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RamCity guarantees 100% that all modules below are compatible with the HP/Compaq Pavilion a1399d Media Center PC

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Kingston 256MB 240-pin DIMM Speed: DDR2-533 / PC2-4200 Part No: KTH-XW4200AN/256 Stock: 2-3 Days Overnight Shipping from £3.99 Buy TWO and get the second one for only £33.53!	£38.99

Kingston 512MB 240-pin DIMM Speed: DDR2-533 / PC2-4200 Part No: KTH-XW4200AN/512 Stock: 27 avail, ship within 24 hrs Overnight Shipping from £3.99 Buy TWO and get the second one for only £26.65!	£30.99

Kingston 1GB 240-pin DIMM Speed: DDR2-533 / PC2-4200 Part No: KTH-XW4200AN/1G Stock: 101 avail, ship within 24 hrs Overnight Shipping from £3.99 Buy TWO and get the second one for only £33.53!	£38.99

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Q: How much is delivery and how long will it take?: See our Shipping Information Page for details.
Q: Will my system recognise the maximum RAM upgrade?: The maximum memory your OS will recognise (whether it be Windows, Mac OS, or Linux/Unix) depends on the version you are running. 32-bit operating systems (which most people use) will usually see (and utilise) somewhere between 3GB to 3.5GB, depending on the peripheral configuration and motherboard limitations. A 64-bit OS will recognise beyond 4GB. Read more.
Q: How much memory can my system handle?: The maximum memory capacity for your system is shown above on the right hand side of the page. In the future, software applications will make increasing demands on your system resources, particularly the amount of system memory they need to use. Adding the maximum amount of memory will improve the performance of your system now and extend the useful life of your computer in the future.
Q: Do I have to install memory in matching pairs?: In most cases the answer is no, you can install modules one at a time, and you can mix different module sizes in your computer. However, if your computer supports dual-channel memory mode, you should install in identical pairs for optimal performance. Check the comments above on the right hand side for more details.
Q: Why is Kingston memory better than other brands?: Since 1987, Kingston has been known for producing the highest quality memory products available. All Kingston memory modules must perform properly to ensure maximum performance. Therefore, Kingston has developed an industry leading quality process to ensure that Kingston memory delivers superior quality, performance, and 100% compatibility with the computing system the module is designed for. Read more.
Q: How do I install the memory upgrade?: Installing memory in your system is usually a simple process. We have static and video installation guides available.
Q: Will installing an upgrade from RamCity affect my warranty?: You can rest assured that adding third party memory to your system does NOT void your warranty. You should take precautions when opening the case of your computer though, so we recommend to always refer to your owners manual or follow one of our online installation guides when installing a memory upgrade. Read more.

Note: All UK orders ship direct from Lenham, Kent, and no VAT applies.