Question 1

This cable does not have 4 prongs in the side correct? ive bought 2 vga cables thus far and ive never been able to have dual moniters

Accepted Answer

There are 3 distinct types of DVI connectors. The 3 types are DVI-D (Digital only single link & dual link), DVI-I (Digital & Analog single link & dual link), and DVI-A (Analog), which yields 5 total connector patterns. When you look at the pattern of the female DVI connector on your PC it will tell you what connector you require to connect and then you need to find a conversion cable that has the male equivalent for your needs. If you are still confused as to which connector you require, do a simple online search for "DVI connector types". This gives you a variety of results, but simply look at one of the diagrams given that explains the 5 patterns. Compare those 5 to your connector and then look for a conversion cable that has a matching male connector. 
If you get the incorrect cable it will either not work or may not even allow you to connect it.
And these cables may be 1-way only, which this one is. It coverts DVI-D 24+1 (Digital only Dual Link) to VGA only. It will not convert VGA to DVI.
And if I understand your question about the "4 prongs", no, this cable does not have them. The connectors with "4 prongs" are Analog type connectors. The 3 connector types with 4 prongs are either DVI-I (single link & dual link) or DVI-A.
Not sure if this is what you were asking about, but hope it helps explain what you need to look for.

Question 2

Do you connect the dvi to the monitor or pc or either or

Accepted Answer

DVI-D out from PC to VGA in on monitor.  It's an *active* adapter which means it has a built in circuit that converts the digital DVI-D signal from the graphics card to an analog signal for the VGA monitor input.  Back-feeding the circuit trying to convert analog VGA to Digital DVI may work I have never tried it.  But that's not what the circuit was designed for and don't cry if it doesn't work or you toast your GPU or monitor.  Older graphics cards that had DVI-I (with the extra 4 pins) passed an analog signal on those 4 extra pins so you could use a non-active adapter and go both ways with those.

Question 3

Will this allow my system to play in a 18-bit color palette? i'm currently using a dp cord and i can not play games that require 18-bit.

Accepted Answer

Sorry but I can't determine that unless I specifically try/test for that. I can only say I am happy with it.

Question 4

Will this convert vga output from computer to a dvi-d display?

Accepted Answer

No, it is 1-way only: DVI-D (dual link) to VGA.

ASIN	B07JYXYSSL
Best Sellers Rank	#13 in DVI Cables #25 in VGA Cables
Brand Name	BENFEI
Cable Type	VGA
Color	1 PACK
Compatible Devices	Monitor, PC, Television
Compatible Phone Models	audio
Connector Gender	Male-to-Male
Connector Type	VGA
Customer Package Type	FFP
Customer Reviews	4.6 4.6 out of 5 stars (4,053)
Data Transfer Rate	1.65 gigabits_per_second
Frequency	60 hertz
Global Trade Identification Number	06971785940369
Indoor Outdoor Usage	Indoor, Outdoor
Item Length	6 feet
Item Shape	Round
Item Weight	0.14 kg
Manufacturer	Benfei
Model	000215black
Model Name	DVI-D to VGA
Number of Items	1
Number of Pins	25
Other Special Features of the Product	Quad-shielded
Part Number	000215black
Recommended Uses For Product	Video
Specification Met	Hdtv
Unit Count	1 Count

BENFEI Active DVI-D to VGA, DVI-D 24+1 to VGA 6 Feet Cable Male to Male Gold-Plated Cord

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