Apple Performa 635CD Desktop RAM Memory Upgrades

We guarantee that our RAM memory upgrades are 100% compatible with your Apple Performa 635CD Desktop.

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Performa 635CD For Illustration Purposes Only

Help Me Choose

Your system memory specification is listed below, most importantly your maximum memory capacity:

  • Maximum Memory Capacity: 36MB
  • Default Installed Memory: 4MB (Non-Removable)
  • Number of Slots: 1 Slot (1 Bank of 1)

Although it is physically possible to install more memory, this system will only recognize 36MB max

You should also determine how much memory you already have installed and in what configuration. These useful links should explain how to do this:

Although the memory can be installed one module at a time, the best performance comes from using matched pairs of modules.

Price Promise We monitor the prices of our competitors twice daily, giving you the peace of mind that our prices are the lowest online.

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60-Day Returns Policy

Not 100% happy with your order then return it to us under our No Quibble 60 Day Money Back Guarantee. 

Our 60-Day return policy gives you plenty of time to consider your purchase. You can return any item in its original condition within 60 days of the date of shipment for a refund or exchange. We will also provide you a Freepost label to return the memory which ensures that there is no cost to our customers.

Lifetime Warranty

Feel confident that your memory will last a lifetime. Our lifetime warranty guarantees that if your memory should ever fail we will replace or repair the product free of charge. Please note that the lifetime warranty refers only to memory modules and not flash memory or storage products. Please see the individual 'product details' for warranties specific to each product. For complete warranty details please see our Terms and Conditions 

Premium Brand Chips

Not all memory is the same. Our memory is manufactured using premium brand chips from manufacturers including Samsung, Elpida (NEC), Hynix (Hyundai), Micron and Hypertec. This ensures the highest level of reliability and compatability. You may be able to buy cheaper memory but you will not be able to buy the same quality of memory cheaper. 

Memory Installation Guides

Memory is one of the simplest upgrades that you can perform on your computer. To make it even easier our support team have created both installation videos and a written guide for you to follow. 

Should you have any issues with your installation please see our FAQ page or contact our support team via live chat or at 

Installation Guide Installation Guide


6715 Customers have written a Trustpilot review

Star rating

Extra Ram for my old Dell

Speedy well packed delivery and RAM working well...shall be ordering again from OFFTEK :)) ACE

By Tina Cain. On 9. Oct
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Good Quality Product & Service

Easy to purchase, shipped quickly and worked as expected

By Michael Dempsey. On 9. Oct
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Great to deal with.

Helpful and fast with advice on the correct type of memory needed for my mobile.

By John Woodhead. On 7. Oct
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