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RamCity guarantees 100% that all modules below are compatible with the Dell Optiplex GX1 550 L/M/MT(PIII)

Micron 256MB 168-pin DIMM Speed: PC133 ? More info about Micron memory Part No: ACJ Stock in Sydney: 6 avail, ship within 24-48 hrs 4-6 Day Shipping to UK from £9.99 Buy TWO and get the second one for only £26.65!	£30.99

Kingston 256MB 168-pin DIMM Speed: PC100 ? More info about Kingston memory Part No: KTD-OPGX1N/256 Stock in Kent: 25 avail, ship within 24-48 hrs Overnight Shipping from £3.99 Buy TWO and get the second one for only £50.73!	£58.99

Kingston 256MB Speed: PC100 ? More info about Kingston memory Part No: KTD-OPGX1/256 Stock in Kent: 2-3 Days Overnight Shipping from £3.99 Buy TWO and get the second one for only £69.65!	£80.99

Micron 64MB Speed: PC100 ? More info about Micron memory Part No: AQU Stock in Sydney: 2-3 Days 4-6 Day Shipping to UK from £9.99 Buy TWO and get the second one for only £33.53!	£38.99

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Q: There are many different memory options for my system - which is the best?: Generally speaking, the larger the upgrade, the greater the potential system performance increase. So, a 2GB upgrade is better than a 1GB upgrade, which is better than a 512MB upgrade. Some systems also handle different memory speeds, such as DDR-333 and DDR-400, or DDR2-533 and DDR2-667. In most cases the modules with the higher number will provide better performance. Check the system specifications comments up on the top right hand side of this page, and read more about the different memory speeds and what they mean.
Q: What do the different memory speeds mean?: Read our FAQ page about the different memory speeds and what they mean.
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.