need advice on video card replacement -- current is Nvidia GT 620

Here are pictures showing the video card (5.7 inch long) and the motherboard. The motherboard pic did not turn out too well, but there is one long slot which is where the video card goes and then three very short slots underneath that.

I say again -- some of the cards I am looking at are calling for PCI-express 3.0. Some say either 2.0 or 3.0.
If they do not say 2.0, but only 3.0 -- am I still good?

The card you quoted to me gives me some concerns WRT
a. "6-pin PCI-E power connector", don't know if I have that.
b. "dual slot" -- current card is in only one slot.

Here is a full side view of my computer.

I have continued to look at possible solutions for my noisy fan in my Nvidia gt620. In case anyone else is watching this thread, I can say that the actual part number for the fan is FY04010M12LNB, and that a web search turns up numerous sources for ordering the fan. Many of those sources are slow boat from China. A few are couple of weeks delivery. Prices from US$5-20.

One potential solution that web searches turned up is to apply oil to the bearings. Some web sites said that sewing machine oil was acceptable, others said to use an oil that was specially designed for this purpose. With this model the bearings are not directly accessible, but I was able to remove the fan and put in some sewing machine oil along the side. My first attempt at this worked for about 12 hours before the fan started making noise again. I have just done a second attempt, putting more oil in and the fan is quiet. The core temp had been running between 35C and 41C. Before the core temp went between 50C and 103C.

I am going to let the oiling try to do its thing for a while, but have decided to search for a reasonable replacement card. In a previous post, I was pointed to the EVGA 1060 series. I have also seen a EVGA 1050 that looks appealing -- and would like ask for opinion on the comparison between two such cards.
1. EVGA GeForce GTX 1050 Ti SC GAMING, 04G-P4-6253-KR, 4GB GDDR5, ACX 2.0 (Single Fan)
2. EVGA GeForce GTX 1060 GAMING, 03G-P4-6160-KR, 3GB GDDR5, ACX 2.0 (Single Fan)

Both cards look as if they would easily fit in the PCI-E slot I have.

power specs for 2 say 400 watt, 6-pin connector required. I don't know that I have that.
power specs for 1 say 300 watt, no mention of extra connectors needed.

card 1 had 4GB memory, versus 3GB memory for card 2
card 1 claims memory bandwidth of 112 GB/s, versus 192 GB/s for card 2.

Which is more important -- GB memory or GB/s band width?

Any other comments on the comparison will be appreciated.

ThrashZone said:

Hi,
I would not buy the 4gb card = single fan that did not have additional power
It would get all power from the mother board

What is the problem with getting all power from the mother board?

I already showed you your additional power connections you have and yes you do it is actually a spliced 2-6pin power plus you hav additional 5 pin molex you could use either one.

I now see what you were talking about. there is a set of yellow & black wires terminating in a pair of six pin connectors (3 over 3). So -- that would be the 6-pin connector the one card requires.

The other connector (molex?) looks like the type of connector that goes into a hard drive. A flat connector with a lot of copper connectors.

The 6Gig 1060's are more than I want to pay.

What about the question of which is more important, GB memory or GB/s band width?