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HP 51A vs. HP 51X

When getting the HP 51 replacement cartridge, you have two choices. So, what are the main differences between the HP 51A and HP 51X?

You can find out in this comparison guide at Seeking Tech between the two black toner cartridges.

Quick Summary

When compared to the HP 51A Black Original LaserJet Toner Cartridge, the HP 51X High Yield Black Original LaserJet Toner Cartridge has a higher capacity as you can print approximately twice as many pages.

So, while the HP 51X is more expensive upfront, you will save more in the long run as you won’t need to replace it as often as the HP 51A.

The two versions of the 51 Black Original LaserJet Toner Cartridge have the same operating temperature range, storage temperature range, operating humidity range and storage humidity range.

The HP 51A is built with slightly more recycled content than the HP 51X, however.

If you are interested, you can purchase either of the two versions on Amazon with the following links:

HP 51A vs. HP 51X Comparison Chart

You can take a look at our comparison table for the A and X variants of the HP 51 below.

 HP 51A Black Original LaserJet Toner Cartridge (Q7551A)HP 51X High Yield Black Original LaserJet Toner Cartridge (Q7551X)
What’s in the BoxHP 51A Black Original LaserJet Toner Cartridge

Recycling Guide
HP 51X High Yield Black Original LaserJet Toner Cartridge

Recycling Guide
Package Dimensions15.28 in x 6.50 in x 9.61 in15.28 in x 6.50 in x 12.87 in
Package Weight4.19 lbs.5.07 lbs.
Print TechnologyLaserLaser
Compatible PrintersHP LaserJet P3005 Q7812A#ABA

HP LaserJet P3005d Q7813A#ABA

HP LaserJet P3005dn Q7815A#ABA

HP LaserJet P3005n Q7814A#ABA

HP LaserJet P3005x Q7816A#ABA
HP LaserJet P3005 Q7812A#ABA

HP LaserJet P3005d Q7813A#ABA

HP LaserJet P3005dn Q7815A#ABA

HP LaserJet P3005n Q7814A#ABA

HP LaserJet P3005x Q7816A#ABA
Page Yield for Black and WhiteAround 6,500 pagesAround 13,000 pages
Operating Temperature Range59°F to 89°F59°F to 89°F
Storage Temperature Range-4°F to 104°F-4°F to 104°F
Operating Humidity Range10% to 80% RH10% to 80% RH
Storage Humidity Range10% to 90% RH10% to 90% RH
Recycled Content in Cartridge25%23%
PricingCheck price on Amazon.Check price on Amazon.

What’s in the Box

The retail boxes for both products include a recycling guide in addition to the toner cartridge.

You can take a look at a breakdown of the content inside each box below.

HP 51A:

  • HP 51A Black Original LaserJet Toner Cartridge
  • Recycling Guide

HP 51X:

  • HP 51X High Yield Black Original LaserJet Toner Cartridge
  • Recycling Guide

Package Dimensions

The package of the HP 51X is longer in terms of height when compared to the HP 51A. The width and depth for the two retail boxes are the same.

You can check out the dimensions, which is displayed as Width x Depth x Height, below:

  • HP 51A Black Original LaserJet Toner Cartridge: 15.28 in x 6.50 in x 9.61 in
  • HP 51X High Yield Black Original LaserJet Toner Cartridge: 15.28 in x 6.50 in x 12.87 in

Package Weight

In terms of the package weight, the X version of the 51 toner cartridge is also heavier than the A version.

You can find the weight specification for both below:

  • HP 51A Black Original LaserJet Toner Cartridge: 4.19 lbs.
  • HP 51X High Yield Black Original LaserJet Toner Cartridge: 5.07 lbs.

Print Technology

The HP 51A and HP 51X both utilize the laser printing technology.

Compatible Printers

The HP 51A Black Original LaserJet Toner Cartridge and HP 51X High Yield Black Original LaserJet Toner Cartridge are compatible with the following printers:

  • HP LaserJet P3005 Q7812A#ABA
  • HP LaserJet P3005d Q7813A#ABA
  • HP LaserJet P3005dn Q7815A#ABA
  • HP LaserJet P3005n Q7814A#ABA
  • HP LaserJet P3005x Q7816A#ABA

Page Yield for Black and White

Page Yield is a statistic that measures the capacity of the HP 51 in terms of the number of pages a fully filled cartridge is capable of printing out before it needs a replacement.

According to internal testing done by HP, the HP 51X High Yield Black Original LaserJet Toner Cartridge should be able to print around 6,500 more pages when compared to the HP 51A Black Original LaserJet Toner Cartridge.

When you look at it from a percentage standpoint, the X variant has a 100% yield advantage when compared to the A variant.

The tests were done using the ISO/IEC 19752 method.

You can check out the page yield when it comes to black and white pages for both versions below:

  • HP 51A Black Original LaserJet Toner Cartridge: Around 6,500 pages
  • HP 51X High Yield Black Original LaserJet Toner Cartridge: Around 13,000 pages

Operating Temperature Range

The A and X versions of the 51 toner cartridge have the same recommended temperature range during operation at 59°F to 89°F.

Storage Temperature Range

The HP 51A and HP 51X also have the same recommended temperature range for storage at -4°F to 104°F.

Operating Humidity Range

Furthermore, the two versions of the HP 51 have identical recommend humidity ranges at 10% to 80% RH.

Storage Humidity Range

For non-operation, you can also store the A and X variant within a recommended humidity range of 10% to 90% RH.

Recycled Content in Cartridge

The is HP 51A is slightly more environmentally friendly when compared to the HP 51X as it is built with more recycled materials.

You can take a look at the percentage of recycled content below:

  • HP 51A Black Original LaserJet Toner Cartridge: 25%
  • HP 51X High Yield Black Original LaserJet Toner Cartridge: 23%

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