real performance difference between the Radeon HD 5750 vs. the 5970? Or would I just be wasting my money on the higher-end card?

—Tim Brown

Read the Doctor's answer for Tim after the jump.

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'Upgrade' Is a Relative Term

Ask the Doctor LogoI have an Asus P5L-MX motherboard and have wanted to upgrade the CPU for some time. Right now, I have a single-core Intel Celeron D with a Prescott core. I’ve pretty much maxed out the overclocking possibilities (I’ve gone from a stock 2.66GHz clock to 3.47GHz) and now I want to replace it with something better.

I want to keep the motherboard, however, which slightly complicates matters. As I recall, multicore processors were just catching on around the time my mobo was made. The documentation says it can support dual-core CPUs, and it has an LGA775 socket. I’d like to know whether it can take a quad-core or higher CPU, and if so, which ones (or if not, which dual-core CPU)?

—Andrew Lambert

See the Doctor's answer for Andrew after the jump.