The HP C7115a and C7115x print cartridges are both manufactured by Hewlett-Packard for use with the HP LaserJet 1220 printer-copier. The cartridges are made with the same technology, and the ink is of identical quality. The primary difference between the two cartridges is print capacity. The C7115X can print approximately 3500 pages, while the C7115a can print only 2500 pages.
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Page yield is the number of pages a cartridge should print. The advertised page yields of HP cartridges conform to the ISO/IEC 24711 standard, meaning you can compare an HP cartridge's page yield to the advertised page yield of another manufacturer's cartridge. According to HP, the C7115x can be expected to yield about 1,000 more pages than the C7115a.
Hewlett-Packard sold the C7115a for £46.70 and the C7115x for £59.1 on its website in December 2010. Thus, the cost to print one page using a C7115a was 2.87 cents, and the cost to print one page using the C7115x was 2.59 cents.
Because of the additional ink, the C7115x is heavier than the C7115a. The C7115x weighs 1.2 Kilogram while the C7115a weighs 1.03 Kilogram, according to the cartridges' specifications on HP's website.
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