does this come with cables?

Yes the Apevia Captain550 comes with these cable connectors for your reference: 1 x 20/24pin Main Power, 1 x P8pin(P4+4pin), 1 x 6/8pin PCI-express, 12V, 3 x SATA, 3 x Peripheral, 1 x Floppy

does it fit hp 8300 tower ?

Hi, this power supply is a standard atx size which means that it will fit most standard size cases. If your HP 8300 is the MT(mini tower) size this will fit, if you have the sff (small form factor) size this will not work.

ASIN	B089PZCB7X
Best Sellers Rank	#322 in Computer Power Supplies
Brand	Apevia
Compatible Devices	Personal Computer
Connector Type	atx, floppy , pci-express, pci-express/, sata , sata/
Connector Type Used on Cable	atx,floppy,pci-express,pci-express/,sata,sata/
Cooling Method	Air
Current Rating	39 Amps
Customer Reviews	3.9 out of 5 stars 335 Reviews
Fan Size	120 Millimeters
Form Factor	ATX
Item Dimensions	5.9 x 5.5 x 3.4 inches
Item Height	3.4 inches
Manufacturer	Apevia Corp
Maximum Input Voltage	230 Volts (AC)
Minimum Input Voltage	115 Volts
Model Name	CAPTAIN550
Number of Fans	1
Output Wattage	550
System Bus Connector Type	8 Pin
UPC	810047130017
Warranty Description	1 Year
Wattage	550 watts

CAPTAIN550 ATX Power Supply with All Black Cables

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