The T3600 has two 6 pin cables going from the PSU to the GPU right? And those cards require an 8 pin connector. So I guess you will need either a (good quality) two 6 pin to one 8 pin adapter, or maybe replace the cable with e.g. this one and just use the 8 pin on that. (not sure if Dell PSU uses standard pinout, so best get a cable made for Dell T3600).

Also make sure the GPU you want isn't too big for the case, some GPUs are just too big to fit inside the T3600 case.

As for which GPU to choose I have no idea

Hi and thank you for your response.

There are a couple of options which I think SHOULD fit OK at a squeeze. I suppose the issue that concerns me with the 2060s might be a potential bottleneck with the E5 1650 Cpu not allowing me to use the extra performance. I am a bit of a noob when it comes to gaming and gaming builds, in spite of building my own PC's since Celeron slot 1. ☺ Totally understand your point re the power cable, yes there are two available.

  I was hoping to find a post where these two cards had been used in a same or similar build before caning the wallet. I have spent days on YouTube / websites trying to weigh up pro's and cons, without coming up with much TBH

Here are a couple of my builds using v2 Xeons, I think you will find the 2060 Super to be a good pairing!

https://imgur.com/a/K7GNAdO

https://imgur.com/a/qTMH7fj

Many thanks Adam.

Hi Cole - I also have a T3600 running the same CPU and want a new graphics card. What did you end up using, and how did it work out? Thanks, Matt

I don't normally sign in to post things, but wanted to help.

I purchased a GTX 1660 Super.

First problem is the 6-pin power connector on the T3600 and the card requires an 8-pin power connector.  I was able to find on Amazon, a 6-pin female to 8-pin adapter.

Second problem, I've yet to solve is that the card is too big to close the case.  There's a big bracket on the case panel that is suppose to "hold" the previous video card in place.

I'm trying to determine the best way to make that work. Its a fairly heavy duty bracket, tin snips might work, but it would make things ugly, which isn't a big deal for me.

The card itself works and I was able to do some testing in Lumion (which I wasn't able to run previously with the original video card).

Good luck! 

I recently bought a T3600 on eBay for 60$ and it has the 425W psu and no dual 6 pin connectors. It has an 8 pin port on the power supply breakout board that is labeled "vga2". Is there any way to use this port? Also, I am going to upgrade the stock E5 1603 0 to a E5 2680. Will this work? Any suggestions for RELIABLE GPU power adapter cables? Any help is greatly appreciated. 

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@ADSMarcus​ Lay on towel take hammer Hit Hard that Bracket on the inside of the side panel is only Tack welded on and pop's right off with ease / I have 8 of these Dell T3600's all upgraded to E2690's 64gb 1600mhz running quad mode (Impressive) and 1080TI's and RX580's all work fine, the 1080TI can pull to much power from the 635 watt PSU on occasion and shut down system running stress tests - bout it ,  Raid 10 SSD's - the Drives the Raid 10 is the SlOW Part now the CPU and RAM is fine !!!