Is this a practical external gpu setup?

[Thunderhuff]

Hi, my personal laptop I use is a Dell Inspiron 15 3521.  https://www.cnet.com/products/dell-inspiron-3521-15-6-pentium-2127u-4-gb-ram-500-gb-hdd-english-us/specs/

 

 I had just bought a Radeon r9 255 2gb gpu from a friend who didn't want it anymore for $20.  

 

I have no desktop that would work with this so because of that I would like to use my laptop to play my games but can't play many of my games without putting the quality on very low.  (Side question: would this gpu be able to work well with heavily modded minecraft?)

 

 Lets begin with my idea. So I've researched and found that I could use something like this mini PCIe to PCIe dock

 

https://www.amazon.com/gp/aw/d/B00Q4VMLF6/ref=mp_s_a_1_7?ie=UTF8&qid=1484023594&sr=8-7&pi=AC_SX236_SY340_QL65&keywords=mini+pcie+to+pcie+dock&dpPl=1&dpID=61l1ojAnNWL&ref=plSrch

 

to plug my graphics card into it then plug the mini PCIe cable into where my wifi module would plug into my laptop and could buy a wifi dongle to plug into a USB port so I still can connect to the internet.  

 

Except... having the ability to unplug the gpu easily and have portability with my laptop when I want to is important to me. Also I don't want a cord hanging out the side of my laptop, that would bother me.

 

So, I was wondering if could buy this mini PCIe to USB 3.0 adapter 

 

https://www.amazon.com/gp/aw/d/B010L2GMOY/ref=mp_s_a_1_1?ie=UTF8&qid=1484022658&sr=8-1&pi=AC_SX236_SY340_QL65&keywords=usb+3.0+to+mini+pcie&dpPl=1&dpID=419hpTh6wzL&ref=plSrch

 

and use that to plug the dock into then plug into one of my USB 3.0 ports. What I'm most concerned is if there are any bottle necks from using USB 3.0 or really anything wrong in this setup and feel free to leave suggestions!

 

Again it is really important that I have an easily unplugable cord or device to my laptop because I still do want the ability of portability.

 

More information that I would like to add is I have an old desktop from 2003 that doesn't have PCIe slots but I don't use it anymore so could I take out the 250 watt power supply and use that solely to power my graphics card?

 

Thanks in advance!

[SCHISCHKA]

for the usb; english is pretty bad in this

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Notice: *Not compatible with SATA MINI PCI-E SSD/PATA MINI PCI-E SSD and RAID MINI PCI-E SSD. 

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Question:

can you use this as a PCIe slot for your laptop to run an external gpu?

Answer:

no sorry. It is to connect a Msata ssd drive and make accessible through USB