The HP/Compaq CQ Desktop CQ2020TW uses DDR2 DIMM PC2-6400 800MHz memory upgrades as listed in the detailed specifications below. All memory and other upgrades compatible with this system are listed on this page.

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Memory Type DDR2 DIMM PC2-6400 800MHz
Base Memory 1GB (Removable) or 2GB (Removable)
Upgrade Slots 1 Socket(s)
Maximum Memory 2GB
Maximum Module Size 2GB
CPU & Chipset Intel Atom / Intel 945GC
Bus Architecture USB 2.0/3.x Type-A
Notes Important: Systems based on Intel 945GC chipset operates memory at maximum supported speed of DDR2 533MHz. Systems based on Intel GM45 chipset operates memory at maximum supported speed of DDR2 800MHz.
Manufacturer Part Numbers
  • NC808AA
Part Number 54.5C7
800MHz 240pin CL7
Unavailable
$5.99
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Part Number 541C7
800MHz 240pin CL7
In Stock
$7.99
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Part Number 54.5C7H
800MHz 240pin CL7
Unavailable
$8.99
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Part Number 541C7H
800MHz 240pin CL7
In Stock
$12.99
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Part Number 542C6
800MHz 240pin CL6
In Stock
$15.99
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Part Number 542C7
800MHz 240pin CL7
In Stock
$15.99
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Part Number 542C6H
800MHz 240pin CL6
In Stock
$24.99
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Part Number 542C7H
800MHz 240pin CL7
In Stock
$24.99
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Part Number 54.2C7
800MHz 240pin CL7
In Stock
$46.99
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Part Number 54.2C7H
800MHz 240pin CL7
In Stock
$74.99
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Part Number 542C6
800MHz 240pin CL6
In Stock
$15.99
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Part Number 542C7
800MHz 240pin CL7
In Stock
$15.99
View Product
Part Number 542C6H
800MHz 240pin CL6
In Stock
$24.99
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Part Number 542C7H
800MHz 240pin CL7
In Stock
$24.99
View Product
Part Number 541C7
800MHz 240pin CL7
In Stock
$7.99
View Product
Part Number 541C7H
800MHz 240pin CL7
In Stock
$12.99
View Product
Part Number 54.5C7
800MHz 240pin CL7
Unavailable
$5.99
View Product
Part Number 54.5C7H
800MHz 240pin CL7
Unavailable
$8.99
View Product
Part Number 54.2C7
800MHz 240pin CL7
In Stock
$46.99
View Product
Part Number 54.2C7H
800MHz 240pin CL7
In Stock
$74.99
View Product

Upgrade References

The table below are references to other manufacturer part numbers which are specific to this device, have identical specifications to our components. This information is made available for your reference.
Part# Source References
KTH-XW4400C6/2G 2GB DDR2 PC2-6400 800MHz DIMM Kingston 542C6