Can someone explain the difference between ( PC4 33000) & ( PC4 25600) I don't understand RAM specs in general??

These are the speed rating of RAM. Higher numbers are better. You must check that whatever motherboard you're going to use is able to handle the speed of the ram. The manufacturer will list this on their website

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Main image of Patriot Viper RGB 16GB (2 x 8GB) 288-Pin PC RAM DDR4 4133 (PC4 33000) Desktop Memory Model PVR416G413C9K

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Patriot Viper RGB 16GB (2 x 8GB) 288-Pin PC RAM DDR4 4133 (PC4 33000) Desktop Memory Model PVR416G413C9K

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DDR4 4133 (PC4 33000)
Timing 19-21-21-41
CAS Latency CL19
Voltage 1.40V

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Overview

Specs

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Model
Brand	Patriot
Series	Viper RGB
Model	PVR416G413C9K

Details
Capacity	16GB (2 x 8GB)
Type	288-Pin PC RAM
Speed	DDR4 4133 (PC4 33000)
CAS Latency	CL19
Timing	19-21-21-41
Voltage	1.40V
ECC	No
Buffered/Registered	Unbuffered
BIOS/Performance Profile	Intel XMP 2.0
Color	Black
Heat Spreader	Aluminum
Features	Patriot's Viper RGB Series memory modules are designed with extreme performance. Built and tested for the latest Intel and AMD platforms. The bright RGB lighting brings a colorful dimension to any build and will take it to the next level. With a unique aluminum heatshield and aggressive design, the Viper RGB Series will look good in any build. The aluminum heatshield offers superior heat dissipation to ensure excellent performance, even when using demanding applications. The 5 RGB lighting zones are all fully customizable with our easy to use Viper RGB Software. The Viper RGB Series is suited with XMP 2.0 support for automatic overclocking and compatible with lead motherboard partners' RGB sync applications. The Viper RGB Series DRAM has the most competitive and aggressive specifications in the Patriot OC DRAM product lines and is available with either a white or black heatshield.
LED Color	RGB

Additional Information
First Listed on Newegg	January 25, 2019

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): Lifetime
Limited Warranty period (labor): Lifetime
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Return for refund within: 30 days

Return for replacement within: 30 days

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Manufacturer Contact Info

Manufacturer Product Page
Manufacturer Website
Support Phone: 1-800-800-9600
Support Website
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Patriot Viper RGB 16GB (2 x 8GB) 288-Pin PC RAM DDR4 4133 (PC4 33000) Desktop Memory Model PVR416G413C9K

Learn more about the Patriot Memory PVR416G413C9K

Customer Reviews of the Patriot Memory PVR416G413C9K

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16820225116

Patriot Viper RGB 16GB (2 x 8GB) 288-Pin PC RAM DDR4 4133 (PC4 33000) Desktop Memory Model PVR416G413C9K

Learn more about the Patriot Memory PVR416G413C9K

Customer Reviews of the Patriot Memory PVR416G413C9K

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info