Computer monitor cables?

I was a manager for a server centre, so laugh. I am trying to replace a IIYAMA pro light monitor with an hmdi cable, yet the new monitor with a hmdi cable is much smaller.

The IIYAMA cable is split with a small gap, one group of pins in about twice the size of the smaller group. The GPU is a HD 5770, yet with only a single conector, the split group one, the new monitor has a much smaller connector, not far of a USB.

So if any one can help me, or tell me if there is a gender bender i can use, i would be very greatful, even if a little sheepish.

Thank you. CDR

PS, sorry about how this must look, im trying to use a tablet, yes TRYING is deffinetly the right word.