There are 5,696 Dell Precision T5500 benchmarks on userbenchmark.com and it's easy to query them and see whether someone is running a specific config.*

There are 6 benchmarks running a Dell Precision T5500 and a GTX 1660 Super - looks to be 4 different machines.  Here's one of them.

Note compatibility can be video card manufacturer/model# specific - if a card is incompatible you'd need to try another one.

*To see if someone's running a specific graphics card/SSD/HD, etc. in your system:

1. Go to userbenchmark.com and search for your system from search area in upper-right corner.
2. Once your specific system is selected scroll down and click on "Best Build (Edit with custom PC builder)".
3. On left-hand side remove with gray "X" all of CPU, GPU, SSD and RAM - leaving only MBD (the motherboard/system model).
4. Then click desired tab ("GPU" in this case) and "Change Baseline [GPU or whatever]".
5. To see how many benchmarks have this criteria, click "Load baseline user benchmarks" in lower-left section of page. (If that button is not present, there are no benchmarks with your criteria.)
6. From the list of benchmarks, you can click and drill down to system specifics.

I have just fitted a Gigabyte GTX1660 super to T5500 and had no real issues. Used a Y-Adapter power cable to feed the 8 pin socket from the two 6-pin GPU power cables.

I had to remove the plastic moulding (Card retainer) to get the GPU to fit physically. The enclosed nvidia driver on CD worked fine though you will probably want to download latest. Peter

Does this mean I need to buy an adapter to make it fit into the slots? If I do, will I have problems with the compatibility?

Hi @swaylo,

You don't need an adapter for it to fit in the slots.  To plug in the secondary power connection, you need a dual 6-pin to 8-pin Y adapter.  https://www.amazon.com/PCIe-Adapter-Power-Cable-Graphics/dp/B085VQ94YJ/ref=mp_s_a_1_8?dchild=1&keywords=dual+6+pin+to+8+pin+y+adapter&qid=1607217935&s=aht&sr=1-8 

PCI-e 16x slot is 75w max which is why there's 8-pin power connection on the 120w card.  Anything over 75w comes direct from the PSU and not thru the MB.

So I have to buy this 6 to 8 pin adapter along with the GPU, or is it optional?

Also, I have DDR3 RAM and I'm not sure if that's OK to connect to the GPU, along with other things like the power supply. Intel Xeon processor and 64-bit should be fine but my main concern is the RAM. 

Much Thanks.

Indeed, you would need to buy the 'Y' adapter in addition to the GTX 1660.

DDR3 RAM is fine, though it's not said how much RAM you have.

It's also not said what exact CPU you have.  I normally like to check CPU and GPU for any potential bottleneck issues.

The 1st main concern with GPU's is will the PSU be enough.  Your 875w PSU is more than enough for the 120w 1660.

Remember stringmaker's post above.

Just recently read through this thread.

I'm wondering about connecting up the GTX 1660 Super 6GB.  It seems I have to connect it to the PSU using a Y Cable (Dual 6 Pin to 8 Pin Adapter)?  Amazon.com: Dual 6 Pin to 8 Pin PCIe Adapter Power Cable (GPU Video Graphics Card Power Cable) 9.5 I...

Currently, I have a StarTech 4 Port PCI Express SuperSpeed USB 3.0 Card Adapter w/ 4 Dedicated 5Gbps Channels - UASP - SATA / LP4 Power attached by a 4 Pin Cable.

Question 1   Given that the StarTech USB 3.0 Card is attached to power, is there a separate connector on the PSU to attach via the Y Cable to the GTX 1660?

Question 2   Will the PSU be able to safely power the StarTech USB 3.0 Card and the GTX 1660?

Question 3   I will be taking out the Nvidia Quadro 4000 and replacing it with the GTX 1660 Super 6GB.  Is there anything 'special' I need to look out for in the change over?

Question 4   As there are various versions of the GTX 1660 Super 6GB, is there a version that would best suit my system and to run Davinci Resolve 17?

Thanks in advance!

My Service Tag 

Current system...

Windows 10 Professional, 64 bit

Intel Xeon X5650 @ 2.67GHz and 2.66GHz (2 processors)

48 GB RAM

DirectX 11

M-Audio Delta 1010LT Sound Card

NVIDIA Quadro 4000 Graphics Card

Hi @Manach ,

I'm going to answer what I can here.

#1. If your PSU doesn't have a separate connector to plug in the Y adapter (or any adapter for that matter), use a connection that goes to the DVD drive.  You have a free connection if you only have 1 DVD drive.  If 2 DVD drives, unplug one, and use the adapters you need for.there to have both DVD drive and GPU plugged in.  If you can think of an adapter you need, chances are it's made already.  It might be what one of the posters above did.

#2. Yes.  It also only provides 5v.  https://www.google.com/search?q=usb+3.0+card+wattage&safe=active&client=ms-android-americamovil-us-revc&sxsrf=ALeKk02V8GvuIg51ruSNq0y2Q5PBwf8JIA%3A1621275404254&ei=DLOiYJH4DsWQtAaokYnoCg&oq=usb+3.0+card+watt&gs_lcp=ChNtb2JpbGUtZ3dzLXdpei1zZXJwEAEYADIFCCEQoAEyBQghEKABMggIIRAWEB0QHjoECAAQRzoECCMQJzoGCAAQFhAeOgUIABCGAzoCCAA6BwghEAoQoAFQ1QRYnh5g9CtoAHABeACAAccHiAG1E5IBCzAuMS4zLjIuNi0xmAEAoAEByAEIwAEB&sclient=mobile-gws-wiz-serp 

#3. No.  PC might detect new hardware and require restart.  May need to download driver unless GTX 1660 SUPER comes with one.

#4.  There might be slightly different versions of the GTX 1600 SUPER 6GB.  Make sure it's at least GDDR6.  Google your games' recommended requirements and remember to not go with minimum requirements.  Otherwise, you might be looking at lower frame rates or resolution depending on the game.

My question would be to certain, what did @stringmaker plug into for the Y adapter and is it handling the wattage OK.  Would my suggestion for plugging Y adapter in same rail as DVD drive handle the wattage OK.  120-75=45w; so I would hope so.

It looks like you should have enough space to have all of your cards plugged in.

Not owning every PC including the T5500, I answered the best I could.  Some Dell documentation doesn't tell me a heck of a lot.  So, as for others that may own a T5500, I don't mind if they chime in as well.

It doesn't hurt to look at your PSU label.  Amps x volts = watts.  For example 12v rail supplying 10a would = 120w.  Make sure there's more than 45w with the 12v rail you're plugging into.  I can't as easily pull up the T5500's at the moment.  I couldn't find in Tech Guide.  And if I Google label, I have to sort thru images to find one that isn't blurry.

Also, no posting service tags.  That's private info.

You're welcome! 

I was reviewing mine and stringmaker's post.  Also reviewed what I could with T5500's PSU, and the GTX 1660 SUPER.  You should review stringmaker's post(s) as well.  Some "plastic moulding (Card retainer)" had to be removed.

Upon further review:  The 1660 has one 8-pin connector.  So, if you're PSU has two 6-pin connectors, use the the dual 6-pin to single 8-pin adapter that was linked.  Power won't be an issue.  So please never mind what I said about plugging into the 12v connector that goes to DVD drive.

Usually not enough people answering over here.  So I answer where I can.