The HP/Compaq Pro 3420 uses DDR3 SODIMM PC3-10600 1333MHz 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 DDR3 SODIMM PC3-10600 1333MHz
Base Memory 2 GB (Removable) or 3 GB (Removable) or 4 GB (Removable) or 8 GB (Removable)
Upgrade Slots 2 Sockets
Maximum Memory 4 GB using a 32-bit Operating System 8 GB using a 64-bit Operating System
Maximum Module Size 4GB
CPU & Chipset Intel Pentium Intel H61 Intel Core i3 Intel H61 Intel Celeron 1.6 GHz Intel H61
Bus Architecture SSD - SATA 3.5-inch; USB
Notes MODULES MUST BE ORDERED AND INSTALLED IN PAIRS for Dual Channel mode. If 4GB is installed, the recognized memory may be reduced to 3.5GB or less (depending on system configuration and memory allocation). Maximum configurations require a 64-bit operating system.
Part Number 72.5C9
1333MHz 204pin CL9
Call to Order
$10.99
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Part Number 721C9
1333MHz 204pin CL9
In Stock
$12.99
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Part Number 722C9
1333MHz 204pin CL9
In Stock
$15.99
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Part Number 72.5C9H
1333MHz 204pin CL9
Call to Order
$17.99
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Part Number 721C9H
1333MHz 204pin CL9
In Stock
$19.99
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Part Number 724C9
1333MHz 204pin CL9
In Stock
$21.99
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Part Number 721C9-2
1333MHz 204pin CL9
In Stock
$24.99
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Part Number 722C9H
1333MHz 204pin CL9
In Stock
$24.99
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Part Number 722C9-2
1333MHz 204pin CL9
In Stock
$30.99
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Part Number 724C9H
1333MHz 204pin CL9
In Stock
$34.99
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Part Number 721C9-2H
1333MHz 204pin CL9
In Stock
$39.99
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Part Number 724C9-2
1333MHz 204pin CL9
In Stock
$43.99
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Part Number 722C9-2H
1333MHz 204pin CL9
In Stock
$49.99
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Part Number 724C9-2H
1333MHz 204pin CL9
In Stock
$69.99
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Part Number 724C9-2
1333MHz 204pin CL9
In Stock
$43.99
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Part Number 724C9-2H
1333MHz 204pin CL9
In Stock
$69.99
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Part Number 724C9
1333MHz 204pin CL9
In Stock
$21.99
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Part Number 722C9-2
1333MHz 204pin CL9
In Stock
$30.99
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Part Number 724C9H
1333MHz 204pin CL9
In Stock
$34.99
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Part Number 722C9-2H
1333MHz 204pin CL9
In Stock
$49.99
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Part Number 722C9
1333MHz 204pin CL9
In Stock
$15.99
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Part Number 721C9-2
1333MHz 204pin CL9
In Stock
$24.99
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Part Number 722C9H
1333MHz 204pin CL9
In Stock
$24.99
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Part Number 721C9-2H
1333MHz 204pin CL9
In Stock
$39.99
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Part Number 721C9
1333MHz 204pin CL9
In Stock
$12.99
View Product
Part Number 721C9H
1333MHz 204pin CL9
In Stock
$19.99
View Product
Part Number 72.5C9
1333MHz 204pin CL9
Call to Order
$10.99
View Product
Part Number 72.5C9H
1333MHz 204pin CL9
Call to Order
$17.99
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-X3B/2G 2GB DDR3 PC3-10600 1333MHz SODIMM Kingston 722C9
KTH-X3BS/2G 2GB DDR3 PC3-10600 1333MHz SODIMM Kingston 722C9
KTH-X3B/4G 4GB DDR3 PC3-10600 1333MHz SODIMM Kingston 724C9